./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loop-invgen/seq-3.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 9ad7fb26 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/config/TaipanReach.xml -i ../../sv-benchmarks/c/loop-invgen/seq-3.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH --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 6c770a3141edeab927df0da4e8c2152e1fb2e87b0c43a352500a7e3d3cff4533 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-9ad7fb2 [2021-11-03 05:00:22,138 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-03 05:00:22,141 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-03 05:00:22,194 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-03 05:00:22,195 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-03 05:00:22,197 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-03 05:00:22,199 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-03 05:00:22,201 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-03 05:00:22,204 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-03 05:00:22,205 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-03 05:00:22,206 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-03 05:00:22,208 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-03 05:00:22,209 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-03 05:00:22,210 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-03 05:00:22,212 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-03 05:00:22,213 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-03 05:00:22,214 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-03 05:00:22,216 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-03 05:00:22,218 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-03 05:00:22,221 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-03 05:00:22,223 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-03 05:00:22,224 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-03 05:00:22,226 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-03 05:00:22,227 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-03 05:00:22,231 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-03 05:00:22,232 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-03 05:00:22,232 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-03 05:00:22,234 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-03 05:00:22,234 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-03 05:00:22,236 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-03 05:00:22,236 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-03 05:00:22,237 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-03 05:00:22,238 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-03 05:00:22,239 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-03 05:00:22,241 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-03 05:00:22,241 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-03 05:00:22,242 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-03 05:00:22,243 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-03 05:00:22,243 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-03 05:00:22,244 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-03 05:00:22,247 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-03 05:00:22,248 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-03 05:00:22,288 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-03 05:00:22,291 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-03 05:00:22,293 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-03 05:00:22,293 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-03 05:00:22,294 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-03 05:00:22,294 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-03 05:00:22,294 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-03 05:00:22,294 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-03 05:00:22,301 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-03 05:00:22,301 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-03 05:00:22,302 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-03 05:00:22,302 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-03 05:00:22,303 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-03 05:00:22,303 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-03 05:00:22,303 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2021-11-03 05:00:22,304 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-03 05:00:22,304 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-03 05:00:22,304 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-03 05:00:22,305 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-03 05:00:22,305 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-03 05:00:22,305 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-03 05:00:22,305 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-03 05:00:22,306 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-03 05:00:22,306 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-03 05:00:22,306 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-03 05:00:22,306 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-03 05:00:22,307 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-03 05:00:22,307 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-03 05:00:22,307 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-03 05:00:22,309 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-03 05:00:22,309 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-03 05:00:22,309 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-03 05:00:22,310 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-03 05:00:22,310 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-03 05:00:22,310 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-03 05:00:22,310 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-03 05:00:22,311 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-03 05:00:22,311 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-03 05:00:22,311 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-03 05:00:22,311 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_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 6c770a3141edeab927df0da4e8c2152e1fb2e87b0c43a352500a7e3d3cff4533 [2021-11-03 05:00:22,568 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-03 05:00:22,597 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-03 05:00:22,599 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-03 05:00:22,600 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-03 05:00:22,601 INFO L275 PluginConnector]: CDTParser initialized [2021-11-03 05:00:22,602 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/../../sv-benchmarks/c/loop-invgen/seq-3.i [2021-11-03 05:00:22,683 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/data/a3e0b4e6c/df942584dbe74870899ed4584084009a/FLAG0cb22b50f [2021-11-03 05:00:23,157 INFO L306 CDTParser]: Found 1 translation units. [2021-11-03 05:00:23,158 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/sv-benchmarks/c/loop-invgen/seq-3.i [2021-11-03 05:00:23,170 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/data/a3e0b4e6c/df942584dbe74870899ed4584084009a/FLAG0cb22b50f [2021-11-03 05:00:23,555 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/data/a3e0b4e6c/df942584dbe74870899ed4584084009a [2021-11-03 05:00:23,558 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-03 05:00:23,559 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-03 05:00:23,562 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-03 05:00:23,563 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-03 05:00:23,566 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-03 05:00:23,567 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.11 05:00:23" (1/1) ... [2021-11-03 05:00:23,568 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6d4ab910 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 05:00:23, skipping insertion in model container [2021-11-03 05:00:23,568 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.11 05:00:23" (1/1) ... [2021-11-03 05:00:23,580 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-03 05:00:23,595 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-03 05:00:23,756 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_13233e23-b386-409d-9537-0a2e1f962ca0/sv-benchmarks/c/loop-invgen/seq-3.i[893,906] [2021-11-03 05:00:23,773 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-03 05:00:23,782 INFO L203 MainTranslator]: Completed pre-run [2021-11-03 05:00:23,795 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_13233e23-b386-409d-9537-0a2e1f962ca0/sv-benchmarks/c/loop-invgen/seq-3.i[893,906] [2021-11-03 05:00:23,800 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-03 05:00:23,813 INFO L208 MainTranslator]: Completed translation [2021-11-03 05:00:23,814 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 05:00:23 WrapperNode [2021-11-03 05:00:23,814 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-03 05:00:23,815 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-03 05:00:23,815 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-03 05:00:23,815 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-03 05:00:23,823 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 05:00:23" (1/1) ... [2021-11-03 05:00:23,829 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 05:00:23" (1/1) ... [2021-11-03 05:00:23,847 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-03 05:00:23,847 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-03 05:00:23,848 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-03 05:00:23,848 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-03 05:00:23,856 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 05:00:23" (1/1) ... [2021-11-03 05:00:23,857 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 05:00:23" (1/1) ... [2021-11-03 05:00:23,858 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 05:00:23" (1/1) ... [2021-11-03 05:00:23,858 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 05:00:23" (1/1) ... [2021-11-03 05:00:23,862 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 05:00:23" (1/1) ... [2021-11-03 05:00:23,866 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 05:00:23" (1/1) ... [2021-11-03 05:00:23,867 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 05:00:23" (1/1) ... [2021-11-03 05:00:23,869 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-03 05:00:23,870 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-03 05:00:23,870 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-03 05:00:23,870 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-03 05:00:23,871 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 05:00:23" (1/1) ... [2021-11-03 05:00:23,878 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-03 05:00:23,893 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 05:00:23,907 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-03 05:00:23,914 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-03 05:00:23,947 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-03 05:00:23,948 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-03 05:00:23,948 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-03 05:00:23,948 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-03 05:00:24,189 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-03 05:00:24,189 INFO L299 CfgBuilder]: Removed 9 assume(true) statements. [2021-11-03 05:00:24,192 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.11 05:00:24 BoogieIcfgContainer [2021-11-03 05:00:24,192 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-03 05:00:24,209 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-03 05:00:24,210 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-03 05:00:24,213 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-03 05:00:24,213 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 03.11 05:00:23" (1/3) ... [2021-11-03 05:00:24,214 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3ade32de and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.11 05:00:24, skipping insertion in model container [2021-11-03 05:00:24,214 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 05:00:23" (2/3) ... [2021-11-03 05:00:24,215 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3ade32de and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.11 05:00:24, skipping insertion in model container [2021-11-03 05:00:24,215 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.11 05:00:24" (3/3) ... [2021-11-03 05:00:24,216 INFO L111 eAbstractionObserver]: Analyzing ICFG seq-3.i [2021-11-03 05:00:24,222 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-03 05:00:24,229 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-03 05:00:24,281 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-03 05:00:24,288 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 [2021-11-03 05:00:24,299 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-03 05:00:24,313 INFO L276 IsEmpty]: Start isEmpty. Operand has 12 states, 10 states have (on average 1.7) internal successors, (17), 11 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:00:24,317 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-03 05:00:24,318 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:00:24,318 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:00:24,319 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:00:24,324 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:00:24,324 INFO L85 PathProgramCache]: Analyzing trace with hash 388343819, now seen corresponding path program 1 times [2021-11-03 05:00:24,333 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:00:24,335 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1904458952] [2021-11-03 05:00:24,342 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:00:24,347 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:00:24,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:00:24,630 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:00:24,631 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:00:24,631 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1904458952] [2021-11-03 05:00:24,638 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1904458952] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-03 05:00:24,638 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-03 05:00:24,639 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-03 05:00:24,641 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [725284444] [2021-11-03 05:00:24,646 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-03 05:00:24,647 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:00:24,668 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-03 05:00:24,669 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-03 05:00:24,672 INFO L87 Difference]: Start difference. First operand has 12 states, 10 states have (on average 1.7) internal successors, (17), 11 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:00:24,783 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:00:24,784 INFO L93 Difference]: Finished difference Result 32 states and 42 transitions. [2021-11-03 05:00:24,784 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-03 05:00:24,785 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 0 states have call successors, (0), 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 8 [2021-11-03 05:00:24,786 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:00:24,791 INFO L225 Difference]: With dead ends: 32 [2021-11-03 05:00:24,792 INFO L226 Difference]: Without dead ends: 18 [2021-11-03 05:00:24,794 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-11-03 05:00:24,807 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2021-11-03 05:00:24,818 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 12. [2021-11-03 05:00:24,819 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12 states, 11 states have (on average 1.3636363636363635) internal successors, (15), 11 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) [2021-11-03 05:00:24,820 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 15 transitions. [2021-11-03 05:00:24,821 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 15 transitions. Word has length 8 [2021-11-03 05:00:24,822 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:00:24,822 INFO L470 AbstractCegarLoop]: Abstraction has 12 states and 15 transitions. [2021-11-03 05:00:24,822 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:00:24,822 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 15 transitions. [2021-11-03 05:00:24,823 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-11-03 05:00:24,823 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:00:24,823 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:00:24,823 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-03 05:00:24,824 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:00:24,825 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:00:24,825 INFO L85 PathProgramCache]: Analyzing trace with hash -877914225, now seen corresponding path program 1 times [2021-11-03 05:00:24,825 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:00:24,825 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1167415482] [2021-11-03 05:00:24,826 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:00:24,826 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:00:24,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:00:24,883 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:00:24,883 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:00:24,884 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1167415482] [2021-11-03 05:00:24,884 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1167415482] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 05:00:24,884 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1364710311] [2021-11-03 05:00:24,884 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:00:24,885 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:00:24,885 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 05:00:24,887 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 05:00:24,909 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-03 05:00:24,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:00:24,978 INFO L263 TraceCheckSpWp]: Trace formula consists of 56 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-03 05:00:24,982 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:00:25,105 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:00:25,105 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:00:25,213 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:00:25,213 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1364710311] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-03 05:00:25,214 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2021-11-03 05:00:25,214 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [4] total 6 [2021-11-03 05:00:25,215 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2074828845] [2021-11-03 05:00:25,215 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-03 05:00:25,216 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:00:25,216 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-03 05:00:25,217 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-11-03 05:00:25,217 INFO L87 Difference]: Start difference. First operand 12 states and 15 transitions. Second operand has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 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) [2021-11-03 05:00:25,289 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:00:25,289 INFO L93 Difference]: Finished difference Result 22 states and 25 transitions. [2021-11-03 05:00:25,290 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-03 05:00:25,291 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2021-11-03 05:00:25,291 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:00:25,292 INFO L225 Difference]: With dead ends: 22 [2021-11-03 05:00:25,292 INFO L226 Difference]: Without dead ends: 20 [2021-11-03 05:00:25,293 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=26, Invalid=46, Unknown=0, NotChecked=0, Total=72 [2021-11-03 05:00:25,293 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2021-11-03 05:00:25,296 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 14. [2021-11-03 05:00:25,296 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 13 states have (on average 1.3076923076923077) internal successors, (17), 13 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:00:25,296 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 17 transitions. [2021-11-03 05:00:25,297 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 17 transitions. Word has length 9 [2021-11-03 05:00:25,297 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:00:25,297 INFO L470 AbstractCegarLoop]: Abstraction has 14 states and 17 transitions. [2021-11-03 05:00:25,297 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 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) [2021-11-03 05:00:25,298 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 17 transitions. [2021-11-03 05:00:25,298 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-11-03 05:00:25,298 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:00:25,298 INFO L513 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:00:25,320 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2021-11-03 05:00:25,500 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2021-11-03 05:00:25,501 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:00:25,501 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:00:25,502 INFO L85 PathProgramCache]: Analyzing trace with hash -1881968511, now seen corresponding path program 1 times [2021-11-03 05:00:25,502 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:00:25,502 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [825751587] [2021-11-03 05:00:25,502 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:00:25,503 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:00:25,521 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:00:25,595 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:00:25,596 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:00:25,597 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [825751587] [2021-11-03 05:00:25,597 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [825751587] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 05:00:25,598 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1223795401] [2021-11-03 05:00:25,598 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:00:25,598 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:00:25,598 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 05:00:25,599 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 05:00:25,604 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-03 05:00:25,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:00:25,669 INFO L263 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-03 05:00:25,671 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:00:25,866 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:00:25,866 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:00:25,947 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:00:25,948 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1223795401] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 05:00:25,949 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1332592771] [2021-11-03 05:00:25,985 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-03 05:00:25,985 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 05:00:25,995 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 05:00:26,003 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 05:00:26,003 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 05:00:26,055 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:26,059 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:00:26,060 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:26,060 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 05:00:26,064 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:00:26,065 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:26,065 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 05:00:26,069 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 111 [2021-11-03 05:00:26,090 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_8|], 10=[|v_#valid_9|]} [2021-11-03 05:00:26,102 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:00:26,109 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 [2021-11-03 05:00:26,110 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:26,110 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:00:26,112 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:26,112 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:00:26,113 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 05:00:26,114 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:26,132 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:26,137 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:00:26,138 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:00:26,139 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:00:26,145 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:00:26,148 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 [2021-11-03 05:00:26,149 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:26,151 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:00:26,152 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:26,152 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:00:26,153 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 05:00:26,153 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:26,164 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:26,166 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:26,168 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 05:00:26,169 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 05:00:26,169 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:108, output treesize:93 [2021-11-03 05:00:26,207 INFO L180 QuantifierPusher]: treesize reduction 17, result has 86.9 percent of original size [2021-11-03 05:00:26,212 INFO L185 QuantifierPusher]: treesize reduction 5, result has 95.1 percent of original size 97 [2021-11-03 05:00:26,216 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:26,239 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:26,264 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:26,307 INFO L180 QuantifierPusher]: treesize reduction 12, result has 95.7 percent of original size [2021-11-03 05:00:26,322 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 267 [2021-11-03 05:00:26,329 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:26,381 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:26,383 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:26,384 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:26,386 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:26,388 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:26,398 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:26,406 INFO L180 QuantifierPusher]: treesize reduction 30, result has 67.0 percent of original size [2021-11-03 05:00:26,409 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 52 [2021-11-03 05:00:26,419 INFO L180 QuantifierPusher]: treesize reduction 31, result has 74.8 percent of original size [2021-11-03 05:00:26,424 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 90 [2021-11-03 05:00:26,427 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:26,439 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:26,440 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:26,441 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:26,443 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:26,448 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:26,458 INFO L180 QuantifierPusher]: treesize reduction 30, result has 74.1 percent of original size [2021-11-03 05:00:26,462 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 80 [2021-11-03 05:00:26,469 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 05:00:27,363 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 05:00:27,363 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 05:00:27,364 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 13 [2021-11-03 05:00:27,364 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2036266308] [2021-11-03 05:00:27,364 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-03 05:00:27,364 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:00:27,365 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-03 05:00:27,366 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=380, Unknown=0, NotChecked=0, Total=462 [2021-11-03 05:00:27,366 INFO L87 Difference]: Start difference. First operand 14 states and 17 transitions. Second operand has 14 states, 14 states have (on average 2.0) internal successors, (28), 13 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:00:27,531 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:00:27,531 INFO L93 Difference]: Finished difference Result 32 states and 37 transitions. [2021-11-03 05:00:27,531 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-03 05:00:27,532 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.0) internal successors, (28), 13 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2021-11-03 05:00:27,532 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:00:27,534 INFO L225 Difference]: With dead ends: 32 [2021-11-03 05:00:27,534 INFO L226 Difference]: Without dead ends: 23 [2021-11-03 05:00:27,538 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 149 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=119, Invalid=531, Unknown=0, NotChecked=0, Total=650 [2021-11-03 05:00:27,538 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-11-03 05:00:27,544 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 15. [2021-11-03 05:00:27,545 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 14 states have (on average 1.2857142857142858) internal successors, (18), 14 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) [2021-11-03 05:00:27,545 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 18 transitions. [2021-11-03 05:00:27,545 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 18 transitions. Word has length 12 [2021-11-03 05:00:27,546 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:00:27,546 INFO L470 AbstractCegarLoop]: Abstraction has 15 states and 18 transitions. [2021-11-03 05:00:27,547 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.0) internal successors, (28), 13 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:00:27,547 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 18 transitions. [2021-11-03 05:00:27,550 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-11-03 05:00:27,551 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:00:27,551 INFO L513 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:00:27,588 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-03 05:00:27,751 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:00:27,752 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:00:27,752 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:00:27,752 INFO L85 PathProgramCache]: Analyzing trace with hash 1334724370, now seen corresponding path program 1 times [2021-11-03 05:00:27,752 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:00:27,752 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [52954918] [2021-11-03 05:00:27,753 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:00:27,753 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:00:27,777 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:00:27,825 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:00:27,825 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:00:27,825 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [52954918] [2021-11-03 05:00:27,825 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [52954918] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 05:00:27,825 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1028089458] [2021-11-03 05:00:27,826 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:00:27,826 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:00:27,826 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 05:00:27,827 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 05:00:27,843 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-03 05:00:27,881 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:00:27,881 INFO L263 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-03 05:00:27,882 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:00:27,999 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:00:28,000 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:00:28,062 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:00:28,063 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1028089458] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 05:00:28,063 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [111179673] [2021-11-03 05:00:28,067 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-03 05:00:28,067 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 05:00:28,068 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 05:00:28,068 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 05:00:28,069 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 05:00:28,084 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:28,085 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:00:28,086 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:28,086 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 05:00:28,089 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:00:28,090 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:28,090 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 05:00:28,093 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 111 [2021-11-03 05:00:28,098 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_9|], 10=[|v_#valid_10|]} [2021-11-03 05:00:28,106 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:00:28,108 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 [2021-11-03 05:00:28,109 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:28,110 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:00:28,110 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:28,111 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:00:28,111 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 05:00:28,111 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:28,115 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:28,118 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:00:28,119 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:00:28,120 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:00:28,127 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:00:28,130 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 [2021-11-03 05:00:28,131 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:28,133 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:00:28,134 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:28,134 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:00:28,135 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 05:00:28,136 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:28,140 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:28,142 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:28,146 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 05:00:28,148 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 05:00:28,151 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:108, output treesize:93 [2021-11-03 05:00:28,160 INFO L180 QuantifierPusher]: treesize reduction 16, result has 87.0 percent of original size [2021-11-03 05:00:28,164 INFO L185 QuantifierPusher]: treesize reduction 5, result has 94.8 percent of original size 91 [2021-11-03 05:00:28,167 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:28,177 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:28,190 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:28,235 INFO L180 QuantifierPusher]: treesize reduction 6, result has 97.7 percent of original size [2021-11-03 05:00:28,249 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 249 [2021-11-03 05:00:28,253 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:28,307 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:28,308 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:28,310 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:28,311 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:28,312 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:28,323 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:28,331 INFO L180 QuantifierPusher]: treesize reduction 24, result has 70.7 percent of original size [2021-11-03 05:00:28,335 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 49 [2021-11-03 05:00:28,349 INFO L180 QuantifierPusher]: treesize reduction 26, result has 78.5 percent of original size [2021-11-03 05:00:28,356 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 90 [2021-11-03 05:00:28,358 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:28,371 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:28,373 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:28,375 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:28,376 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:28,381 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:28,396 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:28,402 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 138 [2021-11-03 05:00:28,406 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:28,423 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:28,425 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:28,426 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:28,428 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:28,430 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:28,431 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:28,431 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:28,436 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:28,443 INFO L180 QuantifierPusher]: treesize reduction 30, result has 74.1 percent of original size [2021-11-03 05:00:28,446 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 80 [2021-11-03 05:00:28,453 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 05:00:29,219 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 05:00:29,219 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 05:00:29,219 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 12 [2021-11-03 05:00:29,219 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [239646841] [2021-11-03 05:00:29,220 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-03 05:00:29,220 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:00:29,221 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-03 05:00:29,221 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=355, Unknown=0, NotChecked=0, Total=420 [2021-11-03 05:00:29,221 INFO L87 Difference]: Start difference. First operand 15 states and 18 transitions. Second operand has 13 states, 13 states have (on average 2.076923076923077) internal successors, (27), 12 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) [2021-11-03 05:00:29,333 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:00:29,333 INFO L93 Difference]: Finished difference Result 42 states and 49 transitions. [2021-11-03 05:00:29,335 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-03 05:00:29,335 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.076923076923077) internal successors, (27), 12 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 12 [2021-11-03 05:00:29,335 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:00:29,335 INFO L225 Difference]: With dead ends: 42 [2021-11-03 05:00:29,336 INFO L226 Difference]: Without dead ends: 33 [2021-11-03 05:00:29,336 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 123 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=101, Invalid=499, Unknown=0, NotChecked=0, Total=600 [2021-11-03 05:00:29,336 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2021-11-03 05:00:29,339 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 16. [2021-11-03 05:00:29,339 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 15 states have (on average 1.3333333333333333) internal successors, (20), 15 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:00:29,340 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 20 transitions. [2021-11-03 05:00:29,340 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 20 transitions. Word has length 12 [2021-11-03 05:00:29,340 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:00:29,340 INFO L470 AbstractCegarLoop]: Abstraction has 16 states and 20 transitions. [2021-11-03 05:00:29,340 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 2.076923076923077) internal successors, (27), 12 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) [2021-11-03 05:00:29,341 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 20 transitions. [2021-11-03 05:00:29,341 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-11-03 05:00:29,341 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:00:29,341 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:00:29,376 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-03 05:00:29,557 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2021-11-03 05:00:29,557 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:00:29,557 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:00:29,558 INFO L85 PathProgramCache]: Analyzing trace with hash -1261535739, now seen corresponding path program 2 times [2021-11-03 05:00:29,558 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:00:29,558 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [656991412] [2021-11-03 05:00:29,558 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:00:29,558 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:00:29,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:00:29,622 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:00:29,622 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:00:29,622 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [656991412] [2021-11-03 05:00:29,622 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [656991412] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 05:00:29,622 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [7707079] [2021-11-03 05:00:29,623 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-03 05:00:29,623 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:00:29,623 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 05:00:29,624 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 05:00:29,654 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-03 05:00:29,708 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-03 05:00:29,709 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 05:00:29,709 INFO L263 TraceCheckSpWp]: Trace formula consists of 71 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-03 05:00:29,710 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:00:29,764 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:00:29,764 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:00:29,818 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:00:29,818 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [7707079] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 05:00:29,818 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1842923555] [2021-11-03 05:00:29,821 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-03 05:00:29,821 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 05:00:29,821 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 05:00:29,822 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 05:00:29,822 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 05:00:29,827 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:29,828 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:00:29,828 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:29,829 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 05:00:29,829 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:00:29,830 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:29,830 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 05:00:29,832 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 111 [2021-11-03 05:00:29,834 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_10|], 10=[|v_#valid_11|]} [2021-11-03 05:00:29,840 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:00:29,841 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 [2021-11-03 05:00:29,842 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:29,842 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:00:29,843 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:29,843 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:00:29,843 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 05:00:29,844 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:29,847 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:29,850 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:00:29,851 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:00:29,852 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:00:29,856 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:00:29,857 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 [2021-11-03 05:00:29,858 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:29,860 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:00:29,860 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:29,861 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:00:29,861 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 05:00:29,861 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:29,864 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:29,866 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:29,867 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 05:00:29,867 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 05:00:29,868 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:108, output treesize:93 [2021-11-03 05:00:29,875 INFO L180 QuantifierPusher]: treesize reduction 17, result has 86.9 percent of original size [2021-11-03 05:00:29,878 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 108 [2021-11-03 05:00:29,881 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:29,890 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:29,900 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:29,922 INFO L180 QuantifierPusher]: treesize reduction 17, result has 94.1 percent of original size [2021-11-03 05:00:29,929 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 269 [2021-11-03 05:00:29,934 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:29,959 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:29,961 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:29,962 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:29,963 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:29,963 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:29,967 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:29,973 INFO L180 QuantifierPusher]: treesize reduction 30, result has 67.0 percent of original size [2021-11-03 05:00:29,975 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 52 [2021-11-03 05:00:29,990 INFO L180 QuantifierPusher]: treesize reduction 31, result has 74.8 percent of original size [2021-11-03 05:00:29,994 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 90 [2021-11-03 05:00:29,996 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:30,006 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:30,007 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:30,008 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:30,009 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:30,012 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:30,019 INFO L180 QuantifierPusher]: treesize reduction 30, result has 74.1 percent of original size [2021-11-03 05:00:30,022 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 80 [2021-11-03 05:00:30,028 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 05:00:30,723 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 05:00:30,723 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 05:00:30,723 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 7 [2021-11-03 05:00:30,723 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1499114945] [2021-11-03 05:00:30,724 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-03 05:00:30,724 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:00:30,724 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-03 05:00:30,725 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=186, Unknown=0, NotChecked=0, Total=240 [2021-11-03 05:00:30,725 INFO L87 Difference]: Start difference. First operand 16 states and 20 transitions. Second operand has 8 states, 8 states have (on average 2.5) internal successors, (20), 7 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) [2021-11-03 05:00:30,799 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:00:30,800 INFO L93 Difference]: Finished difference Result 27 states and 31 transitions. [2021-11-03 05:00:30,800 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-03 05:00:30,801 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.5) internal successors, (20), 7 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) Word has length 13 [2021-11-03 05:00:30,801 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:00:30,801 INFO L225 Difference]: With dead ends: 27 [2021-11-03 05:00:30,801 INFO L226 Difference]: Without dead ends: 25 [2021-11-03 05:00:30,802 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 27 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 80 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=85, Invalid=295, Unknown=0, NotChecked=0, Total=380 [2021-11-03 05:00:30,802 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2021-11-03 05:00:30,804 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 19. [2021-11-03 05:00:30,805 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 18 states have (on average 1.2777777777777777) internal successors, (23), 18 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) [2021-11-03 05:00:30,805 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 23 transitions. [2021-11-03 05:00:30,805 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 23 transitions. Word has length 13 [2021-11-03 05:00:30,805 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:00:30,806 INFO L470 AbstractCegarLoop]: Abstraction has 19 states and 23 transitions. [2021-11-03 05:00:30,806 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.5) internal successors, (20), 7 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) [2021-11-03 05:00:30,806 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 23 transitions. [2021-11-03 05:00:30,806 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-11-03 05:00:30,808 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:00:30,808 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:00:30,848 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-03 05:00:31,017 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable49 [2021-11-03 05:00:31,017 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:00:31,017 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:00:31,018 INFO L85 PathProgramCache]: Analyzing trace with hash -1442517429, now seen corresponding path program 3 times [2021-11-03 05:00:31,018 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:00:31,018 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2056884018] [2021-11-03 05:00:31,018 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:00:31,018 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:00:31,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:00:31,130 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 3 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:00:31,130 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:00:31,130 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2056884018] [2021-11-03 05:00:31,130 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2056884018] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 05:00:31,130 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1122232108] [2021-11-03 05:00:31,131 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-03 05:00:31,131 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:00:31,131 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 05:00:31,132 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 05:00:31,145 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-03 05:00:31,212 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-03 05:00:31,212 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 05:00:31,213 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-03 05:00:31,214 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:00:31,432 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 7 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:00:31,433 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:00:31,528 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 7 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:00:31,528 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1122232108] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 05:00:31,528 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [798087095] [2021-11-03 05:00:31,530 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-03 05:00:31,530 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 05:00:31,531 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 05:00:31,531 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 05:00:31,531 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 05:00:31,536 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:31,537 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:00:31,537 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:31,537 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 05:00:31,538 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:00:31,538 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:31,538 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 05:00:31,540 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 111 [2021-11-03 05:00:31,542 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_11|], 10=[|v_#valid_12|]} [2021-11-03 05:00:31,548 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:00:31,549 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 [2021-11-03 05:00:31,549 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:31,549 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:00:31,550 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:31,550 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:00:31,550 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 05:00:31,551 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:31,554 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:31,557 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:00:31,557 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:00:31,558 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:00:31,562 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:00:31,563 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 [2021-11-03 05:00:31,564 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:31,565 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:00:31,566 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:31,566 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:00:31,566 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 05:00:31,566 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:31,569 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:31,570 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:31,571 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 05:00:31,572 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 05:00:31,572 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:108, output treesize:93 [2021-11-03 05:00:31,579 INFO L180 QuantifierPusher]: treesize reduction 17, result has 86.9 percent of original size [2021-11-03 05:00:31,581 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 108 [2021-11-03 05:00:31,584 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:31,592 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:31,602 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:31,622 INFO L180 QuantifierPusher]: treesize reduction 17, result has 94.1 percent of original size [2021-11-03 05:00:31,627 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 269 [2021-11-03 05:00:31,632 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:31,656 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:31,657 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:31,658 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:31,659 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:31,659 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:31,663 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:31,668 INFO L180 QuantifierPusher]: treesize reduction 30, result has 67.0 percent of original size [2021-11-03 05:00:31,672 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 52 [2021-11-03 05:00:31,677 INFO L180 QuantifierPusher]: treesize reduction 31, result has 74.8 percent of original size [2021-11-03 05:00:31,680 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 87 [2021-11-03 05:00:31,682 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:31,690 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:31,691 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:31,692 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:31,693 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:31,696 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:31,703 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:31,708 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 138 [2021-11-03 05:00:31,711 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:31,722 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:31,723 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:31,724 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:31,725 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:31,726 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:31,726 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:31,727 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:31,731 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:31,736 INFO L180 QuantifierPusher]: treesize reduction 30, result has 74.1 percent of original size [2021-11-03 05:00:31,739 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 80 [2021-11-03 05:00:31,744 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 05:00:32,426 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 05:00:32,426 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 05:00:32,427 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 17 [2021-11-03 05:00:32,427 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1604424884] [2021-11-03 05:00:32,427 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-03 05:00:32,427 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:00:32,428 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-03 05:00:32,428 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=106, Invalid=544, Unknown=0, NotChecked=0, Total=650 [2021-11-03 05:00:32,428 INFO L87 Difference]: Start difference. First operand 19 states and 23 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 17 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) [2021-11-03 05:00:32,580 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:00:32,580 INFO L93 Difference]: Finished difference Result 44 states and 50 transitions. [2021-11-03 05:00:32,580 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-03 05:00:32,580 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 17 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) Word has length 16 [2021-11-03 05:00:32,581 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:00:32,581 INFO L225 Difference]: With dead ends: 44 [2021-11-03 05:00:32,581 INFO L226 Difference]: Without dead ends: 32 [2021-11-03 05:00:32,582 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 271 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=169, Invalid=823, Unknown=0, NotChecked=0, Total=992 [2021-11-03 05:00:32,582 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-11-03 05:00:32,585 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 20. [2021-11-03 05:00:32,586 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 19 states have (on average 1.263157894736842) internal successors, (24), 19 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:00:32,586 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 24 transitions. [2021-11-03 05:00:32,586 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 24 transitions. Word has length 16 [2021-11-03 05:00:32,586 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:00:32,586 INFO L470 AbstractCegarLoop]: Abstraction has 20 states and 24 transitions. [2021-11-03 05:00:32,587 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 17 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) [2021-11-03 05:00:32,587 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 24 transitions. [2021-11-03 05:00:32,587 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-11-03 05:00:32,587 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:00:32,587 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:00:32,614 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-03 05:00:32,805 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable68,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:00:32,805 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:00:32,805 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:00:32,806 INFO L85 PathProgramCache]: Analyzing trace with hash -866118564, now seen corresponding path program 1 times [2021-11-03 05:00:32,806 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:00:32,806 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1552740125] [2021-11-03 05:00:32,806 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:00:32,806 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:00:32,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:00:32,906 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:00:32,906 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:00:32,907 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1552740125] [2021-11-03 05:00:32,907 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1552740125] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 05:00:32,907 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1238668569] [2021-11-03 05:00:32,907 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:00:32,907 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:00:32,907 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 05:00:32,908 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 05:00:32,928 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-03 05:00:32,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:00:32,998 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-03 05:00:32,999 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:00:33,176 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 7 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:00:33,177 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:00:33,256 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 7 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:00:33,257 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1238668569] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 05:00:33,257 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [103468602] [2021-11-03 05:00:33,260 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-03 05:00:33,260 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 05:00:33,260 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 05:00:33,261 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 05:00:33,261 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 05:00:33,274 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:33,275 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:00:33,276 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:33,276 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 05:00:33,277 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:00:33,277 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:33,278 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 05:00:33,279 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 111 [2021-11-03 05:00:33,282 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_12|], 10=[|v_#valid_13|]} [2021-11-03 05:00:33,287 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:00:33,288 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 [2021-11-03 05:00:33,289 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:33,289 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:00:33,290 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:33,290 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:00:33,290 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 05:00:33,290 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:33,293 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:33,296 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:00:33,297 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:00:33,298 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:00:33,302 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:00:33,304 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2021-11-03 05:00:33,305 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:33,307 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:00:33,307 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:33,308 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:00:33,308 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 05:00:33,308 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:33,313 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:33,314 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:33,315 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 05:00:33,315 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 05:00:33,315 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:108, output treesize:93 [2021-11-03 05:00:33,321 INFO L180 QuantifierPusher]: treesize reduction 16, result has 87.0 percent of original size [2021-11-03 05:00:33,323 INFO L185 QuantifierPusher]: treesize reduction 7, result has 92.9 percent of original size 91 [2021-11-03 05:00:33,326 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:33,333 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:33,342 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:33,361 INFO L180 QuantifierPusher]: treesize reduction 6, result has 97.7 percent of original size [2021-11-03 05:00:33,368 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 249 [2021-11-03 05:00:33,372 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:33,395 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:33,396 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:33,397 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:33,398 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:33,399 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:33,402 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:33,406 INFO L180 QuantifierPusher]: treesize reduction 24, result has 70.7 percent of original size [2021-11-03 05:00:33,410 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 49 [2021-11-03 05:00:33,414 INFO L180 QuantifierPusher]: treesize reduction 25, result has 71.9 percent of original size [2021-11-03 05:00:33,418 INFO L185 QuantifierPusher]: treesize reduction 5, result has 90.6 percent of original size 48 [2021-11-03 05:00:33,420 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:33,439 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:33,445 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:33,475 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:33,478 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 120 [2021-11-03 05:00:33,480 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:33,504 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:33,505 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:33,506 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:33,507 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:33,507 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:33,510 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:33,515 INFO L180 QuantifierPusher]: treesize reduction 24, result has 71.8 percent of original size [2021-11-03 05:00:33,518 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 52 [2021-11-03 05:00:33,523 INFO L180 QuantifierPusher]: treesize reduction 25, result has 78.6 percent of original size [2021-11-03 05:00:33,526 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 87 [2021-11-03 05:00:33,528 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:33,537 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:33,540 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:33,541 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:33,542 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:33,544 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:33,551 INFO L180 QuantifierPusher]: treesize reduction 24, result has 78.2 percent of original size [2021-11-03 05:00:33,554 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 80 [2021-11-03 05:00:33,559 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 05:00:34,232 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 05:00:34,232 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 05:00:34,233 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 16 [2021-11-03 05:00:34,233 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [557756970] [2021-11-03 05:00:34,233 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-03 05:00:34,233 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:00:34,234 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-03 05:00:34,234 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=513, Unknown=0, NotChecked=0, Total=600 [2021-11-03 05:00:34,234 INFO L87 Difference]: Start difference. First operand 20 states and 24 transitions. Second operand has 17 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 16 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) [2021-11-03 05:00:34,430 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:00:34,431 INFO L93 Difference]: Finished difference Result 56 states and 63 transitions. [2021-11-03 05:00:34,431 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-03 05:00:34,431 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 16 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) Word has length 16 [2021-11-03 05:00:34,431 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:00:34,432 INFO L225 Difference]: With dead ends: 56 [2021-11-03 05:00:34,433 INFO L226 Difference]: Without dead ends: 44 [2021-11-03 05:00:34,433 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 258 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=154, Invalid=838, Unknown=0, NotChecked=0, Total=992 [2021-11-03 05:00:34,434 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2021-11-03 05:00:34,443 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 20. [2021-11-03 05:00:34,443 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 19 states have (on average 1.263157894736842) internal successors, (24), 19 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:00:34,444 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 24 transitions. [2021-11-03 05:00:34,444 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 24 transitions. Word has length 16 [2021-11-03 05:00:34,444 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:00:34,444 INFO L470 AbstractCegarLoop]: Abstraction has 20 states and 24 transitions. [2021-11-03 05:00:34,444 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 16 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) [2021-11-03 05:00:34,444 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 24 transitions. [2021-11-03 05:00:34,445 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-11-03 05:00:34,445 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:00:34,445 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:00:34,484 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-03 05:00:34,673 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable96 [2021-11-03 05:00:34,673 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:00:34,673 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:00:34,673 INFO L85 PathProgramCache]: Analyzing trace with hash -1678809045, now seen corresponding path program 2 times [2021-11-03 05:00:34,674 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:00:34,674 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [412330608] [2021-11-03 05:00:34,674 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:00:34,674 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:00:34,700 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:00:34,760 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 3 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:00:34,760 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:00:34,760 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [412330608] [2021-11-03 05:00:34,760 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [412330608] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 05:00:34,760 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [591012845] [2021-11-03 05:00:34,760 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-03 05:00:34,761 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:00:34,761 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 05:00:34,762 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 05:00:34,770 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-03 05:00:34,867 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-03 05:00:34,868 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 05:00:34,868 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-03 05:00:34,869 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:00:35,023 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 7 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:00:35,024 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:00:35,098 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 7 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:00:35,098 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [591012845] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 05:00:35,098 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1504054374] [2021-11-03 05:00:35,104 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-03 05:00:35,104 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 05:00:35,104 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 05:00:35,105 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 05:00:35,105 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 05:00:35,109 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:35,110 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:00:35,110 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:35,111 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 05:00:35,111 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:00:35,112 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:35,112 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 05:00:35,113 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 111 [2021-11-03 05:00:35,120 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_13|], 10=[|v_#valid_14|]} [2021-11-03 05:00:35,126 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:00:35,127 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 [2021-11-03 05:00:35,128 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:35,128 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:00:35,128 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:35,129 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:00:35,129 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 05:00:35,129 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:35,133 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:35,136 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:00:35,136 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:00:35,137 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:00:35,141 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:00:35,142 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 [2021-11-03 05:00:35,143 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:35,144 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:00:35,145 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:35,145 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:00:35,145 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 05:00:35,146 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:35,149 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:35,150 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:35,151 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 05:00:35,152 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 05:00:35,152 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:108, output treesize:93 [2021-11-03 05:00:35,167 INFO L180 QuantifierPusher]: treesize reduction 16, result has 87.0 percent of original size [2021-11-03 05:00:35,170 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 102 [2021-11-03 05:00:35,172 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:35,181 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:35,191 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:35,212 INFO L180 QuantifierPusher]: treesize reduction 6, result has 97.7 percent of original size [2021-11-03 05:00:35,217 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 251 [2021-11-03 05:00:35,221 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:35,247 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:35,248 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:35,249 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:35,249 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:35,250 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:35,253 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:35,258 INFO L180 QuantifierPusher]: treesize reduction 24, result has 70.7 percent of original size [2021-11-03 05:00:35,263 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 49 [2021-11-03 05:00:35,270 INFO L180 QuantifierPusher]: treesize reduction 26, result has 78.5 percent of original size [2021-11-03 05:00:35,272 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 05:00:35,275 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:35,284 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:35,285 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:35,286 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:35,287 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:35,290 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:35,297 INFO L180 QuantifierPusher]: treesize reduction 30, result has 74.1 percent of original size [2021-11-03 05:00:35,299 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 80 [2021-11-03 05:00:35,305 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 05:00:35,997 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 05:00:35,997 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 05:00:35,998 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 15 [2021-11-03 05:00:35,998 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1685882528] [2021-11-03 05:00:36,001 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-03 05:00:36,001 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:00:36,001 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-03 05:00:36,002 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=469, Unknown=0, NotChecked=0, Total=552 [2021-11-03 05:00:36,004 INFO L87 Difference]: Start difference. First operand 20 states and 24 transitions. Second operand has 16 states, 16 states have (on average 2.125) internal successors, (34), 15 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) [2021-11-03 05:00:36,159 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:00:36,159 INFO L93 Difference]: Finished difference Result 69 states and 78 transitions. [2021-11-03 05:00:36,159 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-03 05:00:36,159 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.125) internal successors, (34), 15 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 16 [2021-11-03 05:00:36,159 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:00:36,160 INFO L225 Difference]: With dead ends: 69 [2021-11-03 05:00:36,160 INFO L226 Difference]: Without dead ends: 57 [2021-11-03 05:00:36,160 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 206 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=143, Invalid=727, Unknown=0, NotChecked=0, Total=870 [2021-11-03 05:00:36,161 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2021-11-03 05:00:36,169 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 21. [2021-11-03 05:00:36,171 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 20 states have (on average 1.3) internal successors, (26), 20 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) [2021-11-03 05:00:36,172 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 26 transitions. [2021-11-03 05:00:36,172 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 26 transitions. Word has length 16 [2021-11-03 05:00:36,173 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:00:36,173 INFO L470 AbstractCegarLoop]: Abstraction has 21 states and 26 transitions. [2021-11-03 05:00:36,173 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 2.125) internal successors, (34), 15 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) [2021-11-03 05:00:36,173 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 26 transitions. [2021-11-03 05:00:36,174 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-11-03 05:00:36,174 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:00:36,174 INFO L513 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:00:36,210 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-03 05:00:36,393 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable125 [2021-11-03 05:00:36,393 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:00:36,394 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:00:36,394 INFO L85 PathProgramCache]: Analyzing trace with hash -1745511985, now seen corresponding path program 4 times [2021-11-03 05:00:36,394 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:00:36,394 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1328568876] [2021-11-03 05:00:36,394 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:00:36,395 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:00:36,405 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:00:36,464 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 3 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:00:36,464 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:00:36,464 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1328568876] [2021-11-03 05:00:36,464 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1328568876] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 05:00:36,464 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1462702098] [2021-11-03 05:00:36,465 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-03 05:00:36,465 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:00:36,465 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 05:00:36,466 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 05:00:36,473 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-03 05:00:36,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:00:36,598 INFO L263 TraceCheckSpWp]: Trace formula consists of 86 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-03 05:00:36,599 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:00:36,656 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 6 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:00:36,656 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:00:36,745 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 6 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:00:36,745 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1462702098] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 05:00:36,745 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1519185068] [2021-11-03 05:00:36,748 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-03 05:00:36,748 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 05:00:36,753 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 05:00:36,753 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 05:00:36,753 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 05:00:36,758 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:36,759 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:00:36,759 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:36,760 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 05:00:36,769 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:00:36,769 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:36,769 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 05:00:36,771 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 111 [2021-11-03 05:00:36,774 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_14|], 10=[|v_#valid_15|]} [2021-11-03 05:00:36,779 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:00:36,780 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 [2021-11-03 05:00:36,780 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:36,781 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:00:36,781 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:36,781 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:00:36,782 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 05:00:36,782 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:36,785 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:36,788 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:00:36,789 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:00:36,790 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:00:36,793 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:00:36,794 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 [2021-11-03 05:00:36,795 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:36,796 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:00:36,797 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:36,798 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:00:36,798 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 05:00:36,798 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:36,801 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:36,802 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:36,803 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 05:00:36,803 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 05:00:36,804 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:108, output treesize:93 [2021-11-03 05:00:36,810 INFO L180 QuantifierPusher]: treesize reduction 17, result has 86.9 percent of original size [2021-11-03 05:00:36,812 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 106 [2021-11-03 05:00:36,815 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:36,825 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:36,834 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:36,856 INFO L180 QuantifierPusher]: treesize reduction 12, result has 95.7 percent of original size [2021-11-03 05:00:36,862 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 269 [2021-11-03 05:00:36,866 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:36,898 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:36,899 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:36,901 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:36,902 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:36,903 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:36,906 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:36,913 INFO L180 QuantifierPusher]: treesize reduction 30, result has 67.0 percent of original size [2021-11-03 05:00:36,915 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 52 [2021-11-03 05:00:36,923 INFO L180 QuantifierPusher]: treesize reduction 31, result has 74.8 percent of original size [2021-11-03 05:00:36,926 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 87 [2021-11-03 05:00:36,928 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:36,936 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:36,937 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:36,938 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:36,939 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:36,942 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:36,950 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:36,954 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 138 [2021-11-03 05:00:36,956 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:36,970 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:36,971 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:36,972 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:36,973 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:36,974 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:36,975 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:36,976 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:36,982 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:36,992 INFO L180 QuantifierPusher]: treesize reduction 30, result has 74.1 percent of original size [2021-11-03 05:00:36,995 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 80 [2021-11-03 05:00:37,002 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 05:00:37,734 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 05:00:37,734 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 05:00:37,734 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 8 [2021-11-03 05:00:37,739 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [125954097] [2021-11-03 05:00:37,740 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-03 05:00:37,740 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:00:37,741 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-03 05:00:37,741 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=213, Unknown=0, NotChecked=0, Total=272 [2021-11-03 05:00:37,741 INFO L87 Difference]: Start difference. First operand 21 states and 26 transitions. Second operand has 9 states, 9 states have (on average 2.6666666666666665) internal successors, (24), 8 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) [2021-11-03 05:00:37,827 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:00:37,828 INFO L93 Difference]: Finished difference Result 32 states and 37 transitions. [2021-11-03 05:00:37,828 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-03 05:00:37,828 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.6666666666666665) internal successors, (24), 8 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) Word has length 17 [2021-11-03 05:00:37,828 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:00:37,829 INFO L225 Difference]: With dead ends: 32 [2021-11-03 05:00:37,829 INFO L226 Difference]: Without dead ends: 30 [2021-11-03 05:00:37,829 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 40 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 106 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=102, Invalid=360, Unknown=0, NotChecked=0, Total=462 [2021-11-03 05:00:37,829 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-11-03 05:00:37,833 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 24. [2021-11-03 05:00:37,833 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 23 states have (on average 1.2608695652173914) internal successors, (29), 23 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:00:37,834 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 29 transitions. [2021-11-03 05:00:37,834 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 29 transitions. Word has length 17 [2021-11-03 05:00:37,834 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:00:37,834 INFO L470 AbstractCegarLoop]: Abstraction has 24 states and 29 transitions. [2021-11-03 05:00:37,835 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.6666666666666665) internal successors, (24), 8 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) [2021-11-03 05:00:37,835 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 29 transitions. [2021-11-03 05:00:37,835 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-03 05:00:37,835 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:00:37,836 INFO L513 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:00:37,868 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-03 05:00:38,061 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable144,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:00:38,061 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:00:38,061 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:00:38,061 INFO L85 PathProgramCache]: Analyzing trace with hash -1373649343, now seen corresponding path program 5 times [2021-11-03 05:00:38,062 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:00:38,062 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [913673567] [2021-11-03 05:00:38,062 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:00:38,062 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:00:38,079 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:00:38,186 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 8 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:00:38,186 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:00:38,187 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [913673567] [2021-11-03 05:00:38,187 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [913673567] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 05:00:38,187 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2025894886] [2021-11-03 05:00:38,187 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-03 05:00:38,187 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:00:38,188 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 05:00:38,193 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 05:00:38,211 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-03 05:00:38,340 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-03 05:00:38,340 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 05:00:38,341 INFO L263 TraceCheckSpWp]: Trace formula consists of 96 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-03 05:00:38,342 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:00:38,592 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 15 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:00:38,593 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:00:38,691 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 15 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:00:38,691 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2025894886] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 05:00:38,691 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [155344576] [2021-11-03 05:00:38,692 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-03 05:00:38,692 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 05:00:38,692 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 05:00:38,693 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 05:00:38,693 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 05:00:38,698 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:38,699 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:00:38,699 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:38,699 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 05:00:38,700 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:00:38,700 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:38,701 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 05:00:38,702 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 111 [2021-11-03 05:00:38,705 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_15|], 10=[|v_#valid_16|]} [2021-11-03 05:00:38,709 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:00:38,711 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 [2021-11-03 05:00:38,711 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:38,711 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:00:38,712 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:38,712 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:00:38,712 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 05:00:38,712 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:38,714 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:38,719 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:00:38,720 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:00:38,721 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:00:38,726 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:00:38,728 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 [2021-11-03 05:00:38,729 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:38,731 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:00:38,731 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:38,732 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:00:38,732 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 05:00:38,732 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:38,735 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:38,736 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:38,737 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 05:00:38,738 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 05:00:38,738 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:108, output treesize:93 [2021-11-03 05:00:38,745 INFO L180 QuantifierPusher]: treesize reduction 17, result has 86.9 percent of original size [2021-11-03 05:00:38,747 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 108 [2021-11-03 05:00:38,750 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:38,758 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:38,774 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:38,813 INFO L180 QuantifierPusher]: treesize reduction 17, result has 94.1 percent of original size [2021-11-03 05:00:38,818 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 269 [2021-11-03 05:00:38,823 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:38,848 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:38,850 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:38,851 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:38,851 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:38,852 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:38,856 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:38,860 INFO L180 QuantifierPusher]: treesize reduction 30, result has 67.0 percent of original size [2021-11-03 05:00:38,862 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 52 [2021-11-03 05:00:38,869 INFO L180 QuantifierPusher]: treesize reduction 31, result has 74.8 percent of original size [2021-11-03 05:00:38,871 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 87 [2021-11-03 05:00:38,873 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:38,880 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:38,881 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:38,882 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:38,883 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:38,886 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:38,893 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:38,896 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 138 [2021-11-03 05:00:38,898 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:38,909 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:38,910 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:38,911 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:38,912 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:38,912 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:38,913 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:38,914 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:38,920 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:38,925 INFO L180 QuantifierPusher]: treesize reduction 30, result has 74.1 percent of original size [2021-11-03 05:00:38,927 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 80 [2021-11-03 05:00:38,933 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 05:00:39,618 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 05:00:39,619 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 05:00:39,619 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 21 [2021-11-03 05:00:39,619 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [47606169] [2021-11-03 05:00:39,619 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-11-03 05:00:39,619 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:00:39,620 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-11-03 05:00:39,620 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=734, Unknown=0, NotChecked=0, Total=870 [2021-11-03 05:00:39,621 INFO L87 Difference]: Start difference. First operand 24 states and 29 transitions. Second operand has 22 states, 22 states have (on average 2.0) internal successors, (44), 21 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) [2021-11-03 05:00:39,832 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:00:39,833 INFO L93 Difference]: Finished difference Result 56 states and 63 transitions. [2021-11-03 05:00:39,833 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-03 05:00:39,833 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 21 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) Word has length 20 [2021-11-03 05:00:39,833 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:00:39,834 INFO L225 Difference]: With dead ends: 56 [2021-11-03 05:00:39,834 INFO L226 Difference]: Without dead ends: 41 [2021-11-03 05:00:39,835 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 416 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=231, Invalid=1175, Unknown=0, NotChecked=0, Total=1406 [2021-11-03 05:00:39,835 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2021-11-03 05:00:39,839 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 25. [2021-11-03 05:00:39,839 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 24 states have (on average 1.25) internal successors, (30), 24 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) [2021-11-03 05:00:39,840 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 30 transitions. [2021-11-03 05:00:39,840 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 30 transitions. Word has length 20 [2021-11-03 05:00:39,840 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:00:39,840 INFO L470 AbstractCegarLoop]: Abstraction has 25 states and 30 transitions. [2021-11-03 05:00:39,841 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 21 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) [2021-11-03 05:00:39,841 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 30 transitions. [2021-11-03 05:00:39,841 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-03 05:00:39,841 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:00:39,841 INFO L513 BasicCegarLoop]: trace histogram [4, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:00:39,875 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-03 05:00:40,053 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable172,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:00:40,053 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:00:40,053 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:00:40,054 INFO L85 PathProgramCache]: Analyzing trace with hash 1130855378, now seen corresponding path program 2 times [2021-11-03 05:00:40,054 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:00:40,054 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1179823519] [2021-11-03 05:00:40,054 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:00:40,054 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:00:40,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:00:40,167 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 8 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:00:40,167 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:00:40,167 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1179823519] [2021-11-03 05:00:40,167 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1179823519] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 05:00:40,168 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [828288248] [2021-11-03 05:00:40,168 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-03 05:00:40,168 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:00:40,168 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 05:00:40,169 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 05:00:40,199 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-03 05:00:40,329 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-03 05:00:40,329 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 05:00:40,330 INFO L263 TraceCheckSpWp]: Trace formula consists of 96 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-03 05:00:40,331 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:00:40,601 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 15 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:00:40,601 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:00:40,698 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 15 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:00:40,699 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [828288248] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 05:00:40,699 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1469940944] [2021-11-03 05:00:40,701 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-03 05:00:40,701 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 05:00:40,701 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 05:00:40,702 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 05:00:40,702 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 05:00:40,706 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:40,707 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:00:40,707 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:40,708 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 05:00:40,708 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:00:40,713 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:40,714 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 05:00:40,715 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 111 [2021-11-03 05:00:40,717 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_16|], 10=[|v_#valid_17|]} [2021-11-03 05:00:40,722 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:00:40,725 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 [2021-11-03 05:00:40,726 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:40,726 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:00:40,726 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:40,727 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:00:40,727 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 05:00:40,727 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:40,732 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:40,736 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:00:40,737 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:00:40,737 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:00:40,743 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:00:40,744 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 [2021-11-03 05:00:40,745 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:40,746 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:00:40,747 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:40,747 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:00:40,747 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 05:00:40,747 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:40,750 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:40,751 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:40,752 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 05:00:40,752 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 05:00:40,752 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:108, output treesize:93 [2021-11-03 05:00:40,759 INFO L180 QuantifierPusher]: treesize reduction 16, result has 87.0 percent of original size [2021-11-03 05:00:40,761 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 100 [2021-11-03 05:00:40,768 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:40,774 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:40,781 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:40,795 INFO L180 QuantifierPusher]: treesize reduction 11, result has 95.8 percent of original size [2021-11-03 05:00:40,798 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 251 [2021-11-03 05:00:40,801 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:40,826 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:40,827 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:40,828 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:40,829 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:40,829 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:40,832 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:40,838 INFO L180 QuantifierPusher]: treesize reduction 24, result has 70.7 percent of original size [2021-11-03 05:00:40,840 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 49 [2021-11-03 05:00:40,844 INFO L180 QuantifierPusher]: treesize reduction 25, result has 71.9 percent of original size [2021-11-03 05:00:40,846 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 57 [2021-11-03 05:00:40,848 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:40,852 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:40,857 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:40,866 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:40,869 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 122 [2021-11-03 05:00:40,872 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:40,884 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:40,885 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:40,886 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:40,887 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:40,888 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:40,897 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:40,908 INFO L180 QuantifierPusher]: treesize reduction 24, result has 71.8 percent of original size [2021-11-03 05:00:40,910 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 52 [2021-11-03 05:00:40,919 INFO L180 QuantifierPusher]: treesize reduction 25, result has 78.6 percent of original size [2021-11-03 05:00:40,921 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 90 [2021-11-03 05:00:40,925 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:40,931 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:40,932 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:40,933 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:40,934 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:40,938 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:40,942 INFO L180 QuantifierPusher]: treesize reduction 24, result has 78.2 percent of original size [2021-11-03 05:00:40,945 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 80 [2021-11-03 05:00:40,951 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 05:00:41,556 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 05:00:41,556 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 05:00:41,556 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 20 [2021-11-03 05:00:41,557 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [985105524] [2021-11-03 05:00:41,557 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2021-11-03 05:00:41,557 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:00:41,558 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-11-03 05:00:41,558 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=698, Unknown=0, NotChecked=0, Total=812 [2021-11-03 05:00:41,558 INFO L87 Difference]: Start difference. First operand 25 states and 30 transitions. Second operand has 21 states, 21 states have (on average 2.0952380952380953) internal successors, (44), 20 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) [2021-11-03 05:00:41,754 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:00:41,754 INFO L93 Difference]: Finished difference Result 72 states and 80 transitions. [2021-11-03 05:00:41,754 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-03 05:00:41,754 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 2.0952380952380953) internal successors, (44), 20 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) Word has length 20 [2021-11-03 05:00:41,754 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:00:41,755 INFO L225 Difference]: With dead ends: 72 [2021-11-03 05:00:41,755 INFO L226 Difference]: Without dead ends: 57 [2021-11-03 05:00:41,756 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 431 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=224, Invalid=1258, Unknown=0, NotChecked=0, Total=1482 [2021-11-03 05:00:41,756 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2021-11-03 05:00:41,760 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 25. [2021-11-03 05:00:41,760 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 24 states have (on average 1.25) internal successors, (30), 24 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) [2021-11-03 05:00:41,760 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 30 transitions. [2021-11-03 05:00:41,760 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 30 transitions. Word has length 20 [2021-11-03 05:00:41,760 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:00:41,761 INFO L470 AbstractCegarLoop]: Abstraction has 25 states and 30 transitions. [2021-11-03 05:00:41,761 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 2.0952380952380953) internal successors, (44), 20 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) [2021-11-03 05:00:41,761 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 30 transitions. [2021-11-03 05:00:41,761 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-03 05:00:41,761 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:00:41,761 INFO L513 BasicCegarLoop]: trace histogram [4, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:00:41,784 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-03 05:00:41,962 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable200 [2021-11-03 05:00:41,962 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:00:41,962 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:00:41,962 INFO L85 PathProgramCache]: Analyzing trace with hash 1350193185, now seen corresponding path program 3 times [2021-11-03 05:00:41,962 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:00:41,962 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1766411728] [2021-11-03 05:00:41,963 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:00:41,963 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:00:41,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:00:42,041 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 8 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:00:42,041 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:00:42,041 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1766411728] [2021-11-03 05:00:42,041 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1766411728] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 05:00:42,041 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1495270517] [2021-11-03 05:00:42,042 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-03 05:00:42,042 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:00:42,042 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 05:00:42,042 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 05:00:42,043 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-03 05:00:42,197 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-03 05:00:42,197 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 05:00:42,197 INFO L263 TraceCheckSpWp]: Trace formula consists of 96 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-03 05:00:42,198 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:00:42,417 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 15 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:00:42,417 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:00:42,502 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 15 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:00:42,502 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1495270517] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 05:00:42,502 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1126691754] [2021-11-03 05:00:42,504 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-03 05:00:42,504 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 05:00:42,504 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 05:00:42,504 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 05:00:42,504 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 05:00:42,510 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:42,511 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:00:42,511 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:42,512 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 05:00:42,512 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:00:42,517 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:42,517 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 05:00:42,518 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 111 [2021-11-03 05:00:42,519 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_17|], 10=[|v_#valid_18|]} [2021-11-03 05:00:42,524 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:00:42,525 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 [2021-11-03 05:00:42,525 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:42,526 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:00:42,526 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:42,526 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:00:42,526 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 05:00:42,527 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:42,529 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:42,534 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:00:42,535 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:00:42,536 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:00:42,539 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:00:42,542 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 [2021-11-03 05:00:42,542 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:42,543 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:00:42,544 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:42,545 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:00:42,545 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 05:00:42,545 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:42,547 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:42,549 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:42,550 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 05:00:42,550 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 05:00:42,550 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:108, output treesize:93 [2021-11-03 05:00:42,555 INFO L180 QuantifierPusher]: treesize reduction 16, result has 87.0 percent of original size [2021-11-03 05:00:42,557 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 100 [2021-11-03 05:00:42,560 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:42,565 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:42,570 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:42,585 INFO L180 QuantifierPusher]: treesize reduction 11, result has 95.8 percent of original size [2021-11-03 05:00:42,590 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 251 [2021-11-03 05:00:42,594 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:42,614 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:42,615 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:42,616 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:42,617 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:42,617 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:42,622 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:42,626 INFO L180 QuantifierPusher]: treesize reduction 24, result has 70.7 percent of original size [2021-11-03 05:00:42,627 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 49 [2021-11-03 05:00:42,631 INFO L180 QuantifierPusher]: treesize reduction 25, result has 71.9 percent of original size [2021-11-03 05:00:42,633 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 57 [2021-11-03 05:00:42,634 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:42,639 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:42,644 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:42,652 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:42,654 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 122 [2021-11-03 05:00:42,659 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:42,668 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:42,669 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:42,670 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:42,671 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:42,671 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:42,676 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:42,679 INFO L180 QuantifierPusher]: treesize reduction 24, result has 71.8 percent of original size [2021-11-03 05:00:42,680 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 52 [2021-11-03 05:00:42,685 INFO L180 QuantifierPusher]: treesize reduction 25, result has 78.6 percent of original size [2021-11-03 05:00:42,688 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 90 [2021-11-03 05:00:42,689 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:42,693 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:42,694 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:42,694 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:42,700 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:42,703 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:42,706 INFO L180 QuantifierPusher]: treesize reduction 24, result has 78.2 percent of original size [2021-11-03 05:00:42,708 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 80 [2021-11-03 05:00:42,711 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 05:00:43,273 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 05:00:43,274 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 05:00:43,274 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 19 [2021-11-03 05:00:43,274 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2128641693] [2021-11-03 05:00:43,274 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-03 05:00:43,274 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:00:43,275 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-03 05:00:43,275 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=648, Unknown=0, NotChecked=0, Total=756 [2021-11-03 05:00:43,275 INFO L87 Difference]: Start difference. First operand 25 states and 30 transitions. Second operand has 20 states, 20 states have (on average 2.15) internal successors, (43), 19 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) [2021-11-03 05:00:43,501 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:00:43,501 INFO L93 Difference]: Finished difference Result 87 states and 96 transitions. [2021-11-03 05:00:43,501 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-03 05:00:43,501 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.15) internal successors, (43), 19 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 20 [2021-11-03 05:00:43,501 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:00:43,502 INFO L225 Difference]: With dead ends: 87 [2021-11-03 05:00:43,502 INFO L226 Difference]: Without dead ends: 72 [2021-11-03 05:00:43,503 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 386 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=215, Invalid=1191, Unknown=0, NotChecked=0, Total=1406 [2021-11-03 05:00:43,503 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2021-11-03 05:00:43,508 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 25. [2021-11-03 05:00:43,508 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 24 states have (on average 1.25) internal successors, (30), 24 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) [2021-11-03 05:00:43,509 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 30 transitions. [2021-11-03 05:00:43,509 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 30 transitions. Word has length 20 [2021-11-03 05:00:43,509 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:00:43,509 INFO L470 AbstractCegarLoop]: Abstraction has 25 states and 30 transitions. [2021-11-03 05:00:43,510 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 2.15) internal successors, (43), 19 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) [2021-11-03 05:00:43,510 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 30 transitions. [2021-11-03 05:00:43,510 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-03 05:00:43,510 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:00:43,510 INFO L513 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:00:43,548 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-03 05:00:43,733 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable229 [2021-11-03 05:00:43,733 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:00:43,734 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:00:43,734 INFO L85 PathProgramCache]: Analyzing trace with hash 1218721266, now seen corresponding path program 3 times [2021-11-03 05:00:43,734 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:00:43,734 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [839625352] [2021-11-03 05:00:43,734 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:00:43,734 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:00:43,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:00:43,826 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 8 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:00:43,827 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:00:43,827 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [839625352] [2021-11-03 05:00:43,827 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [839625352] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 05:00:43,827 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1886797320] [2021-11-03 05:00:43,827 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-03 05:00:43,827 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:00:43,827 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 05:00:43,828 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 05:00:43,848 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-03 05:00:44,037 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-03 05:00:44,037 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 05:00:44,038 INFO L263 TraceCheckSpWp]: Trace formula consists of 96 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-03 05:00:44,039 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:00:44,266 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 15 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:00:44,266 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:00:44,349 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 15 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:00:44,349 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1886797320] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 05:00:44,349 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1264831521] [2021-11-03 05:00:44,353 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-03 05:00:44,353 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 05:00:44,353 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 05:00:44,354 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 05:00:44,354 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 05:00:44,358 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:44,359 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:00:44,359 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:44,360 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 05:00:44,360 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:00:44,361 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:44,361 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 05:00:44,362 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 111 [2021-11-03 05:00:44,365 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_18|], 10=[|v_#valid_19|]} [2021-11-03 05:00:44,371 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:00:44,373 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 [2021-11-03 05:00:44,374 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:44,374 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:00:44,375 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:44,375 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:00:44,376 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 05:00:44,376 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:44,378 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:44,381 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:00:44,382 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:00:44,384 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:00:44,388 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:00:44,391 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 [2021-11-03 05:00:44,392 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:44,393 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:00:44,394 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:44,394 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:00:44,394 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 05:00:44,395 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:44,398 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:44,400 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:44,402 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 05:00:44,402 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 05:00:44,402 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:108, output treesize:93 [2021-11-03 05:00:44,407 INFO L180 QuantifierPusher]: treesize reduction 16, result has 87.0 percent of original size [2021-11-03 05:00:44,409 INFO L185 QuantifierPusher]: treesize reduction 5, result has 94.8 percent of original size 91 [2021-11-03 05:00:44,412 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:44,418 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:44,425 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:44,441 INFO L180 QuantifierPusher]: treesize reduction 6, result has 97.7 percent of original size [2021-11-03 05:00:44,450 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 249 [2021-11-03 05:00:44,454 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:44,473 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:44,474 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:44,474 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:44,475 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:44,479 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:44,483 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:44,486 INFO L180 QuantifierPusher]: treesize reduction 24, result has 70.7 percent of original size [2021-11-03 05:00:44,488 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 49 [2021-11-03 05:00:44,494 INFO L180 QuantifierPusher]: treesize reduction 26, result has 78.5 percent of original size [2021-11-03 05:00:44,497 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 90 [2021-11-03 05:00:44,499 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:44,505 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:44,506 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:44,507 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:44,508 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:44,510 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:44,516 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:44,519 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 138 [2021-11-03 05:00:44,521 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:44,542 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:44,542 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:44,543 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:44,543 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:44,544 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:44,544 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:44,545 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:44,547 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:44,552 INFO L180 QuantifierPusher]: treesize reduction 30, result has 74.1 percent of original size [2021-11-03 05:00:44,554 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 80 [2021-11-03 05:00:44,558 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 05:00:45,180 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 05:00:45,180 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 05:00:45,180 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 18 [2021-11-03 05:00:45,180 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1513577433] [2021-11-03 05:00:45,180 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-11-03 05:00:45,181 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:00:45,181 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-11-03 05:00:45,181 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=597, Unknown=0, NotChecked=0, Total=702 [2021-11-03 05:00:45,182 INFO L87 Difference]: Start difference. First operand 25 states and 30 transitions. Second operand has 19 states, 19 states have (on average 2.1578947368421053) internal successors, (41), 18 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:00:45,354 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:00:45,354 INFO L93 Difference]: Finished difference Result 103 states and 114 transitions. [2021-11-03 05:00:45,355 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-03 05:00:45,355 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 2.1578947368421053) internal successors, (41), 18 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-11-03 05:00:45,355 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:00:45,356 INFO L225 Difference]: With dead ends: 103 [2021-11-03 05:00:45,356 INFO L226 Difference]: Without dead ends: 88 [2021-11-03 05:00:45,357 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 301 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=194, Invalid=996, Unknown=0, NotChecked=0, Total=1190 [2021-11-03 05:00:45,357 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2021-11-03 05:00:45,362 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 26. [2021-11-03 05:00:45,362 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 25 states have (on average 1.28) internal successors, (32), 25 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) [2021-11-03 05:00:45,363 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 32 transitions. [2021-11-03 05:00:45,363 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 32 transitions. Word has length 20 [2021-11-03 05:00:45,363 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:00:45,363 INFO L470 AbstractCegarLoop]: Abstraction has 26 states and 32 transitions. [2021-11-03 05:00:45,363 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 2.1578947368421053) internal successors, (41), 18 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:00:45,364 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 32 transitions. [2021-11-03 05:00:45,364 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-11-03 05:00:45,364 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:00:45,364 INFO L513 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:00:45,399 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-03 05:00:45,581 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable258,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:00:45,581 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:00:45,581 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:00:45,581 INFO L85 PathProgramCache]: Analyzing trace with hash -1794699323, now seen corresponding path program 6 times [2021-11-03 05:00:45,581 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:00:45,581 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [172179628] [2021-11-03 05:00:45,581 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:00:45,582 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:00:45,590 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:00:45,638 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 6 proven. 19 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:00:45,639 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:00:45,639 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [172179628] [2021-11-03 05:00:45,639 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [172179628] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 05:00:45,639 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1130357827] [2021-11-03 05:00:45,639 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-03 05:00:45,640 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:00:45,640 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 05:00:45,653 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 05:00:45,657 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-03 05:00:45,848 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-03 05:00:45,848 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 05:00:45,849 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-03 05:00:45,850 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:00:45,943 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 10 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:00:45,943 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:00:46,017 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 10 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:00:46,017 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1130357827] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 05:00:46,017 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1342784221] [2021-11-03 05:00:46,022 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-03 05:00:46,022 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 05:00:46,022 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 05:00:46,022 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 05:00:46,023 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 05:00:46,028 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:46,029 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:00:46,029 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:46,030 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 05:00:46,030 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:00:46,030 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:46,031 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 05:00:46,036 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 111 [2021-11-03 05:00:46,038 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_19|], 10=[|v_#valid_20|]} [2021-11-03 05:00:46,043 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:00:46,044 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 [2021-11-03 05:00:46,045 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:46,045 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:00:46,045 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:46,045 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:00:46,046 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 05:00:46,046 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:46,047 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:46,049 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:00:46,050 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:00:46,051 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:00:46,054 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:00:46,056 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 [2021-11-03 05:00:46,056 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:46,057 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:00:46,058 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:46,058 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:00:46,058 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 05:00:46,058 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:46,060 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:46,061 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:46,062 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 05:00:46,063 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 05:00:46,063 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:108, output treesize:93 [2021-11-03 05:00:46,069 INFO L180 QuantifierPusher]: treesize reduction 17, result has 86.9 percent of original size [2021-11-03 05:00:46,071 INFO L185 QuantifierPusher]: treesize reduction 5, result has 95.1 percent of original size 97 [2021-11-03 05:00:46,072 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:46,077 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:46,089 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:46,102 INFO L180 QuantifierPusher]: treesize reduction 12, result has 95.7 percent of original size [2021-11-03 05:00:46,105 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 267 [2021-11-03 05:00:46,109 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:46,126 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:46,127 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:46,128 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:46,128 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:46,128 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:46,133 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:46,136 INFO L180 QuantifierPusher]: treesize reduction 30, result has 67.0 percent of original size [2021-11-03 05:00:46,137 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 52 [2021-11-03 05:00:46,141 INFO L180 QuantifierPusher]: treesize reduction 31, result has 74.8 percent of original size [2021-11-03 05:00:46,143 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 87 [2021-11-03 05:00:46,145 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:46,150 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:46,151 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:46,151 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:46,152 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:46,154 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:46,158 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:46,165 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 138 [2021-11-03 05:00:46,167 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:46,179 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:46,180 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:46,181 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:46,182 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:46,183 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:46,184 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:46,185 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:46,190 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:46,195 INFO L180 QuantifierPusher]: treesize reduction 30, result has 74.1 percent of original size [2021-11-03 05:00:46,198 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 80 [2021-11-03 05:00:46,205 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 05:00:46,781 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 05:00:46,781 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 05:00:46,781 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 9 [2021-11-03 05:00:46,781 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1311393256] [2021-11-03 05:00:46,782 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-03 05:00:46,782 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:00:46,782 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-03 05:00:46,782 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=241, Unknown=0, NotChecked=0, Total=306 [2021-11-03 05:00:46,782 INFO L87 Difference]: Start difference. First operand 26 states and 32 transitions. Second operand has 10 states, 10 states have (on average 2.8) internal successors, (28), 9 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) [2021-11-03 05:00:46,890 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:00:46,891 INFO L93 Difference]: Finished difference Result 37 states and 43 transitions. [2021-11-03 05:00:46,891 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-03 05:00:46,891 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.8) internal successors, (28), 9 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-11-03 05:00:46,891 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:00:46,891 INFO L225 Difference]: With dead ends: 37 [2021-11-03 05:00:46,891 INFO L226 Difference]: Without dead ends: 35 [2021-11-03 05:00:46,892 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 53 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 134 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=122, Invalid=430, Unknown=0, NotChecked=0, Total=552 [2021-11-03 05:00:46,892 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2021-11-03 05:00:46,896 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 29. [2021-11-03 05:00:46,897 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 28 states have (on average 1.25) internal successors, (35), 28 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) [2021-11-03 05:00:46,897 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 35 transitions. [2021-11-03 05:00:46,897 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 35 transitions. Word has length 21 [2021-11-03 05:00:46,897 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:00:46,897 INFO L470 AbstractCegarLoop]: Abstraction has 29 states and 35 transitions. [2021-11-03 05:00:46,897 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 2.8) internal successors, (28), 9 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) [2021-11-03 05:00:46,898 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 35 transitions. [2021-11-03 05:00:46,898 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-11-03 05:00:46,898 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:00:46,898 INFO L513 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:00:46,920 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-03 05:00:47,101 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable286,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:00:47,101 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:00:47,101 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:00:47,101 INFO L85 PathProgramCache]: Analyzing trace with hash -2129787765, now seen corresponding path program 7 times [2021-11-03 05:00:47,101 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:00:47,102 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [929340518] [2021-11-03 05:00:47,102 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:00:47,102 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:00:47,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:00:47,207 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 16 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:00:47,207 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:00:47,207 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [929340518] [2021-11-03 05:00:47,207 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [929340518] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 05:00:47,207 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [399292117] [2021-11-03 05:00:47,207 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-03 05:00:47,208 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:00:47,208 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 05:00:47,210 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 05:00:47,211 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-03 05:00:47,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:00:47,418 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-03 05:00:47,420 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:00:47,699 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 26 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:00:47,699 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:00:47,805 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 26 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:00:47,805 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [399292117] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 05:00:47,805 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [821810682] [2021-11-03 05:00:47,806 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-03 05:00:47,806 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 05:00:47,806 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 05:00:47,806 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 05:00:47,807 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 05:00:47,810 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:47,810 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:00:47,810 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:47,811 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 05:00:47,811 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:00:47,811 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:47,811 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 05:00:47,812 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 111 [2021-11-03 05:00:47,814 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_20|], 10=[|v_#valid_21|]} [2021-11-03 05:00:47,822 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:00:47,823 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 [2021-11-03 05:00:47,824 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:47,824 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:00:47,824 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:47,824 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:00:47,825 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 05:00:47,825 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:47,829 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:47,831 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:00:47,832 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:00:47,833 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:00:47,836 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:00:47,837 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 [2021-11-03 05:00:47,837 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:47,838 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:00:47,839 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:47,840 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:00:47,840 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 05:00:47,841 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:47,842 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:47,843 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:47,843 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 05:00:47,844 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 05:00:47,844 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:108, output treesize:93 [2021-11-03 05:00:47,855 INFO L180 QuantifierPusher]: treesize reduction 17, result has 86.9 percent of original size [2021-11-03 05:00:47,857 INFO L185 QuantifierPusher]: treesize reduction 5, result has 95.1 percent of original size 97 [2021-11-03 05:00:47,858 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:47,863 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:47,874 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:47,901 INFO L180 QuantifierPusher]: treesize reduction 12, result has 95.7 percent of original size [2021-11-03 05:00:47,908 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 267 [2021-11-03 05:00:47,912 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:47,928 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:47,929 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:47,930 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:47,931 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:47,931 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:47,933 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:47,936 INFO L180 QuantifierPusher]: treesize reduction 30, result has 67.0 percent of original size [2021-11-03 05:00:47,937 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 52 [2021-11-03 05:00:47,945 INFO L180 QuantifierPusher]: treesize reduction 31, result has 74.8 percent of original size [2021-11-03 05:00:47,947 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 87 [2021-11-03 05:00:47,949 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:47,953 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:47,953 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:47,954 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:47,954 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:47,956 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:47,962 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:47,964 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 138 [2021-11-03 05:00:47,965 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:47,972 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:47,977 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:47,977 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:47,983 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:47,984 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:47,984 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:47,985 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:47,987 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:47,991 INFO L180 QuantifierPusher]: treesize reduction 30, result has 74.1 percent of original size [2021-11-03 05:00:47,992 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 80 [2021-11-03 05:00:47,996 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 05:00:48,628 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 05:00:48,629 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 05:00:48,629 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 25 [2021-11-03 05:00:48,629 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1673322964] [2021-11-03 05:00:48,629 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-03 05:00:48,629 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:00:48,629 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-03 05:00:48,630 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=172, Invalid=950, Unknown=0, NotChecked=0, Total=1122 [2021-11-03 05:00:48,630 INFO L87 Difference]: Start difference. First operand 29 states and 35 transitions. Second operand has 26 states, 26 states have (on average 2.0) internal successors, (52), 25 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) [2021-11-03 05:00:48,828 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:00:48,828 INFO L93 Difference]: Finished difference Result 68 states and 76 transitions. [2021-11-03 05:00:48,828 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-03 05:00:48,828 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 2.0) internal successors, (52), 25 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-11-03 05:00:48,828 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:00:48,829 INFO L225 Difference]: With dead ends: 68 [2021-11-03 05:00:48,829 INFO L226 Difference]: Without dead ends: 50 [2021-11-03 05:00:48,830 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 50 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 588 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=305, Invalid=1587, Unknown=0, NotChecked=0, Total=1892 [2021-11-03 05:00:48,830 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2021-11-03 05:00:48,835 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 30. [2021-11-03 05:00:48,835 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 29 states have (on average 1.2413793103448276) internal successors, (36), 29 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) [2021-11-03 05:00:48,836 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 36 transitions. [2021-11-03 05:00:48,836 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 36 transitions. Word has length 24 [2021-11-03 05:00:48,836 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:00:48,837 INFO L470 AbstractCegarLoop]: Abstraction has 30 states and 36 transitions. [2021-11-03 05:00:48,837 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 2.0) internal successors, (52), 25 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) [2021-11-03 05:00:48,837 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 36 transitions. [2021-11-03 05:00:48,837 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-11-03 05:00:48,838 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:00:48,838 INFO L513 BasicCegarLoop]: trace histogram [5, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:00:48,871 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-03 05:00:49,065 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable314 [2021-11-03 05:00:49,065 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:00:49,065 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:00:49,065 INFO L85 PathProgramCache]: Analyzing trace with hash 426674588, now seen corresponding path program 4 times [2021-11-03 05:00:49,065 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:00:49,065 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1035641011] [2021-11-03 05:00:49,066 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:00:49,066 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:00:49,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:00:49,171 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 16 proven. 17 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:00:49,171 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:00:49,171 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1035641011] [2021-11-03 05:00:49,171 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1035641011] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 05:00:49,171 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [671604743] [2021-11-03 05:00:49,172 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-03 05:00:49,172 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:00:49,172 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 05:00:49,172 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 05:00:49,173 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-03 05:00:49,399 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:00:49,400 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-03 05:00:49,401 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:00:49,684 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 26 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:00:49,685 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:00:49,851 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 26 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:00:49,851 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [671604743] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 05:00:49,852 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1468316922] [2021-11-03 05:00:49,856 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-03 05:00:49,856 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 05:00:49,857 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 05:00:49,857 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 05:00:49,857 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 05:00:49,864 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:49,864 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:00:49,870 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:49,871 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 05:00:49,871 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:00:49,872 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:49,872 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 05:00:49,873 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 111 [2021-11-03 05:00:49,876 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_21|], 10=[|v_#valid_22|]} [2021-11-03 05:00:49,883 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:00:49,884 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 [2021-11-03 05:00:49,884 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:49,885 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:00:49,886 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:49,901 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:00:49,902 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 05:00:49,902 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:49,904 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:49,907 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:00:49,908 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:00:49,910 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:00:49,915 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:00:49,916 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 [2021-11-03 05:00:49,917 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:49,919 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:00:49,919 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:49,920 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:00:49,920 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 05:00:49,920 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:49,922 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:49,923 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:49,924 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 05:00:49,925 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 05:00:49,925 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:108, output treesize:93 [2021-11-03 05:00:49,930 INFO L180 QuantifierPusher]: treesize reduction 16, result has 87.0 percent of original size [2021-11-03 05:00:49,932 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 102 [2021-11-03 05:00:49,934 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:49,940 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:49,945 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:49,958 INFO L180 QuantifierPusher]: treesize reduction 6, result has 97.7 percent of original size [2021-11-03 05:00:49,962 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 251 [2021-11-03 05:00:49,966 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:49,983 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:49,984 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:49,984 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:49,985 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:49,985 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:49,989 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:49,992 INFO L180 QuantifierPusher]: treesize reduction 24, result has 70.7 percent of original size [2021-11-03 05:00:49,994 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 49 [2021-11-03 05:00:49,998 INFO L180 QuantifierPusher]: treesize reduction 25, result has 71.9 percent of original size [2021-11-03 05:00:50,000 INFO L185 QuantifierPusher]: treesize reduction 5, result has 90.6 percent of original size 48 [2021-11-03 05:00:50,001 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:50,005 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:50,009 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:50,014 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:50,016 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 120 [2021-11-03 05:00:50,018 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:50,024 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:50,024 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:50,028 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:50,029 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:50,029 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:50,031 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:50,034 INFO L180 QuantifierPusher]: treesize reduction 24, result has 71.8 percent of original size [2021-11-03 05:00:50,036 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 52 [2021-11-03 05:00:50,041 INFO L180 QuantifierPusher]: treesize reduction 25, result has 78.6 percent of original size [2021-11-03 05:00:50,043 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 87 [2021-11-03 05:00:50,045 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:50,050 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:50,051 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:50,055 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:50,056 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:50,058 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:50,062 INFO L180 QuantifierPusher]: treesize reduction 24, result has 78.2 percent of original size [2021-11-03 05:00:50,063 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 80 [2021-11-03 05:00:50,067 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 05:00:50,666 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 05:00:50,667 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 05:00:50,667 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 24 [2021-11-03 05:00:50,667 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1647811727] [2021-11-03 05:00:50,667 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-11-03 05:00:50,667 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:00:50,667 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-11-03 05:00:50,668 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=147, Invalid=909, Unknown=0, NotChecked=0, Total=1056 [2021-11-03 05:00:50,668 INFO L87 Difference]: Start difference. First operand 30 states and 36 transitions. Second operand has 25 states, 25 states have (on average 2.08) internal successors, (52), 24 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) [2021-11-03 05:00:50,925 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:00:50,925 INFO L93 Difference]: Finished difference Result 88 states and 97 transitions. [2021-11-03 05:00:50,926 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-03 05:00:50,926 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 2.08) internal successors, (52), 24 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-11-03 05:00:50,926 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:00:50,927 INFO L225 Difference]: With dead ends: 88 [2021-11-03 05:00:50,927 INFO L226 Difference]: Without dead ends: 70 [2021-11-03 05:00:50,928 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 635 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=310, Invalid=1760, Unknown=0, NotChecked=0, Total=2070 [2021-11-03 05:00:50,928 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2021-11-03 05:00:50,934 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 30. [2021-11-03 05:00:50,934 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 29 states have (on average 1.2413793103448276) internal successors, (36), 29 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) [2021-11-03 05:00:50,935 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 36 transitions. [2021-11-03 05:00:50,935 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 36 transitions. Word has length 24 [2021-11-03 05:00:50,935 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:00:50,935 INFO L470 AbstractCegarLoop]: Abstraction has 30 states and 36 transitions. [2021-11-03 05:00:50,936 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 2.08) internal successors, (52), 24 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) [2021-11-03 05:00:50,936 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 36 transitions. [2021-11-03 05:00:50,936 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-11-03 05:00:50,936 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:00:50,937 INFO L513 BasicCegarLoop]: trace histogram [5, 4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:00:50,961 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-11-03 05:00:51,149 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable342 [2021-11-03 05:00:51,149 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:00:51,149 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:00:51,149 INFO L85 PathProgramCache]: Analyzing trace with hash -45048213, now seen corresponding path program 5 times [2021-11-03 05:00:51,149 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:00:51,149 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [165977398] [2021-11-03 05:00:51,149 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:00:51,150 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:00:51,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:00:51,246 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 16 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:00:51,246 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:00:51,246 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [165977398] [2021-11-03 05:00:51,246 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [165977398] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 05:00:51,247 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [589411508] [2021-11-03 05:00:51,247 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-03 05:00:51,247 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:00:51,247 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 05:00:51,249 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 05:00:51,250 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-03 05:00:51,496 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-03 05:00:51,496 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 05:00:51,497 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-03 05:00:51,498 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:00:51,749 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 26 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:00:51,750 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:00:51,847 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 26 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:00:51,847 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [589411508] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 05:00:51,847 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1924389816] [2021-11-03 05:00:51,848 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-03 05:00:51,848 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 05:00:51,848 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 05:00:51,849 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 05:00:51,849 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 05:00:51,851 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:51,852 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:00:51,852 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:51,852 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 05:00:51,853 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:00:51,853 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:51,853 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 05:00:51,854 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 111 [2021-11-03 05:00:51,855 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_22|], 10=[|v_#valid_23|]} [2021-11-03 05:00:51,860 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:00:51,860 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 [2021-11-03 05:00:51,861 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:51,861 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:00:51,862 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:51,862 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:00:51,863 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 05:00:51,863 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:51,864 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:51,867 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:00:51,868 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:00:51,869 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:00:51,882 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:00:51,883 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 [2021-11-03 05:00:51,883 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:51,888 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:00:51,889 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:51,889 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:00:51,889 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 05:00:51,890 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:51,891 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:51,892 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:51,893 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 05:00:51,893 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 05:00:51,894 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:108, output treesize:93 [2021-11-03 05:00:51,900 INFO L180 QuantifierPusher]: treesize reduction 16, result has 87.0 percent of original size [2021-11-03 05:00:51,901 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 100 [2021-11-03 05:00:51,903 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:51,908 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:51,914 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:51,927 INFO L180 QuantifierPusher]: treesize reduction 11, result has 95.8 percent of original size [2021-11-03 05:00:51,930 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 251 [2021-11-03 05:00:51,935 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:51,949 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:51,950 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:51,951 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:51,952 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:51,952 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:51,955 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:51,959 INFO L180 QuantifierPusher]: treesize reduction 24, result has 70.7 percent of original size [2021-11-03 05:00:51,960 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 49 [2021-11-03 05:00:51,963 INFO L180 QuantifierPusher]: treesize reduction 25, result has 71.9 percent of original size [2021-11-03 05:00:51,965 INFO L185 QuantifierPusher]: treesize reduction 5, result has 90.6 percent of original size 48 [2021-11-03 05:00:51,966 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:51,970 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:51,974 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:51,981 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:51,983 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 120 [2021-11-03 05:00:51,985 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:51,992 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:51,992 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:51,993 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:51,994 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:51,994 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:51,995 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:51,998 INFO L180 QuantifierPusher]: treesize reduction 24, result has 71.8 percent of original size [2021-11-03 05:00:51,999 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 52 [2021-11-03 05:00:52,002 INFO L180 QuantifierPusher]: treesize reduction 25, result has 78.6 percent of original size [2021-11-03 05:00:52,004 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 90 [2021-11-03 05:00:52,005 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:52,013 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:52,014 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:52,014 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:52,015 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:52,030 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:52,034 INFO L180 QuantifierPusher]: treesize reduction 24, result has 78.2 percent of original size [2021-11-03 05:00:52,036 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 80 [2021-11-03 05:00:52,041 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 05:00:52,642 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 05:00:52,642 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 05:00:52,642 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 23 [2021-11-03 05:00:52,642 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1192354206] [2021-11-03 05:00:52,643 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-11-03 05:00:52,643 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:00:52,643 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-11-03 05:00:52,644 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=854, Unknown=0, NotChecked=0, Total=992 [2021-11-03 05:00:52,644 INFO L87 Difference]: Start difference. First operand 30 states and 36 transitions. Second operand has 24 states, 24 states have (on average 2.125) internal successors, (51), 23 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) [2021-11-03 05:00:52,900 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:00:52,900 INFO L93 Difference]: Finished difference Result 107 states and 117 transitions. [2021-11-03 05:00:52,900 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-03 05:00:52,900 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 2.125) internal successors, (51), 23 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 24 [2021-11-03 05:00:52,901 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:00:52,901 INFO L225 Difference]: With dead ends: 107 [2021-11-03 05:00:52,901 INFO L226 Difference]: Without dead ends: 89 [2021-11-03 05:00:52,902 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 620 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=310, Invalid=1760, Unknown=0, NotChecked=0, Total=2070 [2021-11-03 05:00:52,903 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2021-11-03 05:00:52,909 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 30. [2021-11-03 05:00:52,909 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 29 states have (on average 1.2413793103448276) internal successors, (36), 29 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) [2021-11-03 05:00:52,909 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 36 transitions. [2021-11-03 05:00:52,910 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 36 transitions. Word has length 24 [2021-11-03 05:00:52,910 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:00:52,910 INFO L470 AbstractCegarLoop]: Abstraction has 30 states and 36 transitions. [2021-11-03 05:00:52,910 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 2.125) internal successors, (51), 23 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) [2021-11-03 05:00:52,910 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 36 transitions. [2021-11-03 05:00:52,911 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-11-03 05:00:52,911 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:00:52,911 INFO L513 BasicCegarLoop]: trace histogram [5, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:00:52,938 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-03 05:00:53,129 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable371,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:00:53,129 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:00:53,129 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:00:53,129 INFO L85 PathProgramCache]: Analyzing trace with hash 1602302908, now seen corresponding path program 6 times [2021-11-03 05:00:53,129 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:00:53,129 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [371745242] [2021-11-03 05:00:53,129 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:00:53,130 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:00:53,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:00:53,234 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 16 proven. 17 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:00:53,235 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:00:53,235 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [371745242] [2021-11-03 05:00:53,235 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [371745242] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 05:00:53,235 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1815458814] [2021-11-03 05:00:53,235 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-03 05:00:53,235 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:00:53,235 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 05:00:53,236 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 05:00:53,237 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-03 05:00:53,502 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-03 05:00:53,503 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 05:00:53,503 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-03 05:00:53,505 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:00:53,768 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 26 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:00:53,769 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:00:53,863 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 26 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:00:53,863 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1815458814] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 05:00:53,863 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [941880444] [2021-11-03 05:00:53,864 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-03 05:00:53,864 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 05:00:53,864 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 05:00:53,864 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 05:00:53,865 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 05:00:53,878 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:53,879 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:00:53,879 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:53,879 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 05:00:53,880 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:00:53,880 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:53,881 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 05:00:53,882 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 111 [2021-11-03 05:00:53,884 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_23|], 10=[|v_#valid_24|]} [2021-11-03 05:00:53,890 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:00:53,890 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 [2021-11-03 05:00:53,891 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:53,891 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:00:53,892 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:53,892 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:00:53,892 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 05:00:53,893 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:53,895 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:53,897 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:00:53,898 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:00:53,899 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:00:53,903 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:00:53,904 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 [2021-11-03 05:00:53,904 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:53,906 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:00:53,906 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:53,907 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:00:53,907 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 05:00:53,907 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:53,909 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:53,910 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:53,911 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 05:00:53,911 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 05:00:53,911 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:108, output treesize:93 [2021-11-03 05:00:53,914 INFO L180 QuantifierPusher]: treesize reduction 16, result has 87.0 percent of original size [2021-11-03 05:00:53,916 INFO L185 QuantifierPusher]: treesize reduction 7, result has 92.9 percent of original size 91 [2021-11-03 05:00:53,918 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:53,922 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:53,928 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:53,940 INFO L180 QuantifierPusher]: treesize reduction 6, result has 97.7 percent of original size [2021-11-03 05:00:53,945 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 249 [2021-11-03 05:00:53,948 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:53,966 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:53,967 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:53,968 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:53,969 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:53,969 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:53,974 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:53,977 INFO L180 QuantifierPusher]: treesize reduction 24, result has 70.7 percent of original size [2021-11-03 05:00:53,979 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 49 [2021-11-03 05:00:53,982 INFO L180 QuantifierPusher]: treesize reduction 25, result has 71.9 percent of original size [2021-11-03 05:00:53,984 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 57 [2021-11-03 05:00:53,985 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:53,989 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:53,994 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:54,002 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:54,005 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 122 [2021-11-03 05:00:54,007 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:54,016 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:54,017 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:54,017 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:54,018 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:54,019 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:54,021 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:54,025 INFO L180 QuantifierPusher]: treesize reduction 24, result has 71.8 percent of original size [2021-11-03 05:00:54,026 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 52 [2021-11-03 05:00:54,031 INFO L180 QuantifierPusher]: treesize reduction 25, result has 78.6 percent of original size [2021-11-03 05:00:54,033 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 87 [2021-11-03 05:00:54,035 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:54,040 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:54,041 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:54,042 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:54,043 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:54,045 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:54,049 INFO L180 QuantifierPusher]: treesize reduction 24, result has 78.2 percent of original size [2021-11-03 05:00:54,051 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 80 [2021-11-03 05:00:54,056 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 05:00:54,668 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 05:00:54,668 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 05:00:54,668 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 22 [2021-11-03 05:00:54,668 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [100192746] [2021-11-03 05:00:54,669 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-11-03 05:00:54,669 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:00:54,669 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-11-03 05:00:54,669 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=133, Invalid=797, Unknown=0, NotChecked=0, Total=930 [2021-11-03 05:00:54,670 INFO L87 Difference]: Start difference. First operand 30 states and 36 transitions. Second operand has 23 states, 23 states have (on average 2.1739130434782608) internal successors, (50), 22 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) [2021-11-03 05:00:54,909 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:00:54,909 INFO L93 Difference]: Finished difference Result 125 states and 136 transitions. [2021-11-03 05:00:54,909 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-03 05:00:54,909 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 2.1739130434782608) internal successors, (50), 22 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 24 [2021-11-03 05:00:54,909 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:00:54,910 INFO L225 Difference]: With dead ends: 125 [2021-11-03 05:00:54,910 INFO L226 Difference]: Without dead ends: 107 [2021-11-03 05:00:54,911 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 53 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 534 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=288, Invalid=1604, Unknown=0, NotChecked=0, Total=1892 [2021-11-03 05:00:54,911 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2021-11-03 05:00:54,917 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 30. [2021-11-03 05:00:54,917 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 29 states have (on average 1.2413793103448276) internal successors, (36), 29 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) [2021-11-03 05:00:54,918 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 36 transitions. [2021-11-03 05:00:54,918 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 36 transitions. Word has length 24 [2021-11-03 05:00:54,918 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:00:54,918 INFO L470 AbstractCegarLoop]: Abstraction has 30 states and 36 transitions. [2021-11-03 05:00:54,919 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 2.1739130434782608) internal successors, (50), 22 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) [2021-11-03 05:00:54,919 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 36 transitions. [2021-11-03 05:00:54,919 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-11-03 05:00:54,919 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:00:54,919 INFO L513 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:00:54,946 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-11-03 05:00:55,129 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable400 [2021-11-03 05:00:55,129 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:00:55,131 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:00:55,131 INFO L85 PathProgramCache]: Analyzing trace with hash 1932537931, now seen corresponding path program 4 times [2021-11-03 05:00:55,131 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:00:55,131 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1633921027] [2021-11-03 05:00:55,131 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:00:55,131 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:00:55,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:00:55,215 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 16 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:00:55,216 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:00:55,216 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1633921027] [2021-11-03 05:00:55,216 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1633921027] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 05:00:55,216 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1965271106] [2021-11-03 05:00:55,216 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-03 05:00:55,216 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:00:55,216 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 05:00:55,217 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 05:00:55,218 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-11-03 05:00:55,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:00:55,507 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-03 05:00:55,509 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:00:55,729 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 26 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:00:55,729 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:00:55,808 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 26 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:00:55,808 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1965271106] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 05:00:55,808 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [117863724] [2021-11-03 05:00:55,809 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-03 05:00:55,810 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 05:00:55,810 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 05:00:55,810 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 05:00:55,810 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 05:00:55,821 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:55,821 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:00:55,822 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:55,822 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 05:00:55,822 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:00:55,822 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:55,823 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 05:00:55,823 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 111 [2021-11-03 05:00:55,825 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_24|], 10=[|v_#valid_25|]} [2021-11-03 05:00:55,830 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:00:55,830 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 [2021-11-03 05:00:55,831 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:55,831 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:00:55,831 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:55,831 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:00:55,832 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 05:00:55,832 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:55,833 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:55,835 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:00:55,836 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:00:55,837 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:00:55,840 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:00:55,841 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 [2021-11-03 05:00:55,841 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:55,842 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:00:55,842 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:55,847 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:00:55,847 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 05:00:55,847 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:55,849 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:55,849 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:55,850 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 05:00:55,850 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 05:00:55,850 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:108, output treesize:93 [2021-11-03 05:00:55,870 INFO L180 QuantifierPusher]: treesize reduction 16, result has 87.0 percent of original size [2021-11-03 05:00:55,872 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 102 [2021-11-03 05:00:55,874 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:55,880 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:55,887 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:55,901 INFO L180 QuantifierPusher]: treesize reduction 6, result has 97.7 percent of original size [2021-11-03 05:00:55,904 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 251 [2021-11-03 05:00:55,907 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:55,918 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:55,918 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:55,920 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:55,920 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:55,921 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:55,927 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:55,931 INFO L180 QuantifierPusher]: treesize reduction 24, result has 70.7 percent of original size [2021-11-03 05:00:55,933 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 49 [2021-11-03 05:00:55,939 INFO L180 QuantifierPusher]: treesize reduction 26, result has 78.5 percent of original size [2021-11-03 05:00:55,941 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 90 [2021-11-03 05:00:55,943 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:55,949 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:55,951 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:55,952 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:55,952 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:55,955 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:55,961 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:55,964 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 138 [2021-11-03 05:00:55,966 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:55,985 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:55,986 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:55,986 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:55,987 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:55,987 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:55,988 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:55,989 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:55,991 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:55,996 INFO L180 QuantifierPusher]: treesize reduction 30, result has 74.1 percent of original size [2021-11-03 05:00:56,000 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 80 [2021-11-03 05:00:56,005 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 05:00:56,613 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 05:00:56,613 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 05:00:56,613 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 21 [2021-11-03 05:00:56,613 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1321944155] [2021-11-03 05:00:56,614 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-11-03 05:00:56,614 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:00:56,614 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-11-03 05:00:56,615 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=131, Invalid=739, Unknown=0, NotChecked=0, Total=870 [2021-11-03 05:00:56,615 INFO L87 Difference]: Start difference. First operand 30 states and 36 transitions. Second operand has 22 states, 22 states have (on average 2.1818181818181817) internal successors, (48), 21 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) [2021-11-03 05:00:56,814 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:00:56,814 INFO L93 Difference]: Finished difference Result 144 states and 157 transitions. [2021-11-03 05:00:56,815 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-03 05:00:56,815 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.1818181818181817) internal successors, (48), 21 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) Word has length 24 [2021-11-03 05:00:56,815 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:00:56,816 INFO L225 Difference]: With dead ends: 144 [2021-11-03 05:00:56,816 INFO L226 Difference]: Without dead ends: 126 [2021-11-03 05:00:56,817 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 54 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 410 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=254, Invalid=1306, Unknown=0, NotChecked=0, Total=1560 [2021-11-03 05:00:56,817 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2021-11-03 05:00:56,822 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 31. [2021-11-03 05:00:56,822 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 30 states have (on average 1.2666666666666666) internal successors, (38), 30 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) [2021-11-03 05:00:56,822 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 38 transitions. [2021-11-03 05:00:56,822 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 38 transitions. Word has length 24 [2021-11-03 05:00:56,823 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:00:56,823 INFO L470 AbstractCegarLoop]: Abstraction has 31 states and 38 transitions. [2021-11-03 05:00:56,823 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 2.1818181818181817) internal successors, (48), 21 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) [2021-11-03 05:00:56,823 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 38 transitions. [2021-11-03 05:00:56,823 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-11-03 05:00:56,823 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:00:56,823 INFO L513 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:00:56,845 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2021-11-03 05:00:57,024 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable429,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:00:57,024 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:00:57,024 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:00:57,024 INFO L85 PathProgramCache]: Analyzing trace with hash -1469256689, now seen corresponding path program 8 times [2021-11-03 05:00:57,024 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:00:57,024 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1285304974] [2021-11-03 05:00:57,024 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:00:57,025 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:00:57,034 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:00:57,083 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 10 proven. 31 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:00:57,084 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:00:57,084 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1285304974] [2021-11-03 05:00:57,084 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1285304974] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 05:00:57,084 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1577991962] [2021-11-03 05:00:57,084 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-03 05:00:57,085 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:00:57,085 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 05:00:57,086 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 05:00:57,109 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-11-03 05:00:57,432 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-03 05:00:57,432 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 05:00:57,433 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-03 05:00:57,434 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:00:57,509 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 15 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:00:57,509 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:00:57,603 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 15 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:00:57,603 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1577991962] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 05:00:57,603 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [903792003] [2021-11-03 05:00:57,604 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-03 05:00:57,604 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 05:00:57,605 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 05:00:57,605 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 05:00:57,605 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 05:00:57,609 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:57,610 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:00:57,610 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:57,610 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 05:00:57,611 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:00:57,611 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:57,612 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 05:00:57,613 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 111 [2021-11-03 05:00:57,616 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_25|], 10=[|v_#valid_26|]} [2021-11-03 05:00:57,621 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:00:57,622 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 [2021-11-03 05:00:57,623 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:57,623 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:00:57,624 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:57,624 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:00:57,624 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 05:00:57,624 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:57,626 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:57,629 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:00:57,630 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:00:57,631 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:00:57,635 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:00:57,641 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 [2021-11-03 05:00:57,641 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:57,643 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:00:57,643 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:57,644 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:00:57,644 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 05:00:57,644 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:57,646 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:57,647 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:57,648 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 05:00:57,648 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 05:00:57,649 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:108, output treesize:93 [2021-11-03 05:00:57,654 INFO L180 QuantifierPusher]: treesize reduction 17, result has 86.9 percent of original size [2021-11-03 05:00:57,657 INFO L185 QuantifierPusher]: treesize reduction 7, result has 93.3 percent of original size 97 [2021-11-03 05:00:57,659 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:57,665 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:57,672 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:57,710 INFO L180 QuantifierPusher]: treesize reduction 12, result has 95.7 percent of original size [2021-11-03 05:00:57,714 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 267 [2021-11-03 05:00:57,718 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:57,741 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:57,742 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:57,743 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:57,743 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:57,744 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:57,746 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:57,750 INFO L180 QuantifierPusher]: treesize reduction 30, result has 67.0 percent of original size [2021-11-03 05:00:57,751 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 52 [2021-11-03 05:00:57,756 INFO L180 QuantifierPusher]: treesize reduction 31, result has 74.8 percent of original size [2021-11-03 05:00:57,758 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 90 [2021-11-03 05:00:57,761 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:57,769 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:57,770 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:57,770 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:57,771 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:57,773 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:57,777 INFO L180 QuantifierPusher]: treesize reduction 30, result has 74.1 percent of original size [2021-11-03 05:00:57,779 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 80 [2021-11-03 05:00:57,784 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 05:00:58,348 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 05:00:58,348 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 05:00:58,348 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 10 [2021-11-03 05:00:58,348 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1838902876] [2021-11-03 05:00:58,349 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-03 05:00:58,349 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:00:58,349 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-03 05:00:58,349 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=270, Unknown=0, NotChecked=0, Total=342 [2021-11-03 05:00:58,349 INFO L87 Difference]: Start difference. First operand 31 states and 38 transitions. Second operand has 11 states, 11 states have (on average 2.909090909090909) internal successors, (32), 10 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) [2021-11-03 05:00:58,477 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:00:58,477 INFO L93 Difference]: Finished difference Result 42 states and 49 transitions. [2021-11-03 05:00:58,477 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-03 05:00:58,478 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.909090909090909) internal successors, (32), 10 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) Word has length 25 [2021-11-03 05:00:58,478 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:00:58,478 INFO L225 Difference]: With dead ends: 42 [2021-11-03 05:00:58,478 INFO L226 Difference]: Without dead ends: 40 [2021-11-03 05:00:58,478 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 66 SyntacticMatches, 2 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 164 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=145, Invalid=505, Unknown=0, NotChecked=0, Total=650 [2021-11-03 05:00:58,479 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2021-11-03 05:00:58,483 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 34. [2021-11-03 05:00:58,483 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 33 states have (on average 1.2424242424242424) internal successors, (41), 33 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:00:58,483 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 41 transitions. [2021-11-03 05:00:58,483 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 41 transitions. Word has length 25 [2021-11-03 05:00:58,483 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:00:58,484 INFO L470 AbstractCegarLoop]: Abstraction has 34 states and 41 transitions. [2021-11-03 05:00:58,484 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 2.909090909090909) internal successors, (32), 10 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) [2021-11-03 05:00:58,484 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 41 transitions. [2021-11-03 05:00:58,484 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-11-03 05:00:58,484 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:00:58,485 INFO L513 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:00:58,523 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-11-03 05:00:58,701 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable457,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:00:58,701 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:00:58,701 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:00:58,701 INFO L85 PathProgramCache]: Analyzing trace with hash -609465343, now seen corresponding path program 9 times [2021-11-03 05:00:58,701 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:00:58,701 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1410224137] [2021-11-03 05:00:58,702 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:00:58,702 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:00:58,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:00:58,828 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 27 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:00:58,828 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:00:58,828 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1410224137] [2021-11-03 05:00:58,828 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1410224137] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 05:00:58,828 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [689100353] [2021-11-03 05:00:58,828 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-03 05:00:58,828 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:00:58,828 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 05:00:58,833 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 05:00:58,859 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-11-03 05:00:59,177 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-03 05:00:59,177 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 05:00:59,178 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-03 05:00:59,179 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:00:59,580 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 40 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:00:59,580 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:00:59,691 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 40 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:00:59,692 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [689100353] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 05:00:59,692 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [720627685] [2021-11-03 05:00:59,693 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-03 05:00:59,693 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 05:00:59,693 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 05:00:59,693 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 05:00:59,694 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 05:00:59,696 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:59,697 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:00:59,698 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:59,698 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 05:00:59,698 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:00:59,699 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:59,699 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 05:00:59,700 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 111 [2021-11-03 05:00:59,702 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_26|], 10=[|v_#valid_27|]} [2021-11-03 05:00:59,708 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:00:59,709 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 [2021-11-03 05:00:59,709 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:59,710 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:00:59,710 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:59,710 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:00:59,711 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 05:00:59,711 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:59,713 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:59,716 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:00:59,717 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:00:59,718 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:00:59,722 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:00:59,724 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 [2021-11-03 05:00:59,724 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:59,726 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:00:59,726 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:59,727 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:00:59,727 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 05:00:59,727 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:59,729 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:59,730 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:59,731 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 05:00:59,732 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 05:00:59,732 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:108, output treesize:93 [2021-11-03 05:00:59,737 INFO L180 QuantifierPusher]: treesize reduction 17, result has 86.9 percent of original size [2021-11-03 05:00:59,739 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 108 [2021-11-03 05:00:59,740 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:59,745 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:59,749 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:59,759 INFO L180 QuantifierPusher]: treesize reduction 17, result has 94.1 percent of original size [2021-11-03 05:00:59,762 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 269 [2021-11-03 05:00:59,765 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:59,778 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:59,779 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:59,779 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:59,780 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:59,781 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:59,783 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:59,787 INFO L180 QuantifierPusher]: treesize reduction 30, result has 67.0 percent of original size [2021-11-03 05:00:59,789 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 52 [2021-11-03 05:00:59,794 INFO L180 QuantifierPusher]: treesize reduction 31, result has 74.8 percent of original size [2021-11-03 05:00:59,796 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 87 [2021-11-03 05:00:59,798 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:59,804 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:59,809 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:59,810 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:59,811 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:59,814 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:59,820 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:00:59,822 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 138 [2021-11-03 05:00:59,825 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:59,834 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:59,835 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:59,835 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:59,837 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:59,838 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:59,839 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:59,839 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:59,842 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:00:59,847 INFO L180 QuantifierPusher]: treesize reduction 30, result has 74.1 percent of original size [2021-11-03 05:00:59,848 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 80 [2021-11-03 05:00:59,858 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 05:01:00,555 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 05:01:00,555 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 05:01:00,555 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 29 [2021-11-03 05:01:00,555 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1406992756] [2021-11-03 05:01:00,556 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2021-11-03 05:01:00,556 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:01:00,556 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-11-03 05:01:00,557 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=214, Invalid=1192, Unknown=0, NotChecked=0, Total=1406 [2021-11-03 05:01:00,557 INFO L87 Difference]: Start difference. First operand 34 states and 41 transitions. Second operand has 30 states, 30 states have (on average 2.0) internal successors, (60), 29 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) [2021-11-03 05:01:00,872 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:01:00,872 INFO L93 Difference]: Finished difference Result 80 states and 89 transitions. [2021-11-03 05:01:00,872 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-03 05:01:00,872 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 2.0) internal successors, (60), 29 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) Word has length 28 [2021-11-03 05:01:00,872 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:01:00,873 INFO L225 Difference]: With dead ends: 80 [2021-11-03 05:01:00,873 INFO L226 Difference]: Without dead ends: 59 [2021-11-03 05:01:00,874 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 60 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 787 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=391, Invalid=2059, Unknown=0, NotChecked=0, Total=2450 [2021-11-03 05:01:00,874 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2021-11-03 05:01:00,881 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 35. [2021-11-03 05:01:00,881 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 34 states have (on average 1.2352941176470589) internal successors, (42), 34 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:01:00,881 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 42 transitions. [2021-11-03 05:01:00,881 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 42 transitions. Word has length 28 [2021-11-03 05:01:00,881 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:01:00,881 INFO L470 AbstractCegarLoop]: Abstraction has 35 states and 42 transitions. [2021-11-03 05:01:00,881 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 30 states have (on average 2.0) internal successors, (60), 29 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) [2021-11-03 05:01:00,882 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 42 transitions. [2021-11-03 05:01:00,882 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-11-03 05:01:00,882 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:01:00,882 INFO L513 BasicCegarLoop]: trace histogram [6, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:01:00,904 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2021-11-03 05:01:01,082 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable476 [2021-11-03 05:01:01,083 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:01:01,083 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:01:01,083 INFO L85 PathProgramCache]: Analyzing trace with hash -1758338926, now seen corresponding path program 7 times [2021-11-03 05:01:01,083 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:01:01,084 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1981691417] [2021-11-03 05:01:01,084 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:01:01,084 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:01:01,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:01:01,216 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 27 proven. 24 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:01:01,217 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:01:01,217 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1981691417] [2021-11-03 05:01:01,217 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1981691417] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 05:01:01,217 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [471262614] [2021-11-03 05:01:01,217 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-03 05:01:01,217 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:01:01,217 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 05:01:01,218 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 05:01:01,219 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2021-11-03 05:01:01,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:01:01,574 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-03 05:01:01,575 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:01:01,904 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 40 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:01:01,904 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:01:01,999 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 40 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:01:01,999 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [471262614] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 05:01:01,999 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1448913046] [2021-11-03 05:01:02,000 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-03 05:01:02,000 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 05:01:02,001 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 05:01:02,001 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 05:01:02,001 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 05:01:02,011 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:02,011 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:01:02,012 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:02,012 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 05:01:02,012 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:01:02,013 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:02,013 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 05:01:02,014 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 111 [2021-11-03 05:01:02,016 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_27|], 10=[|v_#valid_28|]} [2021-11-03 05:01:02,022 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:01:02,023 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 [2021-11-03 05:01:02,023 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:02,024 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:01:02,024 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:02,025 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:01:02,025 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 05:01:02,025 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:02,027 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:02,030 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:01:02,031 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:01:02,032 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:01:02,035 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:01:02,038 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 [2021-11-03 05:01:02,038 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:02,040 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:01:02,040 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:02,040 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:01:02,041 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 05:01:02,041 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:02,043 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:02,044 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:02,045 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 05:01:02,045 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 05:01:02,046 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:108, output treesize:93 [2021-11-03 05:01:02,050 INFO L180 QuantifierPusher]: treesize reduction 16, result has 87.0 percent of original size [2021-11-03 05:01:02,052 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 102 [2021-11-03 05:01:02,055 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:02,060 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:02,067 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:02,076 INFO L180 QuantifierPusher]: treesize reduction 6, result has 97.7 percent of original size [2021-11-03 05:01:02,079 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 251 [2021-11-03 05:01:02,082 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:02,093 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:02,098 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:02,099 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:02,099 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:02,100 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:02,113 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:02,116 INFO L180 QuantifierPusher]: treesize reduction 24, result has 70.7 percent of original size [2021-11-03 05:01:02,117 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 49 [2021-11-03 05:01:02,121 INFO L180 QuantifierPusher]: treesize reduction 25, result has 71.9 percent of original size [2021-11-03 05:01:02,123 INFO L185 QuantifierPusher]: treesize reduction 5, result has 90.6 percent of original size 48 [2021-11-03 05:01:02,125 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:02,129 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:02,133 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:02,141 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:02,144 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 120 [2021-11-03 05:01:02,146 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:02,179 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:02,180 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:02,180 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:02,181 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:02,182 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:02,186 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:02,193 INFO L180 QuantifierPusher]: treesize reduction 24, result has 71.8 percent of original size [2021-11-03 05:01:02,194 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 52 [2021-11-03 05:01:02,199 INFO L180 QuantifierPusher]: treesize reduction 25, result has 78.6 percent of original size [2021-11-03 05:01:02,201 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 90 [2021-11-03 05:01:02,203 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:02,209 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:02,209 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:02,210 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:02,211 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:02,213 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:02,217 INFO L180 QuantifierPusher]: treesize reduction 24, result has 78.2 percent of original size [2021-11-03 05:01:02,219 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 80 [2021-11-03 05:01:02,225 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 05:01:02,910 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 05:01:02,911 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 05:01:02,911 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 28 [2021-11-03 05:01:02,911 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1573407259] [2021-11-03 05:01:02,911 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2021-11-03 05:01:02,911 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:01:02,912 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-11-03 05:01:02,912 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=186, Invalid=1146, Unknown=0, NotChecked=0, Total=1332 [2021-11-03 05:01:02,913 INFO L87 Difference]: Start difference. First operand 35 states and 42 transitions. Second operand has 29 states, 29 states have (on average 2.0689655172413794) internal successors, (60), 28 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) [2021-11-03 05:01:03,203 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:01:03,203 INFO L93 Difference]: Finished difference Result 104 states and 114 transitions. [2021-11-03 05:01:03,204 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-11-03 05:01:03,204 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 2.0689655172413794) internal successors, (60), 28 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) Word has length 28 [2021-11-03 05:01:03,204 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:01:03,205 INFO L225 Difference]: With dead ends: 104 [2021-11-03 05:01:03,205 INFO L226 Difference]: Without dead ends: 83 [2021-11-03 05:01:03,207 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 61 SyntacticMatches, 0 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 876 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=412, Invalid=2344, Unknown=0, NotChecked=0, Total=2756 [2021-11-03 05:01:03,208 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2021-11-03 05:01:03,213 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 35. [2021-11-03 05:01:03,213 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 34 states have (on average 1.2352941176470589) internal successors, (42), 34 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:01:03,214 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 42 transitions. [2021-11-03 05:01:03,214 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 42 transitions. Word has length 28 [2021-11-03 05:01:03,214 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:01:03,214 INFO L470 AbstractCegarLoop]: Abstraction has 35 states and 42 transitions. [2021-11-03 05:01:03,214 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 2.0689655172413794) internal successors, (60), 28 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) [2021-11-03 05:01:03,214 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 42 transitions. [2021-11-03 05:01:03,214 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-11-03 05:01:03,215 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:01:03,215 INFO L513 BasicCegarLoop]: trace histogram [6, 5, 5, 3, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:01:03,236 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Ended with exit code 0 [2021-11-03 05:01:03,417 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable504,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:01:03,417 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:01:03,417 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:01:03,417 INFO L85 PathProgramCache]: Analyzing trace with hash -548473375, now seen corresponding path program 8 times [2021-11-03 05:01:03,417 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:01:03,417 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1608568870] [2021-11-03 05:01:03,417 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:01:03,417 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:01:03,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:01:03,530 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 27 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:01:03,530 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:01:03,530 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1608568870] [2021-11-03 05:01:03,531 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1608568870] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 05:01:03,531 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [632402167] [2021-11-03 05:01:03,531 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-03 05:01:03,531 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:01:03,531 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 05:01:03,548 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 05:01:03,550 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-11-03 05:01:03,932 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-11-03 05:01:03,932 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 05:01:03,933 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-03 05:01:03,934 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:01:04,304 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 40 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:01:04,304 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:01:04,400 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 40 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:01:04,400 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [632402167] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 05:01:04,401 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [918327252] [2021-11-03 05:01:04,401 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-03 05:01:04,402 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 05:01:04,402 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 05:01:04,402 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 05:01:04,402 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 05:01:04,418 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:04,419 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:01:04,419 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:04,420 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 05:01:04,420 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:01:04,421 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:04,424 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 05:01:04,426 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 111 [2021-11-03 05:01:04,429 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_28|], 10=[|v_#valid_29|]} [2021-11-03 05:01:04,435 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:01:04,436 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 [2021-11-03 05:01:04,437 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:04,437 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:01:04,438 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:04,438 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:01:04,438 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 05:01:04,439 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:04,441 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:04,444 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:01:04,446 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:01:04,447 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:01:04,450 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:01:04,453 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 [2021-11-03 05:01:04,454 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:04,455 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:01:04,456 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:04,456 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:01:04,456 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 05:01:04,457 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:04,459 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:04,460 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:04,462 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 05:01:04,462 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 05:01:04,462 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:108, output treesize:93 [2021-11-03 05:01:04,467 INFO L180 QuantifierPusher]: treesize reduction 16, result has 87.0 percent of original size [2021-11-03 05:01:04,470 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 102 [2021-11-03 05:01:04,472 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:04,479 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:04,487 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:04,503 INFO L180 QuantifierPusher]: treesize reduction 6, result has 97.7 percent of original size [2021-11-03 05:01:04,506 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 251 [2021-11-03 05:01:04,509 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:04,520 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:04,521 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:04,522 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:04,522 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:04,523 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:04,525 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:04,528 INFO L180 QuantifierPusher]: treesize reduction 24, result has 70.7 percent of original size [2021-11-03 05:01:04,530 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 49 [2021-11-03 05:01:04,534 INFO L180 QuantifierPusher]: treesize reduction 25, result has 71.9 percent of original size [2021-11-03 05:01:04,535 INFO L185 QuantifierPusher]: treesize reduction 5, result has 90.6 percent of original size 48 [2021-11-03 05:01:04,537 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:04,541 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:04,546 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:04,551 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:04,552 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 120 [2021-11-03 05:01:04,554 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:04,560 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:04,560 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:04,561 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:04,563 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:04,564 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:04,566 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:04,568 INFO L180 QuantifierPusher]: treesize reduction 24, result has 71.8 percent of original size [2021-11-03 05:01:04,569 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 52 [2021-11-03 05:01:04,573 INFO L180 QuantifierPusher]: treesize reduction 25, result has 78.6 percent of original size [2021-11-03 05:01:04,574 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 90 [2021-11-03 05:01:04,576 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:04,581 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:04,582 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:04,582 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:04,583 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:04,584 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:04,587 INFO L180 QuantifierPusher]: treesize reduction 24, result has 78.2 percent of original size [2021-11-03 05:01:04,588 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 80 [2021-11-03 05:01:04,592 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 05:01:05,182 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 05:01:05,182 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 05:01:05,182 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 27 [2021-11-03 05:01:05,182 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1001457388] [2021-11-03 05:01:05,182 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2021-11-03 05:01:05,183 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:01:05,183 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-11-03 05:01:05,183 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=174, Invalid=1086, Unknown=0, NotChecked=0, Total=1260 [2021-11-03 05:01:05,184 INFO L87 Difference]: Start difference. First operand 35 states and 42 transitions. Second operand has 28 states, 28 states have (on average 2.107142857142857) internal successors, (59), 27 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) [2021-11-03 05:01:05,553 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:01:05,553 INFO L93 Difference]: Finished difference Result 127 states and 138 transitions. [2021-11-03 05:01:05,553 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-11-03 05:01:05,553 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 2.107142857142857) internal successors, (59), 27 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 28 [2021-11-03 05:01:05,553 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:01:05,554 INFO L225 Difference]: With dead ends: 127 [2021-11-03 05:01:05,554 INFO L226 Difference]: Without dead ends: 106 [2021-11-03 05:01:05,555 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 62 SyntacticMatches, 0 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 895 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=426, Invalid=2436, Unknown=0, NotChecked=0, Total=2862 [2021-11-03 05:01:05,556 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2021-11-03 05:01:05,564 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 35. [2021-11-03 05:01:05,565 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 34 states have (on average 1.2352941176470589) internal successors, (42), 34 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:01:05,565 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 42 transitions. [2021-11-03 05:01:05,565 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 42 transitions. Word has length 28 [2021-11-03 05:01:05,565 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:01:05,565 INFO L470 AbstractCegarLoop]: Abstraction has 35 states and 42 transitions. [2021-11-03 05:01:05,565 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 2.107142857142857) internal successors, (59), 27 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) [2021-11-03 05:01:05,566 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 42 transitions. [2021-11-03 05:01:05,566 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-11-03 05:01:05,566 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:01:05,566 INFO L513 BasicCegarLoop]: trace histogram [6, 5, 5, 3, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:01:05,602 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2021-11-03 05:01:05,766 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable533 [2021-11-03 05:01:05,767 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:01:05,767 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:01:05,767 INFO L85 PathProgramCache]: Analyzing trace with hash -509445454, now seen corresponding path program 9 times [2021-11-03 05:01:05,767 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:01:05,767 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [764803448] [2021-11-03 05:01:05,767 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:01:05,767 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:01:05,777 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:01:05,888 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 27 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:01:05,888 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:01:05,888 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [764803448] [2021-11-03 05:01:05,888 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [764803448] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 05:01:05,888 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [442420771] [2021-11-03 05:01:05,888 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-03 05:01:05,888 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:01:05,888 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 05:01:05,889 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 05:01:05,890 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2021-11-03 05:01:06,296 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-03 05:01:06,296 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 05:01:06,297 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-03 05:01:06,298 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:01:06,587 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 40 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:01:06,587 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:01:06,687 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 40 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:01:06,687 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [442420771] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 05:01:06,688 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1712630046] [2021-11-03 05:01:06,689 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-03 05:01:06,689 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 05:01:06,689 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 05:01:06,689 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 05:01:06,690 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 05:01:06,692 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:06,693 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:01:06,693 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:06,704 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 05:01:06,704 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:01:06,705 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:06,705 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 05:01:06,706 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 111 [2021-11-03 05:01:06,708 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_29|], 10=[|v_#valid_30|]} [2021-11-03 05:01:06,714 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:01:06,715 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 [2021-11-03 05:01:06,715 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:06,716 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:01:06,716 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:06,717 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:01:06,717 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 05:01:06,717 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:06,719 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:06,722 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:01:06,723 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:01:06,724 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:01:06,727 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:01:06,728 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 [2021-11-03 05:01:06,729 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:06,730 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:01:06,731 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:06,731 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:01:06,731 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 05:01:06,732 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:06,734 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:06,735 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:06,736 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 05:01:06,736 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 05:01:06,736 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:108, output treesize:93 [2021-11-03 05:01:06,741 INFO L180 QuantifierPusher]: treesize reduction 16, result has 87.0 percent of original size [2021-11-03 05:01:06,743 INFO L185 QuantifierPusher]: treesize reduction 5, result has 94.8 percent of original size 91 [2021-11-03 05:01:06,745 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:06,751 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:06,757 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:06,772 INFO L180 QuantifierPusher]: treesize reduction 6, result has 97.7 percent of original size [2021-11-03 05:01:06,777 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 249 [2021-11-03 05:01:06,781 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:06,798 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:06,799 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:06,800 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:06,800 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:06,801 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:06,803 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:06,805 INFO L180 QuantifierPusher]: treesize reduction 24, result has 70.7 percent of original size [2021-11-03 05:01:06,806 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 49 [2021-11-03 05:01:06,809 INFO L180 QuantifierPusher]: treesize reduction 25, result has 71.9 percent of original size [2021-11-03 05:01:06,811 INFO L185 QuantifierPusher]: treesize reduction 5, result has 90.6 percent of original size 48 [2021-11-03 05:01:06,812 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:06,814 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:06,817 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:06,823 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:06,824 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 120 [2021-11-03 05:01:06,826 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:06,831 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:06,832 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:06,832 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:06,833 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:06,833 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:06,834 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:06,836 INFO L180 QuantifierPusher]: treesize reduction 24, result has 71.8 percent of original size [2021-11-03 05:01:06,837 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 52 [2021-11-03 05:01:06,841 INFO L180 QuantifierPusher]: treesize reduction 25, result has 78.6 percent of original size [2021-11-03 05:01:06,844 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 87 [2021-11-03 05:01:06,846 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:06,850 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:06,851 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:06,852 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:06,852 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:06,854 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:06,858 INFO L180 QuantifierPusher]: treesize reduction 24, result has 78.2 percent of original size [2021-11-03 05:01:06,860 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 80 [2021-11-03 05:01:06,865 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 05:01:07,485 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 05:01:07,485 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 05:01:07,485 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 26 [2021-11-03 05:01:07,485 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1833863475] [2021-11-03 05:01:07,485 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-11-03 05:01:07,485 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:01:07,486 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-11-03 05:01:07,486 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=166, Invalid=1024, Unknown=0, NotChecked=0, Total=1190 [2021-11-03 05:01:07,486 INFO L87 Difference]: Start difference. First operand 35 states and 42 transitions. Second operand has 27 states, 27 states have (on average 2.1481481481481484) internal successors, (58), 26 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) [2021-11-03 05:01:07,820 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:01:07,821 INFO L93 Difference]: Finished difference Result 149 states and 161 transitions. [2021-11-03 05:01:07,821 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-11-03 05:01:07,821 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 2.1481481481481484) internal successors, (58), 26 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 28 [2021-11-03 05:01:07,821 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:01:07,822 INFO L225 Difference]: With dead ends: 149 [2021-11-03 05:01:07,822 INFO L226 Difference]: Without dead ends: 128 [2021-11-03 05:01:07,823 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 63 SyntacticMatches, 0 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 839 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=412, Invalid=2344, Unknown=0, NotChecked=0, Total=2756 [2021-11-03 05:01:07,823 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2021-11-03 05:01:07,829 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 35. [2021-11-03 05:01:07,829 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 34 states have (on average 1.2352941176470589) internal successors, (42), 34 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:01:07,830 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 42 transitions. [2021-11-03 05:01:07,830 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 42 transitions. Word has length 28 [2021-11-03 05:01:07,830 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:01:07,830 INFO L470 AbstractCegarLoop]: Abstraction has 35 states and 42 transitions. [2021-11-03 05:01:07,831 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 2.1481481481481484) internal successors, (58), 26 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) [2021-11-03 05:01:07,831 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 42 transitions. [2021-11-03 05:01:07,831 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-11-03 05:01:07,831 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:01:07,831 INFO L513 BasicCegarLoop]: trace histogram [6, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:01:07,853 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2021-11-03 05:01:08,033 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable562,24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:01:08,033 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:01:08,033 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:01:08,033 INFO L85 PathProgramCache]: Analyzing trace with hash 1431476161, now seen corresponding path program 10 times [2021-11-03 05:01:08,033 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:01:08,033 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [290095180] [2021-11-03 05:01:08,034 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:01:08,034 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:01:08,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:01:08,154 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 27 proven. 24 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:01:08,154 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:01:08,154 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [290095180] [2021-11-03 05:01:08,154 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [290095180] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 05:01:08,154 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1880070357] [2021-11-03 05:01:08,154 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-03 05:01:08,155 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:01:08,155 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 05:01:08,157 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 05:01:08,180 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2021-11-03 05:01:08,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:01:08,740 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-03 05:01:08,741 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:01:09,042 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 40 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:01:09,042 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:01:09,152 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 40 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:01:09,152 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1880070357] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 05:01:09,153 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1825862563] [2021-11-03 05:01:09,158 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-03 05:01:09,158 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 05:01:09,159 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 05:01:09,159 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 05:01:09,160 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 05:01:09,162 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:09,164 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:01:09,165 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:09,165 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 05:01:09,165 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:01:09,166 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:09,166 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 05:01:09,167 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 111 [2021-11-03 05:01:09,169 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_30|], 10=[|v_#valid_31|]} [2021-11-03 05:01:09,173 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:01:09,174 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 [2021-11-03 05:01:09,175 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:09,175 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:01:09,175 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:09,176 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:01:09,176 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 05:01:09,176 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:09,178 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:09,181 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:01:09,181 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:01:09,182 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:01:09,185 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:01:09,186 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 [2021-11-03 05:01:09,187 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:09,188 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:01:09,188 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:09,189 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:01:09,189 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 05:01:09,189 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:09,191 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:09,192 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:09,193 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 05:01:09,193 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 05:01:09,193 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:108, output treesize:93 [2021-11-03 05:01:09,198 INFO L180 QuantifierPusher]: treesize reduction 16, result has 87.0 percent of original size [2021-11-03 05:01:09,199 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 100 [2021-11-03 05:01:09,202 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:09,207 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:09,213 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:09,227 INFO L180 QuantifierPusher]: treesize reduction 11, result has 95.8 percent of original size [2021-11-03 05:01:09,231 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 251 [2021-11-03 05:01:09,235 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:09,251 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:09,252 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:09,252 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:09,253 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:09,254 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:09,256 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:09,258 INFO L180 QuantifierPusher]: treesize reduction 24, result has 70.7 percent of original size [2021-11-03 05:01:09,260 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 49 [2021-11-03 05:01:09,263 INFO L180 QuantifierPusher]: treesize reduction 25, result has 71.9 percent of original size [2021-11-03 05:01:09,265 INFO L185 QuantifierPusher]: treesize reduction 5, result has 90.6 percent of original size 48 [2021-11-03 05:01:09,266 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:09,270 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:09,274 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:09,282 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:09,284 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 120 [2021-11-03 05:01:09,286 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:09,309 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:09,309 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:09,310 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:09,310 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:09,311 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:09,312 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:09,314 INFO L180 QuantifierPusher]: treesize reduction 24, result has 71.8 percent of original size [2021-11-03 05:01:09,315 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 52 [2021-11-03 05:01:09,318 INFO L180 QuantifierPusher]: treesize reduction 25, result has 78.6 percent of original size [2021-11-03 05:01:09,319 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 87 [2021-11-03 05:01:09,321 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:09,325 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:09,325 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:09,326 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:09,326 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:09,327 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:09,330 INFO L180 QuantifierPusher]: treesize reduction 24, result has 78.2 percent of original size [2021-11-03 05:01:09,334 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 80 [2021-11-03 05:01:09,338 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 05:01:10,037 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 05:01:10,038 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 05:01:10,038 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 25 [2021-11-03 05:01:10,038 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1038177] [2021-11-03 05:01:10,038 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-03 05:01:10,038 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:01:10,038 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-03 05:01:10,039 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=162, Invalid=960, Unknown=0, NotChecked=0, Total=1122 [2021-11-03 05:01:10,039 INFO L87 Difference]: Start difference. First operand 35 states and 42 transitions. Second operand has 26 states, 26 states have (on average 2.1923076923076925) internal successors, (57), 25 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:01:10,356 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:01:10,356 INFO L93 Difference]: Finished difference Result 170 states and 183 transitions. [2021-11-03 05:01:10,356 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-11-03 05:01:10,356 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 2.1923076923076925) internal successors, (57), 25 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 28 [2021-11-03 05:01:10,356 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:01:10,357 INFO L225 Difference]: With dead ends: 170 [2021-11-03 05:01:10,357 INFO L226 Difference]: Without dead ends: 149 [2021-11-03 05:01:10,358 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 64 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 705 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=373, Invalid=2077, Unknown=0, NotChecked=0, Total=2450 [2021-11-03 05:01:10,358 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 149 states. [2021-11-03 05:01:10,366 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 149 to 35. [2021-11-03 05:01:10,366 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 34 states have (on average 1.2352941176470589) internal successors, (42), 34 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:01:10,366 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 42 transitions. [2021-11-03 05:01:10,366 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 42 transitions. Word has length 28 [2021-11-03 05:01:10,366 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:01:10,366 INFO L470 AbstractCegarLoop]: Abstraction has 35 states and 42 transitions. [2021-11-03 05:01:10,367 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 2.1923076923076925) internal successors, (57), 25 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:01:10,367 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 42 transitions. [2021-11-03 05:01:10,367 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-11-03 05:01:10,367 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:01:10,367 INFO L513 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:01:10,389 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Ended with exit code 0 [2021-11-03 05:01:10,568 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable591,25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:01:10,568 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:01:10,568 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:01:10,568 INFO L85 PathProgramCache]: Analyzing trace with hash -307028782, now seen corresponding path program 5 times [2021-11-03 05:01:10,568 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:01:10,569 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [757384461] [2021-11-03 05:01:10,569 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:01:10,569 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:01:10,578 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:01:10,690 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 27 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:01:10,691 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:01:10,691 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [757384461] [2021-11-03 05:01:10,691 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [757384461] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 05:01:10,691 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1924308933] [2021-11-03 05:01:10,691 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-03 05:01:10,692 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:01:10,692 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 05:01:10,693 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 05:01:10,706 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2021-11-03 05:01:11,166 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-11-03 05:01:11,167 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 05:01:11,167 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-03 05:01:11,168 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:01:11,427 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 40 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:01:11,428 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:01:11,513 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 40 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:01:11,513 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1924308933] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 05:01:11,513 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1583541834] [2021-11-03 05:01:11,514 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-03 05:01:11,514 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 05:01:11,514 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 05:01:11,514 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 05:01:11,514 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 05:01:11,527 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:11,528 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:01:11,528 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:11,528 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 05:01:11,528 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:01:11,529 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:11,529 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 05:01:11,530 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 111 [2021-11-03 05:01:11,539 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_31|], 10=[|v_#valid_32|]} [2021-11-03 05:01:11,543 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:01:11,544 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 [2021-11-03 05:01:11,545 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:11,545 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:01:11,545 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:11,546 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:01:11,546 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 05:01:11,546 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:11,547 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:11,550 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:01:11,550 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:01:11,551 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:01:11,554 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:01:11,555 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 [2021-11-03 05:01:11,555 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:11,556 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:01:11,557 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:11,557 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:01:11,557 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 05:01:11,557 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:11,559 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:11,559 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:11,560 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 05:01:11,560 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 05:01:11,560 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:108, output treesize:93 [2021-11-03 05:01:11,563 INFO L180 QuantifierPusher]: treesize reduction 16, result has 87.0 percent of original size [2021-11-03 05:01:11,574 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 100 [2021-11-03 05:01:11,576 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:11,582 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:11,588 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:11,603 INFO L180 QuantifierPusher]: treesize reduction 11, result has 95.8 percent of original size [2021-11-03 05:01:11,607 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 251 [2021-11-03 05:01:11,612 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:11,629 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:11,629 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:11,630 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:11,631 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:11,631 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:11,633 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:11,637 INFO L180 QuantifierPusher]: treesize reduction 24, result has 70.7 percent of original size [2021-11-03 05:01:11,638 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 49 [2021-11-03 05:01:11,644 INFO L180 QuantifierPusher]: treesize reduction 26, result has 78.5 percent of original size [2021-11-03 05:01:11,646 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 05:01:11,648 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:11,654 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:11,655 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:11,655 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:11,656 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:11,658 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:11,662 INFO L180 QuantifierPusher]: treesize reduction 30, result has 74.1 percent of original size [2021-11-03 05:01:11,664 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 80 [2021-11-03 05:01:11,669 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 05:01:12,378 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 05:01:12,378 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 05:01:12,378 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 24 [2021-11-03 05:01:12,379 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1885122811] [2021-11-03 05:01:12,379 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-11-03 05:01:12,379 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:01:12,379 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-11-03 05:01:12,380 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=161, Invalid=895, Unknown=0, NotChecked=0, Total=1056 [2021-11-03 05:01:12,380 INFO L87 Difference]: Start difference. First operand 35 states and 42 transitions. Second operand has 25 states, 25 states have (on average 2.2) internal successors, (55), 24 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) [2021-11-03 05:01:12,715 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:01:12,715 INFO L93 Difference]: Finished difference Result 192 states and 207 transitions. [2021-11-03 05:01:12,716 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-11-03 05:01:12,716 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 2.2) internal successors, (55), 24 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 28 [2021-11-03 05:01:12,716 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:01:12,717 INFO L225 Difference]: With dead ends: 192 [2021-11-03 05:01:12,717 INFO L226 Difference]: Without dead ends: 171 [2021-11-03 05:01:12,718 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 65 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 533 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=323, Invalid=1657, Unknown=0, NotChecked=0, Total=1980 [2021-11-03 05:01:12,719 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 171 states. [2021-11-03 05:01:12,730 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 171 to 36. [2021-11-03 05:01:12,730 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 35 states have (on average 1.2571428571428571) internal successors, (44), 35 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) [2021-11-03 05:01:12,731 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 44 transitions. [2021-11-03 05:01:12,731 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 44 transitions. Word has length 28 [2021-11-03 05:01:12,731 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:01:12,731 INFO L470 AbstractCegarLoop]: Abstraction has 36 states and 44 transitions. [2021-11-03 05:01:12,731 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 2.2) internal successors, (55), 24 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) [2021-11-03 05:01:12,732 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 44 transitions. [2021-11-03 05:01:12,732 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-11-03 05:01:12,732 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:01:12,732 INFO L513 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:01:12,771 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2021-11-03 05:01:12,941 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable620 [2021-11-03 05:01:12,941 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:01:12,941 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:01:12,941 INFO L85 PathProgramCache]: Analyzing trace with hash -494677627, now seen corresponding path program 10 times [2021-11-03 05:01:12,941 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:01:12,941 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [600955581] [2021-11-03 05:01:12,942 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:01:12,942 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:01:12,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:01:13,043 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 15 proven. 46 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:01:13,044 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:01:13,044 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [600955581] [2021-11-03 05:01:13,044 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [600955581] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 05:01:13,044 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1425819386] [2021-11-03 05:01:13,044 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-03 05:01:13,044 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:01:13,045 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 05:01:13,049 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 05:01:13,068 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2021-11-03 05:01:13,556 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:01:13,557 INFO L263 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-03 05:01:13,558 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:01:13,648 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 21 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:01:13,648 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:01:13,728 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 21 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:01:13,728 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1425819386] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 05:01:13,728 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [780697898] [2021-11-03 05:01:13,729 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-03 05:01:13,730 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 05:01:13,730 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 05:01:13,730 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 05:01:13,730 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 05:01:13,734 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:13,737 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:01:13,745 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:13,745 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 05:01:13,746 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:01:13,746 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:13,747 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 05:01:13,748 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 111 [2021-11-03 05:01:13,750 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_32|], 10=[|v_#valid_33|]} [2021-11-03 05:01:13,755 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:01:13,756 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 [2021-11-03 05:01:13,757 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:13,757 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:01:13,758 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:13,758 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:01:13,758 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 05:01:13,759 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:13,761 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:13,764 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:01:13,765 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:01:13,765 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:01:13,769 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:01:13,770 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 [2021-11-03 05:01:13,771 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:13,772 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:01:13,773 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:13,773 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:01:13,773 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 05:01:13,774 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:13,776 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:13,777 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:13,777 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 05:01:13,778 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 05:01:13,778 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:108, output treesize:93 [2021-11-03 05:01:13,785 INFO L180 QuantifierPusher]: treesize reduction 17, result has 86.9 percent of original size [2021-11-03 05:01:13,787 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 108 [2021-11-03 05:01:13,789 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:13,795 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:13,802 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:13,817 INFO L180 QuantifierPusher]: treesize reduction 17, result has 94.1 percent of original size [2021-11-03 05:01:13,822 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 269 [2021-11-03 05:01:13,826 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:13,844 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:13,845 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:13,846 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:13,846 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:13,847 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:13,852 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:13,856 INFO L180 QuantifierPusher]: treesize reduction 30, result has 67.0 percent of original size [2021-11-03 05:01:13,857 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 52 [2021-11-03 05:01:13,862 INFO L180 QuantifierPusher]: treesize reduction 31, result has 74.8 percent of original size [2021-11-03 05:01:13,864 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 90 [2021-11-03 05:01:13,865 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:13,869 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:13,870 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:13,870 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:13,871 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:13,872 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:13,875 INFO L180 QuantifierPusher]: treesize reduction 30, result has 74.1 percent of original size [2021-11-03 05:01:13,877 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 80 [2021-11-03 05:01:13,882 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 05:01:14,579 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 05:01:14,580 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 05:01:14,580 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 11 [2021-11-03 05:01:14,580 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [73274765] [2021-11-03 05:01:14,581 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-03 05:01:14,581 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:01:14,581 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-03 05:01:14,582 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=300, Unknown=0, NotChecked=0, Total=380 [2021-11-03 05:01:14,582 INFO L87 Difference]: Start difference. First operand 36 states and 44 transitions. Second operand has 12 states, 12 states have (on average 3.0) internal successors, (36), 11 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) [2021-11-03 05:01:14,737 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:01:14,737 INFO L93 Difference]: Finished difference Result 47 states and 55 transitions. [2021-11-03 05:01:14,737 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-03 05:01:14,737 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 3.0) internal successors, (36), 11 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) Word has length 29 [2021-11-03 05:01:14,737 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:01:14,738 INFO L225 Difference]: With dead ends: 47 [2021-11-03 05:01:14,738 INFO L226 Difference]: Without dead ends: 45 [2021-11-03 05:01:14,738 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 79 SyntacticMatches, 2 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 196 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=171, Invalid=585, Unknown=0, NotChecked=0, Total=756 [2021-11-03 05:01:14,739 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2021-11-03 05:01:14,750 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 39. [2021-11-03 05:01:14,750 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 38 states have (on average 1.236842105263158) internal successors, (47), 38 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) [2021-11-03 05:01:14,751 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 47 transitions. [2021-11-03 05:01:14,751 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 47 transitions. Word has length 29 [2021-11-03 05:01:14,751 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:01:14,751 INFO L470 AbstractCegarLoop]: Abstraction has 39 states and 47 transitions. [2021-11-03 05:01:14,752 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 3.0) internal successors, (36), 11 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) [2021-11-03 05:01:14,752 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 47 transitions. [2021-11-03 05:01:14,752 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-11-03 05:01:14,752 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:01:14,752 INFO L513 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:01:14,792 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Forceful destruction successful, exit code 0 [2021-11-03 05:01:14,981 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable639,27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:01:14,981 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:01:14,981 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:01:14,981 INFO L85 PathProgramCache]: Analyzing trace with hash -903550261, now seen corresponding path program 11 times [2021-11-03 05:01:14,981 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:01:14,981 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1208610876] [2021-11-03 05:01:14,981 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:01:14,981 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:01:14,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:01:15,132 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 41 proven. 37 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:01:15,133 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:01:15,133 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1208610876] [2021-11-03 05:01:15,133 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1208610876] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 05:01:15,133 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [777410511] [2021-11-03 05:01:15,133 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-03 05:01:15,133 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:01:15,134 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 05:01:15,134 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 05:01:15,173 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2021-11-03 05:01:15,846 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2021-11-03 05:01:15,846 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 05:01:15,847 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-03 05:01:15,848 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:01:16,239 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 57 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:01:16,239 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:01:16,372 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 57 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:01:16,373 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [777410511] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 05:01:16,373 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [921870103] [2021-11-03 05:01:16,374 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-03 05:01:16,374 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 05:01:16,374 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 05:01:16,374 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 05:01:16,374 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 05:01:16,377 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:16,378 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:01:16,378 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:16,379 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 05:01:16,379 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:01:16,379 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:16,380 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 05:01:16,381 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 111 [2021-11-03 05:01:16,383 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_33|], 10=[|v_#valid_34|]} [2021-11-03 05:01:16,388 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:01:16,389 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 [2021-11-03 05:01:16,389 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:16,390 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:01:16,390 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:16,390 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:01:16,391 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 05:01:16,391 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:16,393 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:16,396 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:01:16,397 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:01:16,398 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:01:16,401 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:01:16,402 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 [2021-11-03 05:01:16,403 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:16,404 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:01:16,405 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:16,405 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:01:16,405 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 05:01:16,406 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:16,408 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:16,409 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:16,410 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 05:01:16,410 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 05:01:16,410 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:108, output treesize:93 [2021-11-03 05:01:16,417 INFO L180 QuantifierPusher]: treesize reduction 17, result has 86.9 percent of original size [2021-11-03 05:01:16,419 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 106 [2021-11-03 05:01:16,421 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:16,427 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:16,434 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:16,444 INFO L180 QuantifierPusher]: treesize reduction 12, result has 95.7 percent of original size [2021-11-03 05:01:16,447 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 269 [2021-11-03 05:01:16,450 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:16,464 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:16,464 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:16,465 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:16,465 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:16,466 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:16,467 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:16,470 INFO L180 QuantifierPusher]: treesize reduction 30, result has 67.0 percent of original size [2021-11-03 05:01:16,471 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 52 [2021-11-03 05:01:16,474 INFO L180 QuantifierPusher]: treesize reduction 31, result has 74.8 percent of original size [2021-11-03 05:01:16,476 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 87 [2021-11-03 05:01:16,478 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:16,482 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:16,483 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:16,483 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:16,484 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:16,490 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:16,496 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:16,499 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 138 [2021-11-03 05:01:16,501 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:16,510 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:16,511 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:16,512 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:16,512 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:16,513 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:16,514 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:16,514 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:16,516 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:16,521 INFO L180 QuantifierPusher]: treesize reduction 30, result has 74.1 percent of original size [2021-11-03 05:01:16,522 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 80 [2021-11-03 05:01:16,525 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 05:01:17,237 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 05:01:17,237 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 05:01:17,237 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 33 [2021-11-03 05:01:17,237 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [846676491] [2021-11-03 05:01:17,238 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-03 05:01:17,238 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:01:17,238 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-03 05:01:17,239 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=262, Invalid=1460, Unknown=0, NotChecked=0, Total=1722 [2021-11-03 05:01:17,239 INFO L87 Difference]: Start difference. First operand 39 states and 47 transitions. Second operand has 34 states, 34 states have (on average 2.0) internal successors, (68), 33 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) [2021-11-03 05:01:17,523 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:01:17,523 INFO L93 Difference]: Finished difference Result 92 states and 102 transitions. [2021-11-03 05:01:17,523 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-03 05:01:17,523 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 2.0) internal successors, (68), 33 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) Word has length 32 [2021-11-03 05:01:17,523 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:01:17,524 INFO L225 Difference]: With dead ends: 92 [2021-11-03 05:01:17,524 INFO L226 Difference]: Without dead ends: 68 [2021-11-03 05:01:17,525 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 70 SyntacticMatches, 0 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1013 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=489, Invalid=2591, Unknown=0, NotChecked=0, Total=3080 [2021-11-03 05:01:17,526 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2021-11-03 05:01:17,536 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 40. [2021-11-03 05:01:17,537 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 39 states have (on average 1.2307692307692308) internal successors, (48), 39 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) [2021-11-03 05:01:17,537 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 48 transitions. [2021-11-03 05:01:17,537 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 48 transitions. Word has length 32 [2021-11-03 05:01:17,537 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:01:17,537 INFO L470 AbstractCegarLoop]: Abstraction has 40 states and 48 transitions. [2021-11-03 05:01:17,537 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 2.0) internal successors, (68), 33 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) [2021-11-03 05:01:17,537 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 48 transitions. [2021-11-03 05:01:17,538 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-11-03 05:01:17,538 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:01:17,538 INFO L513 BasicCegarLoop]: trace histogram [7, 6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:01:17,559 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Ended with exit code 0 [2021-11-03 05:01:17,738 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable658 [2021-11-03 05:01:17,738 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:01:17,738 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:01:17,739 INFO L85 PathProgramCache]: Analyzing trace with hash 1757138652, now seen corresponding path program 11 times [2021-11-03 05:01:17,739 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:01:17,739 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1443094872] [2021-11-03 05:01:17,739 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:01:17,739 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:01:17,747 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:01:17,877 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 41 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:01:17,877 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:01:17,877 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1443094872] [2021-11-03 05:01:17,877 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1443094872] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 05:01:17,877 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [50739109] [2021-11-03 05:01:17,877 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-03 05:01:17,878 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:01:17,878 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 05:01:17,878 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 05:01:17,881 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2021-11-03 05:01:18,416 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2021-11-03 05:01:18,416 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 05:01:18,417 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-03 05:01:18,418 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:01:18,768 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 57 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:01:18,768 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:01:18,866 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 57 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:01:18,866 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [50739109] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 05:01:18,867 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1936000698] [2021-11-03 05:01:18,867 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-03 05:01:18,867 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 05:01:18,868 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 05:01:18,868 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 05:01:18,868 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 05:01:18,872 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:18,872 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:01:18,873 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:18,873 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 05:01:18,873 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:01:18,874 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:18,889 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 05:01:18,890 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 111 [2021-11-03 05:01:18,892 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_34|], 10=[|v_#valid_35|]} [2021-11-03 05:01:18,897 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:01:18,897 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 [2021-11-03 05:01:18,898 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:18,898 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:01:18,902 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:18,902 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:01:18,902 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 05:01:18,903 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:18,904 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:18,906 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:01:18,907 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:01:18,908 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:01:18,910 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:01:18,911 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 [2021-11-03 05:01:18,911 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:18,913 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:01:18,913 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:18,914 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:01:18,914 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 05:01:18,914 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:18,916 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:18,916 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:18,917 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 05:01:18,917 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 05:01:18,917 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:108, output treesize:93 [2021-11-03 05:01:18,920 INFO L180 QuantifierPusher]: treesize reduction 16, result has 87.0 percent of original size [2021-11-03 05:01:18,922 INFO L185 QuantifierPusher]: treesize reduction 5, result has 94.8 percent of original size 91 [2021-11-03 05:01:18,923 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:18,927 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:18,931 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:18,941 INFO L180 QuantifierPusher]: treesize reduction 6, result has 97.7 percent of original size [2021-11-03 05:01:18,943 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 249 [2021-11-03 05:01:18,946 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:18,958 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:18,958 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:18,959 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:18,959 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:18,960 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:18,977 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:18,979 INFO L180 QuantifierPusher]: treesize reduction 24, result has 70.7 percent of original size [2021-11-03 05:01:18,980 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 49 [2021-11-03 05:01:18,983 INFO L180 QuantifierPusher]: treesize reduction 25, result has 71.9 percent of original size [2021-11-03 05:01:18,998 INFO L185 QuantifierPusher]: treesize reduction 5, result has 90.6 percent of original size 48 [2021-11-03 05:01:18,999 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:19,003 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:19,009 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:19,014 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:19,016 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 120 [2021-11-03 05:01:19,017 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:19,023 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:19,023 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:19,024 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:19,024 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:19,024 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:19,026 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:19,028 INFO L180 QuantifierPusher]: treesize reduction 24, result has 71.8 percent of original size [2021-11-03 05:01:19,029 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 52 [2021-11-03 05:01:19,033 INFO L180 QuantifierPusher]: treesize reduction 25, result has 78.6 percent of original size [2021-11-03 05:01:19,035 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 90 [2021-11-03 05:01:19,037 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:19,040 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:19,041 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:19,041 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:19,042 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:19,044 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:19,048 INFO L180 QuantifierPusher]: treesize reduction 24, result has 78.2 percent of original size [2021-11-03 05:01:19,049 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 80 [2021-11-03 05:01:19,054 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 05:01:19,711 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 05:01:19,711 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 05:01:19,711 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 32 [2021-11-03 05:01:19,711 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [131690375] [2021-11-03 05:01:19,711 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2021-11-03 05:01:19,711 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:01:19,712 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-11-03 05:01:19,712 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=231, Invalid=1409, Unknown=0, NotChecked=0, Total=1640 [2021-11-03 05:01:19,712 INFO L87 Difference]: Start difference. First operand 40 states and 48 transitions. Second operand has 33 states, 33 states have (on average 2.0606060606060606) internal successors, (68), 32 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) [2021-11-03 05:01:20,075 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:01:20,075 INFO L93 Difference]: Finished difference Result 120 states and 131 transitions. [2021-11-03 05:01:20,075 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-11-03 05:01:20,075 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 2.0606060606060606) internal successors, (68), 32 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) Word has length 32 [2021-11-03 05:01:20,076 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:01:20,076 INFO L225 Difference]: With dead ends: 120 [2021-11-03 05:01:20,076 INFO L226 Difference]: Without dead ends: 96 [2021-11-03 05:01:20,077 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 129 GetRequests, 71 SyntacticMatches, 0 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1154 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=530, Invalid=3010, Unknown=0, NotChecked=0, Total=3540 [2021-11-03 05:01:20,077 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2021-11-03 05:01:20,087 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 40. [2021-11-03 05:01:20,087 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 39 states have (on average 1.2307692307692308) internal successors, (48), 39 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) [2021-11-03 05:01:20,088 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 48 transitions. [2021-11-03 05:01:20,088 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 48 transitions. Word has length 32 [2021-11-03 05:01:20,088 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:01:20,088 INFO L470 AbstractCegarLoop]: Abstraction has 40 states and 48 transitions. [2021-11-03 05:01:20,088 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 2.0606060606060606) internal successors, (68), 32 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) [2021-11-03 05:01:20,088 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 48 transitions. [2021-11-03 05:01:20,088 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-11-03 05:01:20,088 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:01:20,089 INFO L513 BasicCegarLoop]: trace histogram [7, 6, 6, 4, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:01:20,113 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Forceful destruction successful, exit code 0 [2021-11-03 05:01:20,296 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable686 [2021-11-03 05:01:20,296 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:01:20,296 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:01:20,296 INFO L85 PathProgramCache]: Analyzing trace with hash -2036357973, now seen corresponding path program 12 times [2021-11-03 05:01:20,296 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:01:20,296 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1709553454] [2021-11-03 05:01:20,296 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:01:20,296 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:01:20,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:01:20,423 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 41 proven. 29 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:01:20,423 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:01:20,423 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1709553454] [2021-11-03 05:01:20,423 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1709553454] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 05:01:20,423 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2009102710] [2021-11-03 05:01:20,423 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-03 05:01:20,423 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:01:20,423 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 05:01:20,424 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 05:01:20,425 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2021-11-03 05:01:21,015 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-03 05:01:21,015 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 05:01:21,016 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-03 05:01:21,017 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:01:21,358 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 57 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:01:21,358 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:01:21,470 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 57 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:01:21,470 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2009102710] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 05:01:21,470 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [324057896] [2021-11-03 05:01:21,471 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-03 05:01:21,471 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 05:01:21,471 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 05:01:21,471 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 05:01:21,472 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 05:01:21,475 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:21,475 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:01:21,476 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:21,476 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 05:01:21,476 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:01:21,477 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:21,477 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 05:01:21,478 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 111 [2021-11-03 05:01:21,480 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_35|], 10=[|v_#valid_36|]} [2021-11-03 05:01:21,485 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:01:21,486 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 [2021-11-03 05:01:21,486 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:21,486 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:01:21,487 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:21,487 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:01:21,487 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 05:01:21,488 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:21,490 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:21,492 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:01:21,493 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:01:21,494 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:01:21,497 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:01:21,498 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 [2021-11-03 05:01:21,499 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:21,500 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:01:21,500 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:21,501 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:01:21,501 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 05:01:21,501 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:21,503 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:21,504 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:21,504 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 05:01:21,504 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 05:01:21,505 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:108, output treesize:93 [2021-11-03 05:01:21,508 INFO L180 QuantifierPusher]: treesize reduction 16, result has 87.0 percent of original size [2021-11-03 05:01:21,510 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 102 [2021-11-03 05:01:21,512 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:21,518 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:21,524 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:21,539 INFO L180 QuantifierPusher]: treesize reduction 6, result has 97.7 percent of original size [2021-11-03 05:01:21,543 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 251 [2021-11-03 05:01:21,547 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:21,563 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:21,564 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:21,565 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:21,565 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:21,566 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:21,568 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:21,571 INFO L180 QuantifierPusher]: treesize reduction 24, result has 70.7 percent of original size [2021-11-03 05:01:21,572 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 49 [2021-11-03 05:01:21,576 INFO L180 QuantifierPusher]: treesize reduction 25, result has 71.9 percent of original size [2021-11-03 05:01:21,578 INFO L185 QuantifierPusher]: treesize reduction 5, result has 90.6 percent of original size 48 [2021-11-03 05:01:21,580 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:21,584 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:21,588 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:21,596 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:21,598 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 120 [2021-11-03 05:01:21,600 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:21,609 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:21,609 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:21,610 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:21,611 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:21,611 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:21,613 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:21,616 INFO L180 QuantifierPusher]: treesize reduction 24, result has 71.8 percent of original size [2021-11-03 05:01:21,617 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 52 [2021-11-03 05:01:21,622 INFO L180 QuantifierPusher]: treesize reduction 25, result has 78.6 percent of original size [2021-11-03 05:01:21,624 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 90 [2021-11-03 05:01:21,626 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:21,632 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:21,632 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:21,633 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:21,634 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:21,637 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:21,641 INFO L180 QuantifierPusher]: treesize reduction 24, result has 78.2 percent of original size [2021-11-03 05:01:21,643 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 80 [2021-11-03 05:01:21,648 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 05:01:22,318 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 05:01:22,318 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 05:01:22,318 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 31 [2021-11-03 05:01:22,318 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2016269411] [2021-11-03 05:01:22,319 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-03 05:01:22,319 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:01:22,319 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-03 05:01:22,319 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=216, Invalid=1344, Unknown=0, NotChecked=0, Total=1560 [2021-11-03 05:01:22,319 INFO L87 Difference]: Start difference. First operand 40 states and 48 transitions. Second operand has 32 states, 32 states have (on average 2.09375) internal successors, (67), 31 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) [2021-11-03 05:01:22,777 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:01:22,777 INFO L93 Difference]: Finished difference Result 147 states and 159 transitions. [2021-11-03 05:01:22,777 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-11-03 05:01:22,778 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 2.09375) internal successors, (67), 31 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 32 [2021-11-03 05:01:22,778 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:01:22,778 INFO L225 Difference]: With dead ends: 147 [2021-11-03 05:01:22,778 INFO L226 Difference]: Without dead ends: 123 [2021-11-03 05:01:22,779 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 132 GetRequests, 72 SyntacticMatches, 0 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1219 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=563, Invalid=3219, Unknown=0, NotChecked=0, Total=3782 [2021-11-03 05:01:22,780 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2021-11-03 05:01:22,793 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 40. [2021-11-03 05:01:22,793 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 39 states have (on average 1.2307692307692308) internal successors, (48), 39 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) [2021-11-03 05:01:22,793 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 48 transitions. [2021-11-03 05:01:22,793 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 48 transitions. Word has length 32 [2021-11-03 05:01:22,793 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:01:22,794 INFO L470 AbstractCegarLoop]: Abstraction has 40 states and 48 transitions. [2021-11-03 05:01:22,794 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 2.09375) internal successors, (67), 31 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) [2021-11-03 05:01:22,794 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 48 transitions. [2021-11-03 05:01:22,794 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-11-03 05:01:22,794 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:01:22,795 INFO L513 BasicCegarLoop]: trace histogram [7, 6, 6, 3, 3, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:01:22,828 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Forceful destruction successful, exit code 0 [2021-11-03 05:01:23,009 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable715 [2021-11-03 05:01:23,010 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:01:23,010 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:01:23,010 INFO L85 PathProgramCache]: Analyzing trace with hash 1997691132, now seen corresponding path program 13 times [2021-11-03 05:01:23,010 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:01:23,010 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1394087329] [2021-11-03 05:01:23,010 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:01:23,010 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:01:23,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:01:23,141 INFO L134 CoverageAnalysis]: Checked inductivity of 69 backedges. 41 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:01:23,141 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:01:23,141 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1394087329] [2021-11-03 05:01:23,141 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1394087329] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 05:01:23,141 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1025676971] [2021-11-03 05:01:23,141 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-03 05:01:23,141 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:01:23,141 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 05:01:23,142 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 05:01:23,143 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2021-11-03 05:01:23,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:01:23,740 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-03 05:01:23,741 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:01:24,067 INFO L134 CoverageAnalysis]: Checked inductivity of 69 backedges. 57 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:01:24,067 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:01:24,169 INFO L134 CoverageAnalysis]: Checked inductivity of 69 backedges. 57 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:01:24,170 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1025676971] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 05:01:24,170 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [920408145] [2021-11-03 05:01:24,170 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-03 05:01:24,170 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 05:01:24,171 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 05:01:24,171 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 05:01:24,171 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 05:01:24,174 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:24,174 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:01:24,174 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:24,175 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 05:01:24,175 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:01:24,175 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:24,175 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 05:01:24,176 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 111 [2021-11-03 05:01:24,188 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_36|], 10=[|v_#valid_37|]} [2021-11-03 05:01:24,194 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:01:24,194 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 [2021-11-03 05:01:24,195 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:24,195 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:01:24,196 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:24,196 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:01:24,196 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 05:01:24,197 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:24,199 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:24,202 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:01:24,203 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:01:24,204 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:01:24,207 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:01:24,208 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 [2021-11-03 05:01:24,209 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:24,210 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:01:24,211 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:24,211 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:01:24,211 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 05:01:24,211 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:24,214 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:24,215 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:24,215 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 05:01:24,216 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 05:01:24,216 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:108, output treesize:93 [2021-11-03 05:01:24,221 INFO L180 QuantifierPusher]: treesize reduction 16, result has 87.0 percent of original size [2021-11-03 05:01:24,222 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 100 [2021-11-03 05:01:24,225 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:24,230 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:24,236 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:24,251 INFO L180 QuantifierPusher]: treesize reduction 11, result has 95.8 percent of original size [2021-11-03 05:01:24,255 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 251 [2021-11-03 05:01:24,259 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:24,271 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:24,271 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:24,273 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:24,273 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:24,273 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:24,275 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:24,277 INFO L180 QuantifierPusher]: treesize reduction 24, result has 70.7 percent of original size [2021-11-03 05:01:24,278 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 49 [2021-11-03 05:01:24,280 INFO L180 QuantifierPusher]: treesize reduction 25, result has 71.9 percent of original size [2021-11-03 05:01:24,282 INFO L185 QuantifierPusher]: treesize reduction 5, result has 90.6 percent of original size 48 [2021-11-03 05:01:24,283 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:24,285 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:24,289 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:24,294 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:24,296 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 120 [2021-11-03 05:01:24,298 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:24,303 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:24,303 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:24,304 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:24,304 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:24,305 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:24,308 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:24,310 INFO L180 QuantifierPusher]: treesize reduction 24, result has 71.8 percent of original size [2021-11-03 05:01:24,311 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 52 [2021-11-03 05:01:24,314 INFO L180 QuantifierPusher]: treesize reduction 25, result has 78.6 percent of original size [2021-11-03 05:01:24,315 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 87 [2021-11-03 05:01:24,317 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:24,320 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:24,321 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:24,321 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:24,322 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:24,323 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:24,325 INFO L180 QuantifierPusher]: treesize reduction 24, result has 78.2 percent of original size [2021-11-03 05:01:24,326 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 80 [2021-11-03 05:01:24,330 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 05:01:24,949 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 05:01:24,949 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 05:01:24,949 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 30 [2021-11-03 05:01:24,949 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1931294317] [2021-11-03 05:01:24,950 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2021-11-03 05:01:24,950 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:01:24,950 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-11-03 05:01:24,950 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=205, Invalid=1277, Unknown=0, NotChecked=0, Total=1482 [2021-11-03 05:01:24,950 INFO L87 Difference]: Start difference. First operand 40 states and 48 transitions. Second operand has 31 states, 31 states have (on average 2.129032258064516) internal successors, (66), 30 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) [2021-11-03 05:01:25,374 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:01:25,375 INFO L93 Difference]: Finished difference Result 173 states and 186 transitions. [2021-11-03 05:01:25,375 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-11-03 05:01:25,375 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 2.129032258064516) internal successors, (66), 30 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 32 [2021-11-03 05:01:25,375 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:01:25,376 INFO L225 Difference]: With dead ends: 173 [2021-11-03 05:01:25,376 INFO L226 Difference]: Without dead ends: 149 [2021-11-03 05:01:25,376 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 73 SyntacticMatches, 0 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1197 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=563, Invalid=3219, Unknown=0, NotChecked=0, Total=3782 [2021-11-03 05:01:25,376 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 149 states. [2021-11-03 05:01:25,387 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 149 to 40. [2021-11-03 05:01:25,387 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 39 states have (on average 1.2307692307692308) internal successors, (48), 39 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) [2021-11-03 05:01:25,387 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 48 transitions. [2021-11-03 05:01:25,388 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 48 transitions. Word has length 32 [2021-11-03 05:01:25,388 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:01:25,388 INFO L470 AbstractCegarLoop]: Abstraction has 40 states and 48 transitions. [2021-11-03 05:01:25,388 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 2.129032258064516) internal successors, (66), 30 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) [2021-11-03 05:01:25,388 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 48 transitions. [2021-11-03 05:01:25,388 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-11-03 05:01:25,388 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:01:25,388 INFO L513 BasicCegarLoop]: trace histogram [7, 6, 6, 4, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:01:25,410 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Forceful destruction successful, exit code 0 [2021-11-03 05:01:25,593 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable744,31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:01:25,593 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:01:25,593 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:01:25,593 INFO L85 PathProgramCache]: Analyzing trace with hash 742348427, now seen corresponding path program 14 times [2021-11-03 05:01:25,593 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:01:25,593 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1271278102] [2021-11-03 05:01:25,593 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:01:25,594 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:01:25,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:01:25,729 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 41 proven. 29 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:01:25,730 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:01:25,730 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1271278102] [2021-11-03 05:01:25,730 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1271278102] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 05:01:25,730 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [666745551] [2021-11-03 05:01:25,730 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-03 05:01:25,731 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:01:25,731 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 05:01:25,737 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 05:01:25,768 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2021-11-03 05:01:26,393 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2021-11-03 05:01:26,393 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 05:01:26,394 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-03 05:01:26,395 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:01:26,716 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 57 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:01:26,716 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:01:26,817 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 57 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:01:26,817 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [666745551] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 05:01:26,817 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1904367319] [2021-11-03 05:01:26,818 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-03 05:01:26,819 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 05:01:26,819 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 05:01:26,819 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 05:01:26,819 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 05:01:26,821 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:26,822 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:01:26,822 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:26,822 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 05:01:26,822 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:01:26,822 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:26,823 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 05:01:26,823 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 111 [2021-11-03 05:01:26,825 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_37|], 10=[|v_#valid_38|]} [2021-11-03 05:01:26,829 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:01:26,829 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 [2021-11-03 05:01:26,829 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:26,830 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:01:26,830 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:26,830 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:01:26,830 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 05:01:26,830 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:26,832 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:26,834 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:01:26,835 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:01:26,835 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:01:26,838 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:01:26,841 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 [2021-11-03 05:01:26,841 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:26,842 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:01:26,843 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:26,843 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:01:26,843 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 05:01:26,843 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:26,845 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:26,845 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:26,846 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 05:01:26,846 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 05:01:26,846 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:108, output treesize:93 [2021-11-03 05:01:26,849 INFO L180 QuantifierPusher]: treesize reduction 16, result has 87.0 percent of original size [2021-11-03 05:01:26,851 INFO L185 QuantifierPusher]: treesize reduction 5, result has 94.8 percent of original size 91 [2021-11-03 05:01:26,852 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:26,856 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:26,860 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:26,870 INFO L180 QuantifierPusher]: treesize reduction 6, result has 97.7 percent of original size [2021-11-03 05:01:26,897 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 249 [2021-11-03 05:01:26,899 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:26,911 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:26,911 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:26,912 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:26,912 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:26,912 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:26,920 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:26,922 INFO L180 QuantifierPusher]: treesize reduction 24, result has 70.7 percent of original size [2021-11-03 05:01:26,923 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 49 [2021-11-03 05:01:26,926 INFO L180 QuantifierPusher]: treesize reduction 25, result has 71.9 percent of original size [2021-11-03 05:01:26,927 INFO L185 QuantifierPusher]: treesize reduction 5, result has 90.6 percent of original size 48 [2021-11-03 05:01:26,928 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:26,931 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:26,933 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:26,939 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:26,949 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 120 [2021-11-03 05:01:26,951 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:26,957 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:26,957 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:26,958 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:26,958 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:26,958 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:26,959 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:26,961 INFO L180 QuantifierPusher]: treesize reduction 24, result has 71.8 percent of original size [2021-11-03 05:01:26,962 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 52 [2021-11-03 05:01:26,966 INFO L180 QuantifierPusher]: treesize reduction 25, result has 78.6 percent of original size [2021-11-03 05:01:26,967 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 87 [2021-11-03 05:01:26,968 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:26,972 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:26,972 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:26,973 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:26,973 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:26,975 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:26,978 INFO L180 QuantifierPusher]: treesize reduction 24, result has 78.2 percent of original size [2021-11-03 05:01:26,979 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 80 [2021-11-03 05:01:26,982 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 05:01:27,583 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 05:01:27,583 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 05:01:27,583 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 29 [2021-11-03 05:01:27,583 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1230818002] [2021-11-03 05:01:27,583 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2021-11-03 05:01:27,583 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:01:27,584 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-11-03 05:01:27,584 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=198, Invalid=1208, Unknown=0, NotChecked=0, Total=1406 [2021-11-03 05:01:27,584 INFO L87 Difference]: Start difference. First operand 40 states and 48 transitions. Second operand has 30 states, 30 states have (on average 2.1666666666666665) internal successors, (65), 29 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:01:27,993 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:01:27,993 INFO L93 Difference]: Finished difference Result 198 states and 212 transitions. [2021-11-03 05:01:27,993 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-11-03 05:01:27,993 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 2.1666666666666665) internal successors, (65), 29 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 32 [2021-11-03 05:01:27,994 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:01:27,994 INFO L225 Difference]: With dead ends: 198 [2021-11-03 05:01:27,995 INFO L226 Difference]: Without dead ends: 174 [2021-11-03 05:01:27,995 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 132 GetRequests, 74 SyntacticMatches, 0 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1092 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=530, Invalid=3010, Unknown=0, NotChecked=0, Total=3540 [2021-11-03 05:01:27,996 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 174 states. [2021-11-03 05:01:28,013 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 174 to 40. [2021-11-03 05:01:28,013 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 39 states have (on average 1.2307692307692308) internal successors, (48), 39 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) [2021-11-03 05:01:28,013 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 48 transitions. [2021-11-03 05:01:28,014 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 48 transitions. Word has length 32 [2021-11-03 05:01:28,014 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:01:28,014 INFO L470 AbstractCegarLoop]: Abstraction has 40 states and 48 transitions. [2021-11-03 05:01:28,014 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 30 states have (on average 2.1666666666666665) internal successors, (65), 29 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:01:28,014 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 48 transitions. [2021-11-03 05:01:28,015 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-11-03 05:01:28,015 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:01:28,015 INFO L513 BasicCegarLoop]: trace histogram [7, 6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:01:28,039 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Forceful destruction successful, exit code 0 [2021-11-03 05:01:28,225 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable773 [2021-11-03 05:01:28,225 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:01:28,225 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:01:28,225 INFO L85 PathProgramCache]: Analyzing trace with hash -406525156, now seen corresponding path program 15 times [2021-11-03 05:01:28,225 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:01:28,226 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [88603340] [2021-11-03 05:01:28,226 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:01:28,226 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:01:28,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:01:28,378 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 41 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:01:28,378 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:01:28,378 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [88603340] [2021-11-03 05:01:28,379 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [88603340] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 05:01:28,379 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1736052177] [2021-11-03 05:01:28,379 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-03 05:01:28,379 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:01:28,379 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 05:01:28,380 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 05:01:28,404 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2021-11-03 05:01:29,072 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-03 05:01:29,073 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 05:01:29,073 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-03 05:01:29,074 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:01:29,370 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 57 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:01:29,370 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:01:29,468 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 57 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:01:29,469 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1736052177] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 05:01:29,469 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [451576744] [2021-11-03 05:01:29,470 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-03 05:01:29,470 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 05:01:29,470 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 05:01:29,470 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 05:01:29,470 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 05:01:29,475 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:29,475 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:01:29,475 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:29,475 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 05:01:29,476 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:01:29,476 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:29,476 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 05:01:29,477 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 111 [2021-11-03 05:01:29,478 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_38|], 10=[|v_#valid_39|]} [2021-11-03 05:01:29,482 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:01:29,482 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 [2021-11-03 05:01:29,483 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:29,483 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:01:29,483 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:29,483 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:01:29,484 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 05:01:29,484 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:29,485 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:29,487 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:01:29,488 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:01:29,488 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:01:29,491 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:01:29,492 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 [2021-11-03 05:01:29,492 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:29,493 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:01:29,493 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:29,493 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:01:29,494 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 05:01:29,494 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:29,495 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:29,496 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:29,496 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 05:01:29,496 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 05:01:29,496 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:108, output treesize:93 [2021-11-03 05:01:29,500 INFO L180 QuantifierPusher]: treesize reduction 16, result has 87.0 percent of original size [2021-11-03 05:01:29,506 INFO L185 QuantifierPusher]: treesize reduction 5, result has 94.8 percent of original size 91 [2021-11-03 05:01:29,507 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:29,511 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:29,515 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:29,525 INFO L180 QuantifierPusher]: treesize reduction 6, result has 97.7 percent of original size [2021-11-03 05:01:29,529 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 249 [2021-11-03 05:01:29,532 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:29,546 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:29,546 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:29,547 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:29,547 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:29,547 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:29,549 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:29,551 INFO L180 QuantifierPusher]: treesize reduction 24, result has 70.7 percent of original size [2021-11-03 05:01:29,552 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 49 [2021-11-03 05:01:29,554 INFO L180 QuantifierPusher]: treesize reduction 25, result has 71.9 percent of original size [2021-11-03 05:01:29,555 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 57 [2021-11-03 05:01:29,556 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:29,559 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:29,562 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:29,567 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:29,568 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 122 [2021-11-03 05:01:29,570 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:29,575 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:29,576 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:29,576 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:29,577 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:29,577 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:29,578 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:29,580 INFO L180 QuantifierPusher]: treesize reduction 24, result has 71.8 percent of original size [2021-11-03 05:01:29,581 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 52 [2021-11-03 05:01:29,584 INFO L180 QuantifierPusher]: treesize reduction 25, result has 78.6 percent of original size [2021-11-03 05:01:29,586 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 87 [2021-11-03 05:01:29,587 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:29,590 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:29,591 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:29,593 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:29,593 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:29,606 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:29,610 INFO L180 QuantifierPusher]: treesize reduction 24, result has 78.2 percent of original size [2021-11-03 05:01:29,612 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 80 [2021-11-03 05:01:29,616 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 05:01:30,231 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 05:01:30,231 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 05:01:30,231 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 28 [2021-11-03 05:01:30,231 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [338595923] [2021-11-03 05:01:30,232 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2021-11-03 05:01:30,232 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:01:30,232 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-11-03 05:01:30,232 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=195, Invalid=1137, Unknown=0, NotChecked=0, Total=1332 [2021-11-03 05:01:30,233 INFO L87 Difference]: Start difference. First operand 40 states and 48 transitions. Second operand has 29 states, 29 states have (on average 2.206896551724138) internal successors, (64), 28 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) [2021-11-03 05:01:30,632 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:01:30,632 INFO L93 Difference]: Finished difference Result 222 states and 237 transitions. [2021-11-03 05:01:30,632 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-11-03 05:01:30,632 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 2.206896551724138) internal successors, (64), 28 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) Word has length 32 [2021-11-03 05:01:30,632 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:01:30,633 INFO L225 Difference]: With dead ends: 222 [2021-11-03 05:01:30,633 INFO L226 Difference]: Without dead ends: 198 [2021-11-03 05:01:30,633 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 129 GetRequests, 75 SyntacticMatches, 0 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 899 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=470, Invalid=2610, Unknown=0, NotChecked=0, Total=3080 [2021-11-03 05:01:30,634 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 198 states. [2021-11-03 05:01:30,651 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 198 to 40. [2021-11-03 05:01:30,652 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 39 states have (on average 1.2307692307692308) internal successors, (48), 39 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) [2021-11-03 05:01:30,652 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 48 transitions. [2021-11-03 05:01:30,652 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 48 transitions. Word has length 32 [2021-11-03 05:01:30,652 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:01:30,652 INFO L470 AbstractCegarLoop]: Abstraction has 40 states and 48 transitions. [2021-11-03 05:01:30,653 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 2.206896551724138) internal successors, (64), 28 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) [2021-11-03 05:01:30,653 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 48 transitions. [2021-11-03 05:01:30,653 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-11-03 05:01:30,653 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:01:30,653 INFO L513 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:01:30,682 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Forceful destruction successful, exit code 0 [2021-11-03 05:01:30,865 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable802 [2021-11-03 05:01:30,865 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:01:30,865 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:01:30,865 INFO L85 PathProgramCache]: Analyzing trace with hash 803340395, now seen corresponding path program 6 times [2021-11-03 05:01:30,865 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:01:30,865 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1630133264] [2021-11-03 05:01:30,865 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:01:30,866 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:01:30,876 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:01:30,999 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 41 proven. 37 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:01:30,999 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:01:30,999 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1630133264] [2021-11-03 05:01:31,000 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1630133264] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 05:01:31,000 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [395764847] [2021-11-03 05:01:31,000 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-03 05:01:31,000 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:01:31,000 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 05:01:31,002 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 05:01:31,003 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2021-11-03 05:01:31,706 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-03 05:01:31,706 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 05:01:31,708 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-03 05:01:31,709 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:01:32,080 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 57 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:01:32,080 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:01:32,183 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 57 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:01:32,183 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [395764847] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 05:01:32,183 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [77883176] [2021-11-03 05:01:32,184 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-03 05:01:32,184 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 05:01:32,184 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 05:01:32,184 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 05:01:32,184 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 05:01:32,186 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:32,187 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:01:32,187 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:32,187 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 05:01:32,187 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:01:32,188 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:32,188 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 05:01:32,189 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 111 [2021-11-03 05:01:32,190 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_39|], 10=[|v_#valid_40|]} [2021-11-03 05:01:32,194 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:01:32,194 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 [2021-11-03 05:01:32,195 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:32,195 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:01:32,195 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:32,198 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:01:32,198 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 05:01:32,198 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:32,200 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:32,202 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:01:32,203 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:01:32,203 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:01:32,206 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:01:32,207 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 [2021-11-03 05:01:32,208 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:32,209 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:01:32,209 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:32,209 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:01:32,209 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 05:01:32,210 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:32,211 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:32,212 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:32,212 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 05:01:32,212 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 05:01:32,212 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:108, output treesize:93 [2021-11-03 05:01:32,216 INFO L180 QuantifierPusher]: treesize reduction 16, result has 87.0 percent of original size [2021-11-03 05:01:32,217 INFO L185 QuantifierPusher]: treesize reduction 7, result has 92.9 percent of original size 91 [2021-11-03 05:01:32,218 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:32,222 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:32,226 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:32,238 INFO L180 QuantifierPusher]: treesize reduction 6, result has 97.7 percent of original size [2021-11-03 05:01:32,241 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 249 [2021-11-03 05:01:32,243 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:32,255 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:32,256 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:32,256 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:32,257 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:32,257 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:32,258 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:32,260 INFO L180 QuantifierPusher]: treesize reduction 24, result has 70.7 percent of original size [2021-11-03 05:01:32,261 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 49 [2021-11-03 05:01:32,265 INFO L180 QuantifierPusher]: treesize reduction 26, result has 78.5 percent of original size [2021-11-03 05:01:32,267 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 05:01:32,268 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:32,272 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:32,273 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:32,273 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:32,274 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:32,275 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:32,277 INFO L180 QuantifierPusher]: treesize reduction 30, result has 74.1 percent of original size [2021-11-03 05:01:32,279 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 80 [2021-11-03 05:01:32,285 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 05:01:32,917 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 05:01:32,917 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 05:01:32,918 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 27 [2021-11-03 05:01:32,918 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [710434289] [2021-11-03 05:01:32,918 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2021-11-03 05:01:32,918 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:01:32,918 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-11-03 05:01:32,918 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=195, Invalid=1065, Unknown=0, NotChecked=0, Total=1260 [2021-11-03 05:01:32,919 INFO L87 Difference]: Start difference. First operand 40 states and 48 transitions. Second operand has 28 states, 28 states have (on average 2.2142857142857144) internal successors, (62), 27 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) [2021-11-03 05:01:33,235 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:01:33,235 INFO L93 Difference]: Finished difference Result 247 states and 264 transitions. [2021-11-03 05:01:33,235 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-11-03 05:01:33,235 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 2.2142857142857144) internal successors, (62), 27 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 32 [2021-11-03 05:01:33,236 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:01:33,237 INFO L225 Difference]: With dead ends: 247 [2021-11-03 05:01:33,237 INFO L226 Difference]: Without dead ends: 223 [2021-11-03 05:01:33,237 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 76 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 670 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=401, Invalid=2049, Unknown=0, NotChecked=0, Total=2450 [2021-11-03 05:01:33,238 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 223 states. [2021-11-03 05:01:33,250 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 223 to 41. [2021-11-03 05:01:33,250 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 40 states have (on average 1.25) internal successors, (50), 40 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) [2021-11-03 05:01:33,250 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 50 transitions. [2021-11-03 05:01:33,251 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 50 transitions. Word has length 32 [2021-11-03 05:01:33,251 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:01:33,251 INFO L470 AbstractCegarLoop]: Abstraction has 41 states and 50 transitions. [2021-11-03 05:01:33,251 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 2.2142857142857144) internal successors, (62), 27 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) [2021-11-03 05:01:33,251 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 50 transitions. [2021-11-03 05:01:33,251 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-11-03 05:01:33,251 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:01:33,251 INFO L513 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:01:33,274 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Forceful destruction successful, exit code 0 [2021-11-03 05:01:33,452 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable831 [2021-11-03 05:01:33,452 INFO L402 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:01:33,452 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:01:33,452 INFO L85 PathProgramCache]: Analyzing trace with hash -420082097, now seen corresponding path program 12 times [2021-11-03 05:01:33,452 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:01:33,452 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [831695463] [2021-11-03 05:01:33,453 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:01:33,453 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:01:33,463 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:01:33,531 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 21 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:01:33,532 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:01:33,532 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [831695463] [2021-11-03 05:01:33,532 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [831695463] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 05:01:33,532 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [29634383] [2021-11-03 05:01:33,532 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-03 05:01:33,532 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:01:33,533 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 05:01:33,548 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 05:01:33,554 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2021-11-03 05:01:34,264 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-03 05:01:34,264 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 05:01:34,265 INFO L263 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-03 05:01:34,266 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:01:34,351 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 28 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:01:34,351 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:01:34,435 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 28 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:01:34,435 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [29634383] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 05:01:34,435 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [172949081] [2021-11-03 05:01:34,436 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-03 05:01:34,436 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 05:01:34,437 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 05:01:34,437 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 05:01:34,437 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 05:01:34,454 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:34,454 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:01:34,455 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:34,455 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 05:01:34,455 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:01:34,455 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:34,456 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 05:01:34,456 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 111 [2021-11-03 05:01:34,457 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_40|], 10=[|v_#valid_41|]} [2021-11-03 05:01:34,462 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:01:34,462 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 [2021-11-03 05:01:34,462 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:34,463 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:01:34,463 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:34,463 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:01:34,463 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 05:01:34,463 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:34,465 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:34,467 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:01:34,468 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:01:34,468 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:01:34,471 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:01:34,471 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 [2021-11-03 05:01:34,472 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:34,473 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:01:34,473 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:34,473 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:01:34,474 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 05:01:34,474 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:34,475 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:34,476 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:34,476 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 05:01:34,476 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 05:01:34,476 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:108, output treesize:93 [2021-11-03 05:01:34,481 INFO L180 QuantifierPusher]: treesize reduction 17, result has 86.9 percent of original size [2021-11-03 05:01:34,482 INFO L185 QuantifierPusher]: treesize reduction 5, result has 95.1 percent of original size 97 [2021-11-03 05:01:34,484 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:34,488 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:34,492 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:34,504 INFO L180 QuantifierPusher]: treesize reduction 12, result has 95.7 percent of original size [2021-11-03 05:01:34,506 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 267 [2021-11-03 05:01:34,509 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:34,524 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:34,525 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:34,525 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:34,525 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:34,526 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:34,527 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:34,529 INFO L180 QuantifierPusher]: treesize reduction 30, result has 67.0 percent of original size [2021-11-03 05:01:34,530 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 52 [2021-11-03 05:01:34,534 INFO L180 QuantifierPusher]: treesize reduction 31, result has 74.8 percent of original size [2021-11-03 05:01:34,536 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 87 [2021-11-03 05:01:34,537 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:34,541 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:34,541 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:34,542 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:34,542 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:34,544 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:34,547 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:34,549 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 138 [2021-11-03 05:01:34,551 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:34,559 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:34,560 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:34,560 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:34,561 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:34,562 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:34,562 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:34,563 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:34,564 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:34,567 INFO L180 QuantifierPusher]: treesize reduction 30, result has 74.1 percent of original size [2021-11-03 05:01:34,568 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 80 [2021-11-03 05:01:34,572 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 05:01:35,168 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 05:01:35,168 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 05:01:35,168 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 12 [2021-11-03 05:01:35,168 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1635383063] [2021-11-03 05:01:35,168 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-03 05:01:35,169 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:01:35,169 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-03 05:01:35,169 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=331, Unknown=0, NotChecked=0, Total=420 [2021-11-03 05:01:35,169 INFO L87 Difference]: Start difference. First operand 41 states and 50 transitions. Second operand has 13 states, 13 states have (on average 3.076923076923077) internal successors, (40), 12 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) [2021-11-03 05:01:35,320 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:01:35,320 INFO L93 Difference]: Finished difference Result 52 states and 61 transitions. [2021-11-03 05:01:35,321 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-11-03 05:01:35,321 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 3.076923076923077) internal successors, (40), 12 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 33 [2021-11-03 05:01:35,321 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:01:35,321 INFO L225 Difference]: With dead ends: 52 [2021-11-03 05:01:35,322 INFO L226 Difference]: Without dead ends: 50 [2021-11-03 05:01:35,322 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 92 SyntacticMatches, 2 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 230 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=200, Invalid=670, Unknown=0, NotChecked=0, Total=870 [2021-11-03 05:01:35,322 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2021-11-03 05:01:35,342 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 44. [2021-11-03 05:01:35,342 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 43 states have (on average 1.2325581395348837) internal successors, (53), 43 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:01:35,342 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 53 transitions. [2021-11-03 05:01:35,343 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 53 transitions. Word has length 33 [2021-11-03 05:01:35,343 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:01:35,343 INFO L470 AbstractCegarLoop]: Abstraction has 44 states and 53 transitions. [2021-11-03 05:01:35,343 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 3.076923076923077) internal successors, (40), 12 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) [2021-11-03 05:01:35,343 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 53 transitions. [2021-11-03 05:01:35,344 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-11-03 05:01:35,344 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:01:35,344 INFO L513 BasicCegarLoop]: trace histogram [8, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:01:35,381 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Forceful destruction successful, exit code 0 [2021-11-03 05:01:35,557 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable850,35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:01:35,557 INFO L402 AbstractCegarLoop]: === Iteration 36 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:01:35,557 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:01:35,557 INFO L85 PathProgramCache]: Analyzing trace with hash 873791937, now seen corresponding path program 13 times [2021-11-03 05:01:35,558 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:01:35,558 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2123290442] [2021-11-03 05:01:35,558 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:01:35,558 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:01:35,572 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:01:35,718 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 58 proven. 47 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:01:35,719 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:01:35,719 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2123290442] [2021-11-03 05:01:35,719 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2123290442] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 05:01:35,719 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1197947295] [2021-11-03 05:01:35,719 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-03 05:01:35,719 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:01:35,719 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 05:01:35,720 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 05:01:35,720 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2021-11-03 05:01:36,459 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:01:36,460 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-03 05:01:36,461 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:01:36,924 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 77 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:01:36,924 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:01:37,042 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 77 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:01:37,042 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1197947295] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 05:01:37,043 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [401459822] [2021-11-03 05:01:37,044 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-03 05:01:37,044 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 05:01:37,044 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 05:01:37,044 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 05:01:37,044 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 05:01:37,051 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:37,051 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:01:37,051 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:37,052 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 05:01:37,052 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:01:37,052 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:37,052 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 05:01:37,053 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 111 [2021-11-03 05:01:37,054 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_41|], 10=[|v_#valid_42|]} [2021-11-03 05:01:37,058 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:01:37,059 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 [2021-11-03 05:01:37,059 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:37,059 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:01:37,060 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:37,060 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:01:37,060 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 05:01:37,060 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:37,061 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:37,064 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:01:37,064 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:01:37,065 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:01:37,068 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:01:37,068 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 [2021-11-03 05:01:37,069 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:37,070 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:01:37,070 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:37,070 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:01:37,070 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 05:01:37,071 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:37,072 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:37,073 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:37,073 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 05:01:37,073 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 05:01:37,074 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:108, output treesize:93 [2021-11-03 05:01:37,079 INFO L180 QuantifierPusher]: treesize reduction 17, result has 86.9 percent of original size [2021-11-03 05:01:37,081 INFO L185 QuantifierPusher]: treesize reduction 7, result has 93.3 percent of original size 97 [2021-11-03 05:01:37,082 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:37,087 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:37,091 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:37,101 INFO L180 QuantifierPusher]: treesize reduction 12, result has 95.7 percent of original size [2021-11-03 05:01:37,104 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 267 [2021-11-03 05:01:37,107 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:37,121 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:37,139 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:37,140 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:37,140 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:37,141 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:37,142 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:37,144 INFO L180 QuantifierPusher]: treesize reduction 30, result has 67.0 percent of original size [2021-11-03 05:01:37,145 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 52 [2021-11-03 05:01:37,149 INFO L180 QuantifierPusher]: treesize reduction 31, result has 74.8 percent of original size [2021-11-03 05:01:37,150 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 90 [2021-11-03 05:01:37,151 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:37,155 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:37,156 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:37,156 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:37,157 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:37,163 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:37,166 INFO L180 QuantifierPusher]: treesize reduction 30, result has 74.1 percent of original size [2021-11-03 05:01:37,167 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 80 [2021-11-03 05:01:37,172 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 05:01:37,863 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 05:01:37,863 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 05:01:37,863 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 37 [2021-11-03 05:01:37,863 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [781232679] [2021-11-03 05:01:37,864 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2021-11-03 05:01:37,864 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:01:37,864 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-11-03 05:01:37,864 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=316, Invalid=1754, Unknown=0, NotChecked=0, Total=2070 [2021-11-03 05:01:37,865 INFO L87 Difference]: Start difference. First operand 44 states and 53 transitions. Second operand has 38 states, 38 states have (on average 2.0) internal successors, (76), 37 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) [2021-11-03 05:01:38,279 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:01:38,279 INFO L93 Difference]: Finished difference Result 104 states and 115 transitions. [2021-11-03 05:01:38,279 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-03 05:01:38,279 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 2.0) internal successors, (76), 37 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) Word has length 36 [2021-11-03 05:01:38,279 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:01:38,280 INFO L225 Difference]: With dead ends: 104 [2021-11-03 05:01:38,280 INFO L226 Difference]: Without dead ends: 77 [2021-11-03 05:01:38,280 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 80 SyntacticMatches, 0 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1266 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=599, Invalid=3183, Unknown=0, NotChecked=0, Total=3782 [2021-11-03 05:01:38,280 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2021-11-03 05:01:38,294 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 45. [2021-11-03 05:01:38,294 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 44 states have (on average 1.2272727272727273) internal successors, (54), 44 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) [2021-11-03 05:01:38,295 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 54 transitions. [2021-11-03 05:01:38,295 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 54 transitions. Word has length 36 [2021-11-03 05:01:38,295 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:01:38,295 INFO L470 AbstractCegarLoop]: Abstraction has 45 states and 54 transitions. [2021-11-03 05:01:38,295 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 2.0) internal successors, (76), 37 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) [2021-11-03 05:01:38,295 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 54 transitions. [2021-11-03 05:01:38,296 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-11-03 05:01:38,296 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:01:38,296 INFO L513 BasicCegarLoop]: trace histogram [8, 7, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:01:38,322 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Forceful destruction successful, exit code 0 [2021-11-03 05:01:38,505 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable878,36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:01:38,505 INFO L402 AbstractCegarLoop]: === Iteration 37 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:01:38,505 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:01:38,505 INFO L85 PathProgramCache]: Analyzing trace with hash 629765458, now seen corresponding path program 16 times [2021-11-03 05:01:38,505 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:01:38,505 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1437616539] [2021-11-03 05:01:38,505 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:01:38,505 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:01:38,515 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:01:38,671 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 58 proven. 41 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:01:38,672 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:01:38,672 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1437616539] [2021-11-03 05:01:38,672 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1437616539] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 05:01:38,672 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1439472141] [2021-11-03 05:01:38,672 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-03 05:01:38,672 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:01:38,673 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 05:01:38,673 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 05:01:38,691 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process [2021-11-03 05:01:39,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:01:39,467 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-03 05:01:39,469 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:01:39,924 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 77 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:01:39,924 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:01:40,053 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 77 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:01:40,053 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1439472141] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 05:01:40,054 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [243539294] [2021-11-03 05:01:40,054 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-03 05:01:40,055 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 05:01:40,055 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 05:01:40,055 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 05:01:40,055 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 05:01:40,058 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:40,058 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:01:40,059 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:40,059 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 05:01:40,059 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:01:40,060 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:40,060 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 05:01:40,061 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 111 [2021-11-03 05:01:40,063 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_42|], 10=[|v_#valid_43|]} [2021-11-03 05:01:40,068 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:01:40,069 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 [2021-11-03 05:01:40,069 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:40,070 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:01:40,070 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:40,071 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:01:40,071 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 05:01:40,071 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:40,073 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:40,076 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:01:40,077 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:01:40,078 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:01:40,081 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:01:40,082 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 [2021-11-03 05:01:40,083 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:40,084 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:01:40,084 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:40,085 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:01:40,085 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 05:01:40,085 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:40,087 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:40,088 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:40,089 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 05:01:40,089 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 05:01:40,090 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:108, output treesize:93 [2021-11-03 05:01:40,094 INFO L180 QuantifierPusher]: treesize reduction 16, result has 87.0 percent of original size [2021-11-03 05:01:40,096 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 100 [2021-11-03 05:01:40,098 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:40,104 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:40,110 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:40,124 INFO L180 QuantifierPusher]: treesize reduction 11, result has 95.8 percent of original size [2021-11-03 05:01:40,129 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 251 [2021-11-03 05:01:40,132 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:40,149 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:40,149 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:40,150 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:40,151 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:40,151 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:40,153 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:40,156 INFO L180 QuantifierPusher]: treesize reduction 24, result has 70.7 percent of original size [2021-11-03 05:01:40,157 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 49 [2021-11-03 05:01:40,162 INFO L180 QuantifierPusher]: treesize reduction 25, result has 71.9 percent of original size [2021-11-03 05:01:40,164 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 57 [2021-11-03 05:01:40,165 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:40,169 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:40,173 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:40,181 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:40,183 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 122 [2021-11-03 05:01:40,185 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:40,194 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:40,194 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:40,195 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:40,195 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:40,196 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:40,198 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:40,201 INFO L180 QuantifierPusher]: treesize reduction 24, result has 71.8 percent of original size [2021-11-03 05:01:40,202 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 52 [2021-11-03 05:01:40,207 INFO L180 QuantifierPusher]: treesize reduction 25, result has 78.6 percent of original size [2021-11-03 05:01:40,209 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 90 [2021-11-03 05:01:40,211 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:40,217 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:40,218 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:40,218 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:40,219 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:40,220 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:40,226 INFO L180 QuantifierPusher]: treesize reduction 24, result has 78.2 percent of original size [2021-11-03 05:01:40,228 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 80 [2021-11-03 05:01:40,233 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 05:01:40,945 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 05:01:40,945 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 05:01:40,945 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 36 [2021-11-03 05:01:40,945 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1047181509] [2021-11-03 05:01:40,945 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2021-11-03 05:01:40,945 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:01:40,946 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-11-03 05:01:40,946 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=282, Invalid=1698, Unknown=0, NotChecked=0, Total=1980 [2021-11-03 05:01:40,946 INFO L87 Difference]: Start difference. First operand 45 states and 54 transitions. Second operand has 37 states, 37 states have (on average 2.054054054054054) internal successors, (76), 36 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) [2021-11-03 05:01:41,397 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:01:41,397 INFO L93 Difference]: Finished difference Result 136 states and 148 transitions. [2021-11-03 05:01:41,397 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-03 05:01:41,397 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 2.054054054054054) internal successors, (76), 36 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) Word has length 36 [2021-11-03 05:01:41,397 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:01:41,398 INFO L225 Difference]: With dead ends: 136 [2021-11-03 05:01:41,398 INFO L226 Difference]: Without dead ends: 109 [2021-11-03 05:01:41,398 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 81 SyntacticMatches, 0 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1469 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=664, Invalid=3758, Unknown=0, NotChecked=0, Total=4422 [2021-11-03 05:01:41,399 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2021-11-03 05:01:41,422 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 45. [2021-11-03 05:01:41,423 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 44 states have (on average 1.2272727272727273) internal successors, (54), 44 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) [2021-11-03 05:01:41,423 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 54 transitions. [2021-11-03 05:01:41,423 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 54 transitions. Word has length 36 [2021-11-03 05:01:41,423 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:01:41,423 INFO L470 AbstractCegarLoop]: Abstraction has 45 states and 54 transitions. [2021-11-03 05:01:41,424 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 37 states have (on average 2.054054054054054) internal successors, (76), 36 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) [2021-11-03 05:01:41,424 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 54 transitions. [2021-11-03 05:01:41,424 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-11-03 05:01:41,424 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:01:41,424 INFO L513 BasicCegarLoop]: trace histogram [8, 7, 7, 5, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:01:41,456 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Forceful destruction successful, exit code 0 [2021-11-03 05:01:41,645 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable897 [2021-11-03 05:01:41,645 INFO L402 AbstractCegarLoop]: === Iteration 38 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:01:41,645 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:01:41,645 INFO L85 PathProgramCache]: Analyzing trace with hash 1591724961, now seen corresponding path program 17 times [2021-11-03 05:01:41,645 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:01:41,645 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [307309372] [2021-11-03 05:01:41,645 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:01:41,646 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:01:41,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:01:41,812 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 58 proven. 37 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:01:41,812 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:01:41,812 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [307309372] [2021-11-03 05:01:41,812 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [307309372] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 05:01:41,812 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1076058156] [2021-11-03 05:01:41,812 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-03 05:01:41,813 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:01:41,813 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 05:01:41,817 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 05:01:41,833 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Waiting until timeout for monitored process [2021-11-03 05:01:42,642 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2021-11-03 05:01:42,642 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 05:01:42,643 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-03 05:01:42,644 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:01:43,063 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 77 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:01:43,063 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:01:43,187 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 77 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:01:43,188 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1076058156] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 05:01:43,188 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [383040072] [2021-11-03 05:01:43,188 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-03 05:01:43,189 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 05:01:43,189 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 05:01:43,189 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 05:01:43,189 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 05:01:43,194 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:43,195 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:01:43,196 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:43,196 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 05:01:43,196 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:01:43,197 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:43,197 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 05:01:43,198 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 111 [2021-11-03 05:01:43,200 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_43|], 10=[|v_#valid_44|]} [2021-11-03 05:01:43,205 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:01:43,206 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 [2021-11-03 05:01:43,206 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:43,207 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:01:43,207 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:43,207 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:01:43,208 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 05:01:43,208 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:43,210 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:43,213 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:01:43,214 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:01:43,214 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:01:43,218 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:01:43,218 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 [2021-11-03 05:01:43,219 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:43,220 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:01:43,221 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:43,221 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:01:43,221 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 05:01:43,221 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:43,224 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:43,225 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:43,226 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 05:01:43,226 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 05:01:43,226 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:108, output treesize:93 [2021-11-03 05:01:43,230 INFO L180 QuantifierPusher]: treesize reduction 16, result has 87.0 percent of original size [2021-11-03 05:01:43,231 INFO L185 QuantifierPusher]: treesize reduction 5, result has 94.8 percent of original size 91 [2021-11-03 05:01:43,232 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:43,236 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:43,240 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:43,250 INFO L180 QuantifierPusher]: treesize reduction 6, result has 97.7 percent of original size [2021-11-03 05:01:43,252 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 249 [2021-11-03 05:01:43,255 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:43,266 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:43,267 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:43,267 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:43,268 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:43,268 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:43,269 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:43,271 INFO L180 QuantifierPusher]: treesize reduction 24, result has 70.7 percent of original size [2021-11-03 05:01:43,272 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 49 [2021-11-03 05:01:43,275 INFO L180 QuantifierPusher]: treesize reduction 25, result has 71.9 percent of original size [2021-11-03 05:01:43,276 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 57 [2021-11-03 05:01:43,277 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:43,279 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:43,282 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:43,287 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:43,288 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 122 [2021-11-03 05:01:43,290 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:43,296 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:43,296 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:43,296 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:43,297 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:43,297 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:43,298 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:43,300 INFO L180 QuantifierPusher]: treesize reduction 24, result has 71.8 percent of original size [2021-11-03 05:01:43,301 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 52 [2021-11-03 05:01:43,304 INFO L180 QuantifierPusher]: treesize reduction 25, result has 78.6 percent of original size [2021-11-03 05:01:43,306 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 87 [2021-11-03 05:01:43,307 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:43,312 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:43,313 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:43,313 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:43,313 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:43,314 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:43,317 INFO L180 QuantifierPusher]: treesize reduction 24, result has 78.2 percent of original size [2021-11-03 05:01:43,318 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 80 [2021-11-03 05:01:43,322 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 05:01:43,959 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 05:01:43,959 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 05:01:43,960 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 35 [2021-11-03 05:01:43,960 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [652184836] [2021-11-03 05:01:43,960 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2021-11-03 05:01:43,960 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:01:43,960 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-11-03 05:01:43,961 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=264, Invalid=1628, Unknown=0, NotChecked=0, Total=1892 [2021-11-03 05:01:43,961 INFO L87 Difference]: Start difference. First operand 45 states and 54 transitions. Second operand has 36 states, 36 states have (on average 2.0833333333333335) internal successors, (75), 35 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:01:44,463 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:01:44,463 INFO L93 Difference]: Finished difference Result 167 states and 180 transitions. [2021-11-03 05:01:44,463 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-11-03 05:01:44,463 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 2.0833333333333335) internal successors, (75), 35 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 36 [2021-11-03 05:01:44,463 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:01:44,464 INFO L225 Difference]: With dead ends: 167 [2021-11-03 05:01:44,464 INFO L226 Difference]: Without dead ends: 140 [2021-11-03 05:01:44,465 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 82 SyntacticMatches, 0 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1592 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=721, Invalid=4109, Unknown=0, NotChecked=0, Total=4830 [2021-11-03 05:01:44,465 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 140 states. [2021-11-03 05:01:44,484 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 140 to 45. [2021-11-03 05:01:44,484 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 44 states have (on average 1.2272727272727273) internal successors, (54), 44 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) [2021-11-03 05:01:44,485 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 54 transitions. [2021-11-03 05:01:44,485 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 54 transitions. Word has length 36 [2021-11-03 05:01:44,485 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:01:44,485 INFO L470 AbstractCegarLoop]: Abstraction has 45 states and 54 transitions. [2021-11-03 05:01:44,485 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 36 states have (on average 2.0833333333333335) internal successors, (75), 35 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:01:44,485 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 54 transitions. [2021-11-03 05:01:44,486 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-11-03 05:01:44,486 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:01:44,486 INFO L513 BasicCegarLoop]: trace histogram [8, 7, 7, 4, 3, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:01:44,516 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Forceful destruction successful, exit code 0 [2021-11-03 05:01:44,701 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable926,38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:01:44,701 INFO L402 AbstractCegarLoop]: === Iteration 39 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:01:44,701 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:01:44,701 INFO L85 PathProgramCache]: Analyzing trace with hash -1286738062, now seen corresponding path program 18 times [2021-11-03 05:01:44,702 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:01:44,702 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1452786545] [2021-11-03 05:01:44,702 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:01:44,702 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:01:44,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:01:44,870 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 58 proven. 35 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:01:44,870 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:01:44,870 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1452786545] [2021-11-03 05:01:44,870 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1452786545] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 05:01:44,870 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1217341061] [2021-11-03 05:01:44,870 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-03 05:01:44,871 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:01:44,871 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 05:01:44,877 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 05:01:44,893 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Waiting until timeout for monitored process [2021-11-03 05:01:45,917 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-03 05:01:45,917 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 05:01:45,918 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-03 05:01:45,918 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:01:46,330 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 77 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:01:46,331 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:01:46,453 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 77 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:01:46,453 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1217341061] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 05:01:46,453 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1443763625] [2021-11-03 05:01:46,454 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-03 05:01:46,454 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 05:01:46,454 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 05:01:46,454 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 05:01:46,454 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 05:01:46,461 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:46,461 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:01:46,461 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:46,462 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 05:01:46,462 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:01:46,462 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:46,462 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 05:01:46,463 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 111 [2021-11-03 05:01:46,465 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_44|], 10=[|v_#valid_45|]} [2021-11-03 05:01:46,470 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:01:46,471 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 [2021-11-03 05:01:46,471 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:46,471 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:01:46,471 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:46,472 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:01:46,472 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 05:01:46,473 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:46,474 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:46,476 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:01:46,477 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:01:46,478 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:01:46,480 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:01:46,482 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 [2021-11-03 05:01:46,482 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:46,483 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:01:46,483 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:46,484 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:01:46,484 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 05:01:46,484 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:46,485 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:46,486 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:46,486 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 05:01:46,487 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 05:01:46,487 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:108, output treesize:93 [2021-11-03 05:01:46,490 INFO L180 QuantifierPusher]: treesize reduction 16, result has 87.0 percent of original size [2021-11-03 05:01:46,491 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 100 [2021-11-03 05:01:46,493 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:46,496 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:46,500 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:46,509 INFO L180 QuantifierPusher]: treesize reduction 11, result has 95.8 percent of original size [2021-11-03 05:01:46,512 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 251 [2021-11-03 05:01:46,514 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:46,525 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:46,526 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:46,527 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:46,527 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:46,527 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:46,529 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:46,531 INFO L180 QuantifierPusher]: treesize reduction 24, result has 70.7 percent of original size [2021-11-03 05:01:46,531 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 49 [2021-11-03 05:01:46,535 INFO L180 QuantifierPusher]: treesize reduction 25, result has 71.9 percent of original size [2021-11-03 05:01:46,536 INFO L185 QuantifierPusher]: treesize reduction 5, result has 90.6 percent of original size 48 [2021-11-03 05:01:46,538 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:46,540 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:46,543 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:46,548 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:46,549 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 120 [2021-11-03 05:01:46,551 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:46,556 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:46,557 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:46,557 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:46,558 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:46,558 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:46,560 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:46,562 INFO L180 QuantifierPusher]: treesize reduction 24, result has 71.8 percent of original size [2021-11-03 05:01:46,563 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 52 [2021-11-03 05:01:46,566 INFO L180 QuantifierPusher]: treesize reduction 25, result has 78.6 percent of original size [2021-11-03 05:01:46,567 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 90 [2021-11-03 05:01:46,569 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:46,572 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:46,573 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:46,573 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:46,574 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:46,575 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:46,577 INFO L180 QuantifierPusher]: treesize reduction 24, result has 78.2 percent of original size [2021-11-03 05:01:46,578 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 80 [2021-11-03 05:01:46,582 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 05:01:47,200 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 05:01:47,200 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 05:01:47,200 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 34 [2021-11-03 05:01:47,200 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [932901525] [2021-11-03 05:01:47,200 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2021-11-03 05:01:47,200 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:01:47,201 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-11-03 05:01:47,201 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=250, Invalid=1556, Unknown=0, NotChecked=0, Total=1806 [2021-11-03 05:01:47,201 INFO L87 Difference]: Start difference. First operand 45 states and 54 transitions. Second operand has 35 states, 35 states have (on average 2.1142857142857143) internal successors, (74), 34 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) [2021-11-03 05:01:47,772 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:01:47,772 INFO L93 Difference]: Finished difference Result 197 states and 211 transitions. [2021-11-03 05:01:47,772 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-11-03 05:01:47,772 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 2.1142857142857143) internal successors, (74), 34 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 36 [2021-11-03 05:01:47,772 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:01:47,773 INFO L225 Difference]: With dead ends: 197 [2021-11-03 05:01:47,773 INFO L226 Difference]: Without dead ends: 170 [2021-11-03 05:01:47,773 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 152 GetRequests, 83 SyntacticMatches, 0 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1618 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=741, Invalid=4229, Unknown=0, NotChecked=0, Total=4970 [2021-11-03 05:01:47,774 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 170 states. [2021-11-03 05:01:47,790 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 170 to 45. [2021-11-03 05:01:47,790 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 44 states have (on average 1.2272727272727273) internal successors, (54), 44 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) [2021-11-03 05:01:47,791 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 54 transitions. [2021-11-03 05:01:47,791 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 54 transitions. Word has length 36 [2021-11-03 05:01:47,791 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:01:47,791 INFO L470 AbstractCegarLoop]: Abstraction has 45 states and 54 transitions. [2021-11-03 05:01:47,791 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 2.1142857142857143) internal successors, (74), 34 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) [2021-11-03 05:01:47,791 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 54 transitions. [2021-11-03 05:01:47,791 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-11-03 05:01:47,791 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:01:47,791 INFO L513 BasicCegarLoop]: trace histogram [8, 7, 7, 4, 3, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:01:47,814 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Ended with exit code 0 [2021-11-03 05:01:47,992 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable955 [2021-11-03 05:01:47,992 INFO L402 AbstractCegarLoop]: === Iteration 40 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:01:47,992 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:01:47,993 INFO L85 PathProgramCache]: Analyzing trace with hash -409760383, now seen corresponding path program 19 times [2021-11-03 05:01:47,993 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:01:47,993 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1969465123] [2021-11-03 05:01:47,993 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:01:47,993 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:01:48,006 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:01:48,141 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 58 proven. 35 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:01:48,141 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:01:48,142 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1969465123] [2021-11-03 05:01:48,142 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1969465123] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 05:01:48,142 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [988337051] [2021-11-03 05:01:48,142 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-03 05:01:48,142 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:01:48,142 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 05:01:48,143 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 05:01:48,144 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Waiting until timeout for monitored process [2021-11-03 05:01:49,021 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:01:49,022 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-03 05:01:49,023 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:01:49,401 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 77 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:01:49,402 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:01:49,511 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 77 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:01:49,512 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [988337051] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 05:01:49,512 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1338820519] [2021-11-03 05:01:49,513 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-03 05:01:49,513 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 05:01:49,513 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 05:01:49,513 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 05:01:49,513 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 05:01:49,515 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:49,515 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:01:49,516 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:49,516 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 05:01:49,516 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:01:49,516 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:49,516 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 05:01:49,517 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 111 [2021-11-03 05:01:49,518 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_45|], 10=[|v_#valid_46|]} [2021-11-03 05:01:49,522 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:01:49,523 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 [2021-11-03 05:01:49,523 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:49,524 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:01:49,524 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:49,524 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:01:49,524 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 05:01:49,524 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:49,526 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:49,528 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:01:49,529 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:01:49,530 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:01:49,532 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:01:49,533 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 [2021-11-03 05:01:49,533 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:49,535 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:01:49,535 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:49,535 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:01:49,535 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 05:01:49,535 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:49,537 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:49,537 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:49,538 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 05:01:49,538 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 05:01:49,538 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:108, output treesize:93 [2021-11-03 05:01:49,542 INFO L180 QuantifierPusher]: treesize reduction 16, result has 87.0 percent of original size [2021-11-03 05:01:49,543 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 100 [2021-11-03 05:01:49,544 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:49,548 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:49,552 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:49,561 INFO L180 QuantifierPusher]: treesize reduction 11, result has 95.8 percent of original size [2021-11-03 05:01:49,567 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 251 [2021-11-03 05:01:49,570 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:49,581 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:49,582 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:49,582 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:49,582 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:49,583 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:49,584 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:49,586 INFO L180 QuantifierPusher]: treesize reduction 24, result has 70.7 percent of original size [2021-11-03 05:01:49,587 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 49 [2021-11-03 05:01:49,590 INFO L180 QuantifierPusher]: treesize reduction 25, result has 71.9 percent of original size [2021-11-03 05:01:49,591 INFO L185 QuantifierPusher]: treesize reduction 5, result has 90.6 percent of original size 48 [2021-11-03 05:01:49,592 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:49,595 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:49,598 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:49,603 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:49,604 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 120 [2021-11-03 05:01:49,606 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:49,611 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:49,612 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:49,612 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:49,613 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:49,614 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:49,615 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:49,637 INFO L180 QuantifierPusher]: treesize reduction 24, result has 71.8 percent of original size [2021-11-03 05:01:49,638 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 52 [2021-11-03 05:01:49,644 INFO L180 QuantifierPusher]: treesize reduction 25, result has 78.6 percent of original size [2021-11-03 05:01:49,645 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 90 [2021-11-03 05:01:49,647 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:49,650 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:49,651 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:49,651 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:49,652 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:49,653 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:49,655 INFO L180 QuantifierPusher]: treesize reduction 24, result has 78.2 percent of original size [2021-11-03 05:01:49,657 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 80 [2021-11-03 05:01:49,660 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 05:01:50,276 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 05:01:50,276 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 05:01:50,277 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 33 [2021-11-03 05:01:50,277 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [790845161] [2021-11-03 05:01:50,277 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-03 05:01:50,277 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:01:50,277 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-03 05:01:50,277 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=240, Invalid=1482, Unknown=0, NotChecked=0, Total=1722 [2021-11-03 05:01:50,277 INFO L87 Difference]: Start difference. First operand 45 states and 54 transitions. Second operand has 34 states, 34 states have (on average 2.1470588235294117) internal successors, (73), 33 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:01:50,939 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:01:50,940 INFO L93 Difference]: Finished difference Result 226 states and 241 transitions. [2021-11-03 05:01:50,940 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-11-03 05:01:50,940 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 2.1470588235294117) internal successors, (73), 33 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 36 [2021-11-03 05:01:50,940 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:01:50,941 INFO L225 Difference]: With dead ends: 226 [2021-11-03 05:01:50,941 INFO L226 Difference]: Without dead ends: 199 [2021-11-03 05:01:50,942 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 152 GetRequests, 84 SyntacticMatches, 0 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1546 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=721, Invalid=4109, Unknown=0, NotChecked=0, Total=4830 [2021-11-03 05:01:50,943 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 199 states. [2021-11-03 05:01:50,969 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 199 to 45. [2021-11-03 05:01:50,969 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 44 states have (on average 1.2272727272727273) internal successors, (54), 44 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) [2021-11-03 05:01:50,970 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 54 transitions. [2021-11-03 05:01:50,970 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 54 transitions. Word has length 36 [2021-11-03 05:01:50,970 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:01:50,970 INFO L470 AbstractCegarLoop]: Abstraction has 45 states and 54 transitions. [2021-11-03 05:01:50,970 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 2.1470588235294117) internal successors, (73), 33 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:01:50,971 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 54 transitions. [2021-11-03 05:01:50,971 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-11-03 05:01:50,971 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:01:50,971 INFO L513 BasicCegarLoop]: trace histogram [8, 7, 7, 5, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:01:51,011 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Forceful destruction successful, exit code 0 [2021-11-03 05:01:51,189 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable984 [2021-11-03 05:01:51,189 INFO L402 AbstractCegarLoop]: === Iteration 41 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:01:51,189 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:01:51,189 INFO L85 PathProgramCache]: Analyzing trace with hash -2044038766, now seen corresponding path program 20 times [2021-11-03 05:01:51,189 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:01:51,189 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1825888755] [2021-11-03 05:01:51,189 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:01:51,190 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:01:51,215 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:01:51,360 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 58 proven. 37 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:01:51,361 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:01:51,361 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1825888755] [2021-11-03 05:01:51,361 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1825888755] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 05:01:51,361 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [658716223] [2021-11-03 05:01:51,361 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-03 05:01:51,362 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:01:51,362 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 05:01:51,365 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 05:01:51,370 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Waiting until timeout for monitored process [2021-11-03 05:01:52,287 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2021-11-03 05:01:52,287 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 05:01:52,288 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-03 05:01:52,289 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:01:52,649 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 77 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:01:52,649 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:01:52,776 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 77 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:01:52,776 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [658716223] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 05:01:52,776 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2020918898] [2021-11-03 05:01:52,777 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-03 05:01:52,777 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 05:01:52,777 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 05:01:52,778 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 05:01:52,778 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 05:01:52,782 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:52,782 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:01:52,782 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:52,783 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 05:01:52,783 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:01:52,784 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:52,784 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 05:01:52,785 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 111 [2021-11-03 05:01:52,787 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_46|], 10=[|v_#valid_47|]} [2021-11-03 05:01:52,792 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:01:52,793 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 [2021-11-03 05:01:52,793 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:52,793 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:01:52,794 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:52,794 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:01:52,794 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 05:01:52,795 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:52,796 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:52,798 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:01:52,799 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:01:52,800 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:01:52,803 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:01:52,804 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 [2021-11-03 05:01:52,804 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:52,805 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:01:52,805 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:52,806 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:01:52,806 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 05:01:52,806 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:52,807 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:52,808 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:52,808 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 05:01:52,808 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 05:01:52,809 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:108, output treesize:93 [2021-11-03 05:01:52,812 INFO L180 QuantifierPusher]: treesize reduction 16, result has 87.0 percent of original size [2021-11-03 05:01:52,813 INFO L185 QuantifierPusher]: treesize reduction 7, result has 92.9 percent of original size 91 [2021-11-03 05:01:52,814 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:52,818 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:52,822 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:52,831 INFO L180 QuantifierPusher]: treesize reduction 6, result has 97.7 percent of original size [2021-11-03 05:01:52,834 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 249 [2021-11-03 05:01:52,836 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:52,848 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:52,848 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:52,849 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:52,849 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:52,850 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:52,851 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:52,853 INFO L180 QuantifierPusher]: treesize reduction 24, result has 70.7 percent of original size [2021-11-03 05:01:52,854 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 49 [2021-11-03 05:01:52,857 INFO L180 QuantifierPusher]: treesize reduction 25, result has 71.9 percent of original size [2021-11-03 05:01:52,865 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 57 [2021-11-03 05:01:52,866 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:52,871 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:52,875 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:52,882 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:52,885 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 122 [2021-11-03 05:01:52,887 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:52,895 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:52,896 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:52,897 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:52,897 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:52,898 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:52,899 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:52,902 INFO L180 QuantifierPusher]: treesize reduction 24, result has 71.8 percent of original size [2021-11-03 05:01:52,904 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 52 [2021-11-03 05:01:52,908 INFO L180 QuantifierPusher]: treesize reduction 25, result has 78.6 percent of original size [2021-11-03 05:01:52,910 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 90 [2021-11-03 05:01:52,912 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:52,919 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:52,919 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:52,920 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:52,920 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:52,922 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:52,924 INFO L180 QuantifierPusher]: treesize reduction 24, result has 78.2 percent of original size [2021-11-03 05:01:52,925 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 80 [2021-11-03 05:01:52,929 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 05:01:53,560 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 05:01:53,560 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 05:01:53,560 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 32 [2021-11-03 05:01:53,561 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [567401218] [2021-11-03 05:01:53,561 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2021-11-03 05:01:53,561 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:01:53,561 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-11-03 05:01:53,562 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=234, Invalid=1406, Unknown=0, NotChecked=0, Total=1640 [2021-11-03 05:01:53,562 INFO L87 Difference]: Start difference. First operand 45 states and 54 transitions. Second operand has 33 states, 33 states have (on average 2.1818181818181817) internal successors, (72), 32 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) [2021-11-03 05:01:54,096 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:01:54,096 INFO L93 Difference]: Finished difference Result 254 states and 270 transitions. [2021-11-03 05:01:54,096 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-11-03 05:01:54,096 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 2.1818181818181817) internal successors, (72), 32 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) Word has length 36 [2021-11-03 05:01:54,096 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:01:54,097 INFO L225 Difference]: With dead ends: 254 [2021-11-03 05:01:54,097 INFO L226 Difference]: Without dead ends: 227 [2021-11-03 05:01:54,098 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 85 SyntacticMatches, 0 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1379 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=664, Invalid=3758, Unknown=0, NotChecked=0, Total=4422 [2021-11-03 05:01:54,098 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 227 states. [2021-11-03 05:01:54,127 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 227 to 45. [2021-11-03 05:01:54,127 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 44 states have (on average 1.2272727272727273) internal successors, (54), 44 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) [2021-11-03 05:01:54,128 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 54 transitions. [2021-11-03 05:01:54,128 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 54 transitions. Word has length 36 [2021-11-03 05:01:54,128 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:01:54,128 INFO L470 AbstractCegarLoop]: Abstraction has 45 states and 54 transitions. [2021-11-03 05:01:54,128 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 2.1818181818181817) internal successors, (72), 32 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) [2021-11-03 05:01:54,129 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 54 transitions. [2021-11-03 05:01:54,129 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-11-03 05:01:54,129 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:01:54,129 INFO L513 BasicCegarLoop]: trace histogram [8, 7, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:01:54,173 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Forceful destruction successful, exit code 0 [2021-11-03 05:01:54,353 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1013 [2021-11-03 05:01:54,353 INFO L402 AbstractCegarLoop]: === Iteration 42 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:01:54,353 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:01:54,353 INFO L85 PathProgramCache]: Analyzing trace with hash -1542568095, now seen corresponding path program 21 times [2021-11-03 05:01:54,353 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:01:54,353 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [101406799] [2021-11-03 05:01:54,353 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:01:54,354 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:01:54,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:01:54,523 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 58 proven. 41 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:01:54,523 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:01:54,523 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [101406799] [2021-11-03 05:01:54,523 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [101406799] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 05:01:54,523 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1917040753] [2021-11-03 05:01:54,523 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-03 05:01:54,523 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:01:54,523 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 05:01:54,524 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 05:01:54,548 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Waiting until timeout for monitored process [2021-11-03 05:01:55,701 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-03 05:01:55,702 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 05:01:55,703 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-03 05:01:55,703 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:01:56,059 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 77 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:01:56,059 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:01:56,167 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 77 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:01:56,167 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1917040753] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 05:01:56,167 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1072222943] [2021-11-03 05:01:56,168 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-03 05:01:56,168 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 05:01:56,168 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 05:01:56,168 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 05:01:56,169 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 05:01:56,170 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:56,171 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:01:56,171 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:56,171 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 05:01:56,171 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:01:56,172 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:56,172 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 05:01:56,173 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 111 [2021-11-03 05:01:56,174 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_47|], 10=[|v_#valid_48|]} [2021-11-03 05:01:56,178 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:01:56,178 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 [2021-11-03 05:01:56,178 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:56,179 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:01:56,179 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:56,179 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:01:56,179 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 05:01:56,180 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:56,181 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:56,183 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:01:56,186 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:01:56,187 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:01:56,189 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:01:56,190 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 [2021-11-03 05:01:56,190 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:56,191 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:01:56,191 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:56,192 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:01:56,192 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 05:01:56,192 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:56,193 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:56,194 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:56,194 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 05:01:56,195 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 05:01:56,195 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:108, output treesize:93 [2021-11-03 05:01:56,198 INFO L180 QuantifierPusher]: treesize reduction 16, result has 87.0 percent of original size [2021-11-03 05:01:56,199 INFO L185 QuantifierPusher]: treesize reduction 7, result has 92.9 percent of original size 91 [2021-11-03 05:01:56,201 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:56,204 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:56,208 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:56,221 INFO L180 QuantifierPusher]: treesize reduction 6, result has 97.7 percent of original size [2021-11-03 05:01:56,224 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 249 [2021-11-03 05:01:56,226 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:56,238 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:56,238 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:56,239 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:56,239 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:56,239 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:56,241 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:56,242 INFO L180 QuantifierPusher]: treesize reduction 24, result has 70.7 percent of original size [2021-11-03 05:01:56,243 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 49 [2021-11-03 05:01:56,246 INFO L180 QuantifierPusher]: treesize reduction 25, result has 71.9 percent of original size [2021-11-03 05:01:56,247 INFO L185 QuantifierPusher]: treesize reduction 5, result has 90.6 percent of original size 48 [2021-11-03 05:01:56,248 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:56,251 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:56,266 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:56,273 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:56,275 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 120 [2021-11-03 05:01:56,276 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:56,281 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:56,282 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:56,282 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:56,283 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:56,283 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:56,284 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:56,286 INFO L180 QuantifierPusher]: treesize reduction 24, result has 71.8 percent of original size [2021-11-03 05:01:56,287 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 52 [2021-11-03 05:01:56,290 INFO L180 QuantifierPusher]: treesize reduction 25, result has 78.6 percent of original size [2021-11-03 05:01:56,291 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 90 [2021-11-03 05:01:56,293 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:56,296 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:56,297 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:56,297 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:56,298 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:56,299 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:56,301 INFO L180 QuantifierPusher]: treesize reduction 24, result has 78.2 percent of original size [2021-11-03 05:01:56,302 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 80 [2021-11-03 05:01:56,306 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 05:01:56,940 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 05:01:56,940 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 05:01:56,941 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 31 [2021-11-03 05:01:56,941 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1607829977] [2021-11-03 05:01:56,941 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-03 05:01:56,941 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:01:56,941 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-03 05:01:56,942 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=232, Invalid=1328, Unknown=0, NotChecked=0, Total=1560 [2021-11-03 05:01:56,942 INFO L87 Difference]: Start difference. First operand 45 states and 54 transitions. Second operand has 32 states, 32 states have (on average 2.21875) internal successors, (71), 31 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) [2021-11-03 05:01:57,431 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:01:57,431 INFO L93 Difference]: Finished difference Result 281 states and 298 transitions. [2021-11-03 05:01:57,431 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-11-03 05:01:57,432 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 2.21875) internal successors, (71), 31 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 36 [2021-11-03 05:01:57,432 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:01:57,433 INFO L225 Difference]: With dead ends: 281 [2021-11-03 05:01:57,433 INFO L226 Difference]: Without dead ends: 254 [2021-11-03 05:01:57,433 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 86 SyntacticMatches, 0 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1116 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=579, Invalid=3203, Unknown=0, NotChecked=0, Total=3782 [2021-11-03 05:01:57,435 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 254 states. [2021-11-03 05:01:57,458 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 254 to 45. [2021-11-03 05:01:57,458 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 44 states have (on average 1.2272727272727273) internal successors, (54), 44 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) [2021-11-03 05:01:57,458 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 54 transitions. [2021-11-03 05:01:57,459 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 54 transitions. Word has length 36 [2021-11-03 05:01:57,459 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:01:57,459 INFO L470 AbstractCegarLoop]: Abstraction has 45 states and 54 transitions. [2021-11-03 05:01:57,459 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 2.21875) internal successors, (71), 31 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) [2021-11-03 05:01:57,459 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 54 transitions. [2021-11-03 05:01:57,459 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-11-03 05:01:57,459 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:01:57,459 INFO L513 BasicCegarLoop]: trace histogram [8, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:01:57,482 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Ended with exit code 0 [2021-11-03 05:01:57,660 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1042,42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:01:57,660 INFO L402 AbstractCegarLoop]: === Iteration 43 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:01:57,660 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:01:57,660 INFO L85 PathProgramCache]: Analyzing trace with hash -1803486286, now seen corresponding path program 7 times [2021-11-03 05:01:57,660 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:01:57,660 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [959077377] [2021-11-03 05:01:57,660 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:01:57,661 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:01:57,674 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:01:57,835 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 58 proven. 47 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:01:57,836 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:01:57,836 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [959077377] [2021-11-03 05:01:57,836 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [959077377] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 05:01:57,836 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [330477959] [2021-11-03 05:01:57,836 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-03 05:01:57,836 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:01:57,836 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 05:01:57,837 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 05:01:57,860 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Waiting until timeout for monitored process [2021-11-03 05:01:59,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:01:59,026 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-03 05:01:59,027 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:01:59,363 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 77 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:01:59,363 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:01:59,469 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 77 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:01:59,470 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [330477959] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 05:01:59,470 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [171675126] [2021-11-03 05:01:59,471 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-03 05:01:59,471 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 05:01:59,471 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 05:01:59,471 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 05:01:59,471 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 05:01:59,474 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:59,474 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:01:59,474 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:59,474 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 05:01:59,475 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:01:59,475 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:59,475 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 05:01:59,476 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 111 [2021-11-03 05:01:59,477 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_48|], 10=[|v_#valid_49|]} [2021-11-03 05:01:59,481 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:01:59,482 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 [2021-11-03 05:01:59,482 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:59,482 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:01:59,482 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:59,483 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:01:59,483 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 05:01:59,483 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:59,484 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:59,486 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:01:59,487 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:01:59,488 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:01:59,490 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:01:59,491 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 [2021-11-03 05:01:59,491 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:59,492 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:01:59,492 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:59,493 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:01:59,493 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 05:01:59,493 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:59,494 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:59,495 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:59,495 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 05:01:59,496 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 05:01:59,496 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:108, output treesize:93 [2021-11-03 05:01:59,499 INFO L180 QuantifierPusher]: treesize reduction 16, result has 87.0 percent of original size [2021-11-03 05:01:59,500 INFO L185 QuantifierPusher]: treesize reduction 7, result has 92.9 percent of original size 91 [2021-11-03 05:01:59,502 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:59,505 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:59,510 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:59,520 INFO L180 QuantifierPusher]: treesize reduction 6, result has 97.7 percent of original size [2021-11-03 05:01:59,526 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 249 [2021-11-03 05:01:59,530 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:59,543 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:59,544 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:59,544 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:59,545 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:59,545 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:59,546 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:59,548 INFO L180 QuantifierPusher]: treesize reduction 24, result has 70.7 percent of original size [2021-11-03 05:01:59,549 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 49 [2021-11-03 05:01:59,553 INFO L180 QuantifierPusher]: treesize reduction 26, result has 78.5 percent of original size [2021-11-03 05:01:59,554 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 90 [2021-11-03 05:01:59,556 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:59,560 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:59,561 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:59,561 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:59,562 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:59,565 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:59,568 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:01:59,570 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 138 [2021-11-03 05:01:59,572 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:59,578 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:59,578 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:59,578 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:59,579 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:59,579 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:59,580 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:59,580 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:59,583 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:01:59,591 INFO L180 QuantifierPusher]: treesize reduction 30, result has 74.1 percent of original size [2021-11-03 05:01:59,593 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 80 [2021-11-03 05:01:59,598 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 05:02:00,287 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 05:02:00,288 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 05:02:00,288 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 30 [2021-11-03 05:02:00,288 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1080363414] [2021-11-03 05:02:00,288 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2021-11-03 05:02:00,288 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:02:00,288 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-11-03 05:02:00,289 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=233, Invalid=1249, Unknown=0, NotChecked=0, Total=1482 [2021-11-03 05:02:00,289 INFO L87 Difference]: Start difference. First operand 45 states and 54 transitions. Second operand has 31 states, 31 states have (on average 2.225806451612903) internal successors, (69), 30 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:02:00,780 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:02:00,781 INFO L93 Difference]: Finished difference Result 309 states and 328 transitions. [2021-11-03 05:02:00,781 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-03 05:02:00,781 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 2.225806451612903) internal successors, (69), 30 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 36 [2021-11-03 05:02:00,781 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:02:00,783 INFO L225 Difference]: With dead ends: 309 [2021-11-03 05:02:00,783 INFO L226 Difference]: Without dead ends: 282 [2021-11-03 05:02:00,784 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 87 SyntacticMatches, 0 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 821 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=488, Invalid=2482, Unknown=0, NotChecked=0, Total=2970 [2021-11-03 05:02:00,785 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 282 states. [2021-11-03 05:02:00,818 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 282 to 46. [2021-11-03 05:02:00,818 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 45 states have (on average 1.2444444444444445) internal successors, (56), 45 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) [2021-11-03 05:02:00,819 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 56 transitions. [2021-11-03 05:02:00,819 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 56 transitions. Word has length 36 [2021-11-03 05:02:00,819 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:02:00,821 INFO L470 AbstractCegarLoop]: Abstraction has 46 states and 56 transitions. [2021-11-03 05:02:00,821 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 2.225806451612903) internal successors, (69), 30 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:02:00,822 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 56 transitions. [2021-11-03 05:02:00,822 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-11-03 05:02:00,822 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:02:00,822 INFO L513 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:02:00,864 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Forceful destruction successful, exit code 0 [2021-11-03 05:02:01,037 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1071,43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:02:01,037 INFO L402 AbstractCegarLoop]: === Iteration 44 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:02:01,037 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:02:01,037 INFO L85 PathProgramCache]: Analyzing trace with hash 1960887109, now seen corresponding path program 14 times [2021-11-03 05:02:01,037 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:02:01,037 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1652724196] [2021-11-03 05:02:01,037 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:02:01,038 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:02:01,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:02:01,131 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 28 proven. 85 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:02:01,132 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:02:01,132 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1652724196] [2021-11-03 05:02:01,132 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1652724196] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 05:02:01,132 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1450693963] [2021-11-03 05:02:01,132 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-03 05:02:01,132 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:02:01,134 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 05:02:01,135 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 05:02:01,160 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Waiting until timeout for monitored process [2021-11-03 05:02:02,280 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2021-11-03 05:02:02,281 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 05:02:02,282 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-03 05:02:02,283 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:02:02,379 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 36 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:02:02,379 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:02:02,476 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 36 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:02:02,476 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1450693963] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 05:02:02,477 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1547255942] [2021-11-03 05:02:02,478 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-03 05:02:02,478 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 05:02:02,478 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 05:02:02,478 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 05:02:02,478 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 05:02:02,502 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:02:02,502 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:02:02,502 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:02:02,503 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 05:02:02,503 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:02:02,503 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:02:02,504 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 05:02:02,504 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 111 [2021-11-03 05:02:02,506 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_49|], 10=[|v_#valid_50|]} [2021-11-03 05:02:02,510 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:02:02,511 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 [2021-11-03 05:02:02,511 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:02:02,511 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:02:02,512 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:02:02,512 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:02:02,512 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 05:02:02,512 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:02,514 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:02:02,516 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:02:02,517 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:02:02,518 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:02:02,521 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:02:02,521 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 [2021-11-03 05:02:02,522 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:02:02,523 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:02:02,523 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:02:02,524 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:02:02,524 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 05:02:02,524 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:02,526 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:02:02,526 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:02:02,527 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 05:02:02,527 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 05:02:02,527 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:108, output treesize:93 [2021-11-03 05:02:02,532 INFO L180 QuantifierPusher]: treesize reduction 17, result has 86.9 percent of original size [2021-11-03 05:02:02,534 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 108 [2021-11-03 05:02:02,535 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:02,541 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:02,547 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:02,560 INFO L180 QuantifierPusher]: treesize reduction 17, result has 94.1 percent of original size [2021-11-03 05:02:02,563 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 269 [2021-11-03 05:02:02,567 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:02,579 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:02,580 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:02,580 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:02,581 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:02,581 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:02,582 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:02,585 INFO L180 QuantifierPusher]: treesize reduction 30, result has 67.0 percent of original size [2021-11-03 05:02:02,585 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 52 [2021-11-03 05:02:02,589 INFO L180 QuantifierPusher]: treesize reduction 31, result has 74.8 percent of original size [2021-11-03 05:02:02,590 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 87 [2021-11-03 05:02:02,591 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:02,595 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:02,595 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:02,596 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:02,596 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:02,598 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:02,601 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:02:02,603 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 138 [2021-11-03 05:02:02,605 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:02,610 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:02,611 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:02,611 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:02,612 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:02,612 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:02,612 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:02,613 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:02,614 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:02,617 INFO L180 QuantifierPusher]: treesize reduction 30, result has 74.1 percent of original size [2021-11-03 05:02:02,618 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 80 [2021-11-03 05:02:02,622 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 05:02:03,200 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 05:02:03,201 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 05:02:03,201 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 13 [2021-11-03 05:02:03,201 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [27767168] [2021-11-03 05:02:03,201 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-03 05:02:03,201 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:02:03,202 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-03 05:02:03,202 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=363, Unknown=0, NotChecked=0, Total=462 [2021-11-03 05:02:03,202 INFO L87 Difference]: Start difference. First operand 46 states and 56 transitions. Second operand has 14 states, 14 states have (on average 3.142857142857143) internal successors, (44), 13 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) [2021-11-03 05:02:03,427 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:02:03,427 INFO L93 Difference]: Finished difference Result 57 states and 67 transitions. [2021-11-03 05:02:03,427 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-11-03 05:02:03,427 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 3.142857142857143) internal successors, (44), 13 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) Word has length 37 [2021-11-03 05:02:03,427 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:02:03,428 INFO L225 Difference]: With dead ends: 57 [2021-11-03 05:02:03,428 INFO L226 Difference]: Without dead ends: 55 [2021-11-03 05:02:03,428 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 105 SyntacticMatches, 2 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 266 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=232, Invalid=760, Unknown=0, NotChecked=0, Total=992 [2021-11-03 05:02:03,428 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2021-11-03 05:02:03,460 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 49. [2021-11-03 05:02:03,460 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 48 states have (on average 1.2291666666666667) internal successors, (59), 48 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) [2021-11-03 05:02:03,460 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 59 transitions. [2021-11-03 05:02:03,460 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 59 transitions. Word has length 37 [2021-11-03 05:02:03,461 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:02:03,461 INFO L470 AbstractCegarLoop]: Abstraction has 49 states and 59 transitions. [2021-11-03 05:02:03,461 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 3.142857142857143) internal successors, (44), 13 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) [2021-11-03 05:02:03,461 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 59 transitions. [2021-11-03 05:02:03,461 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-11-03 05:02:03,462 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:02:03,462 INFO L513 BasicCegarLoop]: trace histogram [9, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:02:03,502 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Forceful destruction successful, exit code 0 [2021-11-03 05:02:03,682 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1099 [2021-11-03 05:02:03,682 INFO L402 AbstractCegarLoop]: === Iteration 45 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:02:03,682 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:02:03,683 INFO L85 PathProgramCache]: Analyzing trace with hash 942514443, now seen corresponding path program 15 times [2021-11-03 05:02:03,683 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:02:03,683 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1564311762] [2021-11-03 05:02:03,683 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:02:03,683 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:02:03,696 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:02:03,900 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 78 proven. 58 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:02:03,901 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:02:03,901 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1564311762] [2021-11-03 05:02:03,901 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1564311762] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 05:02:03,901 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1597669608] [2021-11-03 05:02:03,901 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-03 05:02:03,901 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:02:03,901 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 05:02:03,905 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 05:02:03,923 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Waiting until timeout for monitored process [2021-11-03 05:02:05,095 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-03 05:02:05,095 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 05:02:05,096 INFO L263 TraceCheckSpWp]: Trace formula consists of 171 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-03 05:02:05,097 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:02:05,642 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 100 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:02:05,642 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:02:05,762 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 100 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:02:05,762 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1597669608] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 05:02:05,763 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1906998019] [2021-11-03 05:02:05,763 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-03 05:02:05,763 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 05:02:05,763 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 05:02:05,764 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 05:02:05,764 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 05:02:05,769 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:02:05,769 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:02:05,771 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:02:05,771 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 05:02:05,771 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:02:05,771 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:02:05,772 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 05:02:05,772 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 111 [2021-11-03 05:02:05,773 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_50|], 10=[|v_#valid_51|]} [2021-11-03 05:02:05,779 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:02:05,780 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 [2021-11-03 05:02:05,780 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:02:05,780 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:02:05,781 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:02:05,781 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:02:05,781 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 05:02:05,781 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:05,783 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:02:05,786 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:02:05,787 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:02:05,787 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:02:05,790 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:02:05,795 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 [2021-11-03 05:02:05,796 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:02:05,797 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:02:05,797 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:02:05,797 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:02:05,797 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 05:02:05,799 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:05,800 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:02:05,801 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:02:05,801 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 05:02:05,802 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 05:02:05,802 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:108, output treesize:93 [2021-11-03 05:02:05,806 INFO L180 QuantifierPusher]: treesize reduction 17, result has 86.9 percent of original size [2021-11-03 05:02:05,807 INFO L185 QuantifierPusher]: treesize reduction 5, result has 95.1 percent of original size 97 [2021-11-03 05:02:05,810 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:05,815 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:05,819 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:05,829 INFO L180 QuantifierPusher]: treesize reduction 12, result has 95.7 percent of original size [2021-11-03 05:02:05,832 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 267 [2021-11-03 05:02:05,835 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:05,873 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:05,874 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:05,875 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:05,875 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:05,876 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:05,878 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:05,882 INFO L180 QuantifierPusher]: treesize reduction 30, result has 67.0 percent of original size [2021-11-03 05:02:05,883 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 52 [2021-11-03 05:02:05,888 INFO L180 QuantifierPusher]: treesize reduction 31, result has 74.8 percent of original size [2021-11-03 05:02:05,890 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 90 [2021-11-03 05:02:05,892 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:05,898 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:05,898 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:05,899 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:05,900 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:05,901 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:05,906 INFO L180 QuantifierPusher]: treesize reduction 30, result has 74.1 percent of original size [2021-11-03 05:02:05,907 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 80 [2021-11-03 05:02:05,912 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 05:02:06,621 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 05:02:06,622 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 05:02:06,622 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 41 [2021-11-03 05:02:06,622 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [866402216] [2021-11-03 05:02:06,622 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2021-11-03 05:02:06,622 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:02:06,622 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-11-03 05:02:06,623 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=376, Invalid=2074, Unknown=0, NotChecked=0, Total=2450 [2021-11-03 05:02:06,623 INFO L87 Difference]: Start difference. First operand 49 states and 59 transitions. Second operand has 42 states, 42 states have (on average 2.0) internal successors, (84), 41 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) [2021-11-03 05:02:07,027 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:02:07,027 INFO L93 Difference]: Finished difference Result 116 states and 128 transitions. [2021-11-03 05:02:07,027 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-11-03 05:02:07,027 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 2.0) internal successors, (84), 41 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 40 [2021-11-03 05:02:07,027 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:02:07,028 INFO L225 Difference]: With dead ends: 116 [2021-11-03 05:02:07,028 INFO L226 Difference]: Without dead ends: 86 [2021-11-03 05:02:07,029 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 156 GetRequests, 90 SyntacticMatches, 0 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1546 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=721, Invalid=3835, Unknown=0, NotChecked=0, Total=4556 [2021-11-03 05:02:07,029 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2021-11-03 05:02:07,055 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 50. [2021-11-03 05:02:07,055 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 49 states have (on average 1.2244897959183674) internal successors, (60), 49 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) [2021-11-03 05:02:07,056 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 60 transitions. [2021-11-03 05:02:07,056 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 60 transitions. Word has length 40 [2021-11-03 05:02:07,056 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:02:07,056 INFO L470 AbstractCegarLoop]: Abstraction has 50 states and 60 transitions. [2021-11-03 05:02:07,056 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 42 states have (on average 2.0) internal successors, (84), 41 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) [2021-11-03 05:02:07,057 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 60 transitions. [2021-11-03 05:02:07,057 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-11-03 05:02:07,057 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:02:07,057 INFO L513 BasicCegarLoop]: trace histogram [9, 8, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:02:07,090 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Forceful destruction successful, exit code 0 [2021-11-03 05:02:07,270 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1127 [2021-11-03 05:02:07,270 INFO L402 AbstractCegarLoop]: === Iteration 46 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:02:07,270 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:02:07,271 INFO L85 PathProgramCache]: Analyzing trace with hash -1406409700, now seen corresponding path program 22 times [2021-11-03 05:02:07,271 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:02:07,271 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1914451000] [2021-11-03 05:02:07,271 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:02:07,271 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:02:07,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:02:07,475 INFO L134 CoverageAnalysis]: Checked inductivity of 129 backedges. 78 proven. 51 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:02:07,475 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:02:07,475 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1914451000] [2021-11-03 05:02:07,475 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1914451000] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 05:02:07,476 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1305710860] [2021-11-03 05:02:07,476 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-03 05:02:07,476 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:02:07,476 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 05:02:07,476 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 05:02:07,477 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Waiting until timeout for monitored process [2021-11-03 05:02:08,552 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:02:08,553 INFO L263 TraceCheckSpWp]: Trace formula consists of 171 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-03 05:02:08,553 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:02:09,065 INFO L134 CoverageAnalysis]: Checked inductivity of 129 backedges. 100 proven. 29 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:02:09,066 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:02:09,203 INFO L134 CoverageAnalysis]: Checked inductivity of 129 backedges. 100 proven. 29 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:02:09,203 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1305710860] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 05:02:09,203 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1049798972] [2021-11-03 05:02:09,204 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-03 05:02:09,204 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 05:02:09,204 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 05:02:09,205 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 05:02:09,205 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 05:02:09,206 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:02:09,207 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:02:09,207 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:02:09,207 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 05:02:09,207 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:02:09,208 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:02:09,208 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 05:02:09,209 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 111 [2021-11-03 05:02:09,210 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_51|], 10=[|v_#valid_52|]} [2021-11-03 05:02:09,214 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:02:09,214 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 [2021-11-03 05:02:09,215 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:02:09,215 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:02:09,215 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:02:09,215 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:02:09,216 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 05:02:09,216 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:09,217 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:02:09,221 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:02:09,221 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:02:09,222 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:02:09,225 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:02:09,225 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 [2021-11-03 05:02:09,226 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:02:09,227 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:02:09,227 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:02:09,227 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:02:09,227 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 05:02:09,228 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:09,229 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:02:09,229 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:02:09,230 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 05:02:09,230 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 05:02:09,230 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:108, output treesize:93 [2021-11-03 05:02:09,233 INFO L180 QuantifierPusher]: treesize reduction 16, result has 87.0 percent of original size [2021-11-03 05:02:09,235 INFO L185 QuantifierPusher]: treesize reduction 5, result has 94.8 percent of original size 91 [2021-11-03 05:02:09,236 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:09,240 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:09,244 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:09,254 INFO L180 QuantifierPusher]: treesize reduction 6, result has 97.7 percent of original size [2021-11-03 05:02:09,256 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 249 [2021-11-03 05:02:09,267 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:09,282 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:09,282 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:09,283 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:09,283 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:09,283 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:09,285 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:09,287 INFO L180 QuantifierPusher]: treesize reduction 24, result has 70.7 percent of original size [2021-11-03 05:02:09,288 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 49 [2021-11-03 05:02:09,291 INFO L180 QuantifierPusher]: treesize reduction 25, result has 71.9 percent of original size [2021-11-03 05:02:09,292 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 57 [2021-11-03 05:02:09,293 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:09,295 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:09,298 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:09,303 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:02:09,304 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 122 [2021-11-03 05:02:09,306 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:09,311 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:09,312 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:09,312 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:09,313 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:09,313 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:09,314 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:09,316 INFO L180 QuantifierPusher]: treesize reduction 24, result has 71.8 percent of original size [2021-11-03 05:02:09,317 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 52 [2021-11-03 05:02:09,320 INFO L180 QuantifierPusher]: treesize reduction 25, result has 78.6 percent of original size [2021-11-03 05:02:09,321 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 87 [2021-11-03 05:02:09,323 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:09,347 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:09,347 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:09,348 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:09,348 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:09,349 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:09,352 INFO L180 QuantifierPusher]: treesize reduction 24, result has 78.2 percent of original size [2021-11-03 05:02:09,353 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 80 [2021-11-03 05:02:09,356 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 05:02:09,989 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 05:02:09,989 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 05:02:09,989 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 40 [2021-11-03 05:02:09,990 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1286666373] [2021-11-03 05:02:09,990 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2021-11-03 05:02:09,990 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:02:09,990 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-11-03 05:02:09,990 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=339, Invalid=2013, Unknown=0, NotChecked=0, Total=2352 [2021-11-03 05:02:09,990 INFO L87 Difference]: Start difference. First operand 50 states and 60 transitions. Second operand has 41 states, 41 states have (on average 2.048780487804878) internal successors, (84), 40 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) [2021-11-03 05:02:10,512 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:02:10,512 INFO L93 Difference]: Finished difference Result 152 states and 165 transitions. [2021-11-03 05:02:10,512 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-11-03 05:02:10,513 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 2.048780487804878) internal successors, (84), 40 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 40 [2021-11-03 05:02:10,513 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:02:10,513 INFO L225 Difference]: With dead ends: 152 [2021-11-03 05:02:10,513 INFO L226 Difference]: Without dead ends: 122 [2021-11-03 05:02:10,514 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 91 SyntacticMatches, 0 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1821 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=814, Invalid=4588, Unknown=0, NotChecked=0, Total=5402 [2021-11-03 05:02:10,514 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2021-11-03 05:02:10,540 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 50. [2021-11-03 05:02:10,541 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 49 states have (on average 1.2244897959183674) internal successors, (60), 49 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) [2021-11-03 05:02:10,541 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 60 transitions. [2021-11-03 05:02:10,541 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 60 transitions. Word has length 40 [2021-11-03 05:02:10,541 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:02:10,541 INFO L470 AbstractCegarLoop]: Abstraction has 50 states and 60 transitions. [2021-11-03 05:02:10,541 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 41 states have (on average 2.048780487804878) internal successors, (84), 40 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) [2021-11-03 05:02:10,541 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 60 transitions. [2021-11-03 05:02:10,542 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-11-03 05:02:10,542 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:02:10,542 INFO L513 BasicCegarLoop]: trace histogram [9, 8, 8, 6, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:02:10,565 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Forceful destruction successful, exit code 0 [2021-11-03 05:02:10,742 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1146,46 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:02:10,742 INFO L402 AbstractCegarLoop]: === Iteration 47 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:02:10,743 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:02:10,743 INFO L85 PathProgramCache]: Analyzing trace with hash 180386539, now seen corresponding path program 23 times [2021-11-03 05:02:10,743 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:02:10,743 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [694601882] [2021-11-03 05:02:10,743 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:02:10,743 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:02:10,778 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:02:10,968 INFO L134 CoverageAnalysis]: Checked inductivity of 124 backedges. 78 proven. 46 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:02:10,968 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:02:10,969 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [694601882] [2021-11-03 05:02:10,969 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [694601882] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 05:02:10,969 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [394165558] [2021-11-03 05:02:10,969 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-03 05:02:10,969 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:02:10,969 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 05:02:10,970 INFO L229 MonitoredProcess]: Starting monitored process 47 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 05:02:10,971 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Waiting until timeout for monitored process [2021-11-03 05:02:12,116 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2021-11-03 05:02:12,117 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 05:02:12,118 INFO L263 TraceCheckSpWp]: Trace formula consists of 171 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-03 05:02:12,119 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:02:12,598 INFO L134 CoverageAnalysis]: Checked inductivity of 124 backedges. 100 proven. 24 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:02:12,598 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:02:12,733 INFO L134 CoverageAnalysis]: Checked inductivity of 124 backedges. 100 proven. 24 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:02:12,733 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [394165558] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 05:02:12,733 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1785019923] [2021-11-03 05:02:12,734 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-03 05:02:12,734 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 05:02:12,734 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 05:02:12,734 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 05:02:12,734 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 05:02:12,736 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:02:12,736 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:02:12,737 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:02:12,737 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 05:02:12,737 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:02:12,737 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:02:12,737 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 05:02:12,738 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 111 [2021-11-03 05:02:12,739 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_52|], 10=[|v_#valid_53|]} [2021-11-03 05:02:12,743 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:02:12,744 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 [2021-11-03 05:02:12,744 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:02:12,744 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:02:12,745 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:02:12,745 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:02:12,745 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 05:02:12,745 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:12,747 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:02:12,749 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:02:12,749 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:02:12,750 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:02:12,753 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:02:12,755 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 [2021-11-03 05:02:12,755 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:02:12,756 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:02:12,757 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:02:12,757 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:02:12,757 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 05:02:12,757 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:12,759 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:02:12,759 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:02:12,760 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 05:02:12,760 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 05:02:12,760 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:108, output treesize:93 [2021-11-03 05:02:12,763 INFO L180 QuantifierPusher]: treesize reduction 16, result has 87.0 percent of original size [2021-11-03 05:02:12,764 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 102 [2021-11-03 05:02:12,766 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:12,769 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:12,773 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:12,783 INFO L180 QuantifierPusher]: treesize reduction 6, result has 97.7 percent of original size [2021-11-03 05:02:12,785 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 251 [2021-11-03 05:02:12,788 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:12,798 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:12,798 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:12,799 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:12,799 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:12,800 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:12,801 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:12,803 INFO L180 QuantifierPusher]: treesize reduction 24, result has 70.7 percent of original size [2021-11-03 05:02:12,804 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 49 [2021-11-03 05:02:12,806 INFO L180 QuantifierPusher]: treesize reduction 25, result has 71.9 percent of original size [2021-11-03 05:02:12,807 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 57 [2021-11-03 05:02:12,808 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:12,811 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:12,815 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:12,820 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:02:12,821 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 122 [2021-11-03 05:02:12,837 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:12,843 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:12,843 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:12,844 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:12,844 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:12,845 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:12,846 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:12,848 INFO L180 QuantifierPusher]: treesize reduction 24, result has 71.8 percent of original size [2021-11-03 05:02:12,849 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 52 [2021-11-03 05:02:12,852 INFO L180 QuantifierPusher]: treesize reduction 25, result has 78.6 percent of original size [2021-11-03 05:02:12,853 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 90 [2021-11-03 05:02:12,854 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:12,860 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:12,860 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:12,861 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:12,861 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:12,863 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:12,865 INFO L180 QuantifierPusher]: treesize reduction 24, result has 78.2 percent of original size [2021-11-03 05:02:12,867 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 80 [2021-11-03 05:02:12,873 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 05:02:13,542 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 05:02:13,542 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 05:02:13,542 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 39 [2021-11-03 05:02:13,542 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1179644315] [2021-11-03 05:02:13,543 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2021-11-03 05:02:13,543 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:02:13,543 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-11-03 05:02:13,543 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=318, Invalid=1938, Unknown=0, NotChecked=0, Total=2256 [2021-11-03 05:02:13,543 INFO L87 Difference]: Start difference. First operand 50 states and 60 transitions. Second operand has 40 states, 40 states have (on average 2.075) internal successors, (83), 39 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) [2021-11-03 05:02:14,153 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:02:14,153 INFO L93 Difference]: Finished difference Result 187 states and 201 transitions. [2021-11-03 05:02:14,153 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-11-03 05:02:14,153 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 2.075) internal successors, (83), 39 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 40 [2021-11-03 05:02:14,153 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:02:14,154 INFO L225 Difference]: With dead ends: 187 [2021-11-03 05:02:14,154 INFO L226 Difference]: Without dead ends: 157 [2021-11-03 05:02:14,154 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 168 GetRequests, 92 SyntacticMatches, 0 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2014 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=900, Invalid=5106, Unknown=0, NotChecked=0, Total=6006 [2021-11-03 05:02:14,155 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 157 states. [2021-11-03 05:02:14,185 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 157 to 50. [2021-11-03 05:02:14,185 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 49 states have (on average 1.2244897959183674) internal successors, (60), 49 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) [2021-11-03 05:02:14,185 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 60 transitions. [2021-11-03 05:02:14,185 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 60 transitions. Word has length 40 [2021-11-03 05:02:14,186 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:02:14,186 INFO L470 AbstractCegarLoop]: Abstraction has 50 states and 60 transitions. [2021-11-03 05:02:14,186 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 2.075) internal successors, (83), 39 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) [2021-11-03 05:02:14,186 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 60 transitions. [2021-11-03 05:02:14,186 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-11-03 05:02:14,186 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:02:14,186 INFO L513 BasicCegarLoop]: trace histogram [9, 8, 8, 5, 3, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:02:14,223 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Ended with exit code 0 [2021-11-03 05:02:14,401 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1175,47 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:02:14,401 INFO L402 AbstractCegarLoop]: === Iteration 48 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:02:14,401 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:02:14,401 INFO L85 PathProgramCache]: Analyzing trace with hash 1894141500, now seen corresponding path program 24 times [2021-11-03 05:02:14,401 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:02:14,401 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [308130081] [2021-11-03 05:02:14,401 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:02:14,401 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:02:14,415 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:02:14,590 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 78 proven. 43 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:02:14,591 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:02:14,591 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [308130081] [2021-11-03 05:02:14,591 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [308130081] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 05:02:14,591 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1242296897] [2021-11-03 05:02:14,591 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-03 05:02:14,591 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:02:14,591 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 05:02:14,592 INFO L229 MonitoredProcess]: Starting monitored process 48 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 05:02:14,593 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Waiting until timeout for monitored process [2021-11-03 05:02:15,779 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-03 05:02:15,779 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 05:02:15,780 INFO L263 TraceCheckSpWp]: Trace formula consists of 171 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-03 05:02:15,781 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:02:16,238 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 100 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:02:16,238 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:02:16,358 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 100 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:02:16,358 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1242296897] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 05:02:16,358 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [895759814] [2021-11-03 05:02:16,359 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-03 05:02:16,359 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 05:02:16,359 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 05:02:16,359 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 05:02:16,359 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 05:02:16,361 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:02:16,361 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:02:16,361 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:02:16,362 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 05:02:16,362 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:02:16,362 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:02:16,362 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 05:02:16,363 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 111 [2021-11-03 05:02:16,365 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_53|], 10=[|v_#valid_54|]} [2021-11-03 05:02:16,376 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:02:16,377 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 [2021-11-03 05:02:16,377 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:02:16,377 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:02:16,377 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:02:16,378 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:02:16,378 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 05:02:16,378 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:16,379 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:02:16,382 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:02:16,382 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:02:16,383 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:02:16,385 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:02:16,386 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 [2021-11-03 05:02:16,387 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:02:16,388 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:02:16,388 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:02:16,388 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:02:16,389 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 05:02:16,389 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:16,390 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:02:16,391 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:02:16,391 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 05:02:16,391 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 05:02:16,391 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:108, output treesize:93 [2021-11-03 05:02:16,395 INFO L180 QuantifierPusher]: treesize reduction 16, result has 87.0 percent of original size [2021-11-03 05:02:16,396 INFO L185 QuantifierPusher]: treesize reduction 7, result has 92.9 percent of original size 91 [2021-11-03 05:02:16,406 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:16,412 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:16,418 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:16,432 INFO L180 QuantifierPusher]: treesize reduction 6, result has 97.7 percent of original size [2021-11-03 05:02:16,434 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 249 [2021-11-03 05:02:16,437 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:16,448 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:16,449 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:16,449 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:16,450 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:16,450 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:16,452 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:16,455 INFO L180 QuantifierPusher]: treesize reduction 24, result has 70.7 percent of original size [2021-11-03 05:02:16,456 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 49 [2021-11-03 05:02:16,460 INFO L180 QuantifierPusher]: treesize reduction 25, result has 71.9 percent of original size [2021-11-03 05:02:16,461 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 57 [2021-11-03 05:02:16,463 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:16,467 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:16,471 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:16,478 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:02:16,481 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 122 [2021-11-03 05:02:16,483 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:16,492 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:16,493 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:16,494 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:16,495 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:16,495 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:16,497 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:16,500 INFO L180 QuantifierPusher]: treesize reduction 24, result has 71.8 percent of original size [2021-11-03 05:02:16,501 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 52 [2021-11-03 05:02:16,506 INFO L180 QuantifierPusher]: treesize reduction 25, result has 78.6 percent of original size [2021-11-03 05:02:16,508 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 87 [2021-11-03 05:02:16,510 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:16,515 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:16,516 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:16,516 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:16,517 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:16,518 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:16,522 INFO L180 QuantifierPusher]: treesize reduction 24, result has 78.2 percent of original size [2021-11-03 05:02:16,524 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 80 [2021-11-03 05:02:16,529 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 05:02:17,286 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 05:02:17,286 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 05:02:17,286 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 38 [2021-11-03 05:02:17,286 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [687051728] [2021-11-03 05:02:17,287 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2021-11-03 05:02:17,287 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:02:17,287 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-11-03 05:02:17,287 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=301, Invalid=1861, Unknown=0, NotChecked=0, Total=2162 [2021-11-03 05:02:17,287 INFO L87 Difference]: Start difference. First operand 50 states and 60 transitions. Second operand has 39 states, 39 states have (on average 2.1025641025641026) internal successors, (82), 38 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) [2021-11-03 05:02:17,991 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:02:17,991 INFO L93 Difference]: Finished difference Result 221 states and 236 transitions. [2021-11-03 05:02:17,991 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-11-03 05:02:17,991 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 2.1025641025641026) internal successors, (82), 38 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 40 [2021-11-03 05:02:17,992 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:02:17,993 INFO L225 Difference]: With dead ends: 221 [2021-11-03 05:02:17,993 INFO L226 Difference]: Without dead ends: 191 [2021-11-03 05:02:17,995 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 171 GetRequests, 93 SyntacticMatches, 0 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2102 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=946, Invalid=5374, Unknown=0, NotChecked=0, Total=6320 [2021-11-03 05:02:17,995 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 191 states. [2021-11-03 05:02:18,030 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 191 to 50. [2021-11-03 05:02:18,030 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 49 states have (on average 1.2244897959183674) internal successors, (60), 49 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) [2021-11-03 05:02:18,031 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 60 transitions. [2021-11-03 05:02:18,031 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 60 transitions. Word has length 40 [2021-11-03 05:02:18,031 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:02:18,031 INFO L470 AbstractCegarLoop]: Abstraction has 50 states and 60 transitions. [2021-11-03 05:02:18,031 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 39 states have (on average 2.1025641025641026) internal successors, (82), 38 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) [2021-11-03 05:02:18,031 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 60 transitions. [2021-11-03 05:02:18,031 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-11-03 05:02:18,031 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:02:18,031 INFO L513 BasicCegarLoop]: trace histogram [9, 8, 8, 4, 4, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:02:18,055 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Forceful destruction successful, exit code 0 [2021-11-03 05:02:18,232 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1204,48 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:02:18,232 INFO L402 AbstractCegarLoop]: === Iteration 49 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:02:18,232 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:02:18,232 INFO L85 PathProgramCache]: Analyzing trace with hash -1375712053, now seen corresponding path program 25 times [2021-11-03 05:02:18,232 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:02:18,232 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1477168784] [2021-11-03 05:02:18,233 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:02:18,233 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:02:18,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:02:18,403 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 78 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:02:18,404 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:02:18,404 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1477168784] [2021-11-03 05:02:18,404 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1477168784] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 05:02:18,404 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [721815701] [2021-11-03 05:02:18,404 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-03 05:02:18,404 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:02:18,404 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 05:02:18,405 INFO L229 MonitoredProcess]: Starting monitored process 49 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 05:02:18,406 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Waiting until timeout for monitored process [2021-11-03 05:02:19,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:02:19,636 INFO L263 TraceCheckSpWp]: Trace formula consists of 171 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-03 05:02:19,637 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:02:20,084 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 100 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:02:20,084 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:02:20,205 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 100 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:02:20,205 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [721815701] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 05:02:20,205 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [730672800] [2021-11-03 05:02:20,205 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-03 05:02:20,206 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 05:02:20,206 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 05:02:20,206 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 05:02:20,206 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 05:02:20,218 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:02:20,219 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:02:20,219 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:02:20,220 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 05:02:20,220 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:02:20,220 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:02:20,220 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 05:02:20,222 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 111 [2021-11-03 05:02:20,223 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_54|], 10=[|v_#valid_55|]} [2021-11-03 05:02:20,228 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:02:20,229 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 [2021-11-03 05:02:20,230 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:02:20,230 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:02:20,230 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:02:20,231 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:02:20,231 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 05:02:20,231 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:20,233 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:02:20,236 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:02:20,237 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:02:20,238 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:02:20,241 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:02:20,242 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 [2021-11-03 05:02:20,243 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:02:20,244 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:02:20,244 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:02:20,245 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:02:20,245 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 05:02:20,245 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:20,247 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:02:20,248 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:02:20,249 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 05:02:20,249 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 05:02:20,250 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:108, output treesize:93 [2021-11-03 05:02:20,254 INFO L180 QuantifierPusher]: treesize reduction 16, result has 87.0 percent of original size [2021-11-03 05:02:20,255 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 100 [2021-11-03 05:02:20,257 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:20,261 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:20,264 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:20,273 INFO L180 QuantifierPusher]: treesize reduction 11, result has 95.8 percent of original size [2021-11-03 05:02:20,276 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 251 [2021-11-03 05:02:20,278 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:20,289 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:20,290 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:20,290 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:20,290 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:20,291 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:20,292 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:20,294 INFO L180 QuantifierPusher]: treesize reduction 24, result has 70.7 percent of original size [2021-11-03 05:02:20,295 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 49 [2021-11-03 05:02:20,297 INFO L180 QuantifierPusher]: treesize reduction 25, result has 71.9 percent of original size [2021-11-03 05:02:20,298 INFO L185 QuantifierPusher]: treesize reduction 5, result has 90.6 percent of original size 48 [2021-11-03 05:02:20,299 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:20,302 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:20,305 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:20,310 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:02:20,311 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 120 [2021-11-03 05:02:20,313 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:20,318 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:20,319 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:20,319 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:20,320 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:20,320 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:20,321 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:20,323 INFO L180 QuantifierPusher]: treesize reduction 24, result has 71.8 percent of original size [2021-11-03 05:02:20,324 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 52 [2021-11-03 05:02:20,327 INFO L180 QuantifierPusher]: treesize reduction 25, result has 78.6 percent of original size [2021-11-03 05:02:20,328 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 90 [2021-11-03 05:02:20,330 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:20,333 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:20,334 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:20,334 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:20,334 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:20,335 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:20,338 INFO L180 QuantifierPusher]: treesize reduction 24, result has 78.2 percent of original size [2021-11-03 05:02:20,339 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 80 [2021-11-03 05:02:20,342 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 05:02:21,005 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 05:02:21,005 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 05:02:21,005 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 37 [2021-11-03 05:02:21,005 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1511858086] [2021-11-03 05:02:21,005 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2021-11-03 05:02:21,005 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:02:21,006 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-11-03 05:02:21,006 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=288, Invalid=1782, Unknown=0, NotChecked=0, Total=2070 [2021-11-03 05:02:21,006 INFO L87 Difference]: Start difference. First operand 50 states and 60 transitions. Second operand has 38 states, 38 states have (on average 2.1315789473684212) internal successors, (81), 37 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:02:21,836 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:02:21,836 INFO L93 Difference]: Finished difference Result 254 states and 270 transitions. [2021-11-03 05:02:21,836 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-11-03 05:02:21,836 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 2.1315789473684212) internal successors, (81), 37 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 40 [2021-11-03 05:02:21,836 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:02:21,838 INFO L225 Difference]: With dead ends: 254 [2021-11-03 05:02:21,838 INFO L226 Difference]: Without dead ends: 224 [2021-11-03 05:02:21,839 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 172 GetRequests, 94 SyntacticMatches, 0 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2079 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=946, Invalid=5374, Unknown=0, NotChecked=0, Total=6320 [2021-11-03 05:02:21,839 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 224 states. [2021-11-03 05:02:21,871 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 224 to 50. [2021-11-03 05:02:21,872 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 49 states have (on average 1.2244897959183674) internal successors, (60), 49 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) [2021-11-03 05:02:21,872 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 60 transitions. [2021-11-03 05:02:21,872 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 60 transitions. Word has length 40 [2021-11-03 05:02:21,872 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:02:21,872 INFO L470 AbstractCegarLoop]: Abstraction has 50 states and 60 transitions. [2021-11-03 05:02:21,872 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 2.1315789473684212) internal successors, (81), 37 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:02:21,872 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 60 transitions. [2021-11-03 05:02:21,872 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-11-03 05:02:21,872 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:02:21,873 INFO L513 BasicCegarLoop]: trace histogram [9, 8, 8, 5, 3, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:02:21,899 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Forceful destruction successful, exit code 0 [2021-11-03 05:02:22,077 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1233 [2021-11-03 05:02:22,077 INFO L402 AbstractCegarLoop]: === Iteration 50 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:02:22,077 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:02:22,077 INFO L85 PathProgramCache]: Analyzing trace with hash -1619738532, now seen corresponding path program 26 times [2021-11-03 05:02:22,077 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:02:22,078 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [854216820] [2021-11-03 05:02:22,078 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:02:22,078 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:02:22,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:02:22,271 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 78 proven. 43 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:02:22,271 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:02:22,271 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [854216820] [2021-11-03 05:02:22,271 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [854216820] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 05:02:22,271 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [699282580] [2021-11-03 05:02:22,271 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-03 05:02:22,271 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:02:22,271 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 05:02:22,273 INFO L229 MonitoredProcess]: Starting monitored process 50 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 05:02:22,296 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Waiting until timeout for monitored process [2021-11-03 05:02:23,541 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2021-11-03 05:02:23,541 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 05:02:23,542 INFO L263 TraceCheckSpWp]: Trace formula consists of 171 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-03 05:02:23,543 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:02:23,975 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 100 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:02:23,975 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:02:24,106 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 100 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:02:24,106 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [699282580] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 05:02:24,106 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1427910676] [2021-11-03 05:02:24,107 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-03 05:02:24,107 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 05:02:24,107 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 05:02:24,107 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 05:02:24,107 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 05:02:24,114 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:02:24,114 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:02:24,115 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:02:24,115 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 05:02:24,115 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:02:24,116 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:02:24,116 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 05:02:24,117 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 111 [2021-11-03 05:02:24,120 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_55|], 10=[|v_#valid_56|]} [2021-11-03 05:02:24,125 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:02:24,125 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 [2021-11-03 05:02:24,125 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:02:24,126 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:02:24,126 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:02:24,126 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:02:24,126 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 05:02:24,126 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:24,128 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:02:24,130 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:02:24,131 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:02:24,131 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:02:24,135 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:02:24,135 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 [2021-11-03 05:02:24,136 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:02:24,137 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:02:24,137 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:02:24,137 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:02:24,137 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 05:02:24,138 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:24,139 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:02:24,139 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:02:24,140 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 05:02:24,140 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 05:02:24,140 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:108, output treesize:93 [2021-11-03 05:02:24,144 INFO L180 QuantifierPusher]: treesize reduction 16, result has 87.0 percent of original size [2021-11-03 05:02:24,146 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 102 [2021-11-03 05:02:24,148 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:24,154 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:24,160 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:24,176 INFO L180 QuantifierPusher]: treesize reduction 6, result has 97.7 percent of original size [2021-11-03 05:02:24,180 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 251 [2021-11-03 05:02:24,184 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:24,200 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:24,201 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:24,201 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:24,202 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:24,202 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:24,205 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:24,208 INFO L180 QuantifierPusher]: treesize reduction 24, result has 70.7 percent of original size [2021-11-03 05:02:24,209 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 49 [2021-11-03 05:02:24,212 INFO L180 QuantifierPusher]: treesize reduction 25, result has 71.9 percent of original size [2021-11-03 05:02:24,214 INFO L185 QuantifierPusher]: treesize reduction 5, result has 90.6 percent of original size 48 [2021-11-03 05:02:24,215 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:24,219 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:24,223 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:24,231 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:02:24,233 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 120 [2021-11-03 05:02:24,235 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:24,243 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:24,244 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:24,244 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:24,245 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:24,246 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:24,247 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:24,250 INFO L180 QuantifierPusher]: treesize reduction 24, result has 71.8 percent of original size [2021-11-03 05:02:24,251 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 52 [2021-11-03 05:02:24,256 INFO L180 QuantifierPusher]: treesize reduction 25, result has 78.6 percent of original size [2021-11-03 05:02:24,258 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 90 [2021-11-03 05:02:24,259 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:24,265 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:24,266 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:24,266 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:24,267 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:24,268 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:02:24,272 INFO L180 QuantifierPusher]: treesize reduction 24, result has 78.2 percent of original size [2021-11-03 05:02:24,274 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 80 [2021-11-03 05:02:24,280 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 05:02:24,915 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 05:02:24,915 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. WARNING: YOUR LOGFILE WAS TOO LONG, SOME LINES IN THE MIDDLE WERE REMOVED. [2021-11-03 05:04:37,710 INFO L93 Difference]: Finished difference Result 152 states and 167 transitions. [2021-11-03 05:04:37,710 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-11-03 05:04:37,710 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 54 states have (on average 2.0) internal successors, (108), 53 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) Word has length 52 [2021-11-03 05:04:37,710 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:04:37,711 INFO L225 Difference]: With dead ends: 152 [2021-11-03 05:04:37,711 INFO L226 Difference]: Without dead ends: 113 [2021-11-03 05:04:37,711 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 204 GetRequests, 120 SyntacticMatches, 0 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2548 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1159, Invalid=6151, Unknown=0, NotChecked=0, Total=7310 [2021-11-03 05:04:37,711 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2021-11-03 05:04:37,803 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 65. [2021-11-03 05:04:37,803 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 64 states have (on average 1.21875) internal successors, (78), 64 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) [2021-11-03 05:04:37,803 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 78 transitions. [2021-11-03 05:04:37,803 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 78 transitions. Word has length 52 [2021-11-03 05:04:37,803 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:04:37,803 INFO L470 AbstractCegarLoop]: Abstraction has 65 states and 78 transitions. [2021-11-03 05:04:37,803 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 54 states, 54 states have (on average 2.0) internal successors, (108), 53 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) [2021-11-03 05:04:37,804 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 78 transitions. [2021-11-03 05:04:37,804 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-11-03 05:04:37,804 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:04:37,804 INFO L513 BasicCegarLoop]: trace histogram [12, 11, 11, 10, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:04:37,832 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (78)] Forceful destruction successful, exit code 0 [2021-11-03 05:04:38,004 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 78 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2030 [2021-11-03 05:04:38,004 INFO L402 AbstractCegarLoop]: === Iteration 79 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:04:38,005 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:04:38,005 INFO L85 PathProgramCache]: Analyzing trace with hash -481284398, now seen corresponding path program 46 times [2021-11-03 05:04:38,005 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:04:38,005 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1592314751] [2021-11-03 05:04:38,005 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:04:38,005 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:04:38,027 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:04:38,288 INFO L134 CoverageAnalysis]: Checked inductivity of 243 backedges. 156 proven. 87 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:04:38,288 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:04:38,289 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1592314751] [2021-11-03 05:04:38,289 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1592314751] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 05:04:38,289 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [102617224] [2021-11-03 05:04:38,289 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-03 05:04:38,289 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:04:38,289 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 05:04:38,290 INFO L229 MonitoredProcess]: Starting monitored process 79 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 05:04:38,290 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (79)] Waiting until timeout for monitored process [2021-11-03 05:04:40,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:04:40,787 INFO L263 TraceCheckSpWp]: Trace formula consists of 216 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-03 05:04:40,788 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:04:41,569 INFO L134 CoverageAnalysis]: Checked inductivity of 243 backedges. 187 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:04:41,569 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:04:41,747 INFO L134 CoverageAnalysis]: Checked inductivity of 243 backedges. 187 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:04:41,747 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [102617224] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 05:04:41,747 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [73530697] [2021-11-03 05:04:41,748 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-03 05:04:41,748 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 05:04:41,748 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 05:04:41,749 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 05:04:41,749 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 05:04:41,751 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:04:41,751 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:04:41,752 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:04:41,752 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 05:04:41,752 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:04:41,752 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:04:41,753 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 05:04:41,753 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 111 [2021-11-03 05:04:41,754 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_84|], 10=[|v_#valid_85|]} [2021-11-03 05:04:41,758 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:04:41,759 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 [2021-11-03 05:04:41,759 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:04:41,759 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:04:41,760 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:04:41,760 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:04:41,760 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 05:04:41,760 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:04:41,762 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:04:41,764 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:04:41,765 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:04:41,765 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:04:41,768 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:04:41,772 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 [2021-11-03 05:04:41,773 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:04:41,774 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:04:41,777 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:04:41,777 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:04:41,777 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 05:04:41,777 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:04:41,779 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:04:41,779 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:04:41,780 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 05:04:41,780 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 05:04:41,780 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:108, output treesize:93 [2021-11-03 05:04:41,783 INFO L180 QuantifierPusher]: treesize reduction 16, result has 87.0 percent of original size [2021-11-03 05:04:41,784 INFO L185 QuantifierPusher]: treesize reduction 5, result has 94.8 percent of original size 91 [2021-11-03 05:04:41,786 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:04:41,790 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:04:41,794 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:04:41,803 INFO L180 QuantifierPusher]: treesize reduction 6, result has 97.7 percent of original size [2021-11-03 05:04:41,806 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 249 [2021-11-03 05:04:41,808 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:04:41,820 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:04:41,820 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:04:41,821 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:04:41,821 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:04:41,821 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:04:41,823 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:04:41,825 INFO L180 QuantifierPusher]: treesize reduction 24, result has 70.7 percent of original size [2021-11-03 05:04:41,826 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 49 [2021-11-03 05:04:41,828 INFO L180 QuantifierPusher]: treesize reduction 25, result has 71.9 percent of original size [2021-11-03 05:04:41,829 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 57 [2021-11-03 05:04:41,830 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:04:41,833 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:04:41,836 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:04:41,841 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:04:41,842 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 122 [2021-11-03 05:04:41,844 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:04:41,849 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:04:41,850 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:04:41,850 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:04:41,851 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:04:41,851 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:04:41,852 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:04:41,854 INFO L180 QuantifierPusher]: treesize reduction 24, result has 71.8 percent of original size [2021-11-03 05:04:41,855 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 52 [2021-11-03 05:04:41,858 INFO L180 QuantifierPusher]: treesize reduction 25, result has 78.6 percent of original size [2021-11-03 05:04:41,859 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 90 [2021-11-03 05:04:41,861 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:04:41,864 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:04:41,865 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:04:41,865 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:04:41,865 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:04:41,866 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:04:41,869 INFO L180 QuantifierPusher]: treesize reduction 24, result has 78.2 percent of original size [2021-11-03 05:04:41,870 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 80 [2021-11-03 05:04:41,874 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 05:04:42,569 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 05:04:42,569 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 05:04:42,569 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 52 [2021-11-03 05:04:42,569 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [771786461] [2021-11-03 05:04:42,569 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2021-11-03 05:04:42,569 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:04:42,570 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2021-11-03 05:04:42,570 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=546, Invalid=3114, Unknown=0, NotChecked=0, Total=3660 [2021-11-03 05:04:42,570 INFO L87 Difference]: Start difference. First operand 65 states and 78 transitions. Second operand has 53 states, 53 states have (on average 2.0377358490566038) internal successors, (108), 52 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) [2021-11-03 05:04:43,503 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:04:43,503 INFO L93 Difference]: Finished difference Result 200 states and 216 transitions. [2021-11-03 05:04:43,503 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-11-03 05:04:43,503 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 53 states have (on average 2.0377358490566038) internal successors, (108), 52 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) Word has length 52 [2021-11-03 05:04:43,503 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:04:43,504 INFO L225 Difference]: With dead ends: 200 [2021-11-03 05:04:43,504 INFO L226 Difference]: Without dead ends: 161 [2021-11-03 05:04:43,505 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 214 GetRequests, 121 SyntacticMatches, 0 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3099 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1360, Invalid=7570, Unknown=0, NotChecked=0, Total=8930 [2021-11-03 05:04:43,505 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 161 states. [2021-11-03 05:04:43,597 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 161 to 65. [2021-11-03 05:04:43,597 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 64 states have (on average 1.21875) internal successors, (78), 64 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) [2021-11-03 05:04:43,598 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 78 transitions. [2021-11-03 05:04:43,598 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 78 transitions. Word has length 52 [2021-11-03 05:04:43,598 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:04:43,598 INFO L470 AbstractCegarLoop]: Abstraction has 65 states and 78 transitions. [2021-11-03 05:04:43,599 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 53 states, 53 states have (on average 2.0377358490566038) internal successors, (108), 52 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) [2021-11-03 05:04:43,599 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 78 transitions. [2021-11-03 05:04:43,599 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-11-03 05:04:43,599 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:04:43,599 INFO L513 BasicCegarLoop]: trace histogram [12, 11, 11, 9, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:04:43,627 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (79)] Forceful destruction successful, exit code 0 [2021-11-03 05:04:43,799 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2058,79 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:04:43,800 INFO L402 AbstractCegarLoop]: === Iteration 80 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:04:43,800 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:04:43,800 INFO L85 PathProgramCache]: Analyzing trace with hash -1515845855, now seen corresponding path program 47 times [2021-11-03 05:04:43,800 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:04:43,800 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1132066991] [2021-11-03 05:04:43,800 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:04:43,800 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:04:43,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:04:44,082 INFO L134 CoverageAnalysis]: Checked inductivity of 235 backedges. 156 proven. 79 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:04:44,082 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:04:44,083 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1132066991] [2021-11-03 05:04:44,083 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1132066991] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 05:04:44,083 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [332901167] [2021-11-03 05:04:44,083 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-03 05:04:44,083 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:04:44,083 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 05:04:44,084 INFO L229 MonitoredProcess]: Starting monitored process 80 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 05:04:44,084 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (80)] Waiting until timeout for monitored process [2021-11-03 05:04:46,627 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2021-11-03 05:04:46,627 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 05:04:46,629 INFO L263 TraceCheckSpWp]: Trace formula consists of 216 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-03 05:04:46,630 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:04:47,413 INFO L134 CoverageAnalysis]: Checked inductivity of 235 backedges. 187 proven. 48 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:04:47,413 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:04:47,595 INFO L134 CoverageAnalysis]: Checked inductivity of 235 backedges. 187 proven. 48 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:04:47,595 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [332901167] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 05:04:47,595 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1047525514] [2021-11-03 05:04:47,596 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-03 05:04:47,596 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 05:04:47,596 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 05:04:47,596 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 05:04:47,596 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 05:04:47,598 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:04:47,598 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:04:47,598 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:04:47,599 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 05:04:47,599 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:04:47,599 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:04:47,599 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 05:04:47,600 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 111 [2021-11-03 05:04:47,602 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_85|], 10=[|v_#valid_86|]} [2021-11-03 05:04:47,606 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:04:47,607 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 [2021-11-03 05:04:47,607 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:04:47,607 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:04:47,608 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:04:47,608 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:04:47,608 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 05:04:47,608 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:04:47,609 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:04:47,612 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:04:47,612 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:04:47,613 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:04:47,616 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:04:47,616 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 [2021-11-03 05:04:47,617 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:04:47,618 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:04:47,618 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:04:47,618 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:04:47,618 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 05:04:47,618 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:04:47,620 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:04:47,620 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:04:47,621 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 05:04:47,621 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 05:04:47,621 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:108, output treesize:93 [2021-11-03 05:04:47,624 INFO L180 QuantifierPusher]: treesize reduction 16, result has 87.0 percent of original size [2021-11-03 05:04:47,626 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 102 [2021-11-03 05:04:47,627 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:04:47,631 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:04:47,635 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:04:47,644 INFO L180 QuantifierPusher]: treesize reduction 6, result has 97.7 percent of original size [2021-11-03 05:04:47,647 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 251 [2021-11-03 05:04:47,649 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:04:47,660 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:04:47,660 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:04:47,661 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:04:47,661 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:04:47,661 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:04:47,663 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:04:47,664 INFO L180 QuantifierPusher]: treesize reduction 24, result has 70.7 percent of original size [2021-11-03 05:04:47,665 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 49 [2021-11-03 05:04:47,668 INFO L180 QuantifierPusher]: treesize reduction 25, result has 71.9 percent of original size [2021-11-03 05:04:47,669 INFO L185 QuantifierPusher]: treesize reduction 5, result has 90.6 percent of original size 48 [2021-11-03 05:04:47,670 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:04:47,673 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:04:47,675 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:04:47,680 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:04:47,682 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 120 [2021-11-03 05:04:47,683 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:04:47,689 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:04:47,689 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:04:47,690 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:04:47,690 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:04:47,690 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:04:47,691 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:04:47,693 INFO L180 QuantifierPusher]: treesize reduction 24, result has 71.8 percent of original size [2021-11-03 05:04:47,694 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 52 [2021-11-03 05:04:47,697 INFO L180 QuantifierPusher]: treesize reduction 25, result has 78.6 percent of original size [2021-11-03 05:04:47,699 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 90 [2021-11-03 05:04:47,700 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:04:47,704 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:04:47,704 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:04:47,705 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:04:47,705 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:04:47,706 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:04:47,708 INFO L180 QuantifierPusher]: treesize reduction 24, result has 78.2 percent of original size [2021-11-03 05:04:47,710 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 80 [2021-11-03 05:04:47,713 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 05:04:48,404 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 05:04:48,404 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 05:04:48,404 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 51 [2021-11-03 05:04:48,405 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [436521664] [2021-11-03 05:04:48,405 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2021-11-03 05:04:48,405 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:04:48,405 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2021-11-03 05:04:48,405 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=516, Invalid=3024, Unknown=0, NotChecked=0, Total=3540 [2021-11-03 05:04:48,406 INFO L87 Difference]: Start difference. First operand 65 states and 78 transitions. Second operand has 52 states, 52 states have (on average 2.0576923076923075) internal successors, (107), 51 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) [2021-11-03 05:04:49,629 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:04:49,629 INFO L93 Difference]: Finished difference Result 247 states and 264 transitions. [2021-11-03 05:04:49,629 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-11-03 05:04:49,629 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 52 states have (on average 2.0576923076923075) internal successors, (107), 51 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 52 [2021-11-03 05:04:49,629 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:04:49,630 INFO L225 Difference]: With dead ends: 247 [2021-11-03 05:04:49,630 INFO L226 Difference]: Without dead ends: 208 [2021-11-03 05:04:49,631 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 222 GetRequests, 122 SyntacticMatches, 0 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3574 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=1563, Invalid=8739, Unknown=0, NotChecked=0, Total=10302 [2021-11-03 05:04:49,631 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 208 states. [2021-11-03 05:04:49,737 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 208 to 65. [2021-11-03 05:04:49,738 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 64 states have (on average 1.21875) internal successors, (78), 64 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) [2021-11-03 05:04:49,738 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 78 transitions. [2021-11-03 05:04:49,738 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 78 transitions. Word has length 52 [2021-11-03 05:04:49,738 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:04:49,738 INFO L470 AbstractCegarLoop]: Abstraction has 65 states and 78 transitions. [2021-11-03 05:04:49,738 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 52 states, 52 states have (on average 2.0576923076923075) internal successors, (107), 51 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) [2021-11-03 05:04:49,738 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 78 transitions. [2021-11-03 05:04:49,739 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-11-03 05:04:49,739 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:04:49,739 INFO L513 BasicCegarLoop]: trace histogram [12, 11, 11, 8, 3, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:04:49,767 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (80)] Ended with exit code 0 [2021-11-03 05:04:49,939 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2087,80 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:04:49,939 INFO L402 AbstractCegarLoop]: === Iteration 81 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:04:49,939 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:04:49,940 INFO L85 PathProgramCache]: Analyzing trace with hash 1914464498, now seen corresponding path program 48 times [2021-11-03 05:04:49,940 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:04:49,940 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [223799870] [2021-11-03 05:04:49,940 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:04:49,940 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:04:49,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:04:50,217 INFO L134 CoverageAnalysis]: Checked inductivity of 229 backedges. 156 proven. 73 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:04:50,217 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:04:50,217 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [223799870] [2021-11-03 05:04:50,217 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [223799870] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 05:04:50,218 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [483682243] [2021-11-03 05:04:50,218 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-03 05:04:50,218 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:04:50,218 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 05:04:50,218 INFO L229 MonitoredProcess]: Starting monitored process 81 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 05:04:50,219 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (81)] Waiting until timeout for monitored process [2021-11-03 05:04:52,817 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-03 05:04:52,817 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 05:04:52,819 INFO L263 TraceCheckSpWp]: Trace formula consists of 216 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-03 05:04:52,819 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:04:53,561 INFO L134 CoverageAnalysis]: Checked inductivity of 229 backedges. 187 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:04:53,561 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:04:53,718 INFO L134 CoverageAnalysis]: Checked inductivity of 229 backedges. 187 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:04:53,719 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [483682243] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 05:04:53,719 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1096738357] [2021-11-03 05:04:53,719 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-03 05:04:53,719 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 05:04:53,720 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 05:04:53,720 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 05:04:53,720 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 05:04:53,721 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:04:53,722 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:04:53,722 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:04:53,722 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 05:04:53,722 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:04:53,723 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:04:53,723 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 05:04:53,724 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 111 [2021-11-03 05:04:53,725 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_86|], 10=[|v_#valid_87|]} [2021-11-03 05:04:53,729 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:04:53,729 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 [2021-11-03 05:04:53,730 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:04:53,730 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:04:53,730 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:04:53,730 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:04:53,731 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 05:04:53,731 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:04:53,732 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:04:53,734 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:04:53,735 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:04:53,736 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:04:53,738 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:04:53,739 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 [2021-11-03 05:04:53,739 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:04:53,740 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:04:53,740 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:04:53,741 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:04:53,741 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 05:04:53,741 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:04:53,742 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:04:53,743 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:04:53,744 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 05:04:53,744 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 05:04:53,744 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:108, output treesize:93 [2021-11-03 05:04:53,747 INFO L180 QuantifierPusher]: treesize reduction 16, result has 87.0 percent of original size [2021-11-03 05:04:53,748 INFO L185 QuantifierPusher]: treesize reduction 5, result has 94.8 percent of original size 91 [2021-11-03 05:04:53,750 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:04:53,753 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:04:53,757 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:04:53,767 INFO L180 QuantifierPusher]: treesize reduction 6, result has 97.7 percent of original size [2021-11-03 05:04:53,769 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 249 [2021-11-03 05:04:53,772 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:04:53,784 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:04:53,784 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:04:53,785 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:04:53,785 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:04:53,785 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:04:53,786 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:04:53,788 INFO L180 QuantifierPusher]: treesize reduction 24, result has 70.7 percent of original size [2021-11-03 05:04:53,789 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 49 [2021-11-03 05:04:53,792 INFO L180 QuantifierPusher]: treesize reduction 25, result has 71.9 percent of original size [2021-11-03 05:04:53,793 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 57 [2021-11-03 05:04:53,794 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:04:53,796 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:04:53,799 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:04:53,804 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:04:53,806 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 122 [2021-11-03 05:04:53,807 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:04:53,813 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:04:53,813 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:04:53,814 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:04:53,814 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:04:53,814 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:04:53,815 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:04:53,818 INFO L180 QuantifierPusher]: treesize reduction 24, result has 71.8 percent of original size [2021-11-03 05:04:53,818 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 52 [2021-11-03 05:04:53,822 INFO L180 QuantifierPusher]: treesize reduction 25, result has 78.6 percent of original size [2021-11-03 05:04:53,823 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 87 [2021-11-03 05:04:53,824 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:04:53,828 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:04:53,828 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:04:53,829 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:04:53,829 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:04:53,830 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:04:53,833 INFO L180 QuantifierPusher]: treesize reduction 24, result has 78.2 percent of original size [2021-11-03 05:04:53,834 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 80 [2021-11-03 05:04:53,837 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 05:04:54,527 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 05:04:54,527 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 05:04:54,527 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 50 [2021-11-03 05:04:54,528 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [659942956] [2021-11-03 05:04:54,528 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2021-11-03 05:04:54,528 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:04:54,528 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2021-11-03 05:04:54,528 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=490, Invalid=2932, Unknown=0, NotChecked=0, Total=3422 [2021-11-03 05:04:54,529 INFO L87 Difference]: Start difference. First operand 65 states and 78 transitions. Second operand has 51 states, 51 states have (on average 2.0784313725490198) internal successors, (106), 50 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) [2021-11-03 05:04:55,927 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:04:55,928 INFO L93 Difference]: Finished difference Result 293 states and 311 transitions. [2021-11-03 05:04:55,928 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2021-11-03 05:04:55,928 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 2.0784313725490198) internal successors, (106), 50 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 52 [2021-11-03 05:04:55,928 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:04:55,929 INFO L225 Difference]: With dead ends: 293 [2021-11-03 05:04:55,929 INFO L226 Difference]: Without dead ends: 254 [2021-11-03 05:04:55,931 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 228 GetRequests, 123 SyntacticMatches, 0 SemanticMatches, 105 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3932 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=1723, Invalid=9619, Unknown=0, NotChecked=0, Total=11342 [2021-11-03 05:04:55,931 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 254 states. [2021-11-03 05:04:56,083 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 254 to 65. [2021-11-03 05:04:56,083 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 64 states have (on average 1.21875) internal successors, (78), 64 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) [2021-11-03 05:04:56,084 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 78 transitions. [2021-11-03 05:04:56,084 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 78 transitions. Word has length 52 [2021-11-03 05:04:56,084 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:04:56,084 INFO L470 AbstractCegarLoop]: Abstraction has 65 states and 78 transitions. [2021-11-03 05:04:56,084 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 51 states have (on average 2.0784313725490198) internal successors, (106), 50 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) [2021-11-03 05:04:56,084 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 78 transitions. [2021-11-03 05:04:56,084 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-11-03 05:04:56,084 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:04:56,084 INFO L513 BasicCegarLoop]: trace histogram [12, 11, 11, 7, 4, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:04:56,113 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (81)] Forceful destruction successful, exit code 0 [2021-11-03 05:04:56,285 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 81 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2116 [2021-11-03 05:04:56,285 INFO L402 AbstractCegarLoop]: === Iteration 82 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:04:56,285 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:04:56,285 INFO L85 PathProgramCache]: Analyzing trace with hash 224004353, now seen corresponding path program 49 times [2021-11-03 05:04:56,285 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:04:56,285 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [254055793] [2021-11-03 05:04:56,285 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:04:56,285 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:04:56,308 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:04:56,593 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 156 proven. 69 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:04:56,593 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:04:56,593 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [254055793] [2021-11-03 05:04:56,593 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [254055793] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 05:04:56,593 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1046859171] [2021-11-03 05:04:56,593 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-03 05:04:56,594 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:04:56,594 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 05:04:56,595 INFO L229 MonitoredProcess]: Starting monitored process 82 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 05:04:56,615 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (82)] Waiting until timeout for monitored process [2021-11-03 05:04:59,283 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:04:59,285 INFO L263 TraceCheckSpWp]: Trace formula consists of 216 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-03 05:04:59,285 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:04:59,961 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 187 proven. 38 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:04:59,961 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:05:00,117 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 187 proven. 38 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:05:00,117 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1046859171] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 05:05:00,117 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [636343229] [2021-11-03 05:05:00,118 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-03 05:05:00,118 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 05:05:00,118 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 05:05:00,118 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 05:05:00,118 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 05:05:00,120 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:05:00,120 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:05:00,121 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:05:00,121 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 05:05:00,121 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:05:00,121 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:05:00,122 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 05:05:00,122 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 111 [2021-11-03 05:05:00,124 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_87|], 10=[|v_#valid_88|]} [2021-11-03 05:05:00,128 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:05:00,129 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 [2021-11-03 05:05:00,129 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:05:00,129 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:05:00,129 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:05:00,130 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:05:00,130 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 05:05:00,130 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:00,131 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:05:00,134 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:05:00,134 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:05:00,135 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:05:00,137 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:05:00,138 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2021-11-03 05:05:00,138 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:05:00,139 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:05:00,140 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:05:00,140 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:05:00,140 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 05:05:00,140 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:00,142 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:05:00,142 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:05:00,143 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 05:05:00,143 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 05:05:00,143 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:108, output treesize:93 [2021-11-03 05:05:00,146 INFO L180 QuantifierPusher]: treesize reduction 16, result has 87.0 percent of original size [2021-11-03 05:05:00,147 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 100 [2021-11-03 05:05:00,149 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:00,153 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:00,156 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:00,165 INFO L180 QuantifierPusher]: treesize reduction 11, result has 95.8 percent of original size [2021-11-03 05:05:00,168 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 251 [2021-11-03 05:05:00,171 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:00,181 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:00,182 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:00,182 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:00,183 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:00,183 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:00,184 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:00,186 INFO L180 QuantifierPusher]: treesize reduction 24, result has 70.7 percent of original size [2021-11-03 05:05:00,187 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 49 [2021-11-03 05:05:00,189 INFO L180 QuantifierPusher]: treesize reduction 25, result has 71.9 percent of original size [2021-11-03 05:05:00,190 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 57 [2021-11-03 05:05:00,192 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:00,194 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:00,197 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:00,202 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:05:00,203 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 122 [2021-11-03 05:05:00,205 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:00,210 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:00,211 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:00,211 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:00,212 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:00,212 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:00,213 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:00,215 INFO L180 QuantifierPusher]: treesize reduction 24, result has 71.8 percent of original size [2021-11-03 05:05:00,216 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 52 [2021-11-03 05:05:00,219 INFO L180 QuantifierPusher]: treesize reduction 25, result has 78.6 percent of original size [2021-11-03 05:05:00,220 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 90 [2021-11-03 05:05:00,222 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:00,225 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:00,226 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:00,226 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:00,227 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:00,228 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:00,230 INFO L180 QuantifierPusher]: treesize reduction 24, result has 78.2 percent of original size [2021-11-03 05:05:00,231 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 80 [2021-11-03 05:05:00,235 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 05:05:00,922 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 05:05:00,922 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 05:05:00,922 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 49 [2021-11-03 05:05:00,923 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1108294907] [2021-11-03 05:05:00,923 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2021-11-03 05:05:00,923 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:05:00,923 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-11-03 05:05:00,923 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=468, Invalid=2838, Unknown=0, NotChecked=0, Total=3306 [2021-11-03 05:05:00,923 INFO L87 Difference]: Start difference. First operand 65 states and 78 transitions. Second operand has 50 states, 50 states have (on average 2.1) internal successors, (105), 49 states have internal predecessors, (105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:05:02,485 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:05:02,486 INFO L93 Difference]: Finished difference Result 338 states and 357 transitions. [2021-11-03 05:05:02,486 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2021-11-03 05:05:02,486 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 2.1) internal successors, (105), 49 states have internal predecessors, (105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 52 [2021-11-03 05:05:02,486 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:05:02,487 INFO L225 Difference]: With dead ends: 338 [2021-11-03 05:05:02,487 INFO L226 Difference]: Without dead ends: 299 [2021-11-03 05:05:02,488 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 232 GetRequests, 124 SyntacticMatches, 0 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4152 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=1825, Invalid=10165, Unknown=0, NotChecked=0, Total=11990 [2021-11-03 05:05:02,488 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 299 states. [2021-11-03 05:05:02,587 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 299 to 65. [2021-11-03 05:05:02,588 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 64 states have (on average 1.21875) internal successors, (78), 64 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) [2021-11-03 05:05:02,588 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 78 transitions. [2021-11-03 05:05:02,588 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 78 transitions. Word has length 52 [2021-11-03 05:05:02,588 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:05:02,588 INFO L470 AbstractCegarLoop]: Abstraction has 65 states and 78 transitions. [2021-11-03 05:05:02,588 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 50 states have (on average 2.1) internal successors, (105), 49 states have internal predecessors, (105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:05:02,588 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 78 transitions. [2021-11-03 05:05:02,589 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-11-03 05:05:02,589 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:05:02,589 INFO L513 BasicCegarLoop]: trace histogram [12, 11, 11, 6, 5, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:05:02,617 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (82)] Forceful destruction successful, exit code 0 [2021-11-03 05:05:02,789 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 82 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2145 [2021-11-03 05:05:02,789 INFO L402 AbstractCegarLoop]: === Iteration 83 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:05:02,789 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:05:02,790 INFO L85 PathProgramCache]: Analyzing trace with hash 1693494034, now seen corresponding path program 50 times [2021-11-03 05:05:02,790 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:05:02,790 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [178281836] [2021-11-03 05:05:02,790 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:05:02,790 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:05:02,813 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:05:03,045 INFO L134 CoverageAnalysis]: Checked inductivity of 223 backedges. 156 proven. 67 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:05:03,045 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:05:03,045 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [178281836] [2021-11-03 05:05:03,045 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [178281836] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 05:05:03,045 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1190018013] [2021-11-03 05:05:03,045 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-03 05:05:03,045 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:05:03,045 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 05:05:03,046 INFO L229 MonitoredProcess]: Starting monitored process 83 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 05:05:03,047 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (83)] Waiting until timeout for monitored process [2021-11-03 05:05:05,754 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2021-11-03 05:05:05,754 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 05:05:05,755 INFO L263 TraceCheckSpWp]: Trace formula consists of 216 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-03 05:05:05,756 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:05:06,420 INFO L134 CoverageAnalysis]: Checked inductivity of 223 backedges. 187 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:05:06,420 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:05:06,577 INFO L134 CoverageAnalysis]: Checked inductivity of 223 backedges. 187 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:05:06,577 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1190018013] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 05:05:06,577 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1115340403] [2021-11-03 05:05:06,578 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-03 05:05:06,578 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 05:05:06,578 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 05:05:06,578 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 05:05:06,578 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 05:05:06,580 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:05:06,580 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:05:06,580 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:05:06,581 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 05:05:06,581 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:05:06,581 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:05:06,581 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 05:05:06,582 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 111 [2021-11-03 05:05:06,583 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_88|], 10=[|v_#valid_89|]} [2021-11-03 05:05:06,587 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:05:06,588 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 [2021-11-03 05:05:06,588 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:05:06,588 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:05:06,588 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:05:06,589 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:05:06,589 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 05:05:06,589 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:06,590 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:05:06,593 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:05:06,593 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:05:06,594 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:05:06,596 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:05:06,597 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 [2021-11-03 05:05:06,597 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:05:06,598 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:05:06,599 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:05:06,599 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:05:06,599 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 05:05:06,599 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:06,601 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:05:06,601 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:05:06,602 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 05:05:06,602 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 05:05:06,602 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:108, output treesize:93 [2021-11-03 05:05:06,605 INFO L180 QuantifierPusher]: treesize reduction 16, result has 87.0 percent of original size [2021-11-03 05:05:06,607 INFO L185 QuantifierPusher]: treesize reduction 7, result has 92.9 percent of original size 91 [2021-11-03 05:05:06,608 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:06,612 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:06,616 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:06,625 INFO L180 QuantifierPusher]: treesize reduction 6, result has 97.7 percent of original size [2021-11-03 05:05:06,627 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 249 [2021-11-03 05:05:06,630 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:06,641 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:06,642 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:06,642 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:06,643 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:06,643 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:06,644 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:06,646 INFO L180 QuantifierPusher]: treesize reduction 24, result has 70.7 percent of original size [2021-11-03 05:05:06,647 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 49 [2021-11-03 05:05:06,650 INFO L180 QuantifierPusher]: treesize reduction 25, result has 71.9 percent of original size [2021-11-03 05:05:06,651 INFO L185 QuantifierPusher]: treesize reduction 5, result has 90.6 percent of original size 48 [2021-11-03 05:05:06,652 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:06,654 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:06,657 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:06,662 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:05:06,664 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 120 [2021-11-03 05:05:06,665 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:06,671 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:06,671 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:06,672 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:06,672 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:06,672 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:06,673 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:06,675 INFO L180 QuantifierPusher]: treesize reduction 24, result has 71.8 percent of original size [2021-11-03 05:05:06,676 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 52 [2021-11-03 05:05:06,679 INFO L180 QuantifierPusher]: treesize reduction 25, result has 78.6 percent of original size [2021-11-03 05:05:06,681 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 90 [2021-11-03 05:05:06,682 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:06,686 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:06,686 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:06,687 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:06,687 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:06,688 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:06,690 INFO L180 QuantifierPusher]: treesize reduction 24, result has 78.2 percent of original size [2021-11-03 05:05:06,692 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 80 [2021-11-03 05:05:06,695 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 05:05:07,433 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 05:05:07,433 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 05:05:07,433 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 48 [2021-11-03 05:05:07,433 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1899909599] [2021-11-03 05:05:07,433 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2021-11-03 05:05:07,433 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:05:07,434 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-11-03 05:05:07,434 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=450, Invalid=2742, Unknown=0, NotChecked=0, Total=3192 [2021-11-03 05:05:07,434 INFO L87 Difference]: Start difference. First operand 65 states and 78 transitions. Second operand has 49 states, 49 states have (on average 2.122448979591837) internal successors, (104), 48 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) [2021-11-03 05:05:09,046 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:05:09,047 INFO L93 Difference]: Finished difference Result 382 states and 402 transitions. [2021-11-03 05:05:09,047 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2021-11-03 05:05:09,047 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 2.122448979591837) internal successors, (104), 48 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) Word has length 52 [2021-11-03 05:05:09,047 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:05:09,048 INFO L225 Difference]: With dead ends: 382 [2021-11-03 05:05:09,048 INFO L226 Difference]: Without dead ends: 343 [2021-11-03 05:05:09,049 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 234 GetRequests, 125 SyntacticMatches, 0 SemanticMatches, 109 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4213 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=1860, Invalid=10350, Unknown=0, NotChecked=0, Total=12210 [2021-11-03 05:05:09,050 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 343 states. [2021-11-03 05:05:09,205 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 343 to 65. [2021-11-03 05:05:09,205 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 64 states have (on average 1.21875) internal successors, (78), 64 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) [2021-11-03 05:05:09,205 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 78 transitions. [2021-11-03 05:05:09,206 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 78 transitions. Word has length 52 [2021-11-03 05:05:09,206 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:05:09,206 INFO L470 AbstractCegarLoop]: Abstraction has 65 states and 78 transitions. [2021-11-03 05:05:09,206 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 49 states have (on average 2.122448979591837) internal successors, (104), 48 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) [2021-11-03 05:05:09,206 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 78 transitions. [2021-11-03 05:05:09,206 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-11-03 05:05:09,206 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:05:09,206 INFO L513 BasicCegarLoop]: trace histogram [12, 11, 11, 6, 5, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:05:09,235 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (83)] Ended with exit code 0 [2021-11-03 05:05:09,406 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2174,83 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:05:09,407 INFO L402 AbstractCegarLoop]: === Iteration 84 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:05:09,407 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:05:09,407 INFO L85 PathProgramCache]: Analyzing trace with hash -337313055, now seen corresponding path program 51 times [2021-11-03 05:05:09,407 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:05:09,407 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [452787826] [2021-11-03 05:05:09,407 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:05:09,407 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:05:09,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:05:09,664 INFO L134 CoverageAnalysis]: Checked inductivity of 223 backedges. 156 proven. 67 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:05:09,664 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:05:09,664 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [452787826] [2021-11-03 05:05:09,664 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [452787826] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 05:05:09,664 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2061369940] [2021-11-03 05:05:09,664 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-03 05:05:09,664 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:05:09,665 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 05:05:09,665 INFO L229 MonitoredProcess]: Starting monitored process 84 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 05:05:09,666 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (84)] Waiting until timeout for monitored process [2021-11-03 05:05:12,422 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-03 05:05:12,422 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 05:05:12,424 INFO L263 TraceCheckSpWp]: Trace formula consists of 216 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-03 05:05:12,424 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:05:13,079 INFO L134 CoverageAnalysis]: Checked inductivity of 223 backedges. 187 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:05:13,079 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:05:13,237 INFO L134 CoverageAnalysis]: Checked inductivity of 223 backedges. 187 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:05:13,237 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2061369940] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 05:05:13,237 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [978673079] [2021-11-03 05:05:13,238 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-03 05:05:13,238 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 05:05:13,238 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 05:05:13,238 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 05:05:13,238 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 05:05:13,240 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:05:13,240 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:05:13,240 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:05:13,240 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 05:05:13,241 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:05:13,241 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:05:13,241 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 05:05:13,242 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 111 [2021-11-03 05:05:13,243 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_89|], 10=[|v_#valid_90|]} [2021-11-03 05:05:13,247 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:05:13,248 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 [2021-11-03 05:05:13,248 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:05:13,248 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:05:13,249 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:05:13,249 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:05:13,249 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 05:05:13,249 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:13,261 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:05:13,264 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:05:13,265 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:05:13,266 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:05:13,269 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:05:13,270 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 [2021-11-03 05:05:13,270 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:05:13,273 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:05:13,273 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:05:13,274 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:05:13,274 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 05:05:13,274 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:13,276 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:05:13,277 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:05:13,278 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 05:05:13,278 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 05:05:13,278 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:108, output treesize:93 [2021-11-03 05:05:13,281 INFO L180 QuantifierPusher]: treesize reduction 16, result has 87.0 percent of original size [2021-11-03 05:05:13,282 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 102 [2021-11-03 05:05:13,284 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:13,288 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:13,292 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:13,301 INFO L180 QuantifierPusher]: treesize reduction 6, result has 97.7 percent of original size [2021-11-03 05:05:13,304 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 251 [2021-11-03 05:05:13,306 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:13,317 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:13,317 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:13,318 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:13,318 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:13,318 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:13,320 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:13,322 INFO L180 QuantifierPusher]: treesize reduction 24, result has 70.7 percent of original size [2021-11-03 05:05:13,323 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 49 [2021-11-03 05:05:13,325 INFO L180 QuantifierPusher]: treesize reduction 25, result has 71.9 percent of original size [2021-11-03 05:05:13,326 INFO L185 QuantifierPusher]: treesize reduction 5, result has 90.6 percent of original size 48 [2021-11-03 05:05:13,327 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:13,330 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:13,333 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:13,338 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:05:13,339 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 120 [2021-11-03 05:05:13,341 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:13,346 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:13,347 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:13,347 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:13,347 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:13,348 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:13,349 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:13,351 INFO L180 QuantifierPusher]: treesize reduction 24, result has 71.8 percent of original size [2021-11-03 05:05:13,352 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 52 [2021-11-03 05:05:13,355 INFO L180 QuantifierPusher]: treesize reduction 25, result has 78.6 percent of original size [2021-11-03 05:05:13,356 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 87 [2021-11-03 05:05:13,358 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:13,361 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:13,362 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:13,362 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:13,363 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:13,364 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:13,366 INFO L180 QuantifierPusher]: treesize reduction 24, result has 78.2 percent of original size [2021-11-03 05:05:13,368 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 80 [2021-11-03 05:05:13,371 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 05:05:14,055 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 05:05:14,055 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 05:05:14,055 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 47 [2021-11-03 05:05:14,055 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1869662798] [2021-11-03 05:05:14,056 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2021-11-03 05:05:14,056 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:05:14,056 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-11-03 05:05:14,056 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=436, Invalid=2644, Unknown=0, NotChecked=0, Total=3080 [2021-11-03 05:05:14,056 INFO L87 Difference]: Start difference. First operand 65 states and 78 transitions. Second operand has 48 states, 48 states have (on average 2.1458333333333335) internal successors, (103), 47 states have internal predecessors, (103), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:05:15,818 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:05:15,818 INFO L93 Difference]: Finished difference Result 425 states and 446 transitions. [2021-11-03 05:05:15,818 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2021-11-03 05:05:15,818 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 2.1458333333333335) internal successors, (103), 47 states have internal predecessors, (103), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 52 [2021-11-03 05:05:15,818 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:05:15,820 INFO L225 Difference]: With dead ends: 425 [2021-11-03 05:05:15,820 INFO L226 Difference]: Without dead ends: 386 [2021-11-03 05:05:15,821 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 234 GetRequests, 126 SyntacticMatches, 0 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4106 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=1825, Invalid=10165, Unknown=0, NotChecked=0, Total=11990 [2021-11-03 05:05:15,822 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 386 states. [2021-11-03 05:05:15,981 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 386 to 65. [2021-11-03 05:05:15,981 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 64 states have (on average 1.21875) internal successors, (78), 64 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) [2021-11-03 05:05:15,982 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 78 transitions. [2021-11-03 05:05:15,982 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 78 transitions. Word has length 52 [2021-11-03 05:05:15,982 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:05:15,982 INFO L470 AbstractCegarLoop]: Abstraction has 65 states and 78 transitions. [2021-11-03 05:05:15,982 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 48 states have (on average 2.1458333333333335) internal successors, (103), 47 states have internal predecessors, (103), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:05:15,982 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 78 transitions. [2021-11-03 05:05:15,982 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-11-03 05:05:15,982 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:05:15,982 INFO L513 BasicCegarLoop]: trace histogram [12, 11, 11, 7, 4, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:05:16,011 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (84)] Ended with exit code 0 [2021-11-03 05:05:16,183 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 84 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2203 [2021-11-03 05:05:16,183 INFO L402 AbstractCegarLoop]: === Iteration 85 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:05:16,183 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:05:16,183 INFO L85 PathProgramCache]: Analyzing trace with hash -1372654286, now seen corresponding path program 52 times [2021-11-03 05:05:16,184 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:05:16,184 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [700044663] [2021-11-03 05:05:16,184 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:05:16,184 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:05:16,207 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:05:16,436 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 156 proven. 69 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:05:16,436 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:05:16,436 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [700044663] [2021-11-03 05:05:16,436 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [700044663] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 05:05:16,437 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1136791465] [2021-11-03 05:05:16,437 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-03 05:05:16,437 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:05:16,437 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 05:05:16,438 INFO L229 MonitoredProcess]: Starting monitored process 85 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 05:05:16,439 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (85)] Waiting until timeout for monitored process [2021-11-03 05:05:19,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:05:19,222 INFO L263 TraceCheckSpWp]: Trace formula consists of 216 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-03 05:05:19,223 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:05:19,850 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 187 proven. 38 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:05:19,850 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:05:20,006 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 187 proven. 38 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:05:20,007 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1136791465] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 05:05:20,007 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [888797034] [2021-11-03 05:05:20,007 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-03 05:05:20,007 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 05:05:20,007 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 05:05:20,008 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 05:05:20,008 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 05:05:20,011 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:05:20,011 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:05:20,011 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:05:20,012 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 05:05:20,012 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:05:20,012 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:05:20,012 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 05:05:20,013 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 111 [2021-11-03 05:05:20,014 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_90|], 10=[|v_#valid_91|]} [2021-11-03 05:05:20,018 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:05:20,019 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 [2021-11-03 05:05:20,019 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:05:20,019 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:05:20,020 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:05:20,020 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:05:20,020 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 05:05:20,020 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:20,022 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:05:20,024 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:05:20,024 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:05:20,025 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:05:20,028 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:05:20,029 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 [2021-11-03 05:05:20,029 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:05:20,030 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:05:20,031 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:05:20,031 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:05:20,031 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 05:05:20,031 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:20,033 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:05:20,033 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:05:20,034 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 05:05:20,034 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 05:05:20,034 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:108, output treesize:93 [2021-11-03 05:05:20,037 INFO L180 QuantifierPusher]: treesize reduction 16, result has 87.0 percent of original size [2021-11-03 05:05:20,038 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 100 [2021-11-03 05:05:20,040 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:20,044 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:20,048 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:20,057 INFO L180 QuantifierPusher]: treesize reduction 11, result has 95.8 percent of original size [2021-11-03 05:05:20,059 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 251 [2021-11-03 05:05:20,062 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:20,073 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:20,073 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:20,073 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:20,074 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:20,074 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:20,075 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:20,077 INFO L180 QuantifierPusher]: treesize reduction 24, result has 70.7 percent of original size [2021-11-03 05:05:20,078 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 49 [2021-11-03 05:05:20,081 INFO L180 QuantifierPusher]: treesize reduction 25, result has 71.9 percent of original size [2021-11-03 05:05:20,082 INFO L185 QuantifierPusher]: treesize reduction 5, result has 90.6 percent of original size 48 [2021-11-03 05:05:20,083 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:20,086 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:20,089 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:20,093 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:05:20,095 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 120 [2021-11-03 05:05:20,097 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:20,102 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:20,103 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:20,103 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:20,103 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:20,104 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:20,105 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:20,107 INFO L180 QuantifierPusher]: treesize reduction 24, result has 71.8 percent of original size [2021-11-03 05:05:20,108 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 52 [2021-11-03 05:05:20,112 INFO L180 QuantifierPusher]: treesize reduction 25, result has 78.6 percent of original size [2021-11-03 05:05:20,113 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 87 [2021-11-03 05:05:20,114 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:20,118 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:20,118 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:20,119 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:20,119 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:20,120 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:20,123 INFO L180 QuantifierPusher]: treesize reduction 24, result has 78.2 percent of original size [2021-11-03 05:05:20,124 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 80 [2021-11-03 05:05:20,128 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 05:05:20,813 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 05:05:20,814 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 05:05:20,814 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 46 [2021-11-03 05:05:20,814 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [733313416] [2021-11-03 05:05:20,814 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 47 states [2021-11-03 05:05:20,814 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:05:20,814 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2021-11-03 05:05:20,815 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=426, Invalid=2544, Unknown=0, NotChecked=0, Total=2970 [2021-11-03 05:05:20,815 INFO L87 Difference]: Start difference. First operand 65 states and 78 transitions. Second operand has 47 states, 47 states have (on average 2.1702127659574466) internal successors, (102), 46 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) [2021-11-03 05:05:22,621 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:05:22,621 INFO L93 Difference]: Finished difference Result 467 states and 489 transitions. [2021-11-03 05:05:22,621 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2021-11-03 05:05:22,621 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 2.1702127659574466) internal successors, (102), 46 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 52 [2021-11-03 05:05:22,622 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:05:22,623 INFO L225 Difference]: With dead ends: 467 [2021-11-03 05:05:22,623 INFO L226 Difference]: Without dead ends: 428 [2021-11-03 05:05:22,624 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 232 GetRequests, 127 SyntacticMatches, 0 SemanticMatches, 105 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3834 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=1723, Invalid=9619, Unknown=0, NotChecked=0, Total=11342 [2021-11-03 05:05:22,624 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 428 states. [2021-11-03 05:05:22,730 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 428 to 65. [2021-11-03 05:05:22,731 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 64 states have (on average 1.21875) internal successors, (78), 64 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) [2021-11-03 05:05:22,731 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 78 transitions. [2021-11-03 05:05:22,731 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 78 transitions. Word has length 52 [2021-11-03 05:05:22,731 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:05:22,731 INFO L470 AbstractCegarLoop]: Abstraction has 65 states and 78 transitions. [2021-11-03 05:05:22,731 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 47 states, 47 states have (on average 2.1702127659574466) internal successors, (102), 46 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) [2021-11-03 05:05:22,731 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 78 transitions. [2021-11-03 05:05:22,732 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-11-03 05:05:22,732 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:05:22,732 INFO L513 BasicCegarLoop]: trace histogram [12, 11, 11, 8, 3, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:05:22,760 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (85)] Ended with exit code 0 [2021-11-03 05:05:22,937 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 85 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2232 [2021-11-03 05:05:22,937 INFO L402 AbstractCegarLoop]: === Iteration 86 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:05:22,937 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:05:22,938 INFO L85 PathProgramCache]: Analyzing trace with hash 2057630913, now seen corresponding path program 53 times [2021-11-03 05:05:22,938 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:05:22,938 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1217295481] [2021-11-03 05:05:22,938 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:05:22,938 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:05:22,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:05:23,243 INFO L134 CoverageAnalysis]: Checked inductivity of 229 backedges. 156 proven. 73 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:05:23,243 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:05:23,243 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1217295481] [2021-11-03 05:05:23,243 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1217295481] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 05:05:23,243 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [460240527] [2021-11-03 05:05:23,244 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-03 05:05:23,244 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:05:23,244 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 05:05:23,245 INFO L229 MonitoredProcess]: Starting monitored process 86 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 05:05:23,246 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (86)] Waiting until timeout for monitored process [2021-11-03 05:05:26,095 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2021-11-03 05:05:26,095 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 05:05:26,096 INFO L263 TraceCheckSpWp]: Trace formula consists of 216 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-03 05:05:26,097 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:05:26,710 INFO L134 CoverageAnalysis]: Checked inductivity of 229 backedges. 187 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:05:26,710 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:05:26,866 INFO L134 CoverageAnalysis]: Checked inductivity of 229 backedges. 187 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:05:26,866 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [460240527] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 05:05:26,867 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1673488112] [2021-11-03 05:05:26,867 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-03 05:05:26,868 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 05:05:26,868 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 05:05:26,868 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 05:05:26,868 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 05:05:26,870 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:05:26,870 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:05:26,870 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:05:26,871 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 05:05:26,871 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:05:26,871 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:05:26,871 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 05:05:26,872 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 111 [2021-11-03 05:05:26,875 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_91|], 10=[|v_#valid_92|]} [2021-11-03 05:05:26,882 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:05:26,882 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 [2021-11-03 05:05:26,882 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:05:26,883 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:05:26,883 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:05:26,883 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:05:26,883 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 05:05:26,884 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:26,885 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:05:26,887 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:05:26,888 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:05:26,889 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:05:26,891 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:05:26,892 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 [2021-11-03 05:05:26,892 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:05:26,893 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:05:26,893 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:05:26,894 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:05:26,894 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 05:05:26,894 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:26,895 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:05:26,896 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:05:26,896 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 05:05:26,897 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 05:05:26,897 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:108, output treesize:93 [2021-11-03 05:05:26,900 INFO L180 QuantifierPusher]: treesize reduction 16, result has 87.0 percent of original size [2021-11-03 05:05:26,901 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 100 [2021-11-03 05:05:26,903 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:26,906 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:26,910 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:26,919 INFO L180 QuantifierPusher]: treesize reduction 11, result has 95.8 percent of original size [2021-11-03 05:05:26,922 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 251 [2021-11-03 05:05:26,925 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:26,936 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:26,936 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:26,937 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:26,937 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:26,938 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:26,939 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:26,941 INFO L180 QuantifierPusher]: treesize reduction 24, result has 70.7 percent of original size [2021-11-03 05:05:26,942 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 49 [2021-11-03 05:05:26,944 INFO L180 QuantifierPusher]: treesize reduction 25, result has 71.9 percent of original size [2021-11-03 05:05:26,945 INFO L185 QuantifierPusher]: treesize reduction 5, result has 90.6 percent of original size 48 [2021-11-03 05:05:26,946 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:26,949 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:26,952 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:26,957 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:05:26,958 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 120 [2021-11-03 05:05:26,960 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:27,018 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:27,018 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:27,019 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:27,019 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:27,019 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:27,021 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:27,023 INFO L180 QuantifierPusher]: treesize reduction 24, result has 71.8 percent of original size [2021-11-03 05:05:27,023 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 52 [2021-11-03 05:05:27,027 INFO L180 QuantifierPusher]: treesize reduction 25, result has 78.6 percent of original size [2021-11-03 05:05:27,028 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 87 [2021-11-03 05:05:27,029 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:27,033 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:27,033 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:27,034 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:27,034 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:27,035 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:27,038 INFO L180 QuantifierPusher]: treesize reduction 24, result has 78.2 percent of original size [2021-11-03 05:05:27,039 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 80 [2021-11-03 05:05:27,042 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 05:05:27,723 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 05:05:27,723 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 05:05:27,724 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 45 [2021-11-03 05:05:27,724 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [73200745] [2021-11-03 05:05:27,724 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2021-11-03 05:05:27,724 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:05:27,725 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-11-03 05:05:27,725 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=420, Invalid=2442, Unknown=0, NotChecked=0, Total=2862 [2021-11-03 05:05:27,725 INFO L87 Difference]: Start difference. First operand 65 states and 78 transitions. Second operand has 46 states, 46 states have (on average 2.1956521739130435) internal successors, (101), 45 states have internal predecessors, (101), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:05:29,582 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:05:29,582 INFO L93 Difference]: Finished difference Result 508 states and 531 transitions. [2021-11-03 05:05:29,582 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2021-11-03 05:05:29,582 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 2.1956521739130435) internal successors, (101), 45 states have internal predecessors, (101), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 52 [2021-11-03 05:05:29,583 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:05:29,584 INFO L225 Difference]: With dead ends: 508 [2021-11-03 05:05:29,584 INFO L226 Difference]: Without dead ends: 469 [2021-11-03 05:05:29,585 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 228 GetRequests, 128 SyntacticMatches, 0 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3412 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=1563, Invalid=8739, Unknown=0, NotChecked=0, Total=10302 [2021-11-03 05:05:29,586 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 469 states. [2021-11-03 05:05:29,694 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 469 to 65. [2021-11-03 05:05:29,694 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 64 states have (on average 1.21875) internal successors, (78), 64 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) [2021-11-03 05:05:29,694 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 78 transitions. [2021-11-03 05:05:29,694 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 78 transitions. Word has length 52 [2021-11-03 05:05:29,694 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:05:29,694 INFO L470 AbstractCegarLoop]: Abstraction has 65 states and 78 transitions. [2021-11-03 05:05:29,695 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 46 states have (on average 2.1956521739130435) internal successors, (101), 45 states have internal predecessors, (101), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:05:29,695 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 78 transitions. [2021-11-03 05:05:29,695 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-11-03 05:05:29,695 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:05:29,695 INFO L513 BasicCegarLoop]: trace histogram [12, 11, 11, 9, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:05:29,725 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (86)] Forceful destruction successful, exit code 0 [2021-11-03 05:05:29,896 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2261,86 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:05:29,896 INFO L402 AbstractCegarLoop]: === Iteration 87 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:05:29,896 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:05:29,896 INFO L85 PathProgramCache]: Analyzing trace with hash 1891190610, now seen corresponding path program 54 times [2021-11-03 05:05:29,896 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:05:29,896 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1392039164] [2021-11-03 05:05:29,897 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:05:29,897 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:05:29,953 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:05:30,279 INFO L134 CoverageAnalysis]: Checked inductivity of 235 backedges. 156 proven. 79 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:05:30,279 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:05:30,279 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1392039164] [2021-11-03 05:05:30,280 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1392039164] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 05:05:30,280 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1816977031] [2021-11-03 05:05:30,280 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-03 05:05:30,280 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:05:30,280 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 05:05:30,287 INFO L229 MonitoredProcess]: Starting monitored process 87 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 05:05:30,287 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (87)] Waiting until timeout for monitored process [2021-11-03 05:05:33,196 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-03 05:05:33,196 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 05:05:33,198 INFO L263 TraceCheckSpWp]: Trace formula consists of 216 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-03 05:05:33,198 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:05:33,808 INFO L134 CoverageAnalysis]: Checked inductivity of 235 backedges. 187 proven. 48 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:05:33,808 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:05:33,964 INFO L134 CoverageAnalysis]: Checked inductivity of 235 backedges. 187 proven. 48 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:05:33,964 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1816977031] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 05:05:33,964 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [366536410] [2021-11-03 05:05:33,965 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-03 05:05:33,965 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 05:05:33,965 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 05:05:33,965 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 05:05:33,965 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 05:05:33,967 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:05:33,967 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:05:33,967 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:05:33,968 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 05:05:33,968 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:05:33,968 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:05:33,968 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 05:05:33,969 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 111 [2021-11-03 05:05:33,970 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_92|], 10=[|v_#valid_93|]} [2021-11-03 05:05:33,974 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:05:33,975 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 [2021-11-03 05:05:33,975 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:05:33,975 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:05:33,976 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:05:33,976 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:05:33,976 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 05:05:33,976 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:33,978 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:05:33,980 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:05:33,980 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:05:33,981 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:05:33,984 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:05:33,984 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 [2021-11-03 05:05:33,984 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:05:33,985 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:05:33,986 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:05:33,986 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:05:33,986 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 05:05:33,986 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:33,988 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:05:33,988 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:05:33,989 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 05:05:33,989 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 05:05:33,989 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:108, output treesize:93 [2021-11-03 05:05:33,992 INFO L180 QuantifierPusher]: treesize reduction 16, result has 87.0 percent of original size [2021-11-03 05:05:33,993 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 102 [2021-11-03 05:05:33,995 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:33,998 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:34,002 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:34,012 INFO L180 QuantifierPusher]: treesize reduction 6, result has 97.7 percent of original size [2021-11-03 05:05:34,014 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 251 [2021-11-03 05:05:34,017 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:34,027 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:34,028 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:34,028 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:34,029 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:34,029 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:34,030 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:34,032 INFO L180 QuantifierPusher]: treesize reduction 24, result has 70.7 percent of original size [2021-11-03 05:05:34,033 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 49 [2021-11-03 05:05:34,035 INFO L180 QuantifierPusher]: treesize reduction 25, result has 71.9 percent of original size [2021-11-03 05:05:34,036 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 57 [2021-11-03 05:05:34,037 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:34,040 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:34,043 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:34,047 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:05:34,049 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 122 [2021-11-03 05:05:34,050 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:34,056 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:34,056 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:34,057 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:34,057 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:34,057 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:34,058 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:34,060 INFO L180 QuantifierPusher]: treesize reduction 24, result has 71.8 percent of original size [2021-11-03 05:05:34,061 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 52 [2021-11-03 05:05:34,064 INFO L180 QuantifierPusher]: treesize reduction 25, result has 78.6 percent of original size [2021-11-03 05:05:34,066 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 90 [2021-11-03 05:05:34,067 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:34,070 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:34,071 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:34,071 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:34,072 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:34,073 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:34,075 INFO L180 QuantifierPusher]: treesize reduction 24, result has 78.2 percent of original size [2021-11-03 05:05:34,076 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 80 [2021-11-03 05:05:34,080 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 05:05:34,754 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 05:05:34,754 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 05:05:34,755 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 44 [2021-11-03 05:05:34,755 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [80687577] [2021-11-03 05:05:34,755 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2021-11-03 05:05:34,755 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:05:34,755 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2021-11-03 05:05:34,756 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=418, Invalid=2338, Unknown=0, NotChecked=0, Total=2756 [2021-11-03 05:05:34,756 INFO L87 Difference]: Start difference. First operand 65 states and 78 transitions. Second operand has 45 states, 45 states have (on average 2.2222222222222223) internal successors, (100), 44 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) [2021-11-03 05:05:36,419 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:05:36,419 INFO L93 Difference]: Finished difference Result 548 states and 572 transitions. [2021-11-03 05:05:36,419 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2021-11-03 05:05:36,419 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 2.2222222222222223) internal successors, (100), 44 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) Word has length 52 [2021-11-03 05:05:36,419 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:05:36,421 INFO L225 Difference]: With dead ends: 548 [2021-11-03 05:05:36,421 INFO L226 Difference]: Without dead ends: 509 [2021-11-03 05:05:36,422 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 222 GetRequests, 129 SyntacticMatches, 0 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2867 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1360, Invalid=7570, Unknown=0, NotChecked=0, Total=8930 [2021-11-03 05:05:36,422 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 509 states. [2021-11-03 05:05:36,526 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 509 to 65. [2021-11-03 05:05:36,527 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 64 states have (on average 1.21875) internal successors, (78), 64 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) [2021-11-03 05:05:36,527 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 78 transitions. [2021-11-03 05:05:36,527 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 78 transitions. Word has length 52 [2021-11-03 05:05:36,527 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:05:36,527 INFO L470 AbstractCegarLoop]: Abstraction has 65 states and 78 transitions. [2021-11-03 05:05:36,527 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 45 states, 45 states have (on average 2.2222222222222223) internal successors, (100), 44 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) [2021-11-03 05:05:36,527 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 78 transitions. [2021-11-03 05:05:36,527 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-11-03 05:05:36,528 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:05:36,528 INFO L513 BasicCegarLoop]: trace histogram [12, 11, 11, 10, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:05:36,559 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (87)] Ended with exit code 0 [2021-11-03 05:05:36,728 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2290,87 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:05:36,728 INFO L402 AbstractCegarLoop]: === Iteration 88 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:05:36,728 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:05:36,728 INFO L85 PathProgramCache]: Analyzing trace with hash -1300767071, now seen corresponding path program 55 times [2021-11-03 05:05:36,728 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:05:36,729 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [22035456] [2021-11-03 05:05:36,729 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:05:36,729 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:05:36,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:05:36,986 INFO L134 CoverageAnalysis]: Checked inductivity of 243 backedges. 156 proven. 87 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:05:36,986 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:05:36,987 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [22035456] [2021-11-03 05:05:36,987 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [22035456] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 05:05:36,987 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1636907734] [2021-11-03 05:05:36,987 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-03 05:05:36,987 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:05:36,987 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 05:05:36,988 INFO L229 MonitoredProcess]: Starting monitored process 88 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 05:05:36,988 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (88)] Waiting until timeout for monitored process [2021-11-03 05:05:39,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:05:39,987 INFO L263 TraceCheckSpWp]: Trace formula consists of 216 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-03 05:05:39,988 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:05:40,561 INFO L134 CoverageAnalysis]: Checked inductivity of 243 backedges. 187 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:05:40,561 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:05:40,716 INFO L134 CoverageAnalysis]: Checked inductivity of 243 backedges. 187 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:05:40,717 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1636907734] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 05:05:40,717 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1578865330] [2021-11-03 05:05:40,717 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-03 05:05:40,717 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 05:05:40,718 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 05:05:40,718 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 05:05:40,718 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 05:05:40,720 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:05:40,720 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:05:40,720 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:05:40,721 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 05:05:40,721 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:05:40,721 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:05:40,722 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 05:05:40,722 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 111 [2021-11-03 05:05:40,729 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_93|], 10=[|v_#valid_94|]} [2021-11-03 05:05:40,733 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:05:40,734 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 [2021-11-03 05:05:40,734 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:05:40,734 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:05:40,734 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:05:40,735 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:05:40,735 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 05:05:40,735 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:40,736 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:05:40,740 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:05:40,740 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:05:40,741 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:05:40,744 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:05:40,744 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 [2021-11-03 05:05:40,745 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:05:40,746 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:05:40,746 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:05:40,746 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:05:40,746 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 05:05:40,746 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:40,748 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:05:40,748 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:05:40,749 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 05:05:40,749 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 05:05:40,749 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:108, output treesize:93 [2021-11-03 05:05:40,752 INFO L180 QuantifierPusher]: treesize reduction 16, result has 87.0 percent of original size [2021-11-03 05:05:40,754 INFO L185 QuantifierPusher]: treesize reduction 5, result has 94.8 percent of original size 91 [2021-11-03 05:05:40,755 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:40,759 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:40,762 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:40,772 INFO L180 QuantifierPusher]: treesize reduction 6, result has 97.7 percent of original size [2021-11-03 05:05:40,774 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 249 [2021-11-03 05:05:40,777 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:40,788 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:40,789 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:40,790 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:40,790 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:40,791 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:40,792 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:40,794 INFO L180 QuantifierPusher]: treesize reduction 24, result has 70.7 percent of original size [2021-11-03 05:05:40,795 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 49 [2021-11-03 05:05:40,797 INFO L180 QuantifierPusher]: treesize reduction 25, result has 71.9 percent of original size [2021-11-03 05:05:40,798 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 57 [2021-11-03 05:05:40,802 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:40,805 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:40,808 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:40,813 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:05:40,814 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 122 [2021-11-03 05:05:40,816 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:40,821 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:40,822 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:40,822 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:40,822 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:40,823 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:40,824 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:40,826 INFO L180 QuantifierPusher]: treesize reduction 24, result has 71.8 percent of original size [2021-11-03 05:05:40,827 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 52 [2021-11-03 05:05:40,830 INFO L180 QuantifierPusher]: treesize reduction 25, result has 78.6 percent of original size [2021-11-03 05:05:40,831 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 90 [2021-11-03 05:05:40,832 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:40,836 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:40,836 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:40,837 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:40,837 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:40,838 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:40,840 INFO L180 QuantifierPusher]: treesize reduction 24, result has 78.2 percent of original size [2021-11-03 05:05:40,842 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 80 [2021-11-03 05:05:40,845 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 05:05:41,520 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 05:05:41,520 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 05:05:41,520 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 43 [2021-11-03 05:05:41,521 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1544458683] [2021-11-03 05:05:41,521 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2021-11-03 05:05:41,521 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:05:41,521 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-11-03 05:05:41,521 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=420, Invalid=2232, Unknown=0, NotChecked=0, Total=2652 [2021-11-03 05:05:41,521 INFO L87 Difference]: Start difference. First operand 65 states and 78 transitions. Second operand has 44 states, 44 states have (on average 2.25) internal successors, (99), 43 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) [2021-11-03 05:05:43,166 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:05:43,166 INFO L93 Difference]: Finished difference Result 587 states and 612 transitions. [2021-11-03 05:05:43,167 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-11-03 05:05:43,167 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 2.25) internal successors, (99), 43 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 52 [2021-11-03 05:05:43,167 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:05:43,169 INFO L225 Difference]: With dead ends: 587 [2021-11-03 05:05:43,169 INFO L226 Difference]: Without dead ends: 548 [2021-11-03 05:05:43,169 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 214 GetRequests, 130 SyntacticMatches, 0 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2214 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1135, Invalid=6175, Unknown=0, NotChecked=0, Total=7310 [2021-11-03 05:05:43,170 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 548 states. [2021-11-03 05:05:43,276 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 548 to 65. [2021-11-03 05:05:43,277 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 64 states have (on average 1.21875) internal successors, (78), 64 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) [2021-11-03 05:05:43,277 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 78 transitions. [2021-11-03 05:05:43,277 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 78 transitions. Word has length 52 [2021-11-03 05:05:43,277 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:05:43,277 INFO L470 AbstractCegarLoop]: Abstraction has 65 states and 78 transitions. [2021-11-03 05:05:43,277 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 44 states have (on average 2.25) internal successors, (99), 43 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) [2021-11-03 05:05:43,277 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 78 transitions. [2021-11-03 05:05:43,277 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-11-03 05:05:43,277 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:05:43,277 INFO L513 BasicCegarLoop]: trace histogram [12, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:05:43,306 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (88)] Ended with exit code 0 [2021-11-03 05:05:43,478 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2319,88 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:05:43,478 INFO L402 AbstractCegarLoop]: === Iteration 89 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:05:43,478 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:05:43,478 INFO L85 PathProgramCache]: Analyzing trace with hash 535929202, now seen corresponding path program 11 times [2021-11-03 05:05:43,478 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:05:43,479 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [831643025] [2021-11-03 05:05:43,479 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:05:43,479 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:05:43,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:05:43,744 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 156 proven. 97 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:05:43,744 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:05:43,744 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [831643025] [2021-11-03 05:05:43,744 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [831643025] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 05:05:43,744 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1152012262] [2021-11-03 05:05:43,744 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-03 05:05:43,745 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:05:43,745 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 05:05:43,745 INFO L229 MonitoredProcess]: Starting monitored process 89 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 05:05:43,746 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (89)] Waiting until timeout for monitored process [2021-11-03 05:05:46,821 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2021-11-03 05:05:46,821 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 05:05:46,822 INFO L263 TraceCheckSpWp]: Trace formula consists of 216 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-03 05:05:46,823 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:05:47,420 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 187 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:05:47,420 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:05:47,585 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 187 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:05:47,586 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1152012262] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 05:05:47,586 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [648589026] [2021-11-03 05:05:47,586 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-03 05:05:47,586 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 05:05:47,587 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 05:05:47,587 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 05:05:47,587 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 05:05:47,589 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:05:47,589 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:05:47,590 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:05:47,590 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 05:05:47,590 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:05:47,590 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:05:47,591 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 05:05:47,592 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 111 [2021-11-03 05:05:47,593 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_94|], 10=[|v_#valid_95|]} [2021-11-03 05:05:47,597 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:05:47,598 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 [2021-11-03 05:05:47,598 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:05:47,599 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:05:47,599 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:05:47,599 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:05:47,599 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 05:05:47,600 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:47,601 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:05:47,604 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:05:47,604 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:05:47,605 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:05:47,608 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:05:47,609 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 [2021-11-03 05:05:47,609 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:05:47,610 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:05:47,611 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:05:47,611 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:05:47,611 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 05:05:47,611 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:47,613 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:05:47,614 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:05:47,615 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 05:05:47,615 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 05:05:47,615 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:108, output treesize:93 [2021-11-03 05:05:47,619 INFO L180 QuantifierPusher]: treesize reduction 16, result has 87.0 percent of original size [2021-11-03 05:05:47,620 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 100 [2021-11-03 05:05:47,622 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:47,626 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:47,632 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:47,643 INFO L180 QuantifierPusher]: treesize reduction 11, result has 95.8 percent of original size [2021-11-03 05:05:47,647 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 251 [2021-11-03 05:05:47,650 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:47,663 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:47,664 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:47,664 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:47,665 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:47,665 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:47,667 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:47,669 INFO L180 QuantifierPusher]: treesize reduction 24, result has 70.7 percent of original size [2021-11-03 05:05:47,671 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 49 [2021-11-03 05:05:47,675 INFO L180 QuantifierPusher]: treesize reduction 26, result has 78.5 percent of original size [2021-11-03 05:05:47,676 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 05:05:47,678 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:47,683 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:47,683 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:47,684 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:47,685 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:47,686 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:47,689 INFO L180 QuantifierPusher]: treesize reduction 30, result has 74.1 percent of original size [2021-11-03 05:05:47,691 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 80 [2021-11-03 05:05:47,695 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 05:05:48,437 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 05:05:48,438 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 05:05:48,438 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 42 [2021-11-03 05:05:48,438 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1909289631] [2021-11-03 05:05:48,438 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2021-11-03 05:05:48,438 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:05:48,438 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-11-03 05:05:48,439 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=425, Invalid=2125, Unknown=0, NotChecked=0, Total=2550 [2021-11-03 05:05:48,439 INFO L87 Difference]: Start difference. First operand 65 states and 78 transitions. Second operand has 43 states, 43 states have (on average 2.255813953488372) internal successors, (97), 42 states have internal predecessors, (97), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:05:49,989 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:05:49,989 INFO L93 Difference]: Finished difference Result 627 states and 654 transitions. [2021-11-03 05:05:49,989 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-11-03 05:05:49,989 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 2.255813953488372) internal successors, (97), 42 states have internal predecessors, (97), 0 states have call successors, (0), 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 52 [2021-11-03 05:05:49,989 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:05:49,991 INFO L225 Difference]: With dead ends: 627 [2021-11-03 05:05:49,991 INFO L226 Difference]: Without dead ends: 588 [2021-11-03 05:05:49,991 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 204 GetRequests, 131 SyntacticMatches, 0 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1565 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=926, Invalid=4624, Unknown=0, NotChecked=0, Total=5550 [2021-11-03 05:05:49,992 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 588 states. [2021-11-03 05:05:50,106 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 588 to 66. [2021-11-03 05:05:50,106 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 66 states, 65 states have (on average 1.2307692307692308) internal successors, (80), 65 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) [2021-11-03 05:05:50,106 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 80 transitions. [2021-11-03 05:05:50,106 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 80 transitions. Word has length 52 [2021-11-03 05:05:50,107 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:05:50,107 INFO L470 AbstractCegarLoop]: Abstraction has 66 states and 80 transitions. [2021-11-03 05:05:50,107 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 43 states have (on average 2.255813953488372) internal successors, (97), 42 states have internal predecessors, (97), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:05:50,107 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 80 transitions. [2021-11-03 05:05:50,107 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-11-03 05:05:50,107 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:05:50,107 INFO L513 BasicCegarLoop]: trace histogram [12, 12, 11, 11, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:05:50,137 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (89)] Forceful destruction successful, exit code 0 [2021-11-03 05:05:50,307 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 89 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2348 [2021-11-03 05:05:50,308 INFO L402 AbstractCegarLoop]: === Iteration 90 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:05:50,308 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:05:50,308 INFO L85 PathProgramCache]: Analyzing trace with hash 1303066309, now seen corresponding path program 22 times [2021-11-03 05:05:50,308 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:05:50,308 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1537844519] [2021-11-03 05:05:50,308 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:05:50,308 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:05:50,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:05:50,455 INFO L134 CoverageAnalysis]: Checked inductivity of 265 backedges. 66 proven. 199 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:05:50,455 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:05:50,455 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1537844519] [2021-11-03 05:05:50,455 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1537844519] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 05:05:50,455 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [325876857] [2021-11-03 05:05:50,456 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-03 05:05:50,456 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:05:50,456 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 05:05:50,456 INFO L229 MonitoredProcess]: Starting monitored process 90 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 05:05:50,457 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (90)] Waiting until timeout for monitored process [2021-11-03 05:05:53,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:05:53,508 INFO L263 TraceCheckSpWp]: Trace formula consists of 221 conjuncts, 27 conjunts are in the unsatisfiable core [2021-11-03 05:05:53,509 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:05:53,641 INFO L134 CoverageAnalysis]: Checked inductivity of 265 backedges. 78 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:05:53,641 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:05:53,805 INFO L134 CoverageAnalysis]: Checked inductivity of 265 backedges. 78 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:05:53,805 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [325876857] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 05:05:53,805 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [670704580] [2021-11-03 05:05:53,806 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-03 05:05:53,806 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 05:05:53,806 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 05:05:53,806 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 05:05:53,806 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 05:05:53,814 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:05:53,814 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:05:53,814 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:05:53,814 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 05:05:53,815 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:05:53,815 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:05:53,815 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 05:05:53,817 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 111 [2021-11-03 05:05:53,818 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_95|], 10=[|v_#valid_96|]} [2021-11-03 05:05:53,822 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:05:53,823 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 [2021-11-03 05:05:53,823 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:05:53,823 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:05:53,824 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:05:53,824 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:05:53,824 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 05:05:53,824 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:53,826 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:05:53,828 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:05:53,829 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:05:53,829 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:05:53,832 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:05:53,832 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 [2021-11-03 05:05:53,833 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:05:53,834 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:05:53,834 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:05:53,834 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:05:53,835 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 05:05:53,835 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:53,836 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:05:53,837 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:05:53,837 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 05:05:53,837 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 05:05:53,838 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:108, output treesize:93 [2021-11-03 05:05:53,842 INFO L180 QuantifierPusher]: treesize reduction 17, result has 86.9 percent of original size [2021-11-03 05:05:53,843 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 106 [2021-11-03 05:05:53,845 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:53,849 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:53,853 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:53,863 INFO L180 QuantifierPusher]: treesize reduction 12, result has 95.7 percent of original size [2021-11-03 05:05:53,866 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 269 [2021-11-03 05:05:53,869 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:53,883 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:53,883 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:53,884 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:53,884 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:53,885 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:53,886 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:53,888 INFO L180 QuantifierPusher]: treesize reduction 30, result has 67.0 percent of original size [2021-11-03 05:05:53,889 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 52 [2021-11-03 05:05:53,893 INFO L180 QuantifierPusher]: treesize reduction 31, result has 74.8 percent of original size [2021-11-03 05:05:53,894 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 87 [2021-11-03 05:05:53,895 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:53,899 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:53,900 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:53,900 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:53,900 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:53,902 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:53,905 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:05:53,907 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 138 [2021-11-03 05:05:53,909 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:53,914 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:53,915 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:53,915 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:53,915 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:53,916 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:53,916 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:53,917 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:53,918 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:53,921 INFO L180 QuantifierPusher]: treesize reduction 30, result has 74.1 percent of original size [2021-11-03 05:05:53,922 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 80 [2021-11-03 05:05:53,926 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 05:05:54,590 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 05:05:54,590 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 05:05:54,590 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 17 [2021-11-03 05:05:54,590 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1650762561] [2021-11-03 05:05:54,591 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-03 05:05:54,591 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:05:54,591 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-03 05:05:54,591 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=149, Invalid=501, Unknown=0, NotChecked=0, Total=650 [2021-11-03 05:05:54,591 INFO L87 Difference]: Start difference. First operand 66 states and 80 transitions. Second operand has 18 states, 18 states have (on average 3.3333333333333335) internal successors, (60), 17 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) [2021-11-03 05:05:54,955 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:05:54,955 INFO L93 Difference]: Finished difference Result 77 states and 91 transitions. [2021-11-03 05:05:54,955 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-11-03 05:05:54,955 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 3.3333333333333335) internal successors, (60), 17 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) Word has length 53 [2021-11-03 05:05:54,955 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:05:54,956 INFO L225 Difference]: With dead ends: 77 [2021-11-03 05:05:54,956 INFO L226 Difference]: Without dead ends: 75 [2021-11-03 05:05:54,956 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 197 GetRequests, 157 SyntacticMatches, 2 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 430 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=390, Invalid=1170, Unknown=0, NotChecked=0, Total=1560 [2021-11-03 05:05:54,956 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2021-11-03 05:05:55,073 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 69. [2021-11-03 05:05:55,073 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69 states, 68 states have (on average 1.2205882352941178) internal successors, (83), 68 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) [2021-11-03 05:05:55,073 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 83 transitions. [2021-11-03 05:05:55,073 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 83 transitions. Word has length 53 [2021-11-03 05:05:55,073 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:05:55,073 INFO L470 AbstractCegarLoop]: Abstraction has 69 states and 83 transitions. [2021-11-03 05:05:55,073 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 3.3333333333333335) internal successors, (60), 17 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) [2021-11-03 05:05:55,073 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 83 transitions. [2021-11-03 05:05:55,074 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-11-03 05:05:55,074 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:05:55,074 INFO L513 BasicCegarLoop]: trace histogram [13, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:05:55,103 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (90)] Ended with exit code 0 [2021-11-03 05:05:55,277 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 90 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2367 [2021-11-03 05:05:55,277 INFO L402 AbstractCegarLoop]: === Iteration 91 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:05:55,277 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:05:55,277 INFO L85 PathProgramCache]: Analyzing trace with hash 1738833291, now seen corresponding path program 23 times [2021-11-03 05:05:55,277 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:05:55,277 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [237027295] [2021-11-03 05:05:55,277 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:05:55,277 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:05:55,304 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:05:55,581 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 188 proven. 112 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:05:55,581 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:05:55,581 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [237027295] [2021-11-03 05:05:55,581 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [237027295] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 05:05:55,581 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1168873710] [2021-11-03 05:05:55,581 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-03 05:05:55,581 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:05:55,582 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 05:05:55,582 INFO L229 MonitoredProcess]: Starting monitored process 91 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 05:05:55,583 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (91)] Waiting until timeout for monitored process [2021-11-03 05:05:58,669 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 13 check-sat command(s) [2021-11-03 05:05:58,669 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 05:05:58,671 INFO L263 TraceCheckSpWp]: Trace formula consists of 231 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-03 05:05:58,672 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:05:59,571 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 222 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:05:59,571 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:05:59,743 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 222 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:05:59,743 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1168873710] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 05:05:59,743 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [850412543] [2021-11-03 05:05:59,744 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-03 05:05:59,744 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 05:05:59,744 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 05:05:59,744 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 05:05:59,744 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 05:05:59,746 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:05:59,746 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:05:59,746 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:05:59,747 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 05:05:59,747 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:05:59,747 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:05:59,747 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 05:05:59,748 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 111 [2021-11-03 05:05:59,749 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_96|], 10=[|v_#valid_97|]} [2021-11-03 05:05:59,753 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:05:59,754 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 [2021-11-03 05:05:59,754 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:05:59,754 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:05:59,754 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:05:59,755 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:05:59,755 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 05:05:59,755 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:59,756 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:05:59,759 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:05:59,759 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:05:59,760 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:05:59,763 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:05:59,763 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 [2021-11-03 05:05:59,764 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:05:59,765 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:05:59,765 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:05:59,765 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:05:59,766 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 05:05:59,766 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:59,767 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:05:59,768 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:05:59,768 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 05:05:59,768 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 05:05:59,768 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:108, output treesize:93 [2021-11-03 05:05:59,773 INFO L180 QuantifierPusher]: treesize reduction 17, result has 86.9 percent of original size [2021-11-03 05:05:59,774 INFO L185 QuantifierPusher]: treesize reduction 5, result has 95.1 percent of original size 97 [2021-11-03 05:05:59,776 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:59,780 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:59,784 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:59,795 INFO L180 QuantifierPusher]: treesize reduction 12, result has 95.7 percent of original size [2021-11-03 05:05:59,798 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 267 [2021-11-03 05:05:59,800 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:59,815 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:59,816 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:59,816 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:59,816 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:59,817 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:59,818 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:59,821 INFO L180 QuantifierPusher]: treesize reduction 30, result has 67.0 percent of original size [2021-11-03 05:05:59,822 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 52 [2021-11-03 05:05:59,825 INFO L180 QuantifierPusher]: treesize reduction 31, result has 74.8 percent of original size [2021-11-03 05:05:59,826 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 90 [2021-11-03 05:05:59,827 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:59,831 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:59,832 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:59,832 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:59,833 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:59,834 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:05:59,836 INFO L180 QuantifierPusher]: treesize reduction 30, result has 74.1 percent of original size [2021-11-03 05:05:59,838 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 80 [2021-11-03 05:05:59,841 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 05:06:00,627 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 05:06:00,627 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 05:06:00,627 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 57 [2021-11-03 05:06:00,627 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1901272698] [2021-11-03 05:06:00,627 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 58 states [2021-11-03 05:06:00,627 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:06:00,628 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2021-11-03 05:06:00,628 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=676, Invalid=3614, Unknown=0, NotChecked=0, Total=4290 [2021-11-03 05:06:00,628 INFO L87 Difference]: Start difference. First operand 69 states and 83 transitions. Second operand has 58 states, 58 states have (on average 2.0) internal successors, (116), 57 states have internal predecessors, (116), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:06:01,544 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:06:01,544 INFO L93 Difference]: Finished difference Result 164 states and 180 transitions. [2021-11-03 05:06:01,544 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-11-03 05:06:01,545 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 58 states have (on average 2.0) internal successors, (116), 57 states have internal predecessors, (116), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 56 [2021-11-03 05:06:01,545 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:06:01,545 INFO L225 Difference]: With dead ends: 164 [2021-11-03 05:06:01,545 INFO L226 Difference]: Without dead ends: 122 [2021-11-03 05:06:01,546 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 220 GetRequests, 130 SyntacticMatches, 0 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2936 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=1329, Invalid=7043, Unknown=0, NotChecked=0, Total=8372 [2021-11-03 05:06:01,546 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2021-11-03 05:06:01,674 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 70. [2021-11-03 05:06:01,675 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 69 states have (on average 1.2173913043478262) internal successors, (84), 69 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) [2021-11-03 05:06:01,675 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 84 transitions. [2021-11-03 05:06:01,675 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 84 transitions. Word has length 56 [2021-11-03 05:06:01,675 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:06:01,675 INFO L470 AbstractCegarLoop]: Abstraction has 70 states and 84 transitions. [2021-11-03 05:06:01,675 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 58 states, 58 states have (on average 2.0) internal successors, (116), 57 states have internal predecessors, (116), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:06:01,675 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 84 transitions. [2021-11-03 05:06:01,675 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-11-03 05:06:01,675 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:06:01,676 INFO L513 BasicCegarLoop]: trace histogram [13, 12, 12, 11, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:06:01,707 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (91)] Forceful destruction successful, exit code 0 [2021-11-03 05:06:01,881 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2395,91 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:06:01,881 INFO L402 AbstractCegarLoop]: === Iteration 92 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:06:01,881 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:06:01,881 INFO L85 PathProgramCache]: Analyzing trace with hash -268140900, now seen corresponding path program 56 times [2021-11-03 05:06:01,881 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:06:01,881 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1116058190] [2021-11-03 05:06:01,881 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:06:01,881 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:06:01,908 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:06:02,185 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 188 proven. 101 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:06:02,185 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:06:02,185 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1116058190] [2021-11-03 05:06:02,185 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1116058190] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 05:06:02,185 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1487174345] [2021-11-03 05:06:02,185 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-03 05:06:02,185 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:06:02,185 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 05:06:02,186 INFO L229 MonitoredProcess]: Starting monitored process 92 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 05:06:02,187 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (92)] Waiting until timeout for monitored process [2021-11-03 05:06:05,337 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 13 check-sat command(s) [2021-11-03 05:06:05,338 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 05:06:05,339 INFO L263 TraceCheckSpWp]: Trace formula consists of 231 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-03 05:06:05,340 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:06:06,154 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 222 proven. 67 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:06:06,154 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:06:06,323 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 222 proven. 67 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:06:06,323 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1487174345] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 05:06:06,323 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [478714581] [2021-11-03 05:06:06,324 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-03 05:06:06,324 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 05:06:06,324 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 05:06:06,324 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 05:06:06,324 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 05:06:06,326 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:06:06,326 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:06:06,326 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:06:06,327 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 05:06:06,327 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:06:06,327 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:06:06,328 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 05:06:06,328 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 111 [2021-11-03 05:06:06,329 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_97|], 10=[|v_#valid_98|]} [2021-11-03 05:06:06,333 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:06:06,334 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 [2021-11-03 05:06:06,334 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:06:06,334 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:06:06,335 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:06:06,335 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:06:06,335 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 05:06:06,335 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:06,337 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:06:06,339 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:06:06,339 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:06:06,340 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:06:06,343 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:06:06,343 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 [2021-11-03 05:06:06,344 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:06:06,345 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:06:06,345 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:06:06,345 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:06:06,345 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 05:06:06,345 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:06,347 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:06:06,347 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:06:06,348 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 05:06:06,348 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 05:06:06,348 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:108, output treesize:93 [2021-11-03 05:06:06,351 INFO L180 QuantifierPusher]: treesize reduction 16, result has 87.0 percent of original size [2021-11-03 05:06:06,352 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 102 [2021-11-03 05:06:06,354 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:06,358 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:06,362 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:06,371 INFO L180 QuantifierPusher]: treesize reduction 6, result has 97.7 percent of original size [2021-11-03 05:06:06,373 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 251 [2021-11-03 05:06:06,376 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:06,386 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:06,387 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:06,387 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:06,388 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:06,388 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:06,389 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:06,391 INFO L180 QuantifierPusher]: treesize reduction 24, result has 70.7 percent of original size [2021-11-03 05:06:06,392 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 49 [2021-11-03 05:06:06,395 INFO L180 QuantifierPusher]: treesize reduction 25, result has 71.9 percent of original size [2021-11-03 05:06:06,396 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 57 [2021-11-03 05:06:06,397 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:06,399 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:06,402 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:06,407 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:06:06,408 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 122 [2021-11-03 05:06:06,410 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:06,415 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:06,416 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:06,416 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:06,417 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:06,417 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:06,418 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:06,420 INFO L180 QuantifierPusher]: treesize reduction 24, result has 71.8 percent of original size [2021-11-03 05:06:06,421 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 52 [2021-11-03 05:06:06,430 INFO L180 QuantifierPusher]: treesize reduction 25, result has 78.6 percent of original size [2021-11-03 05:06:06,432 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 87 [2021-11-03 05:06:06,433 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:06,436 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:06,437 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:06,437 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:06,438 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:06,439 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:06,441 INFO L180 QuantifierPusher]: treesize reduction 24, result has 78.2 percent of original size [2021-11-03 05:06:06,442 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 80 [2021-11-03 05:06:06,446 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 05:06:07,214 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 05:06:07,214 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 05:06:07,214 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 56 [2021-11-03 05:06:07,214 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [988149299] [2021-11-03 05:06:07,215 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 57 states [2021-11-03 05:06:07,215 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:06:07,215 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2021-11-03 05:06:07,215 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=627, Invalid=3533, Unknown=0, NotChecked=0, Total=4160 [2021-11-03 05:06:07,215 INFO L87 Difference]: Start difference. First operand 70 states and 84 transitions. Second operand has 57 states, 57 states have (on average 2.0350877192982457) internal successors, (116), 56 states have internal predecessors, (116), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:06:08,335 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:06:08,335 INFO L93 Difference]: Finished difference Result 216 states and 233 transitions. [2021-11-03 05:06:08,335 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-11-03 05:06:08,335 INFO L78 Accepts]: Start accepts. Automaton has has 57 states, 57 states have (on average 2.0350877192982457) internal successors, (116), 56 states have internal predecessors, (116), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 56 [2021-11-03 05:06:08,335 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:06:08,336 INFO L225 Difference]: With dead ends: 216 [2021-11-03 05:06:08,336 INFO L226 Difference]: Without dead ends: 174 [2021-11-03 05:06:08,337 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 231 GetRequests, 131 SyntacticMatches, 0 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3599 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=1574, Invalid=8728, Unknown=0, NotChecked=0, Total=10302 [2021-11-03 05:06:08,337 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 174 states. [2021-11-03 05:06:08,469 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 174 to 70. [2021-11-03 05:06:08,469 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 69 states have (on average 1.2173913043478262) internal successors, (84), 69 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) [2021-11-03 05:06:08,469 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 84 transitions. [2021-11-03 05:06:08,469 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 84 transitions. Word has length 56 [2021-11-03 05:06:08,470 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:06:08,470 INFO L470 AbstractCegarLoop]: Abstraction has 70 states and 84 transitions. [2021-11-03 05:06:08,470 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 57 states, 57 states have (on average 2.0350877192982457) internal successors, (116), 56 states have internal predecessors, (116), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:06:08,470 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 84 transitions. [2021-11-03 05:06:08,470 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-11-03 05:06:08,470 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:06:08,470 INFO L513 BasicCegarLoop]: trace histogram [13, 12, 12, 10, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:06:08,500 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (92)] Forceful destruction successful, exit code 0 [2021-11-03 05:06:08,670 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 92 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2414 [2021-11-03 05:06:08,671 INFO L402 AbstractCegarLoop]: === Iteration 93 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:06:08,671 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:06:08,671 INFO L85 PathProgramCache]: Analyzing trace with hash 1745327979, now seen corresponding path program 57 times [2021-11-03 05:06:08,671 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:06:08,671 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [212144354] [2021-11-03 05:06:08,671 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:06:08,671 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:06:08,700 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:06:08,975 INFO L134 CoverageAnalysis]: Checked inductivity of 280 backedges. 188 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:06:08,975 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:06:08,975 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [212144354] [2021-11-03 05:06:08,975 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [212144354] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 05:06:08,975 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1834505781] [2021-11-03 05:06:08,975 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-03 05:06:08,975 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:06:08,976 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 05:06:08,976 INFO L229 MonitoredProcess]: Starting monitored process 93 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 05:06:08,977 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (93)] Waiting until timeout for monitored process [2021-11-03 05:06:12,244 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-03 05:06:12,244 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 05:06:12,246 INFO L263 TraceCheckSpWp]: Trace formula consists of 231 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-03 05:06:12,247 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:06:13,081 INFO L134 CoverageAnalysis]: Checked inductivity of 280 backedges. 222 proven. 58 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:06:13,081 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:06:13,260 INFO L134 CoverageAnalysis]: Checked inductivity of 280 backedges. 222 proven. 58 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:06:13,260 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1834505781] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 05:06:13,260 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [649968499] [2021-11-03 05:06:13,261 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-03 05:06:13,261 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 05:06:13,261 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 05:06:13,261 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 05:06:13,261 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 05:06:13,263 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:06:13,264 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:06:13,264 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:06:13,264 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 05:06:13,265 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:06:13,265 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:06:13,265 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 05:06:13,266 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 111 [2021-11-03 05:06:13,267 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_98|], 10=[|v_#valid_99|]} [2021-11-03 05:06:13,271 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:06:13,272 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 [2021-11-03 05:06:13,272 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:06:13,273 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:06:13,273 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:06:13,273 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:06:13,273 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 05:06:13,274 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:13,275 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:06:13,278 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:06:13,278 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:06:13,279 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:06:13,282 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:06:13,283 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 [2021-11-03 05:06:13,283 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:06:13,284 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:06:13,284 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:06:13,285 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:06:13,285 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 05:06:13,285 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:13,287 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:06:13,288 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:06:13,288 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 05:06:13,289 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 05:06:13,289 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:108, output treesize:93 [2021-11-03 05:06:13,292 INFO L180 QuantifierPusher]: treesize reduction 16, result has 87.0 percent of original size [2021-11-03 05:06:13,294 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 102 [2021-11-03 05:06:13,295 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:13,300 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:13,305 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:13,317 INFO L180 QuantifierPusher]: treesize reduction 6, result has 97.7 percent of original size [2021-11-03 05:06:13,321 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 251 [2021-11-03 05:06:13,323 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:13,337 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:13,337 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:13,338 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:13,338 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:13,339 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:13,340 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:13,343 INFO L180 QuantifierPusher]: treesize reduction 24, result has 70.7 percent of original size [2021-11-03 05:06:13,344 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 49 [2021-11-03 05:06:13,347 INFO L180 QuantifierPusher]: treesize reduction 25, result has 71.9 percent of original size [2021-11-03 05:06:13,348 INFO L185 QuantifierPusher]: treesize reduction 5, result has 90.6 percent of original size 48 [2021-11-03 05:06:13,349 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:13,352 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:13,356 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:13,363 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:06:13,365 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 120 [2021-11-03 05:06:13,366 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:13,373 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:13,374 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:13,374 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:13,375 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:13,375 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:13,376 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:13,379 INFO L180 QuantifierPusher]: treesize reduction 24, result has 71.8 percent of original size [2021-11-03 05:06:13,380 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 52 [2021-11-03 05:06:13,384 INFO L180 QuantifierPusher]: treesize reduction 25, result has 78.6 percent of original size [2021-11-03 05:06:13,385 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 87 [2021-11-03 05:06:13,387 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:13,391 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:13,392 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:13,392 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:13,394 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:13,396 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:13,399 INFO L180 QuantifierPusher]: treesize reduction 24, result has 78.2 percent of original size [2021-11-03 05:06:13,401 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 80 [2021-11-03 05:06:13,404 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 05:06:14,144 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 05:06:14,144 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 05:06:14,145 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 55 [2021-11-03 05:06:14,145 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [305425323] [2021-11-03 05:06:14,145 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 56 states [2021-11-03 05:06:14,145 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:06:14,145 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2021-11-03 05:06:14,146 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=594, Invalid=3438, Unknown=0, NotChecked=0, Total=4032 [2021-11-03 05:06:14,146 INFO L87 Difference]: Start difference. First operand 70 states and 84 transitions. Second operand has 56 states, 56 states have (on average 2.0535714285714284) internal successors, (115), 55 states have internal predecessors, (115), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:06:15,590 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:06:15,590 INFO L93 Difference]: Finished difference Result 267 states and 285 transitions. [2021-11-03 05:06:15,590 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2021-11-03 05:06:15,590 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 56 states have (on average 2.0535714285714284) internal successors, (115), 55 states have internal predecessors, (115), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 56 [2021-11-03 05:06:15,590 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:06:15,591 INFO L225 Difference]: With dead ends: 267 [2021-11-03 05:06:15,591 INFO L226 Difference]: Without dead ends: 225 [2021-11-03 05:06:15,592 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 240 GetRequests, 132 SyntacticMatches, 0 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4192 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=1826, Invalid=10164, Unknown=0, NotChecked=0, Total=11990 [2021-11-03 05:06:15,593 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 225 states. [2021-11-03 05:06:15,736 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 225 to 70. [2021-11-03 05:06:15,736 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 69 states have (on average 1.2173913043478262) internal successors, (84), 69 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) [2021-11-03 05:06:15,736 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 84 transitions. [2021-11-03 05:06:15,736 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 84 transitions. Word has length 56 [2021-11-03 05:06:15,737 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:06:15,737 INFO L470 AbstractCegarLoop]: Abstraction has 70 states and 84 transitions. [2021-11-03 05:06:15,737 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 56 states, 56 states have (on average 2.0535714285714284) internal successors, (115), 55 states have internal predecessors, (115), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:06:15,737 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 84 transitions. [2021-11-03 05:06:15,737 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-11-03 05:06:15,737 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:06:15,737 INFO L513 BasicCegarLoop]: trace histogram [13, 12, 12, 9, 3, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:06:15,768 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (93)] Forceful destruction successful, exit code 0 [2021-11-03 05:06:15,937 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 93 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2443 [2021-11-03 05:06:15,938 INFO L402 AbstractCegarLoop]: === Iteration 94 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:06:15,938 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:06:15,938 INFO L85 PathProgramCache]: Analyzing trace with hash 1810278588, now seen corresponding path program 58 times [2021-11-03 05:06:15,938 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:06:15,938 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [96283311] [2021-11-03 05:06:15,938 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:06:15,938 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:06:15,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:06:16,241 INFO L134 CoverageAnalysis]: Checked inductivity of 273 backedges. 188 proven. 85 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:06:16,241 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:06:16,241 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [96283311] [2021-11-03 05:06:16,241 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [96283311] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 05:06:16,241 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1885428016] [2021-11-03 05:06:16,241 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-03 05:06:16,241 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:06:16,241 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 05:06:16,242 INFO L229 MonitoredProcess]: Starting monitored process 94 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 05:06:16,244 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (94)] Waiting until timeout for monitored process [2021-11-03 05:06:19,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:06:19,547 INFO L263 TraceCheckSpWp]: Trace formula consists of 231 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-03 05:06:19,547 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:06:20,324 INFO L134 CoverageAnalysis]: Checked inductivity of 273 backedges. 222 proven. 51 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:06:20,324 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:06:20,501 INFO L134 CoverageAnalysis]: Checked inductivity of 273 backedges. 222 proven. 51 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:06:20,501 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1885428016] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 05:06:20,501 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [356109672] [2021-11-03 05:06:20,502 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-03 05:06:20,502 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 05:06:20,502 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 05:06:20,502 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 05:06:20,502 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 05:06:20,504 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:06:20,504 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:06:20,505 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:06:20,505 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 05:06:20,506 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:06:20,506 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:06:20,506 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 05:06:20,507 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 111 [2021-11-03 05:06:20,508 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_99|], 10=[|v_#valid_100|]} [2021-11-03 05:06:20,512 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:06:20,512 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 [2021-11-03 05:06:20,513 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:06:20,513 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:06:20,513 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:06:20,513 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:06:20,514 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 05:06:20,514 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:20,515 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:06:20,517 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:06:20,518 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:06:20,519 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:06:20,521 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:06:20,522 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 [2021-11-03 05:06:20,522 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:06:20,523 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:06:20,523 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:06:20,524 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:06:20,524 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 05:06:20,524 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:20,525 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:06:20,526 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:06:20,527 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 05:06:20,527 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 05:06:20,527 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:108, output treesize:93 [2021-11-03 05:06:20,530 INFO L180 QuantifierPusher]: treesize reduction 16, result has 87.0 percent of original size [2021-11-03 05:06:20,531 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 102 [2021-11-03 05:06:20,542 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:20,548 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:20,554 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:20,569 INFO L180 QuantifierPusher]: treesize reduction 6, result has 97.7 percent of original size [2021-11-03 05:06:20,573 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 251 [2021-11-03 05:06:20,577 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:20,593 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:20,594 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:20,595 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:20,595 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:20,596 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:20,598 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:20,601 INFO L180 QuantifierPusher]: treesize reduction 24, result has 70.7 percent of original size [2021-11-03 05:06:20,602 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 49 [2021-11-03 05:06:20,605 INFO L180 QuantifierPusher]: treesize reduction 25, result has 71.9 percent of original size [2021-11-03 05:06:20,607 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 57 [2021-11-03 05:06:20,608 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:20,612 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:20,617 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:20,624 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:06:20,626 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 122 [2021-11-03 05:06:20,628 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:20,637 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:20,638 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:20,638 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:20,639 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:20,639 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:20,641 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:20,644 INFO L180 QuantifierPusher]: treesize reduction 24, result has 71.8 percent of original size [2021-11-03 05:06:20,645 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 52 [2021-11-03 05:06:20,649 INFO L180 QuantifierPusher]: treesize reduction 25, result has 78.6 percent of original size [2021-11-03 05:06:20,651 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 87 [2021-11-03 05:06:20,653 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:20,658 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:20,659 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:20,660 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:20,660 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:20,662 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:20,666 INFO L180 QuantifierPusher]: treesize reduction 24, result has 78.2 percent of original size [2021-11-03 05:06:20,668 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 80 [2021-11-03 05:06:20,672 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 05:06:21,387 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 05:06:21,387 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 05:06:21,387 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 54 [2021-11-03 05:06:21,387 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [193339643] [2021-11-03 05:06:21,387 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2021-11-03 05:06:21,387 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:06:21,388 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2021-11-03 05:06:21,388 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=565, Invalid=3341, Unknown=0, NotChecked=0, Total=3906 [2021-11-03 05:06:21,388 INFO L87 Difference]: Start difference. First operand 70 states and 84 transitions. Second operand has 55 states, 55 states have (on average 2.0727272727272728) internal successors, (114), 54 states have internal predecessors, (114), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:06:23,125 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:06:23,126 INFO L93 Difference]: Finished difference Result 317 states and 336 transitions. [2021-11-03 05:06:23,126 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2021-11-03 05:06:23,126 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 55 states have (on average 2.0727272727272728) internal successors, (114), 54 states have internal predecessors, (114), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 56 [2021-11-03 05:06:23,126 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:06:23,127 INFO L225 Difference]: With dead ends: 317 [2021-11-03 05:06:23,127 INFO L226 Difference]: Without dead ends: 275 [2021-11-03 05:06:23,128 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 247 GetRequests, 133 SyntacticMatches, 0 SemanticMatches, 114 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4668 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=2036, Invalid=11304, Unknown=0, NotChecked=0, Total=13340 [2021-11-03 05:06:23,128 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 275 states. [2021-11-03 05:06:23,273 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 275 to 70. [2021-11-03 05:06:23,274 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 69 states have (on average 1.2173913043478262) internal successors, (84), 69 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) [2021-11-03 05:06:23,274 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 84 transitions. [2021-11-03 05:06:23,274 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 84 transitions. Word has length 56 [2021-11-03 05:06:23,274 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:06:23,274 INFO L470 AbstractCegarLoop]: Abstraction has 70 states and 84 transitions. [2021-11-03 05:06:23,275 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 55 states, 55 states have (on average 2.0727272727272728) internal successors, (114), 54 states have internal predecessors, (114), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:06:23,275 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 84 transitions. [2021-11-03 05:06:23,275 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-11-03 05:06:23,275 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:06:23,275 INFO L513 BasicCegarLoop]: trace histogram [13, 12, 12, 8, 4, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:06:23,307 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (94)] Forceful destruction successful, exit code 0 [2021-11-03 05:06:23,481 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2472,94 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:06:23,481 INFO L402 AbstractCegarLoop]: === Iteration 95 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:06:23,481 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:06:23,481 INFO L85 PathProgramCache]: Analyzing trace with hash -265836213, now seen corresponding path program 59 times [2021-11-03 05:06:23,481 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:06:23,481 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1015040959] [2021-11-03 05:06:23,481 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:06:23,482 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:06:23,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:06:23,807 INFO L134 CoverageAnalysis]: Checked inductivity of 268 backedges. 188 proven. 80 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:06:23,807 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:06:23,807 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1015040959] [2021-11-03 05:06:23,807 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1015040959] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 05:06:23,807 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1326329421] [2021-11-03 05:06:23,807 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-03 05:06:23,807 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:06:23,807 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 05:06:23,808 INFO L229 MonitoredProcess]: Starting monitored process 95 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 05:06:23,809 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (95)] Waiting until timeout for monitored process [2021-11-03 05:06:27,136 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 13 check-sat command(s) [2021-11-03 05:06:27,136 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 05:06:27,138 INFO L263 TraceCheckSpWp]: Trace formula consists of 231 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-03 05:06:27,139 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:06:27,911 INFO L134 CoverageAnalysis]: Checked inductivity of 268 backedges. 222 proven. 46 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:06:27,912 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:06:28,080 INFO L134 CoverageAnalysis]: Checked inductivity of 268 backedges. 222 proven. 46 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:06:28,080 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1326329421] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 05:06:28,080 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1508526557] [2021-11-03 05:06:28,081 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-03 05:06:28,081 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 05:06:28,081 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 05:06:28,081 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 05:06:28,081 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 05:06:28,083 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:06:28,083 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:06:28,083 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:06:28,083 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 05:06:28,084 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:06:28,084 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:06:28,084 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 05:06:28,085 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 111 [2021-11-03 05:06:28,086 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_100|], 10=[|v_#valid_101|]} [2021-11-03 05:06:28,090 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:06:28,091 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 [2021-11-03 05:06:28,091 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:06:28,091 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:06:28,092 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:06:28,092 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:06:28,092 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 05:06:28,092 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:28,094 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:06:28,096 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:06:28,096 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:06:28,097 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:06:28,100 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:06:28,100 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 [2021-11-03 05:06:28,101 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:06:28,102 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:06:28,102 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:06:28,102 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:06:28,102 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 05:06:28,103 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:28,104 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:06:28,104 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:06:28,105 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 05:06:28,105 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 05:06:28,105 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:108, output treesize:93 [2021-11-03 05:06:28,108 INFO L180 QuantifierPusher]: treesize reduction 16, result has 87.0 percent of original size [2021-11-03 05:06:28,110 INFO L185 QuantifierPusher]: treesize reduction 5, result has 94.8 percent of original size 91 [2021-11-03 05:06:28,111 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:28,115 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:28,119 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:28,129 INFO L180 QuantifierPusher]: treesize reduction 6, result has 97.7 percent of original size [2021-11-03 05:06:28,131 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 249 [2021-11-03 05:06:28,134 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:28,145 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:28,146 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:28,146 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:28,146 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:28,147 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:28,148 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:28,150 INFO L180 QuantifierPusher]: treesize reduction 24, result has 70.7 percent of original size [2021-11-03 05:06:28,151 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 49 [2021-11-03 05:06:28,153 INFO L180 QuantifierPusher]: treesize reduction 25, result has 71.9 percent of original size [2021-11-03 05:06:28,154 INFO L185 QuantifierPusher]: treesize reduction 5, result has 90.6 percent of original size 48 [2021-11-03 05:06:28,156 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:28,158 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:28,161 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:28,166 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:06:28,167 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 120 [2021-11-03 05:06:28,169 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:28,174 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:28,175 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:28,175 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:28,176 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:28,176 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:28,177 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:28,179 INFO L180 QuantifierPusher]: treesize reduction 24, result has 71.8 percent of original size [2021-11-03 05:06:28,180 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 52 [2021-11-03 05:06:28,183 INFO L180 QuantifierPusher]: treesize reduction 25, result has 78.6 percent of original size [2021-11-03 05:06:28,184 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 87 [2021-11-03 05:06:28,185 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:28,189 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:28,190 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:28,190 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:28,190 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:28,191 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:28,194 INFO L180 QuantifierPusher]: treesize reduction 24, result has 78.2 percent of original size [2021-11-03 05:06:28,195 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 80 [2021-11-03 05:06:28,198 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 05:06:28,904 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 05:06:28,904 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 05:06:28,904 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 53 [2021-11-03 05:06:28,904 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1377706947] [2021-11-03 05:06:28,904 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 54 states [2021-11-03 05:06:28,904 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:06:28,905 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2021-11-03 05:06:28,905 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=540, Invalid=3242, Unknown=0, NotChecked=0, Total=3782 [2021-11-03 05:06:28,905 INFO L87 Difference]: Start difference. First operand 70 states and 84 transitions. Second operand has 54 states, 54 states have (on average 2.0925925925925926) internal successors, (113), 53 states have internal predecessors, (113), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:06:30,848 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:06:30,848 INFO L93 Difference]: Finished difference Result 366 states and 386 transitions. [2021-11-03 05:06:30,849 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2021-11-03 05:06:30,849 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 54 states have (on average 2.0925925925925926) internal successors, (113), 53 states have internal predecessors, (113), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 56 [2021-11-03 05:06:30,849 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:06:30,850 INFO L225 Difference]: With dead ends: 366 [2021-11-03 05:06:30,850 INFO L226 Difference]: Without dead ends: 324 [2021-11-03 05:06:30,851 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 252 GetRequests, 134 SyntacticMatches, 0 SemanticMatches, 118 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5001 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=2186, Invalid=12094, Unknown=0, NotChecked=0, Total=14280 [2021-11-03 05:06:30,851 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 324 states. [2021-11-03 05:06:30,997 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 324 to 70. [2021-11-03 05:06:30,997 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 69 states have (on average 1.2173913043478262) internal successors, (84), 69 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) [2021-11-03 05:06:30,997 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 84 transitions. [2021-11-03 05:06:30,997 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 84 transitions. Word has length 56 [2021-11-03 05:06:30,998 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:06:30,998 INFO L470 AbstractCegarLoop]: Abstraction has 70 states and 84 transitions. [2021-11-03 05:06:30,998 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 54 states, 54 states have (on average 2.0925925925925926) internal successors, (113), 53 states have internal predecessors, (113), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:06:30,998 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 84 transitions. [2021-11-03 05:06:30,998 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-11-03 05:06:30,998 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:06:30,999 INFO L513 BasicCegarLoop]: trace histogram [13, 12, 12, 7, 5, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:06:31,030 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (95)] Forceful destruction successful, exit code 0 [2021-11-03 05:06:31,200 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 95 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2501 [2021-11-03 05:06:31,201 INFO L402 AbstractCegarLoop]: === Iteration 96 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:06:31,201 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:06:31,201 INFO L85 PathProgramCache]: Analyzing trace with hash 2022496988, now seen corresponding path program 60 times [2021-11-03 05:06:31,201 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:06:31,201 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1732385835] [2021-11-03 05:06:31,201 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:06:31,201 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:06:31,233 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:06:31,494 INFO L134 CoverageAnalysis]: Checked inductivity of 265 backedges. 188 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:06:31,494 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:06:31,494 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1732385835] [2021-11-03 05:06:31,495 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1732385835] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 05:06:31,495 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [326423289] [2021-11-03 05:06:31,495 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-03 05:06:31,495 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:06:31,495 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 05:06:31,522 INFO L229 MonitoredProcess]: Starting monitored process 96 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 05:06:31,537 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (96)] Waiting until timeout for monitored process [2021-11-03 05:06:34,898 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-03 05:06:34,898 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 05:06:34,899 INFO L263 TraceCheckSpWp]: Trace formula consists of 231 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-03 05:06:34,900 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:06:35,647 INFO L134 CoverageAnalysis]: Checked inductivity of 265 backedges. 222 proven. 43 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:06:35,647 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:06:35,813 INFO L134 CoverageAnalysis]: Checked inductivity of 265 backedges. 222 proven. 43 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:06:35,814 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [326423289] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 05:06:35,814 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1412729535] [2021-11-03 05:06:35,814 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-03 05:06:35,814 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 05:06:35,815 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 05:06:35,815 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 05:06:35,815 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 05:06:35,816 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:06:35,817 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:06:35,817 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:06:35,817 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 05:06:35,817 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:06:35,818 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:06:35,818 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 05:06:35,819 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 111 [2021-11-03 05:06:35,820 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_101|], 10=[|v_#valid_102|]} [2021-11-03 05:06:35,824 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:06:35,824 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 [2021-11-03 05:06:35,825 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:06:35,825 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:06:35,825 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:06:35,825 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:06:35,826 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 05:06:35,826 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:35,827 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:06:35,829 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:06:35,830 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:06:35,831 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:06:35,838 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:06:35,839 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 [2021-11-03 05:06:35,839 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:06:35,840 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:06:35,840 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:06:35,841 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:06:35,841 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 05:06:35,841 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:35,842 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:06:35,843 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:06:35,843 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 05:06:35,844 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 05:06:35,844 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:108, output treesize:93 [2021-11-03 05:06:35,847 INFO L180 QuantifierPusher]: treesize reduction 16, result has 87.0 percent of original size [2021-11-03 05:06:35,848 INFO L185 QuantifierPusher]: treesize reduction 5, result has 94.8 percent of original size 91 [2021-11-03 05:06:35,850 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:35,853 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:35,857 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:35,867 INFO L180 QuantifierPusher]: treesize reduction 6, result has 97.7 percent of original size [2021-11-03 05:06:35,870 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 249 [2021-11-03 05:06:35,872 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:35,884 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:35,884 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:35,885 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:35,885 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:35,885 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:35,887 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:35,889 INFO L180 QuantifierPusher]: treesize reduction 24, result has 70.7 percent of original size [2021-11-03 05:06:35,890 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 49 [2021-11-03 05:06:35,892 INFO L180 QuantifierPusher]: treesize reduction 25, result has 71.9 percent of original size [2021-11-03 05:06:35,893 INFO L185 QuantifierPusher]: treesize reduction 5, result has 90.6 percent of original size 48 [2021-11-03 05:06:35,894 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:35,897 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:35,900 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:35,905 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:06:35,906 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 120 [2021-11-03 05:06:35,908 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:35,913 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:35,914 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:35,914 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:35,914 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:35,915 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:35,916 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:35,918 INFO L180 QuantifierPusher]: treesize reduction 24, result has 71.8 percent of original size [2021-11-03 05:06:35,919 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 52 [2021-11-03 05:06:35,934 INFO L180 QuantifierPusher]: treesize reduction 25, result has 78.6 percent of original size [2021-11-03 05:06:35,936 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 87 [2021-11-03 05:06:35,938 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:35,942 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:35,942 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:35,943 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:35,943 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:35,944 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:35,947 INFO L180 QuantifierPusher]: treesize reduction 24, result has 78.2 percent of original size [2021-11-03 05:06:35,948 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 80 [2021-11-03 05:06:35,951 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 05:06:36,657 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 05:06:36,657 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 05:06:36,657 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 52 [2021-11-03 05:06:36,657 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2128102686] [2021-11-03 05:06:36,657 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2021-11-03 05:06:36,657 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:06:36,658 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2021-11-03 05:06:36,658 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=519, Invalid=3141, Unknown=0, NotChecked=0, Total=3660 [2021-11-03 05:06:36,658 INFO L87 Difference]: Start difference. First operand 70 states and 84 transitions. Second operand has 53 states, 53 states have (on average 2.1132075471698113) internal successors, (112), 52 states have internal predecessors, (112), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:06:38,801 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:06:38,801 INFO L93 Difference]: Finished difference Result 414 states and 435 transitions. [2021-11-03 05:06:38,801 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2021-11-03 05:06:38,802 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 53 states have (on average 2.1132075471698113) internal successors, (112), 52 states have internal predecessors, (112), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 56 [2021-11-03 05:06:38,802 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:06:38,803 INFO L225 Difference]: With dead ends: 414 [2021-11-03 05:06:38,803 INFO L226 Difference]: Without dead ends: 372 [2021-11-03 05:06:38,804 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 255 GetRequests, 135 SyntacticMatches, 0 SemanticMatches, 120 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5164 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=2264, Invalid=12498, Unknown=0, NotChecked=0, Total=14762 [2021-11-03 05:06:38,804 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 372 states. [2021-11-03 05:06:38,951 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 372 to 70. [2021-11-03 05:06:38,951 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 69 states have (on average 1.2173913043478262) internal successors, (84), 69 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) [2021-11-03 05:06:38,952 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 84 transitions. [2021-11-03 05:06:38,952 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 84 transitions. Word has length 56 [2021-11-03 05:06:38,952 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:06:38,952 INFO L470 AbstractCegarLoop]: Abstraction has 70 states and 84 transitions. [2021-11-03 05:06:38,952 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 53 states, 53 states have (on average 2.1132075471698113) internal successors, (112), 52 states have internal predecessors, (112), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:06:38,952 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 84 transitions. [2021-11-03 05:06:38,953 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-11-03 05:06:38,953 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:06:38,953 INFO L513 BasicCegarLoop]: trace histogram [13, 12, 12, 6, 6, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:06:38,983 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (96)] Ended with exit code 0 [2021-11-03 05:06:39,153 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 96 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2530 [2021-11-03 05:06:39,153 INFO L402 AbstractCegarLoop]: === Iteration 97 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:06:39,153 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:06:39,154 INFO L85 PathProgramCache]: Analyzing trace with hash 987935531, now seen corresponding path program 61 times [2021-11-03 05:06:39,154 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:06:39,154 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1286711129] [2021-11-03 05:06:39,154 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:06:39,154 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:06:39,184 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:06:39,445 INFO L134 CoverageAnalysis]: Checked inductivity of 264 backedges. 188 proven. 76 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:06:39,445 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:06:39,446 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1286711129] [2021-11-03 05:06:39,446 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1286711129] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 05:06:39,446 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1969620658] [2021-11-03 05:06:39,446 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-03 05:06:39,446 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:06:39,446 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 05:06:39,447 INFO L229 MonitoredProcess]: Starting monitored process 97 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 05:06:39,447 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (97)] Waiting until timeout for monitored process [2021-11-03 05:06:42,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:06:42,872 INFO L263 TraceCheckSpWp]: Trace formula consists of 231 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-03 05:06:42,873 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:06:43,603 INFO L134 CoverageAnalysis]: Checked inductivity of 264 backedges. 222 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:06:43,603 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:06:43,771 INFO L134 CoverageAnalysis]: Checked inductivity of 264 backedges. 222 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:06:43,771 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1969620658] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 05:06:43,771 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2075839340] [2021-11-03 05:06:43,772 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-03 05:06:43,772 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 05:06:43,772 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 05:06:43,772 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 05:06:43,772 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 05:06:43,790 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:06:43,790 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:06:43,791 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:06:43,791 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 05:06:43,791 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:06:43,792 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:06:43,792 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 05:06:43,793 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 111 [2021-11-03 05:06:43,795 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_102|], 10=[|v_#valid_103|]} [2021-11-03 05:06:43,800 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:06:43,801 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 [2021-11-03 05:06:43,802 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:06:43,802 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:06:43,802 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:06:43,803 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:06:43,803 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 05:06:43,803 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:43,805 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:06:43,808 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:06:43,809 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:06:43,810 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:06:43,814 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:06:43,815 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 [2021-11-03 05:06:43,815 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:06:43,817 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:06:43,817 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:06:43,818 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:06:43,818 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 05:06:43,818 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:43,820 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:06:43,821 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:06:43,822 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 05:06:43,823 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 05:06:43,823 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:108, output treesize:93 [2021-11-03 05:06:43,828 INFO L180 QuantifierPusher]: treesize reduction 16, result has 87.0 percent of original size [2021-11-03 05:06:43,829 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 100 [2021-11-03 05:06:43,831 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:43,837 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:43,843 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:43,857 INFO L180 QuantifierPusher]: treesize reduction 11, result has 95.8 percent of original size [2021-11-03 05:06:43,861 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 251 [2021-11-03 05:06:43,865 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:43,881 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:43,882 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:43,882 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:43,883 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:43,883 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:43,885 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:43,888 INFO L180 QuantifierPusher]: treesize reduction 24, result has 70.7 percent of original size [2021-11-03 05:06:43,890 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 49 [2021-11-03 05:06:43,893 INFO L180 QuantifierPusher]: treesize reduction 25, result has 71.9 percent of original size [2021-11-03 05:06:43,894 INFO L185 QuantifierPusher]: treesize reduction 5, result has 90.6 percent of original size 48 [2021-11-03 05:06:43,896 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:43,900 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:43,904 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:43,911 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:06:43,914 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 120 [2021-11-03 05:06:43,916 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:43,924 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:43,925 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:43,926 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:43,926 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:43,927 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:43,928 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:43,932 INFO L180 QuantifierPusher]: treesize reduction 24, result has 71.8 percent of original size [2021-11-03 05:06:43,933 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 52 [2021-11-03 05:06:43,938 INFO L180 QuantifierPusher]: treesize reduction 25, result has 78.6 percent of original size [2021-11-03 05:06:43,939 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 90 [2021-11-03 05:06:43,941 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:43,944 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:43,945 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:43,945 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:43,946 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:43,947 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:43,949 INFO L180 QuantifierPusher]: treesize reduction 24, result has 78.2 percent of original size [2021-11-03 05:06:43,950 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 80 [2021-11-03 05:06:43,954 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 05:06:44,655 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 05:06:44,655 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 05:06:44,655 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 51 [2021-11-03 05:06:44,655 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1647591795] [2021-11-03 05:06:44,656 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2021-11-03 05:06:44,656 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:06:44,656 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2021-11-03 05:06:44,657 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=502, Invalid=3038, Unknown=0, NotChecked=0, Total=3540 [2021-11-03 05:06:44,657 INFO L87 Difference]: Start difference. First operand 70 states and 84 transitions. Second operand has 52 states, 52 states have (on average 2.1346153846153846) internal successors, (111), 51 states have internal predecessors, (111), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:06:46,934 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:06:46,934 INFO L93 Difference]: Finished difference Result 461 states and 483 transitions. [2021-11-03 05:06:46,934 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2021-11-03 05:06:46,934 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 52 states have (on average 2.1346153846153846) internal successors, (111), 51 states have internal predecessors, (111), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 56 [2021-11-03 05:06:46,934 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:06:46,935 INFO L225 Difference]: With dead ends: 461 [2021-11-03 05:06:46,936 INFO L226 Difference]: Without dead ends: 419 [2021-11-03 05:06:46,937 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 256 GetRequests, 136 SyntacticMatches, 0 SemanticMatches, 120 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5142 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=2264, Invalid=12498, Unknown=0, NotChecked=0, Total=14762 [2021-11-03 05:06:46,937 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 419 states. [2021-11-03 05:06:47,092 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 419 to 70. [2021-11-03 05:06:47,092 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 69 states have (on average 1.2173913043478262) internal successors, (84), 69 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) [2021-11-03 05:06:47,093 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 84 transitions. [2021-11-03 05:06:47,093 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 84 transitions. Word has length 56 [2021-11-03 05:06:47,093 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:06:47,093 INFO L470 AbstractCegarLoop]: Abstraction has 70 states and 84 transitions. [2021-11-03 05:06:47,093 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 52 states, 52 states have (on average 2.1346153846153846) internal successors, (111), 51 states have internal predecessors, (111), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:06:47,093 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 84 transitions. [2021-11-03 05:06:47,093 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-11-03 05:06:47,093 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:06:47,093 INFO L513 BasicCegarLoop]: trace histogram [13, 12, 12, 7, 5, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:06:47,125 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (97)] Ended with exit code 0 [2021-11-03 05:06:47,294 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2559,97 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:06:47,294 INFO L402 AbstractCegarLoop]: === Iteration 98 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:06:47,294 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:06:47,294 INFO L85 PathProgramCache]: Analyzing trace with hash 123278588, now seen corresponding path program 62 times [2021-11-03 05:06:47,294 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:06:47,294 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1334476693] [2021-11-03 05:06:47,294 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:06:47,295 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:06:47,325 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:06:47,585 INFO L134 CoverageAnalysis]: Checked inductivity of 265 backedges. 188 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:06:47,585 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:06:47,585 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1334476693] [2021-11-03 05:06:47,585 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1334476693] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 05:06:47,585 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [420892227] [2021-11-03 05:06:47,585 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-03 05:06:47,585 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:06:47,585 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 05:06:47,586 INFO L229 MonitoredProcess]: Starting monitored process 98 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 05:06:47,587 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (98)] Waiting until timeout for monitored process [2021-11-03 05:06:51,085 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 13 check-sat command(s) [2021-11-03 05:06:51,085 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 05:06:51,086 INFO L263 TraceCheckSpWp]: Trace formula consists of 231 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-03 05:06:51,087 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:06:51,861 INFO L134 CoverageAnalysis]: Checked inductivity of 265 backedges. 222 proven. 43 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:06:51,861 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:06:52,027 INFO L134 CoverageAnalysis]: Checked inductivity of 265 backedges. 222 proven. 43 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:06:52,028 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [420892227] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 05:06:52,028 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1413933832] [2021-11-03 05:06:52,028 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-03 05:06:52,028 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 05:06:52,029 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 05:06:52,029 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 05:06:52,029 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 05:06:52,030 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:06:52,031 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:06:52,031 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:06:52,031 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 05:06:52,031 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:06:52,032 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:06:52,032 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 05:06:52,033 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 111 [2021-11-03 05:06:52,036 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_103|], 10=[|v_#valid_104|]} [2021-11-03 05:06:52,040 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:06:52,040 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 [2021-11-03 05:06:52,041 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:06:52,041 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:06:52,041 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:06:52,042 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:06:52,042 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 05:06:52,042 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:52,043 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:06:52,045 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:06:52,046 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:06:52,047 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:06:52,049 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:06:52,050 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 [2021-11-03 05:06:52,051 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:06:52,052 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:06:52,052 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:06:52,052 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:06:52,052 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 05:06:52,053 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:52,054 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:06:52,055 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:06:52,055 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 05:06:52,055 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 05:06:52,055 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:108, output treesize:93 [2021-11-03 05:06:52,059 INFO L180 QuantifierPusher]: treesize reduction 16, result has 87.0 percent of original size [2021-11-03 05:06:52,060 INFO L185 QuantifierPusher]: treesize reduction 7, result has 92.9 percent of original size 91 [2021-11-03 05:06:52,061 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:52,065 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:52,069 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:52,078 INFO L180 QuantifierPusher]: treesize reduction 6, result has 97.7 percent of original size [2021-11-03 05:06:52,081 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 249 [2021-11-03 05:06:52,083 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:52,095 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:52,095 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:52,096 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:52,096 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:52,096 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:52,098 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:52,100 INFO L180 QuantifierPusher]: treesize reduction 24, result has 70.7 percent of original size [2021-11-03 05:06:52,101 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 49 [2021-11-03 05:06:52,103 INFO L180 QuantifierPusher]: treesize reduction 25, result has 71.9 percent of original size [2021-11-03 05:06:52,104 INFO L185 QuantifierPusher]: treesize reduction 5, result has 90.6 percent of original size 48 [2021-11-03 05:06:52,105 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:52,108 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:52,110 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:52,115 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:06:52,117 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 120 [2021-11-03 05:06:52,119 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:52,124 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:52,124 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:52,125 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:52,125 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:52,126 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:52,127 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:52,129 INFO L180 QuantifierPusher]: treesize reduction 24, result has 71.8 percent of original size [2021-11-03 05:06:52,130 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 52 [2021-11-03 05:06:52,133 INFO L180 QuantifierPusher]: treesize reduction 25, result has 78.6 percent of original size [2021-11-03 05:06:52,134 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 90 [2021-11-03 05:06:52,135 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:52,139 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:52,139 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:52,140 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:52,140 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:52,141 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:06:52,144 INFO L180 QuantifierPusher]: treesize reduction 24, result has 78.2 percent of original size [2021-11-03 05:06:52,145 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 80 [2021-11-03 05:06:52,148 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 05:06:52,847 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 05:06:52,847 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 05:06:52,848 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 50 [2021-11-03 05:06:52,848 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [737285108] [2021-11-03 05:06:52,848 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2021-11-03 05:06:52,848 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:06:52,848 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2021-11-03 05:06:52,849 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=489, Invalid=2933, Unknown=0, NotChecked=0, Total=3422 [2021-11-03 05:06:52,849 INFO L87 Difference]: Start difference. First operand 70 states and 84 transitions. Second operand has 51 states, 51 states have (on average 2.156862745098039) internal successors, (110), 50 states have internal predecessors, (110), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:06:55,170 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:06:55,170 INFO L93 Difference]: Finished difference Result 507 states and 530 transitions. [2021-11-03 05:06:55,170 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2021-11-03 05:06:55,171 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 2.156862745098039) internal successors, (110), 50 states have internal predecessors, (110), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 56 [2021-11-03 05:06:55,171 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:06:55,172 INFO L225 Difference]: With dead ends: 507 [2021-11-03 05:06:55,172 INFO L226 Difference]: Without dead ends: 465 [2021-11-03 05:06:55,173 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 255 GetRequests, 137 SyntacticMatches, 0 SemanticMatches, 118 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4932 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=2186, Invalid=12094, Unknown=0, NotChecked=0, Total=14280 [2021-11-03 05:06:55,173 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 465 states. [2021-11-03 05:06:55,325 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 465 to 70. [2021-11-03 05:06:55,325 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 69 states have (on average 1.2173913043478262) internal successors, (84), 69 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) [2021-11-03 05:06:55,326 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 84 transitions. [2021-11-03 05:06:55,326 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 84 transitions. Word has length 56 [2021-11-03 05:06:55,326 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:06:55,326 INFO L470 AbstractCegarLoop]: Abstraction has 70 states and 84 transitions. [2021-11-03 05:06:55,326 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 51 states have (on average 2.156862745098039) internal successors, (110), 50 states have internal predecessors, (110), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:06:55,326 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 84 transitions. [2021-11-03 05:06:55,326 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-11-03 05:06:55,326 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:06:55,326 INFO L513 BasicCegarLoop]: trace histogram [13, 12, 12, 8, 4, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:06:55,358 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (98)] Ended with exit code 0 [2021-11-03 05:06:55,527 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2588,98 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:06:55,527 INFO L402 AbstractCegarLoop]: === Iteration 99 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:06:55,527 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:06:55,527 INFO L85 PathProgramCache]: Analyzing trace with hash -1567181557, now seen corresponding path program 63 times [2021-11-03 05:06:55,527 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:06:55,527 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [978421946] [2021-11-03 05:06:55,527 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:06:55,528 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:06:55,557 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:06:55,825 INFO L134 CoverageAnalysis]: Checked inductivity of 268 backedges. 188 proven. 80 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:06:55,825 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:06:55,825 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [978421946] [2021-11-03 05:06:55,825 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [978421946] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 05:06:55,825 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [839261503] [2021-11-03 05:06:55,826 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-03 05:06:55,826 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:06:55,826 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 05:06:55,826 INFO L229 MonitoredProcess]: Starting monitored process 99 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 05:06:55,827 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (99)] Waiting until timeout for monitored process [2021-11-03 05:06:59,382 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-03 05:06:59,382 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 05:06:59,384 INFO L263 TraceCheckSpWp]: Trace formula consists of 231 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-03 05:06:59,384 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:07:00,083 INFO L134 CoverageAnalysis]: Checked inductivity of 268 backedges. 222 proven. 46 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:07:00,083 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:07:00,246 INFO L134 CoverageAnalysis]: Checked inductivity of 268 backedges. 222 proven. 46 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:07:00,246 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [839261503] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 05:07:00,247 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2041038569] [2021-11-03 05:07:00,247 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-03 05:07:00,248 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 05:07:00,248 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 05:07:00,248 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 05:07:00,248 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 05:07:00,250 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:07:00,250 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:07:00,250 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:07:00,250 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 05:07:00,251 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:07:00,251 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:07:00,251 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 05:07:00,252 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 111 [2021-11-03 05:07:00,253 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_104|], 10=[|v_#valid_105|]} [2021-11-03 05:07:00,257 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:07:00,258 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 [2021-11-03 05:07:00,258 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:07:00,258 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:07:00,259 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:07:00,259 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:07:00,259 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 05:07:00,259 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:00,260 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:07:00,263 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:07:00,263 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:07:00,264 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:07:00,267 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:07:00,267 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 [2021-11-03 05:07:00,268 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:07:00,269 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:07:00,269 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:07:00,269 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:07:00,270 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 05:07:00,270 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:00,271 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:07:00,272 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:07:00,272 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 05:07:00,272 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 05:07:00,273 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:108, output treesize:93 [2021-11-03 05:07:00,276 INFO L180 QuantifierPusher]: treesize reduction 16, result has 87.0 percent of original size [2021-11-03 05:07:00,277 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 100 [2021-11-03 05:07:00,278 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:00,282 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:00,286 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:00,301 INFO L180 QuantifierPusher]: treesize reduction 11, result has 95.8 percent of original size [2021-11-03 05:07:00,305 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 251 [2021-11-03 05:07:00,309 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:00,324 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:00,325 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:00,325 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:00,326 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:00,326 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:00,327 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:00,329 INFO L180 QuantifierPusher]: treesize reduction 24, result has 70.7 percent of original size [2021-11-03 05:07:00,330 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 49 [2021-11-03 05:07:00,334 INFO L180 QuantifierPusher]: treesize reduction 25, result has 71.9 percent of original size [2021-11-03 05:07:00,335 INFO L185 QuantifierPusher]: treesize reduction 5, result has 90.6 percent of original size 48 [2021-11-03 05:07:00,336 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:00,339 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:00,341 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:00,346 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:07:00,348 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 120 [2021-11-03 05:07:00,350 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:00,355 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:00,356 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:00,356 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:00,356 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:00,357 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:00,358 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:00,360 INFO L180 QuantifierPusher]: treesize reduction 24, result has 71.8 percent of original size [2021-11-03 05:07:00,361 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 52 [2021-11-03 05:07:00,364 INFO L180 QuantifierPusher]: treesize reduction 25, result has 78.6 percent of original size [2021-11-03 05:07:00,365 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 87 [2021-11-03 05:07:00,367 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:00,370 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:00,371 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:00,371 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:00,372 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:00,373 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:00,375 INFO L180 QuantifierPusher]: treesize reduction 24, result has 78.2 percent of original size [2021-11-03 05:07:00,376 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 80 [2021-11-03 05:07:00,380 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 05:07:01,089 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 05:07:01,089 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 05:07:01,089 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 49 [2021-11-03 05:07:01,090 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1019517582] [2021-11-03 05:07:01,090 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2021-11-03 05:07:01,090 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:07:01,090 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-11-03 05:07:01,090 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=480, Invalid=2826, Unknown=0, NotChecked=0, Total=3306 [2021-11-03 05:07:01,091 INFO L87 Difference]: Start difference. First operand 70 states and 84 transitions. Second operand has 50 states, 50 states have (on average 2.18) internal successors, (109), 49 states have internal predecessors, (109), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:07:03,564 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:07:03,564 INFO L93 Difference]: Finished difference Result 552 states and 576 transitions. [2021-11-03 05:07:03,564 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2021-11-03 05:07:03,565 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 2.18) internal successors, (109), 49 states have internal predecessors, (109), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 56 [2021-11-03 05:07:03,565 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:07:03,567 INFO L225 Difference]: With dead ends: 552 [2021-11-03 05:07:03,567 INFO L226 Difference]: Without dead ends: 510 [2021-11-03 05:07:03,568 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 252 GetRequests, 138 SyntacticMatches, 0 SemanticMatches, 114 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4543 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=2036, Invalid=11304, Unknown=0, NotChecked=0, Total=13340 [2021-11-03 05:07:03,568 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 510 states. [2021-11-03 05:07:03,733 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 510 to 70. [2021-11-03 05:07:03,734 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 69 states have (on average 1.2173913043478262) internal successors, (84), 69 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) [2021-11-03 05:07:03,734 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 84 transitions. [2021-11-03 05:07:03,734 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 84 transitions. Word has length 56 [2021-11-03 05:07:03,734 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:07:03,734 INFO L470 AbstractCegarLoop]: Abstraction has 70 states and 84 transitions. [2021-11-03 05:07:03,734 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 50 states have (on average 2.18) internal successors, (109), 49 states have internal predecessors, (109), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:07:03,734 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 84 transitions. [2021-11-03 05:07:03,734 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-11-03 05:07:03,735 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:07:03,735 INFO L513 BasicCegarLoop]: trace histogram [13, 12, 12, 9, 3, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:07:03,767 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (99)] Forceful destruction successful, exit code 0 [2021-11-03 05:07:03,935 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2617,99 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:07:03,935 INFO L402 AbstractCegarLoop]: === Iteration 100 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:07:03,935 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:07:03,935 INFO L85 PathProgramCache]: Analyzing trace with hash -97691876, now seen corresponding path program 64 times [2021-11-03 05:07:03,936 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:07:03,936 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [443370260] [2021-11-03 05:07:03,936 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:07:03,936 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:07:03,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:07:04,231 INFO L134 CoverageAnalysis]: Checked inductivity of 273 backedges. 188 proven. 85 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:07:04,231 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:07:04,231 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [443370260] [2021-11-03 05:07:04,231 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [443370260] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 05:07:04,232 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [525905028] [2021-11-03 05:07:04,232 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-03 05:07:04,232 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:07:04,232 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 05:07:04,232 INFO L229 MonitoredProcess]: Starting monitored process 100 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 05:07:04,234 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (100)] Waiting until timeout for monitored process [2021-11-03 05:07:07,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:07:07,899 INFO L263 TraceCheckSpWp]: Trace formula consists of 231 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-03 05:07:07,899 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:07:08,578 INFO L134 CoverageAnalysis]: Checked inductivity of 273 backedges. 222 proven. 51 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:07:08,578 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:07:08,744 INFO L134 CoverageAnalysis]: Checked inductivity of 273 backedges. 222 proven. 51 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:07:08,745 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [525905028] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 05:07:08,745 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2130060098] [2021-11-03 05:07:08,745 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-03 05:07:08,745 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 05:07:08,746 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 05:07:08,746 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 05:07:08,746 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 05:07:08,747 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:07:08,748 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:07:08,748 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:07:08,748 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 05:07:08,748 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:07:08,749 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:07:08,749 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 05:07:08,749 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 111 [2021-11-03 05:07:08,751 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_105|], 10=[|v_#valid_106|]} [2021-11-03 05:07:08,755 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:07:08,755 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 [2021-11-03 05:07:08,755 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:07:08,756 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:07:08,756 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:07:08,756 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:07:08,756 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 05:07:08,757 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:08,758 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:07:08,760 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:07:08,761 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:07:08,762 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:07:08,767 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:07:08,767 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 [2021-11-03 05:07:08,768 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:07:08,769 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:07:08,769 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:07:08,769 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:07:08,769 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 05:07:08,769 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:08,771 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:07:08,771 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:07:08,772 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 05:07:08,772 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 05:07:08,772 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:108, output treesize:93 [2021-11-03 05:07:08,775 INFO L180 QuantifierPusher]: treesize reduction 16, result has 87.0 percent of original size [2021-11-03 05:07:08,777 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 100 [2021-11-03 05:07:08,778 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:08,782 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:08,786 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:08,795 INFO L180 QuantifierPusher]: treesize reduction 11, result has 95.8 percent of original size [2021-11-03 05:07:08,797 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 251 [2021-11-03 05:07:08,800 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:08,810 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:08,811 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:08,811 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:08,812 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:08,812 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:08,813 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:08,815 INFO L180 QuantifierPusher]: treesize reduction 24, result has 70.7 percent of original size [2021-11-03 05:07:08,816 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 49 [2021-11-03 05:07:08,819 INFO L180 QuantifierPusher]: treesize reduction 25, result has 71.9 percent of original size [2021-11-03 05:07:08,820 INFO L185 QuantifierPusher]: treesize reduction 5, result has 90.6 percent of original size 48 [2021-11-03 05:07:08,821 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:08,824 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:08,827 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:08,832 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:07:08,833 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 120 [2021-11-03 05:07:08,835 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:08,840 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:08,841 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:08,841 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:08,841 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:08,842 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:08,843 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:08,845 INFO L180 QuantifierPusher]: treesize reduction 24, result has 71.8 percent of original size [2021-11-03 05:07:08,846 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 52 [2021-11-03 05:07:08,849 INFO L180 QuantifierPusher]: treesize reduction 25, result has 78.6 percent of original size [2021-11-03 05:07:08,850 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 90 [2021-11-03 05:07:08,851 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:08,855 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:08,855 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:08,856 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:08,856 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:08,857 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:08,860 INFO L180 QuantifierPusher]: treesize reduction 24, result has 78.2 percent of original size [2021-11-03 05:07:08,861 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 80 [2021-11-03 05:07:08,864 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 05:07:09,568 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 05:07:09,568 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 05:07:09,568 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 48 [2021-11-03 05:07:09,568 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [686947399] [2021-11-03 05:07:09,569 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2021-11-03 05:07:09,569 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:07:09,569 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-11-03 05:07:09,569 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=475, Invalid=2717, Unknown=0, NotChecked=0, Total=3192 [2021-11-03 05:07:09,569 INFO L87 Difference]: Start difference. First operand 70 states and 84 transitions. Second operand has 49 states, 49 states have (on average 2.204081632653061) internal successors, (108), 48 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) [2021-11-03 05:07:12,018 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:07:12,018 INFO L93 Difference]: Finished difference Result 596 states and 621 transitions. [2021-11-03 05:07:12,018 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2021-11-03 05:07:12,018 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 2.204081632653061) internal successors, (108), 48 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) Word has length 56 [2021-11-03 05:07:12,018 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:07:12,021 INFO L225 Difference]: With dead ends: 596 [2021-11-03 05:07:12,021 INFO L226 Difference]: Without dead ends: 554 [2021-11-03 05:07:12,022 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 247 GetRequests, 139 SyntacticMatches, 0 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3996 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=1826, Invalid=10164, Unknown=0, NotChecked=0, Total=11990 [2021-11-03 05:07:12,023 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 554 states. [2021-11-03 05:07:12,179 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 554 to 70. [2021-11-03 05:07:12,179 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 69 states have (on average 1.2173913043478262) internal successors, (84), 69 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) [2021-11-03 05:07:12,180 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 84 transitions. [2021-11-03 05:07:12,180 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 84 transitions. Word has length 56 [2021-11-03 05:07:12,180 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:07:12,180 INFO L470 AbstractCegarLoop]: Abstraction has 70 states and 84 transitions. [2021-11-03 05:07:12,180 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 49 states have (on average 2.204081632653061) internal successors, (108), 48 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) [2021-11-03 05:07:12,180 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 84 transitions. [2021-11-03 05:07:12,180 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-11-03 05:07:12,180 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:07:12,180 INFO L513 BasicCegarLoop]: trace histogram [13, 12, 12, 10, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:07:12,212 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (100)] Forceful destruction successful, exit code 0 [2021-11-03 05:07:12,381 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2646,100 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:07:12,381 INFO L402 AbstractCegarLoop]: === Iteration 101 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:07:12,381 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:07:12,381 INFO L85 PathProgramCache]: Analyzing trace with hash -2128498965, now seen corresponding path program 65 times [2021-11-03 05:07:12,381 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:07:12,381 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1242214141] [2021-11-03 05:07:12,381 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:07:12,381 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:07:12,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:07:12,672 INFO L134 CoverageAnalysis]: Checked inductivity of 280 backedges. 188 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:07:12,672 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:07:12,673 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1242214141] [2021-11-03 05:07:12,673 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1242214141] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 05:07:12,673 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [711275753] [2021-11-03 05:07:12,673 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-03 05:07:12,673 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:07:12,673 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 05:07:12,673 INFO L229 MonitoredProcess]: Starting monitored process 101 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 05:07:12,674 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (101)] Waiting until timeout for monitored process [2021-11-03 05:07:16,336 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 13 check-sat command(s) [2021-11-03 05:07:16,336 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 05:07:16,338 INFO L263 TraceCheckSpWp]: Trace formula consists of 231 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-03 05:07:16,339 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:07:17,037 INFO L134 CoverageAnalysis]: Checked inductivity of 280 backedges. 222 proven. 58 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:07:17,038 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:07:17,209 INFO L134 CoverageAnalysis]: Checked inductivity of 280 backedges. 222 proven. 58 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:07:17,209 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [711275753] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 05:07:17,209 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [89250240] [2021-11-03 05:07:17,210 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-03 05:07:17,210 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 05:07:17,210 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 05:07:17,210 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 05:07:17,210 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 05:07:17,212 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:07:17,212 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:07:17,213 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:07:17,213 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 05:07:17,213 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:07:17,213 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:07:17,214 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 05:07:17,214 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 111 [2021-11-03 05:07:17,216 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_106|], 10=[|v_#valid_107|]} [2021-11-03 05:07:17,221 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:07:17,221 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 [2021-11-03 05:07:17,222 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:07:17,222 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:07:17,222 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:07:17,223 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:07:17,223 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 05:07:17,223 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:17,224 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:07:17,226 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:07:17,227 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:07:17,228 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:07:17,231 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:07:17,231 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 [2021-11-03 05:07:17,231 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:07:17,233 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:07:17,233 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:07:17,233 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:07:17,233 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 05:07:17,233 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:17,235 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:07:17,235 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:07:17,236 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 05:07:17,236 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 05:07:17,236 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:108, output treesize:93 [2021-11-03 05:07:17,239 INFO L180 QuantifierPusher]: treesize reduction 16, result has 87.0 percent of original size [2021-11-03 05:07:17,241 INFO L185 QuantifierPusher]: treesize reduction 7, result has 92.9 percent of original size 91 [2021-11-03 05:07:17,242 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:17,246 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:17,250 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:17,259 INFO L180 QuantifierPusher]: treesize reduction 6, result has 97.7 percent of original size [2021-11-03 05:07:17,262 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 249 [2021-11-03 05:07:17,264 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:17,276 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:17,276 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:17,277 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:17,277 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:17,277 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:17,279 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:17,281 INFO L180 QuantifierPusher]: treesize reduction 24, result has 70.7 percent of original size [2021-11-03 05:07:17,282 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 49 [2021-11-03 05:07:17,284 INFO L180 QuantifierPusher]: treesize reduction 25, result has 71.9 percent of original size [2021-11-03 05:07:17,285 INFO L185 QuantifierPusher]: treesize reduction 5, result has 90.6 percent of original size 48 [2021-11-03 05:07:17,286 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:17,289 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:17,292 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:17,297 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:07:17,298 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 120 [2021-11-03 05:07:17,300 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:17,305 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:17,306 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:17,306 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:17,307 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:17,307 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:17,308 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:17,312 INFO L180 QuantifierPusher]: treesize reduction 24, result has 71.8 percent of original size [2021-11-03 05:07:17,313 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 52 [2021-11-03 05:07:17,316 INFO L180 QuantifierPusher]: treesize reduction 25, result has 78.6 percent of original size [2021-11-03 05:07:17,317 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 90 [2021-11-03 05:07:17,319 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:17,322 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:17,323 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:17,323 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:17,324 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:17,325 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:17,394 INFO L180 QuantifierPusher]: treesize reduction 24, result has 78.2 percent of original size [2021-11-03 05:07:17,395 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 80 [2021-11-03 05:07:17,399 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 05:07:18,094 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 05:07:18,094 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 05:07:18,095 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 47 [2021-11-03 05:07:18,095 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1735995534] [2021-11-03 05:07:18,095 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2021-11-03 05:07:18,095 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:07:18,095 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-11-03 05:07:18,095 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=474, Invalid=2606, Unknown=0, NotChecked=0, Total=3080 [2021-11-03 05:07:18,096 INFO L87 Difference]: Start difference. First operand 70 states and 84 transitions. Second operand has 48 states, 48 states have (on average 2.2291666666666665) internal successors, (107), 47 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) [2021-11-03 05:07:20,499 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:07:20,499 INFO L93 Difference]: Finished difference Result 639 states and 665 transitions. [2021-11-03 05:07:20,499 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2021-11-03 05:07:20,499 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 2.2291666666666665) internal successors, (107), 47 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 56 [2021-11-03 05:07:20,500 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:07:20,500 INFO L225 Difference]: With dead ends: 639 [2021-11-03 05:07:20,501 INFO L226 Difference]: Without dead ends: 597 [2021-11-03 05:07:20,501 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 240 GetRequests, 140 SyntacticMatches, 0 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3324 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=1574, Invalid=8728, Unknown=0, NotChecked=0, Total=10302 [2021-11-03 05:07:20,502 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 597 states. [2021-11-03 05:07:20,672 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 597 to 70. [2021-11-03 05:07:20,672 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 69 states have (on average 1.2173913043478262) internal successors, (84), 69 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) [2021-11-03 05:07:20,672 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 84 transitions. [2021-11-03 05:07:20,672 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 84 transitions. Word has length 56 [2021-11-03 05:07:20,672 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:07:20,672 INFO L470 AbstractCegarLoop]: Abstraction has 70 states and 84 transitions. [2021-11-03 05:07:20,672 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 48 states have (on average 2.2291666666666665) internal successors, (107), 47 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) [2021-11-03 05:07:20,673 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 84 transitions. [2021-11-03 05:07:20,673 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-11-03 05:07:20,673 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:07:20,673 INFO L513 BasicCegarLoop]: trace histogram [13, 12, 12, 11, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:07:20,705 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (101)] Forceful destruction successful, exit code 0 [2021-11-03 05:07:20,873 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 101 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2675 [2021-11-03 05:07:20,873 INFO L402 AbstractCegarLoop]: === Iteration 102 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:07:20,874 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:07:20,874 INFO L85 PathProgramCache]: Analyzing trace with hash 1131127100, now seen corresponding path program 66 times [2021-11-03 05:07:20,874 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:07:20,874 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1012005179] [2021-11-03 05:07:20,874 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:07:20,874 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:07:20,905 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:07:21,172 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 188 proven. 101 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:07:21,172 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:07:21,172 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1012005179] [2021-11-03 05:07:21,172 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1012005179] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 05:07:21,172 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1638156482] [2021-11-03 05:07:21,172 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-03 05:07:21,172 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:07:21,173 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 05:07:21,173 INFO L229 MonitoredProcess]: Starting monitored process 102 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 05:07:21,174 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (102)] Waiting until timeout for monitored process [2021-11-03 05:07:24,862 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-03 05:07:24,863 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 05:07:24,864 INFO L263 TraceCheckSpWp]: Trace formula consists of 231 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-03 05:07:24,865 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:07:25,507 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 222 proven. 67 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:07:25,507 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:07:25,670 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 222 proven. 67 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:07:25,670 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1638156482] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 05:07:25,670 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [648964700] [2021-11-03 05:07:25,671 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-03 05:07:25,671 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 05:07:25,671 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 05:07:25,671 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 05:07:25,671 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 05:07:25,674 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:07:25,675 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:07:25,675 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:07:25,675 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 05:07:25,675 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:07:25,676 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:07:25,676 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 05:07:25,677 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 111 [2021-11-03 05:07:25,681 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_107|], 10=[|v_#valid_108|]} [2021-11-03 05:07:25,686 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:07:25,686 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 [2021-11-03 05:07:25,686 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:07:25,686 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:07:25,687 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:07:25,687 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:07:25,687 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 05:07:25,687 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:25,689 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:07:25,691 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:07:25,691 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:07:25,692 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:07:25,694 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:07:25,695 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 [2021-11-03 05:07:25,695 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:07:25,696 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:07:25,697 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:07:25,697 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:07:25,697 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 05:07:25,697 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:25,698 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:07:25,699 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:07:25,699 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 05:07:25,700 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 05:07:25,700 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:108, output treesize:93 [2021-11-03 05:07:25,703 INFO L180 QuantifierPusher]: treesize reduction 16, result has 87.0 percent of original size [2021-11-03 05:07:25,704 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 100 [2021-11-03 05:07:25,705 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:25,709 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:25,713 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:25,722 INFO L180 QuantifierPusher]: treesize reduction 11, result has 95.8 percent of original size [2021-11-03 05:07:25,724 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 251 [2021-11-03 05:07:25,726 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:25,737 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:25,737 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:25,738 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:25,738 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:25,739 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:25,740 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:25,742 INFO L180 QuantifierPusher]: treesize reduction 24, result has 70.7 percent of original size [2021-11-03 05:07:25,742 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 49 [2021-11-03 05:07:25,745 INFO L180 QuantifierPusher]: treesize reduction 25, result has 71.9 percent of original size [2021-11-03 05:07:25,746 INFO L185 QuantifierPusher]: treesize reduction 5, result has 90.6 percent of original size 48 [2021-11-03 05:07:25,747 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:25,749 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:25,752 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:25,757 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:07:25,759 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 120 [2021-11-03 05:07:25,760 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:25,766 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:25,766 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:25,767 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:25,767 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:25,767 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:25,769 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:25,771 INFO L180 QuantifierPusher]: treesize reduction 24, result has 71.8 percent of original size [2021-11-03 05:07:25,772 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 52 [2021-11-03 05:07:25,775 INFO L180 QuantifierPusher]: treesize reduction 25, result has 78.6 percent of original size [2021-11-03 05:07:25,776 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 90 [2021-11-03 05:07:25,777 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:25,781 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:25,781 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:25,782 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:25,782 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:25,783 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:25,786 INFO L180 QuantifierPusher]: treesize reduction 24, result has 78.2 percent of original size [2021-11-03 05:07:25,787 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 80 [2021-11-03 05:07:25,790 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 05:07:26,557 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 05:07:26,557 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 05:07:26,557 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 46 [2021-11-03 05:07:26,557 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [807357237] [2021-11-03 05:07:26,557 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 47 states [2021-11-03 05:07:26,557 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:07:26,557 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2021-11-03 05:07:26,558 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=477, Invalid=2493, Unknown=0, NotChecked=0, Total=2970 [2021-11-03 05:07:26,558 INFO L87 Difference]: Start difference. First operand 70 states and 84 transitions. Second operand has 47 states, 47 states have (on average 2.25531914893617) internal successors, (106), 46 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) [2021-11-03 05:07:28,820 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:07:28,820 INFO L93 Difference]: Finished difference Result 681 states and 708 transitions. [2021-11-03 05:07:28,820 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2021-11-03 05:07:28,820 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 2.25531914893617) internal successors, (106), 46 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 56 [2021-11-03 05:07:28,820 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:07:28,821 INFO L225 Difference]: With dead ends: 681 [2021-11-03 05:07:28,821 INFO L226 Difference]: Without dead ends: 639 [2021-11-03 05:07:28,821 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 231 GetRequests, 141 SyntacticMatches, 0 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2546 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1304, Invalid=7068, Unknown=0, NotChecked=0, Total=8372 [2021-11-03 05:07:28,822 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 639 states. [2021-11-03 05:07:28,983 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 639 to 70. [2021-11-03 05:07:28,984 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 69 states have (on average 1.2173913043478262) internal successors, (84), 69 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) [2021-11-03 05:07:28,984 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 84 transitions. [2021-11-03 05:07:28,984 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 84 transitions. Word has length 56 [2021-11-03 05:07:28,984 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:07:28,984 INFO L470 AbstractCegarLoop]: Abstraction has 70 states and 84 transitions. [2021-11-03 05:07:28,984 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 47 states, 47 states have (on average 2.25531914893617) internal successors, (106), 46 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) [2021-11-03 05:07:28,984 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 84 transitions. [2021-11-03 05:07:28,984 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-11-03 05:07:28,984 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:07:28,984 INFO L513 BasicCegarLoop]: trace histogram [13, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:07:29,016 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (102)] Ended with exit code 0 [2021-11-03 05:07:29,185 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 102 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2704 [2021-11-03 05:07:29,185 INFO L402 AbstractCegarLoop]: === Iteration 103 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:07:29,185 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:07:29,185 INFO L85 PathProgramCache]: Analyzing trace with hash 266445003, now seen corresponding path program 12 times [2021-11-03 05:07:29,185 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:07:29,185 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1096217122] [2021-11-03 05:07:29,185 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:07:29,186 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:07:29,216 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:07:29,479 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 188 proven. 112 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:07:29,479 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:07:29,479 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1096217122] [2021-11-03 05:07:29,479 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1096217122] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 05:07:29,479 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1673790880] [2021-11-03 05:07:29,479 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-03 05:07:29,480 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:07:29,480 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 05:07:29,480 INFO L229 MonitoredProcess]: Starting monitored process 103 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 05:07:29,481 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (103)] Waiting until timeout for monitored process [2021-11-03 05:07:33,243 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-03 05:07:33,243 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 05:07:33,245 INFO L263 TraceCheckSpWp]: Trace formula consists of 231 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-03 05:07:33,246 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:07:33,884 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 222 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:07:33,884 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:07:34,126 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 222 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:07:34,126 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1673790880] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 05:07:34,126 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1797663641] [2021-11-03 05:07:34,127 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-03 05:07:34,127 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 05:07:34,127 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 05:07:34,127 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 05:07:34,128 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 05:07:34,134 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:07:34,134 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:07:34,134 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:07:34,135 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 05:07:34,135 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:07:34,135 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:07:34,135 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 05:07:34,136 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 111 [2021-11-03 05:07:34,137 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_108|], 10=[|v_#valid_109|]} [2021-11-03 05:07:34,141 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:07:34,142 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 [2021-11-03 05:07:34,142 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:07:34,143 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:07:34,143 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:07:34,143 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:07:34,143 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 05:07:34,143 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:34,145 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:07:34,147 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:07:34,148 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:07:34,148 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:07:34,151 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:07:34,151 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 [2021-11-03 05:07:34,152 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:07:34,153 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:07:34,153 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:07:34,153 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:07:34,154 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 05:07:34,154 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:34,155 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:07:34,156 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:07:34,156 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 05:07:34,156 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 05:07:34,157 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:108, output treesize:93 [2021-11-03 05:07:34,160 INFO L180 QuantifierPusher]: treesize reduction 16, result has 87.0 percent of original size [2021-11-03 05:07:34,161 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 102 [2021-11-03 05:07:34,162 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:34,166 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:34,170 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:34,180 INFO L180 QuantifierPusher]: treesize reduction 6, result has 97.7 percent of original size [2021-11-03 05:07:34,182 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 251 [2021-11-03 05:07:34,185 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:34,195 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:34,196 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:34,196 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:34,196 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:34,197 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:34,198 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:34,200 INFO L180 QuantifierPusher]: treesize reduction 24, result has 70.7 percent of original size [2021-11-03 05:07:34,201 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 49 [2021-11-03 05:07:34,205 INFO L180 QuantifierPusher]: treesize reduction 26, result has 78.5 percent of original size [2021-11-03 05:07:34,206 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 90 [2021-11-03 05:07:34,207 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:34,211 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:34,212 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:34,212 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:34,214 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:34,215 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:34,219 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:07:34,221 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 138 [2021-11-03 05:07:34,222 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:34,228 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:34,229 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:34,229 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:34,230 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:34,230 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:34,231 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:34,231 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:34,232 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:34,242 INFO L180 QuantifierPusher]: treesize reduction 30, result has 74.1 percent of original size [2021-11-03 05:07:34,243 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 80 [2021-11-03 05:07:34,246 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 05:07:34,974 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 05:07:34,974 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 05:07:34,975 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 45 [2021-11-03 05:07:34,975 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [755155256] [2021-11-03 05:07:34,975 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2021-11-03 05:07:34,975 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:07:34,976 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-11-03 05:07:34,976 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=483, Invalid=2379, Unknown=0, NotChecked=0, Total=2862 [2021-11-03 05:07:34,976 INFO L87 Difference]: Start difference. First operand 70 states and 84 transitions. Second operand has 46 states, 46 states have (on average 2.260869565217391) internal successors, (104), 45 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) [2021-11-03 05:07:37,164 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:07:37,164 INFO L93 Difference]: Finished difference Result 724 states and 753 transitions. [2021-11-03 05:07:37,164 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-11-03 05:07:37,164 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 2.260869565217391) internal successors, (104), 45 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) Word has length 56 [2021-11-03 05:07:37,164 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:07:37,165 INFO L225 Difference]: With dead ends: 724 [2021-11-03 05:07:37,165 INFO L226 Difference]: Without dead ends: 682 [2021-11-03 05:07:37,166 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 220 GetRequests, 142 SyntacticMatches, 0 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1786 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1058, Invalid=5262, Unknown=0, NotChecked=0, Total=6320 [2021-11-03 05:07:37,166 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 682 states. [2021-11-03 05:07:37,341 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 682 to 71. [2021-11-03 05:07:37,341 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 70 states have (on average 1.2285714285714286) internal successors, (86), 70 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) [2021-11-03 05:07:37,342 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 86 transitions. [2021-11-03 05:07:37,342 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 86 transitions. Word has length 56 [2021-11-03 05:07:37,342 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:07:37,342 INFO L470 AbstractCegarLoop]: Abstraction has 71 states and 86 transitions. [2021-11-03 05:07:37,342 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 46 states have (on average 2.260869565217391) internal successors, (104), 45 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) [2021-11-03 05:07:37,342 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 86 transitions. [2021-11-03 05:07:37,342 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-11-03 05:07:37,342 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:07:37,343 INFO L513 BasicCegarLoop]: trace histogram [13, 13, 12, 12, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:07:37,376 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (103)] Ended with exit code 0 [2021-11-03 05:07:37,545 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 103 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2733 [2021-11-03 05:07:37,545 INFO L402 AbstractCegarLoop]: === Iteration 104 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:07:37,545 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:07:37,545 INFO L85 PathProgramCache]: Analyzing trace with hash 618943759, now seen corresponding path program 24 times [2021-11-03 05:07:37,545 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:07:37,545 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [993197380] [2021-11-03 05:07:37,545 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:07:37,546 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:07:37,592 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:07:37,721 INFO L134 CoverageAnalysis]: Checked inductivity of 313 backedges. 78 proven. 235 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:07:37,722 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:07:37,722 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [993197380] [2021-11-03 05:07:37,722 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [993197380] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 05:07:37,722 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [406526662] [2021-11-03 05:07:37,722 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-03 05:07:37,723 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:07:37,723 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 05:07:37,750 INFO L229 MonitoredProcess]: Starting monitored process 104 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 05:07:37,765 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (104)] Waiting until timeout for monitored process [2021-11-03 05:07:41,586 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-03 05:07:41,586 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 05:07:41,588 INFO L263 TraceCheckSpWp]: Trace formula consists of 236 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-03 05:07:41,588 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:07:41,733 INFO L134 CoverageAnalysis]: Checked inductivity of 313 backedges. 91 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:07:41,733 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:07:41,877 INFO L134 CoverageAnalysis]: Checked inductivity of 313 backedges. 91 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:07:41,877 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [406526662] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 05:07:41,877 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1818497471] [2021-11-03 05:07:41,879 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-03 05:07:41,879 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 05:07:41,879 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 05:07:41,879 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 05:07:41,879 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 05:07:41,881 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:07:41,881 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:07:41,881 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:07:41,882 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 05:07:41,882 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:07:41,882 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:07:41,882 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 05:07:41,883 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 111 [2021-11-03 05:07:41,884 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_109|], 10=[|v_#valid_110|]} [2021-11-03 05:07:41,888 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:07:41,889 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 [2021-11-03 05:07:41,889 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:07:41,889 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:07:41,890 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:07:41,890 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:07:41,890 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 05:07:41,890 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:41,892 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:07:41,894 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:07:41,895 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:07:41,895 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:07:41,898 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:07:41,898 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 [2021-11-03 05:07:41,899 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:07:41,900 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:07:41,900 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:07:41,900 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:07:41,901 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 05:07:41,901 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:41,902 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:07:41,903 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:07:41,903 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 05:07:41,904 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 05:07:41,904 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:108, output treesize:93 [2021-11-03 05:07:41,908 INFO L180 QuantifierPusher]: treesize reduction 17, result has 86.9 percent of original size [2021-11-03 05:07:41,909 INFO L185 QuantifierPusher]: treesize reduction 7, result has 93.3 percent of original size 97 [2021-11-03 05:07:41,911 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:41,915 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:41,920 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:41,930 INFO L180 QuantifierPusher]: treesize reduction 12, result has 95.7 percent of original size [2021-11-03 05:07:41,933 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 267 [2021-11-03 05:07:41,936 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:41,950 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:41,951 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:41,951 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:41,952 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:41,952 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:41,953 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:41,956 INFO L180 QuantifierPusher]: treesize reduction 30, result has 67.0 percent of original size [2021-11-03 05:07:41,957 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 52 [2021-11-03 05:07:41,960 INFO L180 QuantifierPusher]: treesize reduction 31, result has 74.8 percent of original size [2021-11-03 05:07:41,961 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 87 [2021-11-03 05:07:41,963 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:41,966 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:41,967 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:41,968 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:41,968 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:41,969 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:41,973 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:07:41,975 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 138 [2021-11-03 05:07:41,976 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:41,982 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:41,983 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:41,987 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:41,987 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:41,988 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:41,988 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:41,989 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:41,990 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:41,993 INFO L180 QuantifierPusher]: treesize reduction 30, result has 74.1 percent of original size [2021-11-03 05:07:41,994 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 80 [2021-11-03 05:07:41,998 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 05:07:42,616 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 05:07:42,616 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 05:07:42,616 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 18 [2021-11-03 05:07:42,616 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1225347211] [2021-11-03 05:07:42,616 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-11-03 05:07:42,616 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:07:42,617 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-11-03 05:07:42,617 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=164, Invalid=538, Unknown=0, NotChecked=0, Total=702 [2021-11-03 05:07:42,617 INFO L87 Difference]: Start difference. First operand 71 states and 86 transitions. Second operand has 19 states, 19 states have (on average 3.3684210526315788) internal successors, (64), 18 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) [2021-11-03 05:07:43,090 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:07:43,090 INFO L93 Difference]: Finished difference Result 82 states and 97 transitions. [2021-11-03 05:07:43,090 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-11-03 05:07:43,090 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 3.3684210526315788) internal successors, (64), 18 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) Word has length 57 [2021-11-03 05:07:43,090 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:07:43,091 INFO L225 Difference]: With dead ends: 82 [2021-11-03 05:07:43,091 INFO L226 Difference]: Without dead ends: 80 [2021-11-03 05:07:43,091 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 212 GetRequests, 170 SyntacticMatches, 2 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 476 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=437, Invalid=1285, Unknown=0, NotChecked=0, Total=1722 [2021-11-03 05:07:43,091 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2021-11-03 05:07:43,267 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 74. [2021-11-03 05:07:43,267 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 74 states, 73 states have (on average 1.2191780821917808) internal successors, (89), 73 states have internal predecessors, (89), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:07:43,267 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 89 transitions. [2021-11-03 05:07:43,267 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 89 transitions. Word has length 57 [2021-11-03 05:07:43,267 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:07:43,268 INFO L470 AbstractCegarLoop]: Abstraction has 74 states and 89 transitions. [2021-11-03 05:07:43,268 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 3.3684210526315788) internal successors, (64), 18 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) [2021-11-03 05:07:43,268 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 89 transitions. [2021-11-03 05:07:43,268 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-03 05:07:43,268 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:07:43,268 INFO L513 BasicCegarLoop]: trace histogram [14, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:07:43,301 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (104)] Ended with exit code 0 [2021-11-03 05:07:43,473 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 104 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2761 [2021-11-03 05:07:43,473 INFO L402 AbstractCegarLoop]: === Iteration 105 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:07:43,473 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:07:43,473 INFO L85 PathProgramCache]: Analyzing trace with hash 663765761, now seen corresponding path program 25 times [2021-11-03 05:07:43,473 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:07:43,473 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1139645904] [2021-11-03 05:07:43,473 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:07:43,473 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:07:43,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:07:43,890 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 223 proven. 128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:07:43,890 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:07:43,891 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1139645904] [2021-11-03 05:07:43,891 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1139645904] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 05:07:43,891 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [471863600] [2021-11-03 05:07:43,891 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-03 05:07:43,891 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:07:43,891 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 05:07:43,892 INFO L229 MonitoredProcess]: Starting monitored process 105 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 05:07:43,892 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (105)] Waiting until timeout for monitored process [2021-11-03 05:07:47,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:07:47,728 INFO L263 TraceCheckSpWp]: Trace formula consists of 246 conjuncts, 32 conjunts are in the unsatisfiable core [2021-11-03 05:07:47,729 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:07:48,661 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 260 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:07:48,661 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:07:48,842 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 260 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:07:48,842 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [471863600] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 05:07:48,843 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [617439574] [2021-11-03 05:07:48,843 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-03 05:07:48,843 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 05:07:48,843 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 05:07:48,843 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 05:07:48,843 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 05:07:48,845 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:07:48,845 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:07:48,846 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:07:48,846 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 05:07:48,846 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:07:48,846 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:07:48,847 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 05:07:48,847 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 111 [2021-11-03 05:07:48,848 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_110|], 10=[|v_#valid_111|]} [2021-11-03 05:07:48,852 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:07:48,856 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 [2021-11-03 05:07:48,857 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:07:48,857 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:07:48,857 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:07:48,857 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:07:48,857 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 05:07:48,858 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:48,859 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:07:48,861 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:07:48,862 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:07:48,862 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:07:48,875 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:07:48,876 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 [2021-11-03 05:07:48,877 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:07:48,878 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:07:48,878 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:07:48,879 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:07:48,879 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 05:07:48,879 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:48,881 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:07:48,882 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:07:48,883 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 05:07:48,883 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 05:07:48,884 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:108, output treesize:93 [2021-11-03 05:07:48,890 INFO L180 QuantifierPusher]: treesize reduction 17, result has 86.9 percent of original size [2021-11-03 05:07:48,892 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 106 [2021-11-03 05:07:48,894 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:48,900 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:48,906 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:48,916 INFO L180 QuantifierPusher]: treesize reduction 12, result has 95.7 percent of original size [2021-11-03 05:07:48,919 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 269 [2021-11-03 05:07:48,922 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:48,935 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:48,936 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:48,936 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:48,937 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:48,937 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:48,939 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:48,941 INFO L180 QuantifierPusher]: treesize reduction 30, result has 67.0 percent of original size [2021-11-03 05:07:48,942 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 52 [2021-11-03 05:07:48,945 INFO L180 QuantifierPusher]: treesize reduction 31, result has 74.8 percent of original size [2021-11-03 05:07:48,946 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 87 [2021-11-03 05:07:48,947 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:48,951 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:48,952 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:48,952 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:48,952 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:48,954 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:48,957 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:07:48,959 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 138 [2021-11-03 05:07:48,960 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:48,966 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:48,966 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:48,967 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:48,967 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:48,967 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:48,968 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:48,968 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:48,969 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:48,972 INFO L180 QuantifierPusher]: treesize reduction 30, result has 74.1 percent of original size [2021-11-03 05:07:48,973 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 80 [2021-11-03 05:07:48,977 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 05:07:49,777 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 05:07:49,777 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 05:07:49,777 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 61 [2021-11-03 05:07:49,777 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [537343365] [2021-11-03 05:07:49,778 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 62 states [2021-11-03 05:07:49,778 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:07:49,778 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2021-11-03 05:07:49,778 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=766, Invalid=4064, Unknown=0, NotChecked=0, Total=4830 [2021-11-03 05:07:49,779 INFO L87 Difference]: Start difference. First operand 74 states and 89 transitions. Second operand has 62 states, 62 states have (on average 2.0) internal successors, (124), 61 states have internal predecessors, (124), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:07:50,803 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:07:50,804 INFO L93 Difference]: Finished difference Result 176 states and 193 transitions. [2021-11-03 05:07:50,804 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-11-03 05:07:50,804 INFO L78 Accepts]: Start accepts. Automaton has has 62 states, 62 states have (on average 2.0) internal successors, (124), 61 states have internal predecessors, (124), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 60 [2021-11-03 05:07:50,804 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:07:50,804 INFO L225 Difference]: With dead ends: 176 [2021-11-03 05:07:50,804 INFO L226 Difference]: Without dead ends: 131 [2021-11-03 05:07:50,805 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 236 GetRequests, 140 SyntacticMatches, 0 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3351 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=1511, Invalid=7995, Unknown=0, NotChecked=0, Total=9506 [2021-11-03 05:07:50,805 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 131 states. [2021-11-03 05:07:50,986 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 131 to 75. [2021-11-03 05:07:50,986 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 74 states have (on average 1.2162162162162162) internal successors, (90), 74 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) [2021-11-03 05:07:50,986 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 90 transitions. [2021-11-03 05:07:50,986 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 90 transitions. Word has length 60 [2021-11-03 05:07:50,986 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:07:50,986 INFO L470 AbstractCegarLoop]: Abstraction has 75 states and 90 transitions. [2021-11-03 05:07:50,987 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 62 states, 62 states have (on average 2.0) internal successors, (124), 61 states have internal predecessors, (124), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:07:50,987 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 90 transitions. [2021-11-03 05:07:50,987 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-03 05:07:50,987 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:07:50,987 INFO L513 BasicCegarLoop]: trace histogram [14, 13, 13, 12, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:07:51,018 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (105)] Forceful destruction successful, exit code 0 [2021-11-03 05:07:51,187 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2789,105 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:07:51,188 INFO L402 AbstractCegarLoop]: === Iteration 106 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:07:51,188 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:07:51,188 INFO L85 PathProgramCache]: Analyzing trace with hash -1896393838, now seen corresponding path program 67 times [2021-11-03 05:07:51,188 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:07:51,188 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1949257357] [2021-11-03 05:07:51,188 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:07:51,188 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:07:51,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:07:51,527 INFO L134 CoverageAnalysis]: Checked inductivity of 339 backedges. 223 proven. 116 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:07:51,527 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:07:51,527 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1949257357] [2021-11-03 05:07:51,527 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1949257357] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 05:07:51,527 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1868823728] [2021-11-03 05:07:51,527 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-03 05:07:51,527 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:07:51,527 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 05:07:51,528 INFO L229 MonitoredProcess]: Starting monitored process 106 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 05:07:51,529 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (106)] Waiting until timeout for monitored process [2021-11-03 05:07:55,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:07:55,428 INFO L263 TraceCheckSpWp]: Trace formula consists of 246 conjuncts, 32 conjunts are in the unsatisfiable core [2021-11-03 05:07:55,429 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:07:56,339 INFO L134 CoverageAnalysis]: Checked inductivity of 339 backedges. 260 proven. 79 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:07:56,340 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:07:56,524 INFO L134 CoverageAnalysis]: Checked inductivity of 339 backedges. 260 proven. 79 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:07:56,524 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1868823728] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 05:07:56,524 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1239362268] [2021-11-03 05:07:56,525 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-03 05:07:56,525 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 05:07:56,525 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 05:07:56,525 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 05:07:56,525 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 05:07:56,526 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:07:56,527 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:07:56,527 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:07:56,527 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 05:07:56,528 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:07:56,528 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:07:56,528 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 05:07:56,529 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 111 [2021-11-03 05:07:56,530 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_111|], 10=[|v_#valid_112|]} [2021-11-03 05:07:56,534 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:07:56,536 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 [2021-11-03 05:07:56,536 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:07:56,536 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:07:56,537 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:07:56,537 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:07:56,537 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 05:07:56,537 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:56,538 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:07:56,541 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:07:56,541 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:07:56,542 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:07:56,545 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:07:56,545 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 [2021-11-03 05:07:56,546 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:07:56,547 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:07:56,547 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:07:56,547 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:07:56,548 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 05:07:56,548 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:56,549 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:07:56,550 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:07:56,550 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 05:07:56,550 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 05:07:56,551 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:108, output treesize:93 [2021-11-03 05:07:56,554 INFO L180 QuantifierPusher]: treesize reduction 16, result has 87.0 percent of original size [2021-11-03 05:07:56,555 INFO L185 QuantifierPusher]: treesize reduction 7, result has 92.9 percent of original size 91 [2021-11-03 05:07:56,557 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:56,560 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:56,564 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:56,574 INFO L180 QuantifierPusher]: treesize reduction 6, result has 97.7 percent of original size [2021-11-03 05:07:56,576 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 249 [2021-11-03 05:07:56,579 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:56,664 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:56,665 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:56,665 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:56,666 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:56,667 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:56,668 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:56,670 INFO L180 QuantifierPusher]: treesize reduction 24, result has 70.7 percent of original size [2021-11-03 05:07:56,671 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 49 [2021-11-03 05:07:56,674 INFO L180 QuantifierPusher]: treesize reduction 25, result has 71.9 percent of original size [2021-11-03 05:07:56,675 INFO L185 QuantifierPusher]: treesize reduction 5, result has 90.6 percent of original size 48 [2021-11-03 05:07:56,676 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:56,678 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:56,681 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:56,686 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:07:56,688 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 120 [2021-11-03 05:07:56,689 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:56,695 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:56,695 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:56,696 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:56,696 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:56,696 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:56,697 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:56,699 INFO L180 QuantifierPusher]: treesize reduction 24, result has 71.8 percent of original size [2021-11-03 05:07:56,700 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 52 [2021-11-03 05:07:56,703 INFO L180 QuantifierPusher]: treesize reduction 25, result has 78.6 percent of original size [2021-11-03 05:07:56,705 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 90 [2021-11-03 05:07:56,706 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:56,710 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:56,710 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:56,711 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:56,711 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:56,712 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:07:56,715 INFO L180 QuantifierPusher]: treesize reduction 24, result has 78.2 percent of original size [2021-11-03 05:07:56,716 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 80 [2021-11-03 05:07:56,719 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 05:07:57,448 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 05:07:57,448 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 05:07:57,449 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 60 [2021-11-03 05:07:57,449 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [580967646] [2021-11-03 05:07:57,449 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 61 states [2021-11-03 05:07:57,449 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:07:57,449 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2021-11-03 05:07:57,449 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=714, Invalid=3978, Unknown=0, NotChecked=0, Total=4692 [2021-11-03 05:07:57,450 INFO L87 Difference]: Start difference. First operand 75 states and 90 transitions. Second operand has 61 states, 61 states have (on average 2.0327868852459017) internal successors, (124), 60 states have internal predecessors, (124), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:07:58,892 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:07:58,892 INFO L93 Difference]: Finished difference Result 232 states and 250 transitions. [2021-11-03 05:07:58,892 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2021-11-03 05:07:58,892 INFO L78 Accepts]: Start accepts. Automaton has has 61 states, 61 states have (on average 2.0327868852459017) internal successors, (124), 60 states have internal predecessors, (124), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 60 [2021-11-03 05:07:58,892 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:07:58,893 INFO L225 Difference]: With dead ends: 232 [2021-11-03 05:07:58,893 INFO L226 Difference]: Without dead ends: 187 [2021-11-03 05:07:58,894 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 248 GetRequests, 141 SyntacticMatches, 0 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4136 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=1804, Invalid=9968, Unknown=0, NotChecked=0, Total=11772 [2021-11-03 05:07:58,894 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 187 states. [2021-11-03 05:07:59,141 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 187 to 75. [2021-11-03 05:07:59,141 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 74 states have (on average 1.2162162162162162) internal successors, (90), 74 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) [2021-11-03 05:07:59,141 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 90 transitions. [2021-11-03 05:07:59,141 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 90 transitions. Word has length 60 [2021-11-03 05:07:59,141 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:07:59,142 INFO L470 AbstractCegarLoop]: Abstraction has 75 states and 90 transitions. [2021-11-03 05:07:59,142 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 61 states, 61 states have (on average 2.0327868852459017) internal successors, (124), 60 states have internal predecessors, (124), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:07:59,142 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 90 transitions. [2021-11-03 05:07:59,142 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-03 05:07:59,142 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:07:59,143 INFO L513 BasicCegarLoop]: trace histogram [14, 13, 13, 11, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:07:59,179 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (106)] Forceful destruction successful, exit code 0 [2021-11-03 05:07:59,353 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2817,106 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:07:59,353 INFO L402 AbstractCegarLoop]: === Iteration 107 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:07:59,353 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:07:59,353 INFO L85 PathProgramCache]: Analyzing trace with hash -1424790303, now seen corresponding path program 68 times [2021-11-03 05:07:59,353 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:07:59,353 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1553050297] [2021-11-03 05:07:59,353 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:07:59,353 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:07:59,387 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:07:59,694 INFO L134 CoverageAnalysis]: Checked inductivity of 329 backedges. 223 proven. 106 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:07:59,695 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:07:59,695 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1553050297] [2021-11-03 05:07:59,695 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1553050297] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 05:07:59,695 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [16937691] [2021-11-03 05:07:59,695 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-03 05:07:59,695 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:07:59,695 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 05:07:59,696 INFO L229 MonitoredProcess]: Starting monitored process 107 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 05:07:59,697 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (107)] Waiting until timeout for monitored process [2021-11-03 05:08:03,676 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2021-11-03 05:08:03,676 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 05:08:03,677 INFO L263 TraceCheckSpWp]: Trace formula consists of 246 conjuncts, 32 conjunts are in the unsatisfiable core [2021-11-03 05:08:03,678 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:08:04,572 INFO L134 CoverageAnalysis]: Checked inductivity of 329 backedges. 260 proven. 69 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:08:04,572 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:08:04,762 INFO L134 CoverageAnalysis]: Checked inductivity of 329 backedges. 260 proven. 69 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:08:04,762 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [16937691] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 05:08:04,762 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1320487029] [2021-11-03 05:08:04,763 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-03 05:08:04,763 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 05:08:04,763 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 05:08:04,763 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 05:08:04,763 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 05:08:04,765 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:08:04,765 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:08:04,765 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:08:04,766 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 05:08:04,766 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:08:04,766 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:08:04,766 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 05:08:04,767 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 111 [2021-11-03 05:08:04,768 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_112|], 10=[|v_#valid_113|]} [2021-11-03 05:08:04,772 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:08:04,773 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 [2021-11-03 05:08:04,773 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:08:04,773 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:08:04,773 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:08:04,774 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:08:04,774 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 05:08:04,774 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:04,775 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:08:04,777 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:08:04,778 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:08:04,779 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:08:04,781 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:08:04,782 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 [2021-11-03 05:08:04,782 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:08:04,783 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:08:04,783 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:08:04,784 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:08:04,784 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 05:08:04,784 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:04,785 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:08:04,786 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:08:04,787 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 05:08:04,787 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 05:08:04,787 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:108, output treesize:93 [2021-11-03 05:08:04,790 INFO L180 QuantifierPusher]: treesize reduction 16, result has 87.0 percent of original size [2021-11-03 05:08:04,791 INFO L185 QuantifierPusher]: treesize reduction 5, result has 94.8 percent of original size 91 [2021-11-03 05:08:04,793 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:04,796 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:04,800 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:04,810 INFO L180 QuantifierPusher]: treesize reduction 6, result has 97.7 percent of original size [2021-11-03 05:08:04,812 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 249 [2021-11-03 05:08:04,815 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:04,826 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:04,827 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:04,827 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:04,827 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:04,828 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:04,829 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:04,831 INFO L180 QuantifierPusher]: treesize reduction 24, result has 70.7 percent of original size [2021-11-03 05:08:04,832 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 49 [2021-11-03 05:08:04,834 INFO L180 QuantifierPusher]: treesize reduction 25, result has 71.9 percent of original size [2021-11-03 05:08:04,835 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 57 [2021-11-03 05:08:04,836 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:04,839 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:04,842 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:04,847 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:08:04,848 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 122 [2021-11-03 05:08:04,850 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:04,855 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:04,856 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:04,856 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:04,856 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:04,857 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:04,858 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:04,860 INFO L180 QuantifierPusher]: treesize reduction 24, result has 71.8 percent of original size [2021-11-03 05:08:04,861 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 52 [2021-11-03 05:08:04,864 INFO L180 QuantifierPusher]: treesize reduction 25, result has 78.6 percent of original size [2021-11-03 05:08:04,865 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 87 [2021-11-03 05:08:04,866 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:04,870 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:04,870 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:04,871 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:04,871 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:04,872 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:04,877 INFO L180 QuantifierPusher]: treesize reduction 24, result has 78.2 percent of original size [2021-11-03 05:08:04,878 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 80 [2021-11-03 05:08:04,881 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 05:08:05,606 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 05:08:05,607 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 05:08:05,607 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 59 [2021-11-03 05:08:05,607 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [230067366] [2021-11-03 05:08:05,607 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 60 states [2021-11-03 05:08:05,607 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:08:05,607 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2021-11-03 05:08:05,608 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=678, Invalid=3878, Unknown=0, NotChecked=0, Total=4556 [2021-11-03 05:08:05,608 INFO L87 Difference]: Start difference. First operand 75 states and 90 transitions. Second operand has 60 states, 60 states have (on average 2.05) internal successors, (123), 59 states have internal predecessors, (123), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:08:07,570 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:08:07,570 INFO L93 Difference]: Finished difference Result 287 states and 306 transitions. [2021-11-03 05:08:07,571 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2021-11-03 05:08:07,571 INFO L78 Accepts]: Start accepts. Automaton has has 60 states, 60 states have (on average 2.05) internal successors, (123), 59 states have internal predecessors, (123), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 60 [2021-11-03 05:08:07,571 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:08:07,571 INFO L225 Difference]: With dead ends: 287 [2021-11-03 05:08:07,571 INFO L226 Difference]: Without dead ends: 242 [2021-11-03 05:08:07,572 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 258 GetRequests, 142 SyntacticMatches, 0 SemanticMatches, 116 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4859 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=2110, Invalid=11696, Unknown=0, NotChecked=0, Total=13806 [2021-11-03 05:08:07,572 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 242 states. [2021-11-03 05:08:07,774 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 242 to 75. [2021-11-03 05:08:07,774 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 74 states have (on average 1.2162162162162162) internal successors, (90), 74 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) [2021-11-03 05:08:07,775 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 90 transitions. [2021-11-03 05:08:07,775 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 90 transitions. Word has length 60 [2021-11-03 05:08:07,775 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:08:07,775 INFO L470 AbstractCegarLoop]: Abstraction has 75 states and 90 transitions. [2021-11-03 05:08:07,775 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 60 states, 60 states have (on average 2.05) internal successors, (123), 59 states have internal predecessors, (123), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:08:07,775 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 90 transitions. [2021-11-03 05:08:07,775 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-03 05:08:07,775 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:08:07,775 INFO L513 BasicCegarLoop]: trace histogram [14, 13, 13, 10, 3, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:08:07,808 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (107)] Forceful destruction successful, exit code 0 [2021-11-03 05:08:07,981 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2846,107 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:08:07,981 INFO L402 AbstractCegarLoop]: === Iteration 108 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:08:07,981 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:08:07,981 INFO L85 PathProgramCache]: Analyzing trace with hash -1686671950, now seen corresponding path program 69 times [2021-11-03 05:08:07,981 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:08:07,981 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2129329143] [2021-11-03 05:08:07,981 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:08:07,981 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:08:08,014 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:08:08,313 INFO L134 CoverageAnalysis]: Checked inductivity of 321 backedges. 223 proven. 98 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:08:08,313 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:08:08,313 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2129329143] [2021-11-03 05:08:08,313 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2129329143] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 05:08:08,313 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [390653782] [2021-11-03 05:08:08,313 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-03 05:08:08,313 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:08:08,313 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 05:08:08,314 INFO L229 MonitoredProcess]: Starting monitored process 108 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 05:08:08,315 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (108)] Waiting until timeout for monitored process [2021-11-03 05:08:12,343 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-03 05:08:12,343 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 05:08:12,344 INFO L263 TraceCheckSpWp]: Trace formula consists of 246 conjuncts, 32 conjunts are in the unsatisfiable core [2021-11-03 05:08:12,345 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:08:13,215 INFO L134 CoverageAnalysis]: Checked inductivity of 321 backedges. 260 proven. 61 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:08:13,215 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:08:13,395 INFO L134 CoverageAnalysis]: Checked inductivity of 321 backedges. 260 proven. 61 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:08:13,395 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [390653782] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 05:08:13,395 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1101747348] [2021-11-03 05:08:13,396 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-03 05:08:13,396 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 05:08:13,396 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 05:08:13,396 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 05:08:13,397 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 05:08:13,405 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:08:13,406 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:08:13,406 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:08:13,406 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 05:08:13,406 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:08:13,407 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:08:13,407 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 05:08:13,408 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 111 [2021-11-03 05:08:13,409 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_113|], 10=[|v_#valid_114|]} [2021-11-03 05:08:13,418 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:08:13,419 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 [2021-11-03 05:08:13,419 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:08:13,419 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:08:13,419 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:08:13,420 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:08:13,420 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 05:08:13,420 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:13,421 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:08:13,424 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:08:13,424 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:08:13,425 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:08:13,427 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:08:13,428 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 [2021-11-03 05:08:13,428 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:08:13,429 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:08:13,430 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:08:13,430 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:08:13,430 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 05:08:13,430 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:13,431 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:08:13,432 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:08:13,433 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 05:08:13,433 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 05:08:13,433 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:108, output treesize:93 [2021-11-03 05:08:13,436 INFO L180 QuantifierPusher]: treesize reduction 16, result has 87.0 percent of original size [2021-11-03 05:08:13,437 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 100 [2021-11-03 05:08:13,439 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:13,442 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:13,446 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:13,455 INFO L180 QuantifierPusher]: treesize reduction 11, result has 95.8 percent of original size [2021-11-03 05:08:13,458 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 251 [2021-11-03 05:08:13,460 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:13,471 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:13,471 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:13,472 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:13,472 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:13,473 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:13,474 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:13,476 INFO L180 QuantifierPusher]: treesize reduction 24, result has 70.7 percent of original size [2021-11-03 05:08:13,477 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 49 [2021-11-03 05:08:13,479 INFO L180 QuantifierPusher]: treesize reduction 25, result has 71.9 percent of original size [2021-11-03 05:08:13,480 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 57 [2021-11-03 05:08:13,481 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:13,484 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:13,486 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:13,491 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:08:13,493 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 122 [2021-11-03 05:08:13,494 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:13,500 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:13,500 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:13,501 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:13,501 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:13,501 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:13,502 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:13,504 INFO L180 QuantifierPusher]: treesize reduction 24, result has 71.8 percent of original size [2021-11-03 05:08:13,505 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 52 [2021-11-03 05:08:13,508 INFO L180 QuantifierPusher]: treesize reduction 25, result has 78.6 percent of original size [2021-11-03 05:08:13,510 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 87 [2021-11-03 05:08:13,511 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:13,514 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:13,515 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:13,515 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:13,516 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:13,517 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:13,519 INFO L180 QuantifierPusher]: treesize reduction 24, result has 78.2 percent of original size [2021-11-03 05:08:13,520 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 80 [2021-11-03 05:08:13,524 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 05:08:14,247 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 05:08:14,247 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 05:08:14,247 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 58 [2021-11-03 05:08:14,247 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1429467032] [2021-11-03 05:08:14,247 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 59 states [2021-11-03 05:08:14,247 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:08:14,248 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2021-11-03 05:08:14,248 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=646, Invalid=3776, Unknown=0, NotChecked=0, Total=4422 [2021-11-03 05:08:14,248 INFO L87 Difference]: Start difference. First operand 75 states and 90 transitions. Second operand has 59 states, 59 states have (on average 2.0677966101694913) internal successors, (122), 58 states have internal predecessors, (122), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:08:16,429 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:08:16,429 INFO L93 Difference]: Finished difference Result 341 states and 361 transitions. [2021-11-03 05:08:16,429 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2021-11-03 05:08:16,429 INFO L78 Accepts]: Start accepts. Automaton has has 59 states, 59 states have (on average 2.0677966101694913) internal successors, (122), 58 states have internal predecessors, (122), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 60 [2021-11-03 05:08:16,429 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:08:16,430 INFO L225 Difference]: With dead ends: 341 [2021-11-03 05:08:16,430 INFO L226 Difference]: Without dead ends: 296 [2021-11-03 05:08:16,431 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 266 GetRequests, 143 SyntacticMatches, 0 SemanticMatches, 123 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5467 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=2376, Invalid=13124, Unknown=0, NotChecked=0, Total=15500 [2021-11-03 05:08:16,431 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 296 states. [2021-11-03 05:08:16,674 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 296 to 75. [2021-11-03 05:08:16,675 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 74 states have (on average 1.2162162162162162) internal successors, (90), 74 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) [2021-11-03 05:08:16,675 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 90 transitions. [2021-11-03 05:08:16,675 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 90 transitions. Word has length 60 [2021-11-03 05:08:16,675 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:08:16,675 INFO L470 AbstractCegarLoop]: Abstraction has 75 states and 90 transitions. [2021-11-03 05:08:16,675 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 59 states, 59 states have (on average 2.0677966101694913) internal successors, (122), 58 states have internal predecessors, (122), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:08:16,675 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 90 transitions. [2021-11-03 05:08:16,676 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-03 05:08:16,676 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:08:16,676 INFO L513 BasicCegarLoop]: trace histogram [14, 13, 13, 9, 4, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:08:16,716 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (108)] Ended with exit code 0 [2021-11-03 05:08:16,889 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 108 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2875 [2021-11-03 05:08:16,889 INFO L402 AbstractCegarLoop]: === Iteration 109 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:08:16,889 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:08:16,889 INFO L85 PathProgramCache]: Analyzing trace with hash 521637569, now seen corresponding path program 70 times [2021-11-03 05:08:16,889 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:08:16,889 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1858218557] [2021-11-03 05:08:16,889 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:08:16,889 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:08:16,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:08:17,222 INFO L134 CoverageAnalysis]: Checked inductivity of 315 backedges. 223 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:08:17,222 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:08:17,223 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1858218557] [2021-11-03 05:08:17,223 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1858218557] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 05:08:17,223 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1819077424] [2021-11-03 05:08:17,223 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-03 05:08:17,223 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:08:17,223 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 05:08:17,224 INFO L229 MonitoredProcess]: Starting monitored process 109 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 05:08:17,224 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (109)] Waiting until timeout for monitored process [2021-11-03 05:08:21,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:08:21,386 INFO L263 TraceCheckSpWp]: Trace formula consists of 246 conjuncts, 32 conjunts are in the unsatisfiable core [2021-11-03 05:08:21,387 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:08:22,232 INFO L134 CoverageAnalysis]: Checked inductivity of 315 backedges. 260 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:08:22,233 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:08:22,411 INFO L134 CoverageAnalysis]: Checked inductivity of 315 backedges. 260 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:08:22,411 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1819077424] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 05:08:22,411 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1196690134] [2021-11-03 05:08:22,411 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-03 05:08:22,412 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 05:08:22,412 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 05:08:22,412 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 05:08:22,412 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 05:08:22,414 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:08:22,414 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:08:22,414 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:08:22,415 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 05:08:22,415 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:08:22,415 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:08:22,415 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 05:08:22,416 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 111 [2021-11-03 05:08:22,417 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_114|], 10=[|v_#valid_115|]} [2021-11-03 05:08:22,421 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:08:22,421 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 [2021-11-03 05:08:22,422 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:08:22,422 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:08:22,422 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:08:22,422 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:08:22,422 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 05:08:22,423 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:22,424 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:08:22,426 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:08:22,427 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:08:22,427 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:08:22,430 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:08:22,430 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 [2021-11-03 05:08:22,431 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:08:22,432 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:08:22,432 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:08:22,432 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:08:22,432 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 05:08:22,433 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:22,434 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:08:22,434 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:08:22,435 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 05:08:22,435 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 05:08:22,435 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:108, output treesize:93 [2021-11-03 05:08:22,438 INFO L180 QuantifierPusher]: treesize reduction 16, result has 87.0 percent of original size [2021-11-03 05:08:22,440 INFO L185 QuantifierPusher]: treesize reduction 7, result has 92.9 percent of original size 91 [2021-11-03 05:08:22,441 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:22,445 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:22,448 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:22,457 INFO L180 QuantifierPusher]: treesize reduction 6, result has 97.7 percent of original size [2021-11-03 05:08:22,460 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 249 [2021-11-03 05:08:22,462 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:22,474 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:22,474 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:22,475 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:22,475 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:22,476 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:22,477 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:22,479 INFO L180 QuantifierPusher]: treesize reduction 24, result has 70.7 percent of original size [2021-11-03 05:08:22,480 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 49 [2021-11-03 05:08:22,482 INFO L180 QuantifierPusher]: treesize reduction 25, result has 71.9 percent of original size [2021-11-03 05:08:22,483 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 57 [2021-11-03 05:08:22,484 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:22,487 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:22,489 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:22,494 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:08:22,496 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 122 [2021-11-03 05:08:22,497 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:22,503 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:22,503 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:22,503 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:22,504 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:22,504 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:22,505 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:22,507 INFO L180 QuantifierPusher]: treesize reduction 24, result has 71.8 percent of original size [2021-11-03 05:08:22,508 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 52 [2021-11-03 05:08:22,511 INFO L180 QuantifierPusher]: treesize reduction 25, result has 78.6 percent of original size [2021-11-03 05:08:22,512 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 87 [2021-11-03 05:08:22,514 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:22,517 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:22,517 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:22,518 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:22,518 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:22,519 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:22,522 INFO L180 QuantifierPusher]: treesize reduction 24, result has 78.2 percent of original size [2021-11-03 05:08:22,523 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 80 [2021-11-03 05:08:22,526 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 05:08:23,245 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 05:08:23,245 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 05:08:23,245 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 57 [2021-11-03 05:08:23,246 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1045745164] [2021-11-03 05:08:23,246 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 58 states [2021-11-03 05:08:23,246 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:08:23,246 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2021-11-03 05:08:23,246 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=618, Invalid=3672, Unknown=0, NotChecked=0, Total=4290 [2021-11-03 05:08:23,247 INFO L87 Difference]: Start difference. First operand 75 states and 90 transitions. Second operand has 58 states, 58 states have (on average 2.086206896551724) internal successors, (121), 57 states have internal predecessors, (121), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:08:25,695 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:08:25,695 INFO L93 Difference]: Finished difference Result 394 states and 415 transitions. [2021-11-03 05:08:25,695 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2021-11-03 05:08:25,696 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 58 states have (on average 2.086206896551724) internal successors, (121), 57 states have internal predecessors, (121), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 60 [2021-11-03 05:08:25,696 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:08:25,696 INFO L225 Difference]: With dead ends: 394 [2021-11-03 05:08:25,696 INFO L226 Difference]: Without dead ends: 349 [2021-11-03 05:08:25,697 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 272 GetRequests, 144 SyntacticMatches, 0 SemanticMatches, 128 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5929 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=2581, Invalid=14189, Unknown=0, NotChecked=0, Total=16770 [2021-11-03 05:08:25,697 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 349 states. [2021-11-03 05:08:25,907 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 349 to 75. [2021-11-03 05:08:25,908 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 74 states have (on average 1.2162162162162162) internal successors, (90), 74 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) [2021-11-03 05:08:25,908 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 90 transitions. [2021-11-03 05:08:25,908 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 90 transitions. Word has length 60 [2021-11-03 05:08:25,908 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:08:25,908 INFO L470 AbstractCegarLoop]: Abstraction has 75 states and 90 transitions. [2021-11-03 05:08:25,909 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 58 states, 58 states have (on average 2.086206896551724) internal successors, (121), 57 states have internal predecessors, (121), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:08:25,909 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 90 transitions. [2021-11-03 05:08:25,909 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-03 05:08:25,909 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:08:25,909 INFO L513 BasicCegarLoop]: trace histogram [14, 13, 13, 8, 5, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:08:25,976 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (109)] Forceful destruction successful, exit code 0 [2021-11-03 05:08:26,125 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2904,109 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:08:26,125 INFO L402 AbstractCegarLoop]: === Iteration 110 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:08:26,125 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:08:26,125 INFO L85 PathProgramCache]: Analyzing trace with hash -1485336622, now seen corresponding path program 71 times [2021-11-03 05:08:26,125 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:08:26,125 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [113912870] [2021-11-03 05:08:26,125 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:08:26,126 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:08:26,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:08:26,544 INFO L134 CoverageAnalysis]: Checked inductivity of 311 backedges. 223 proven. 88 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:08:26,544 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:08:26,545 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [113912870] [2021-11-03 05:08:26,545 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [113912870] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 05:08:26,545 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [934701719] [2021-11-03 05:08:26,545 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-03 05:08:26,545 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:08:26,545 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 05:08:26,546 INFO L229 MonitoredProcess]: Starting monitored process 110 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 05:08:26,561 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (110)] Waiting until timeout for monitored process [2021-11-03 05:08:30,996 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2021-11-03 05:08:30,996 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 05:08:30,998 INFO L263 TraceCheckSpWp]: Trace formula consists of 246 conjuncts, 32 conjunts are in the unsatisfiable core [2021-11-03 05:08:30,999 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:08:31,860 INFO L134 CoverageAnalysis]: Checked inductivity of 311 backedges. 260 proven. 51 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:08:31,860 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:08:32,039 INFO L134 CoverageAnalysis]: Checked inductivity of 311 backedges. 260 proven. 51 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:08:32,039 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [934701719] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 05:08:32,039 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [934720107] [2021-11-03 05:08:32,040 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-03 05:08:32,040 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 05:08:32,040 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 05:08:32,040 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 05:08:32,040 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 05:08:32,045 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:08:32,045 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:08:32,045 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:08:32,046 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 05:08:32,046 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:08:32,046 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:08:32,046 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 05:08:32,047 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 111 [2021-11-03 05:08:32,061 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_115|], 10=[|v_#valid_116|]} [2021-11-03 05:08:32,067 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:08:32,067 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 [2021-11-03 05:08:32,068 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:08:32,068 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:08:32,069 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:08:32,069 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:08:32,069 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 05:08:32,070 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:32,072 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:08:32,074 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:08:32,075 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:08:32,076 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:08:32,079 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:08:32,080 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 [2021-11-03 05:08:32,081 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:08:32,082 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:08:32,083 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:08:32,083 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:08:32,083 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 05:08:32,083 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:32,085 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:08:32,086 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:08:32,087 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 05:08:32,088 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 05:08:32,088 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:108, output treesize:93 [2021-11-03 05:08:32,093 INFO L180 QuantifierPusher]: treesize reduction 16, result has 87.0 percent of original size [2021-11-03 05:08:32,094 INFO L185 QuantifierPusher]: treesize reduction 5, result has 94.8 percent of original size 91 [2021-11-03 05:08:32,096 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:32,102 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:32,108 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:32,124 INFO L180 QuantifierPusher]: treesize reduction 6, result has 97.7 percent of original size [2021-11-03 05:08:32,128 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 249 [2021-11-03 05:08:32,131 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:32,149 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:32,149 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:32,150 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:32,150 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:32,151 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:32,153 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:32,156 INFO L180 QuantifierPusher]: treesize reduction 24, result has 70.7 percent of original size [2021-11-03 05:08:32,157 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 49 [2021-11-03 05:08:32,161 INFO L180 QuantifierPusher]: treesize reduction 25, result has 71.9 percent of original size [2021-11-03 05:08:32,162 INFO L185 QuantifierPusher]: treesize reduction 5, result has 90.6 percent of original size 48 [2021-11-03 05:08:32,163 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:32,167 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:32,171 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:32,179 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:08:32,181 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 120 [2021-11-03 05:08:32,183 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:32,191 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:32,192 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:32,193 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:32,193 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:32,194 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:32,195 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:32,198 INFO L180 QuantifierPusher]: treesize reduction 24, result has 71.8 percent of original size [2021-11-03 05:08:32,200 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 52 [2021-11-03 05:08:32,204 INFO L180 QuantifierPusher]: treesize reduction 25, result has 78.6 percent of original size [2021-11-03 05:08:32,206 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 90 [2021-11-03 05:08:32,208 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:32,213 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:32,214 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:32,214 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:32,215 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:32,216 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:32,220 INFO L180 QuantifierPusher]: treesize reduction 24, result has 78.2 percent of original size [2021-11-03 05:08:32,222 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 80 [2021-11-03 05:08:32,226 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 05:08:33,256 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 05:08:33,256 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 05:08:33,256 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 56 [2021-11-03 05:08:33,256 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [773807489] [2021-11-03 05:08:33,257 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 57 states [2021-11-03 05:08:33,257 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:08:33,257 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2021-11-03 05:08:33,257 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=594, Invalid=3566, Unknown=0, NotChecked=0, Total=4160 [2021-11-03 05:08:33,258 INFO L87 Difference]: Start difference. First operand 75 states and 90 transitions. Second operand has 57 states, 57 states have (on average 2.1052631578947367) internal successors, (120), 56 states have internal predecessors, (120), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:08:35,973 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:08:35,973 INFO L93 Difference]: Finished difference Result 446 states and 468 transitions. [2021-11-03 05:08:35,974 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2021-11-03 05:08:35,974 INFO L78 Accepts]: Start accepts. Automaton has has 57 states, 57 states have (on average 2.1052631578947367) internal successors, (120), 56 states have internal predecessors, (120), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 60 [2021-11-03 05:08:35,974 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:08:35,974 INFO L225 Difference]: With dead ends: 446 [2021-11-03 05:08:35,974 INFO L226 Difference]: Without dead ends: 401 [2021-11-03 05:08:35,975 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 276 GetRequests, 145 SyntacticMatches, 0 SemanticMatches, 131 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6212 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=2710, Invalid=14846, Unknown=0, NotChecked=0, Total=17556 [2021-11-03 05:08:35,975 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 401 states. [2021-11-03 05:08:36,187 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 401 to 75. [2021-11-03 05:08:36,187 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 74 states have (on average 1.2162162162162162) internal successors, (90), 74 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) [2021-11-03 05:08:36,187 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 90 transitions. [2021-11-03 05:08:36,187 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 90 transitions. Word has length 60 [2021-11-03 05:08:36,187 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:08:36,188 INFO L470 AbstractCegarLoop]: Abstraction has 75 states and 90 transitions. [2021-11-03 05:08:36,188 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 57 states, 57 states have (on average 2.1052631578947367) internal successors, (120), 56 states have internal predecessors, (120), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:08:36,188 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 90 transitions. [2021-11-03 05:08:36,188 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-03 05:08:36,188 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:08:36,188 INFO L513 BasicCegarLoop]: trace histogram [14, 13, 13, 7, 6, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:08:36,224 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (110)] Ended with exit code 0 [2021-11-03 05:08:36,388 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2933,110 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:08:36,389 INFO L402 AbstractCegarLoop]: === Iteration 111 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:08:36,389 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:08:36,389 INFO L85 PathProgramCache]: Analyzing trace with hash 528132257, now seen corresponding path program 72 times [2021-11-03 05:08:36,389 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:08:36,389 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1598019461] [2021-11-03 05:08:36,389 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:08:36,389 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:08:36,426 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:08:36,724 INFO L134 CoverageAnalysis]: Checked inductivity of 309 backedges. 223 proven. 86 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:08:36,724 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:08:36,724 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1598019461] [2021-11-03 05:08:36,724 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1598019461] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 05:08:36,724 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [903768409] [2021-11-03 05:08:36,724 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-03 05:08:36,724 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:08:36,724 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 05:08:36,725 INFO L229 MonitoredProcess]: Starting monitored process 111 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 05:08:36,726 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (111)] Waiting until timeout for monitored process [2021-11-03 05:08:40,939 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-03 05:08:40,939 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 05:08:40,941 INFO L263 TraceCheckSpWp]: Trace formula consists of 246 conjuncts, 32 conjunts are in the unsatisfiable core [2021-11-03 05:08:40,942 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:08:41,792 INFO L134 CoverageAnalysis]: Checked inductivity of 309 backedges. 260 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:08:41,792 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:08:41,998 INFO L134 CoverageAnalysis]: Checked inductivity of 309 backedges. 260 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:08:41,998 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [903768409] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 05:08:41,998 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [339549377] [2021-11-03 05:08:41,999 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-03 05:08:41,999 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 05:08:42,000 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 05:08:42,000 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 05:08:42,000 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 05:08:42,002 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:08:42,003 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:08:42,004 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:08:42,004 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 05:08:42,004 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:08:42,005 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:08:42,005 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 05:08:42,006 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 111 [2021-11-03 05:08:42,008 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_116|], 10=[|v_#valid_117|]} [2021-11-03 05:08:42,013 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:08:42,014 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 [2021-11-03 05:08:42,015 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:08:42,015 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:08:42,015 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:08:42,016 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:08:42,016 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 05:08:42,016 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:42,018 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:08:42,021 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:08:42,022 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:08:42,023 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:08:42,027 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:08:42,027 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 [2021-11-03 05:08:42,028 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:08:42,029 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:08:42,030 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:08:42,030 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:08:42,031 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 05:08:42,031 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:42,033 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:08:42,034 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:08:42,035 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 05:08:42,035 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 05:08:42,036 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:108, output treesize:93 [2021-11-03 05:08:42,040 INFO L180 QuantifierPusher]: treesize reduction 16, result has 87.0 percent of original size [2021-11-03 05:08:42,042 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 100 [2021-11-03 05:08:42,044 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:42,050 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:42,056 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:42,070 INFO L180 QuantifierPusher]: treesize reduction 11, result has 95.8 percent of original size [2021-11-03 05:08:42,074 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 251 [2021-11-03 05:08:42,078 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:42,094 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:42,095 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:42,096 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:42,096 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:42,097 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:42,099 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:42,102 INFO L180 QuantifierPusher]: treesize reduction 24, result has 70.7 percent of original size [2021-11-03 05:08:42,103 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 49 [2021-11-03 05:08:42,106 INFO L180 QuantifierPusher]: treesize reduction 25, result has 71.9 percent of original size [2021-11-03 05:08:42,108 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 57 [2021-11-03 05:08:42,109 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:42,113 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:42,118 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:42,125 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:08:42,127 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 122 [2021-11-03 05:08:42,129 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:42,135 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:42,135 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:42,136 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:42,136 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:42,136 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:42,137 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:42,139 INFO L180 QuantifierPusher]: treesize reduction 24, result has 71.8 percent of original size [2021-11-03 05:08:42,140 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 52 [2021-11-03 05:08:42,143 INFO L180 QuantifierPusher]: treesize reduction 25, result has 78.6 percent of original size [2021-11-03 05:08:42,145 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 90 [2021-11-03 05:08:42,146 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:42,149 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:42,150 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:42,150 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:42,151 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:42,152 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:42,154 INFO L180 QuantifierPusher]: treesize reduction 24, result has 78.2 percent of original size [2021-11-03 05:08:42,155 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 80 [2021-11-03 05:08:42,159 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 05:08:42,881 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 05:08:42,881 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 05:08:42,881 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 55 [2021-11-03 05:08:42,881 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1637027420] [2021-11-03 05:08:42,881 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 56 states [2021-11-03 05:08:42,882 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:08:42,882 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2021-11-03 05:08:42,882 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=574, Invalid=3458, Unknown=0, NotChecked=0, Total=4032 [2021-11-03 05:08:42,882 INFO L87 Difference]: Start difference. First operand 75 states and 90 transitions. Second operand has 56 states, 56 states have (on average 2.125) internal successors, (119), 55 states have internal predecessors, (119), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:08:45,921 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:08:45,921 INFO L93 Difference]: Finished difference Result 497 states and 520 transitions. [2021-11-03 05:08:45,921 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 79 states. [2021-11-03 05:08:45,921 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 56 states have (on average 2.125) internal successors, (119), 55 states have internal predecessors, (119), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 60 [2021-11-03 05:08:45,921 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:08:45,922 INFO L225 Difference]: With dead ends: 497 [2021-11-03 05:08:45,922 INFO L226 Difference]: Without dead ends: 452 [2021-11-03 05:08:45,923 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 278 GetRequests, 146 SyntacticMatches, 0 SemanticMatches, 132 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6295 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=2754, Invalid=15068, Unknown=0, NotChecked=0, Total=17822 [2021-11-03 05:08:45,924 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 452 states. [2021-11-03 05:08:46,145 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 452 to 75. [2021-11-03 05:08:46,146 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 74 states have (on average 1.2162162162162162) internal successors, (90), 74 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) [2021-11-03 05:08:46,146 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 90 transitions. [2021-11-03 05:08:46,146 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 90 transitions. Word has length 60 [2021-11-03 05:08:46,146 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:08:46,146 INFO L470 AbstractCegarLoop]: Abstraction has 75 states and 90 transitions. [2021-11-03 05:08:46,146 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 56 states, 56 states have (on average 2.125) internal successors, (119), 55 states have internal predecessors, (119), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:08:46,146 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 90 transitions. [2021-11-03 05:08:46,147 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-03 05:08:46,147 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:08:46,147 INFO L513 BasicCegarLoop]: trace histogram [14, 13, 13, 7, 6, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:08:46,184 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (111)] Forceful destruction successful, exit code 0 [2021-11-03 05:08:46,353 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 111 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2962 [2021-11-03 05:08:46,353 INFO L402 AbstractCegarLoop]: === Iteration 112 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:08:46,353 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:08:46,353 INFO L85 PathProgramCache]: Analyzing trace with hash 593082866, now seen corresponding path program 73 times [2021-11-03 05:08:46,353 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:08:46,353 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1739370115] [2021-11-03 05:08:46,353 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:08:46,354 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:08:46,389 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:08:46,683 INFO L134 CoverageAnalysis]: Checked inductivity of 309 backedges. 223 proven. 86 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:08:46,683 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:08:46,683 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1739370115] [2021-11-03 05:08:46,683 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1739370115] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 05:08:46,684 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [690351969] [2021-11-03 05:08:46,684 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-03 05:08:46,684 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:08:46,684 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 05:08:46,684 INFO L229 MonitoredProcess]: Starting monitored process 112 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 05:08:46,685 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (112)] Waiting until timeout for monitored process [2021-11-03 05:08:50,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:08:50,961 INFO L263 TraceCheckSpWp]: Trace formula consists of 246 conjuncts, 32 conjunts are in the unsatisfiable core [2021-11-03 05:08:50,961 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:08:51,761 INFO L134 CoverageAnalysis]: Checked inductivity of 309 backedges. 260 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:08:51,761 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:08:51,939 INFO L134 CoverageAnalysis]: Checked inductivity of 309 backedges. 260 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:08:51,939 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [690351969] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 05:08:51,939 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2089108993] [2021-11-03 05:08:51,940 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-03 05:08:51,940 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 05:08:51,940 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 05:08:51,940 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 05:08:51,940 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 05:08:51,941 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:08:51,942 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:08:51,942 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:08:51,942 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 05:08:51,943 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:08:51,943 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:08:51,943 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 05:08:51,944 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 111 [2021-11-03 05:08:51,945 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_117|], 10=[|v_#valid_118|]} [2021-11-03 05:08:51,949 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:08:51,949 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 [2021-11-03 05:08:51,950 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:08:51,950 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:08:51,950 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:08:51,950 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:08:51,950 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 05:08:51,951 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:51,952 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:08:51,954 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:08:51,955 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:08:51,956 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:08:51,958 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:08:51,959 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 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 [2021-11-03 05:08:51,959 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:08:51,960 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:08:51,960 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:08:51,961 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:08:51,961 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 05:08:51,961 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:51,962 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:08:51,963 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:08:51,963 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 05:08:51,964 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 05:08:51,964 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:108, output treesize:93 [2021-11-03 05:08:51,967 INFO L180 QuantifierPusher]: treesize reduction 16, result has 87.0 percent of original size [2021-11-03 05:08:51,968 INFO L185 QuantifierPusher]: treesize reduction 5, result has 94.8 percent of original size 91 [2021-11-03 05:08:51,970 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:51,973 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:51,977 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:51,987 INFO L180 QuantifierPusher]: treesize reduction 6, result has 97.7 percent of original size [2021-11-03 05:08:51,989 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 249 [2021-11-03 05:08:51,992 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:52,003 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:52,004 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:52,004 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:52,004 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:52,005 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:52,006 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:52,008 INFO L180 QuantifierPusher]: treesize reduction 24, result has 70.7 percent of original size [2021-11-03 05:08:52,009 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 49 [2021-11-03 05:08:52,011 INFO L180 QuantifierPusher]: treesize reduction 25, result has 71.9 percent of original size [2021-11-03 05:08:52,012 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 57 [2021-11-03 05:08:52,013 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:52,016 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:52,019 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:52,024 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:08:52,025 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 122 [2021-11-03 05:08:52,027 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:52,032 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:52,033 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:52,033 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:52,033 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:52,034 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:52,035 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:52,037 INFO L180 QuantifierPusher]: treesize reduction 24, result has 71.8 percent of original size [2021-11-03 05:08:52,038 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 52 [2021-11-03 05:08:52,041 INFO L180 QuantifierPusher]: treesize reduction 25, result has 78.6 percent of original size [2021-11-03 05:08:52,042 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 87 [2021-11-03 05:08:52,043 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:52,047 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:52,047 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:52,048 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:52,048 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:52,049 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:08:52,052 INFO L180 QuantifierPusher]: treesize reduction 24, result has 78.2 percent of original size [2021-11-03 05:08:52,053 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 80 [2021-11-03 05:08:52,056 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 05:08:52,772 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 05:08:52,772 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 05:08:52,772 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 54 [2021-11-03 05:08:52,772 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [422667493] [2021-11-03 05:08:52,773 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2021-11-03 05:08:52,773 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:08:52,773 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2021-11-03 05:08:52,773 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=558, Invalid=3348, Unknown=0, NotChecked=0, Total=3906 [2021-11-03 05:08:52,773 INFO L87 Difference]: Start difference. First operand 75 states and 90 transitions. Second operand has 55 states, 55 states have (on average 2.1454545454545455) internal successors, (118), 54 states have internal predecessors, (118), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:08:55,892 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:08:55,892 INFO L93 Difference]: Finished difference Result 547 states and 571 transitions. [2021-11-03 05:08:55,892 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 80 states. [2021-11-03 05:08:55,893 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 55 states have (on average 2.1454545454545455) internal successors, (118), 54 states have internal predecessors, (118), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 60 [2021-11-03 05:08:55,893 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:08:55,893 INFO L225 Difference]: With dead ends: 547 [2021-11-03 05:08:55,893 INFO L226 Difference]: Without dead ends: 502 [2021-11-03 05:08:55,894 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 278 GetRequests, 147 SyntacticMatches, 0 SemanticMatches, 131 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6169 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=2710, Invalid=14846, Unknown=0, NotChecked=0, Total=17556 [2021-11-03 05:08:55,894 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 502 states. [2021-11-03 05:08:56,108 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 502 to 75. [2021-11-03 05:08:56,108 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 74 states have (on average 1.2162162162162162) internal successors, (90), 74 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) [2021-11-03 05:08:56,108 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 90 transitions. [2021-11-03 05:08:56,108 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 90 transitions. Word has length 60 [2021-11-03 05:08:56,108 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:08:56,108 INFO L470 AbstractCegarLoop]: Abstraction has 75 states and 90 transitions. [2021-11-03 05:08:56,108 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 55 states, 55 states have (on average 2.1454545454545455) internal successors, (118), 54 states have internal predecessors, (118), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:08:56,108 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 90 transitions. [2021-11-03 05:08:56,109 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-03 05:08:56,109 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:08:56,109 INFO L513 BasicCegarLoop]: trace histogram [14, 13, 13, 8, 5, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:08:56,145 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (112)] Forceful destruction successful, exit code 0 [2021-11-03 05:08:56,321 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 112 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2991 [2021-11-03 05:08:56,321 INFO L402 AbstractCegarLoop]: === Iteration 113 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:08:56,321 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:08:56,321 INFO L85 PathProgramCache]: Analyzing trace with hash -1483031935, now seen corresponding path program 74 times [2021-11-03 05:08:56,321 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:08:56,321 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [973986436] [2021-11-03 05:08:56,321 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:08:56,321 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:08:56,357 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:08:56,648 INFO L134 CoverageAnalysis]: Checked inductivity of 311 backedges. 223 proven. 88 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:08:56,648 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:08:56,648 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [973986436] [2021-11-03 05:08:56,648 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [973986436] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 05:08:56,648 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1148253946] [2021-11-03 05:08:56,648 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-03 05:08:56,648 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:08:56,648 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 05:08:56,649 INFO L229 MonitoredProcess]: Starting monitored process 113 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 05:08:56,650 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (113)] Waiting until timeout for monitored process [2021-11-03 05:09:00,994 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2021-11-03 05:09:00,995 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 05:09:00,996 INFO L263 TraceCheckSpWp]: Trace formula consists of 246 conjuncts, 32 conjunts are in the unsatisfiable core [2021-11-03 05:09:00,997 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:09:01,779 INFO L134 CoverageAnalysis]: Checked inductivity of 311 backedges. 260 proven. 51 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:09:01,779 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:09:01,972 INFO L134 CoverageAnalysis]: Checked inductivity of 311 backedges. 260 proven. 51 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:09:01,973 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1148253946] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 05:09:01,973 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [48430443] [2021-11-03 05:09:01,973 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-03 05:09:01,973 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 05:09:01,974 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 05:09:01,974 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 05:09:01,974 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 05:09:01,975 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:09:01,976 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:09:01,976 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:09:01,976 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 05:09:01,976 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:09:01,977 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:09:01,977 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 05:09:01,977 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 111 [2021-11-03 05:09:01,978 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_118|], 10=[|v_#valid_119|]} [2021-11-03 05:09:01,983 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:09:01,983 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 [2021-11-03 05:09:01,983 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:09:01,984 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:09:01,984 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:09:01,984 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:09:01,984 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 05:09:01,984 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:01,986 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:09:01,988 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:09:01,989 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:09:01,989 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:09:01,992 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:09:01,993 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 [2021-11-03 05:09:01,993 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:09:01,994 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:09:01,994 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:09:01,994 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:09:01,995 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 05:09:01,995 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:01,996 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:09:01,997 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:09:01,997 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 05:09:01,997 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 05:09:01,997 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:108, output treesize:93 [2021-11-03 05:09:02,001 INFO L180 QuantifierPusher]: treesize reduction 16, result has 87.0 percent of original size [2021-11-03 05:09:02,002 INFO L185 QuantifierPusher]: treesize reduction 5, result has 94.8 percent of original size 91 [2021-11-03 05:09:02,003 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:02,007 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:02,011 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:02,021 INFO L180 QuantifierPusher]: treesize reduction 6, result has 97.7 percent of original size [2021-11-03 05:09:02,023 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 249 [2021-11-03 05:09:02,026 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:02,037 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:02,038 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:02,038 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:02,039 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:02,039 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:02,040 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:02,042 INFO L180 QuantifierPusher]: treesize reduction 24, result has 70.7 percent of original size [2021-11-03 05:09:02,043 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 49 [2021-11-03 05:09:02,045 INFO L180 QuantifierPusher]: treesize reduction 25, result has 71.9 percent of original size [2021-11-03 05:09:02,046 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 57 [2021-11-03 05:09:02,048 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:02,050 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:02,053 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:02,058 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:09:02,059 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 122 [2021-11-03 05:09:02,061 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:02,066 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:02,067 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:02,067 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:02,068 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:02,068 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:02,069 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:02,071 INFO L180 QuantifierPusher]: treesize reduction 24, result has 71.8 percent of original size [2021-11-03 05:09:02,072 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 52 [2021-11-03 05:09:02,075 INFO L180 QuantifierPusher]: treesize reduction 25, result has 78.6 percent of original size [2021-11-03 05:09:02,076 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 90 [2021-11-03 05:09:02,087 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:02,093 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:02,093 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:02,094 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:02,094 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:02,096 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:02,099 INFO L180 QuantifierPusher]: treesize reduction 24, result has 78.2 percent of original size [2021-11-03 05:09:02,100 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 80 [2021-11-03 05:09:02,104 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 05:09:02,818 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 05:09:02,819 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 05:09:02,819 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 53 [2021-11-03 05:09:02,819 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [243632459] [2021-11-03 05:09:02,819 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 54 states [2021-11-03 05:09:02,819 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:09:02,819 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2021-11-03 05:09:02,885 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=546, Invalid=3236, Unknown=0, NotChecked=0, Total=3782 [2021-11-03 05:09:02,886 INFO L87 Difference]: Start difference. First operand 75 states and 90 transitions. Second operand has 54 states, 54 states have (on average 2.1666666666666665) internal successors, (117), 53 states have internal predecessors, (117), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:09:06,031 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:09:06,031 INFO L93 Difference]: Finished difference Result 596 states and 621 transitions. [2021-11-03 05:09:06,031 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 79 states. [2021-11-03 05:09:06,031 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 54 states have (on average 2.1666666666666665) internal successors, (117), 53 states have internal predecessors, (117), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 60 [2021-11-03 05:09:06,031 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:09:06,032 INFO L225 Difference]: With dead ends: 596 [2021-11-03 05:09:06,032 INFO L226 Difference]: Without dead ends: 551 [2021-11-03 05:09:06,033 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 276 GetRequests, 148 SyntacticMatches, 0 SemanticMatches, 128 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5837 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=2581, Invalid=14189, Unknown=0, NotChecked=0, Total=16770 [2021-11-03 05:09:06,033 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 551 states. [2021-11-03 05:09:06,250 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 551 to 75. [2021-11-03 05:09:06,250 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 74 states have (on average 1.2162162162162162) internal successors, (90), 74 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) [2021-11-03 05:09:06,250 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 90 transitions. [2021-11-03 05:09:06,250 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 90 transitions. Word has length 60 [2021-11-03 05:09:06,250 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:09:06,250 INFO L470 AbstractCegarLoop]: Abstraction has 75 states and 90 transitions. [2021-11-03 05:09:06,250 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 54 states, 54 states have (on average 2.1666666666666665) internal successors, (117), 53 states have internal predecessors, (117), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:09:06,251 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 90 transitions. [2021-11-03 05:09:06,251 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-03 05:09:06,251 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:09:06,251 INFO L513 BasicCegarLoop]: trace histogram [14, 13, 13, 9, 4, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:09:06,285 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (113)] Forceful destruction successful, exit code 0 [2021-11-03 05:09:06,453 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 113 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3020 [2021-11-03 05:09:06,453 INFO L402 AbstractCegarLoop]: === Iteration 114 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:09:06,453 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:09:06,453 INFO L85 PathProgramCache]: Analyzing trace with hash 805301266, now seen corresponding path program 75 times [2021-11-03 05:09:06,453 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:09:06,453 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [722003898] [2021-11-03 05:09:06,453 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:09:06,453 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:09:06,490 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:09:06,781 INFO L134 CoverageAnalysis]: Checked inductivity of 315 backedges. 223 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:09:06,781 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:09:06,781 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [722003898] [2021-11-03 05:09:06,781 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [722003898] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 05:09:06,781 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [591146658] [2021-11-03 05:09:06,781 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-03 05:09:06,781 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:09:06,782 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 05:09:06,782 INFO L229 MonitoredProcess]: Starting monitored process 114 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 05:09:06,783 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (114)] Waiting until timeout for monitored process [2021-11-03 05:09:11,244 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-03 05:09:11,244 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 05:09:11,246 INFO L263 TraceCheckSpWp]: Trace formula consists of 246 conjuncts, 32 conjunts are in the unsatisfiable core [2021-11-03 05:09:11,247 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:09:12,012 INFO L134 CoverageAnalysis]: Checked inductivity of 315 backedges. 260 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:09:12,012 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:09:12,192 INFO L134 CoverageAnalysis]: Checked inductivity of 315 backedges. 260 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:09:12,192 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [591146658] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 05:09:12,192 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1848895441] [2021-11-03 05:09:12,193 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-03 05:09:12,193 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 05:09:12,193 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 05:09:12,193 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 05:09:12,193 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 05:09:12,195 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:09:12,195 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:09:12,196 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:09:12,196 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 05:09:12,196 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:09:12,196 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:09:12,196 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 05:09:12,197 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 111 [2021-11-03 05:09:12,199 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_119|], 10=[|v_#valid_120|]} [2021-11-03 05:09:12,203 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:09:12,203 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 [2021-11-03 05:09:12,204 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:09:12,204 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:09:12,204 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:09:12,205 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:09:12,205 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 05:09:12,205 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:12,206 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:09:12,208 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:09:12,209 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:09:12,210 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:09:12,212 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:09:12,213 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 [2021-11-03 05:09:12,213 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:09:12,214 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:09:12,214 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:09:12,215 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:09:12,215 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 05:09:12,215 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:12,216 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:09:12,217 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:09:12,218 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 05:09:12,218 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 05:09:12,218 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:108, output treesize:93 [2021-11-03 05:09:12,221 INFO L180 QuantifierPusher]: treesize reduction 16, result has 87.0 percent of original size [2021-11-03 05:09:12,222 INFO L185 QuantifierPusher]: treesize reduction 7, result has 92.9 percent of original size 91 [2021-11-03 05:09:12,224 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:12,228 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:12,232 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:12,241 INFO L180 QuantifierPusher]: treesize reduction 6, result has 97.7 percent of original size [2021-11-03 05:09:12,243 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 249 [2021-11-03 05:09:12,246 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:12,257 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:12,258 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:12,258 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:12,258 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:12,259 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:12,260 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:12,262 INFO L180 QuantifierPusher]: treesize reduction 24, result has 70.7 percent of original size [2021-11-03 05:09:12,263 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 49 [2021-11-03 05:09:12,265 INFO L180 QuantifierPusher]: treesize reduction 25, result has 71.9 percent of original size [2021-11-03 05:09:12,266 INFO L185 QuantifierPusher]: treesize reduction 5, result has 90.6 percent of original size 48 [2021-11-03 05:09:12,268 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:12,270 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:12,286 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:12,291 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:09:12,292 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 120 [2021-11-03 05:09:12,294 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:12,299 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:12,300 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:12,300 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:12,301 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:12,301 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:12,302 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:12,304 INFO L180 QuantifierPusher]: treesize reduction 24, result has 71.8 percent of original size [2021-11-03 05:09:12,305 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 52 [2021-11-03 05:09:12,308 INFO L180 QuantifierPusher]: treesize reduction 25, result has 78.6 percent of original size [2021-11-03 05:09:12,309 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 87 [2021-11-03 05:09:12,311 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:12,314 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:12,315 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:12,315 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:12,315 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:12,316 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:12,319 INFO L180 QuantifierPusher]: treesize reduction 24, result has 78.2 percent of original size [2021-11-03 05:09:12,320 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 80 [2021-11-03 05:09:12,324 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 05:09:13,039 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 05:09:13,039 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 05:09:13,039 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 52 [2021-11-03 05:09:13,040 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1240743832] [2021-11-03 05:09:13,040 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2021-11-03 05:09:13,040 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:09:13,040 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2021-11-03 05:09:13,040 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=538, Invalid=3122, Unknown=0, NotChecked=0, Total=3660 [2021-11-03 05:09:13,041 INFO L87 Difference]: Start difference. First operand 75 states and 90 transitions. Second operand has 53 states, 53 states have (on average 2.188679245283019) internal successors, (116), 52 states have internal predecessors, (116), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:09:16,287 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:09:16,287 INFO L93 Difference]: Finished difference Result 644 states and 670 transitions. [2021-11-03 05:09:16,287 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2021-11-03 05:09:16,287 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 53 states have (on average 2.188679245283019) internal successors, (116), 52 states have internal predecessors, (116), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 60 [2021-11-03 05:09:16,287 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:09:16,288 INFO L225 Difference]: With dead ends: 644 [2021-11-03 05:09:16,288 INFO L226 Difference]: Without dead ends: 599 [2021-11-03 05:09:16,289 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 272 GetRequests, 149 SyntacticMatches, 0 SemanticMatches, 123 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5314 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=2376, Invalid=13124, Unknown=0, NotChecked=0, Total=15500 [2021-11-03 05:09:16,289 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 599 states. [2021-11-03 05:09:16,518 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 599 to 75. [2021-11-03 05:09:16,518 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 74 states have (on average 1.2162162162162162) internal successors, (90), 74 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) [2021-11-03 05:09:16,518 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 90 transitions. [2021-11-03 05:09:16,518 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 90 transitions. Word has length 60 [2021-11-03 05:09:16,518 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:09:16,518 INFO L470 AbstractCegarLoop]: Abstraction has 75 states and 90 transitions. [2021-11-03 05:09:16,518 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 53 states, 53 states have (on average 2.188679245283019) internal successors, (116), 52 states have internal predecessors, (116), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:09:16,518 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 90 transitions. [2021-11-03 05:09:16,519 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-03 05:09:16,519 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:09:16,519 INFO L513 BasicCegarLoop]: trace histogram [14, 13, 13, 10, 3, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:09:16,553 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (114)] Ended with exit code 0 [2021-11-03 05:09:16,719 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3049,114 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:09:16,719 INFO L402 AbstractCegarLoop]: === Iteration 115 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:09:16,719 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:09:16,719 INFO L85 PathProgramCache]: Analyzing trace with hash -229260191, now seen corresponding path program 76 times [2021-11-03 05:09:16,720 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:09:16,720 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1753035138] [2021-11-03 05:09:16,720 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:09:16,720 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:09:16,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:09:17,051 INFO L134 CoverageAnalysis]: Checked inductivity of 321 backedges. 223 proven. 98 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:09:17,051 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:09:17,051 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1753035138] [2021-11-03 05:09:17,051 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1753035138] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 05:09:17,051 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [154019003] [2021-11-03 05:09:17,051 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-03 05:09:17,051 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:09:17,051 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 05:09:17,052 INFO L229 MonitoredProcess]: Starting monitored process 115 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 05:09:17,053 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (115)] Waiting until timeout for monitored process [2021-11-03 05:09:21,503 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:09:21,504 INFO L263 TraceCheckSpWp]: Trace formula consists of 246 conjuncts, 32 conjunts are in the unsatisfiable core [2021-11-03 05:09:21,505 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:09:22,324 INFO L134 CoverageAnalysis]: Checked inductivity of 321 backedges. 260 proven. 61 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:09:22,324 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:09:22,523 INFO L134 CoverageAnalysis]: Checked inductivity of 321 backedges. 260 proven. 61 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:09:22,523 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [154019003] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 05:09:22,523 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1568085385] [2021-11-03 05:09:22,524 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-03 05:09:22,524 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 05:09:22,524 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 05:09:22,524 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 05:09:22,524 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 05:09:22,527 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:09:22,527 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:09:22,528 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:09:22,528 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 05:09:22,528 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:09:22,528 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:09:22,528 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 05:09:22,529 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 111 [2021-11-03 05:09:22,530 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_120|], 10=[|v_#valid_121|]} [2021-11-03 05:09:22,534 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:09:22,535 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 [2021-11-03 05:09:22,535 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:09:22,535 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:09:22,535 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:09:22,536 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:09:22,536 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 05:09:22,536 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:22,537 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:09:22,539 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:09:22,540 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:09:22,541 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:09:22,543 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:09:22,544 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 [2021-11-03 05:09:22,544 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:09:22,545 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:09:22,545 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:09:22,546 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:09:22,546 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 05:09:22,546 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:22,547 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:09:22,548 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:09:22,548 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 05:09:22,549 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 05:09:22,549 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:108, output treesize:93 [2021-11-03 05:09:22,552 INFO L180 QuantifierPusher]: treesize reduction 16, result has 87.0 percent of original size [2021-11-03 05:09:22,553 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 102 [2021-11-03 05:09:22,554 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:22,558 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:22,562 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:22,571 INFO L180 QuantifierPusher]: treesize reduction 6, result has 97.7 percent of original size [2021-11-03 05:09:22,573 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 251 [2021-11-03 05:09:22,576 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:22,586 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:22,587 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:22,587 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:22,587 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:22,588 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:22,589 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:22,591 INFO L180 QuantifierPusher]: treesize reduction 24, result has 70.7 percent of original size [2021-11-03 05:09:22,592 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 49 [2021-11-03 05:09:22,594 INFO L180 QuantifierPusher]: treesize reduction 25, result has 71.9 percent of original size [2021-11-03 05:09:22,595 INFO L185 QuantifierPusher]: treesize reduction 5, result has 90.6 percent of original size 48 [2021-11-03 05:09:22,596 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:22,599 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:22,601 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:22,606 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:09:22,608 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 120 [2021-11-03 05:09:22,609 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:22,614 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:22,615 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:22,615 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:22,616 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:22,616 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:22,617 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:22,619 INFO L180 QuantifierPusher]: treesize reduction 24, result has 71.8 percent of original size [2021-11-03 05:09:22,620 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 52 [2021-11-03 05:09:22,623 INFO L180 QuantifierPusher]: treesize reduction 25, result has 78.6 percent of original size [2021-11-03 05:09:22,624 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 90 [2021-11-03 05:09:22,625 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:22,629 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:22,629 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:22,630 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:22,630 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:22,631 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:22,633 INFO L180 QuantifierPusher]: treesize reduction 24, result has 78.2 percent of original size [2021-11-03 05:09:22,635 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 80 [2021-11-03 05:09:22,638 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 05:09:23,347 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 05:09:23,347 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 05:09:23,348 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 51 [2021-11-03 05:09:23,348 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [387295791] [2021-11-03 05:09:23,348 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2021-11-03 05:09:23,348 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:09:23,348 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2021-11-03 05:09:23,348 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=534, Invalid=3006, Unknown=0, NotChecked=0, Total=3540 [2021-11-03 05:09:23,349 INFO L87 Difference]: Start difference. First operand 75 states and 90 transitions. Second operand has 52 states, 52 states have (on average 2.2115384615384617) internal successors, (115), 51 states have internal predecessors, (115), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:09:26,503 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:09:26,503 INFO L93 Difference]: Finished difference Result 691 states and 718 transitions. [2021-11-03 05:09:26,503 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2021-11-03 05:09:26,504 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 52 states have (on average 2.2115384615384617) internal successors, (115), 51 states have internal predecessors, (115), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 60 [2021-11-03 05:09:26,504 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:09:26,505 INFO L225 Difference]: With dead ends: 691 [2021-11-03 05:09:26,505 INFO L226 Difference]: Without dead ends: 646 [2021-11-03 05:09:26,506 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 266 GetRequests, 150 SyntacticMatches, 0 SemanticMatches, 116 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4627 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=2110, Invalid=11696, Unknown=0, NotChecked=0, Total=13806 [2021-11-03 05:09:26,507 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 646 states. [2021-11-03 05:09:26,740 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 646 to 75. [2021-11-03 05:09:26,740 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 74 states have (on average 1.2162162162162162) internal successors, (90), 74 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) [2021-11-03 05:09:26,741 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 90 transitions. [2021-11-03 05:09:26,741 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 90 transitions. Word has length 60 [2021-11-03 05:09:26,741 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:09:26,741 INFO L470 AbstractCegarLoop]: Abstraction has 75 states and 90 transitions. [2021-11-03 05:09:26,741 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 52 states, 52 states have (on average 2.2115384615384617) internal successors, (115), 51 states have internal predecessors, (115), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:09:26,741 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 90 transitions. [2021-11-03 05:09:26,741 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-03 05:09:26,741 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:09:26,741 INFO L513 BasicCegarLoop]: trace histogram [14, 13, 13, 11, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:09:26,774 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (115)] Ended with exit code 0 [2021-11-03 05:09:26,942 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 115 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3078 [2021-11-03 05:09:26,942 INFO L402 AbstractCegarLoop]: === Iteration 116 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:09:26,942 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:09:26,942 INFO L85 PathProgramCache]: Analyzing trace with hash -1093917134, now seen corresponding path program 77 times [2021-11-03 05:09:26,942 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:09:26,942 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [128743023] [2021-11-03 05:09:26,942 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:09:26,943 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:09:26,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:09:27,391 INFO L134 CoverageAnalysis]: Checked inductivity of 329 backedges. 223 proven. 106 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:09:27,391 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:09:27,391 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [128743023] [2021-11-03 05:09:27,391 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [128743023] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 05:09:27,391 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2043290860] [2021-11-03 05:09:27,391 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-03 05:09:27,391 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:09:27,391 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 05:09:27,392 INFO L229 MonitoredProcess]: Starting monitored process 116 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 05:09:27,393 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (116)] Waiting until timeout for monitored process [2021-11-03 05:09:31,951 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2021-11-03 05:09:31,951 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 05:09:31,953 INFO L263 TraceCheckSpWp]: Trace formula consists of 246 conjuncts, 32 conjunts are in the unsatisfiable core [2021-11-03 05:09:31,953 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:09:32,681 INFO L134 CoverageAnalysis]: Checked inductivity of 329 backedges. 260 proven. 69 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:09:32,682 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:09:32,860 INFO L134 CoverageAnalysis]: Checked inductivity of 329 backedges. 260 proven. 69 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:09:32,861 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2043290860] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 05:09:32,861 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1760140894] [2021-11-03 05:09:32,861 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-03 05:09:32,861 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 05:09:32,862 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 05:09:32,862 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 05:09:32,862 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 05:09:32,863 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:09:32,864 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:09:32,864 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:09:32,864 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 05:09:32,864 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:09:32,865 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:09:32,865 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 05:09:32,865 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 111 [2021-11-03 05:09:32,867 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_121|], 10=[|v_#valid_122|]} [2021-11-03 05:09:32,871 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:09:32,871 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 [2021-11-03 05:09:32,871 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:09:32,872 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:09:32,872 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:09:32,872 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:09:32,872 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 05:09:32,873 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:32,874 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:09:32,876 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:09:32,877 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:09:32,877 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:09:32,880 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:09:32,881 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 [2021-11-03 05:09:32,881 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:09:32,882 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:09:32,882 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:09:32,883 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:09:32,883 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 05:09:32,883 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:32,884 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:09:32,885 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:09:32,885 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 05:09:32,886 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 05:09:32,886 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:108, output treesize:93 [2021-11-03 05:09:32,889 INFO L180 QuantifierPusher]: treesize reduction 16, result has 87.0 percent of original size [2021-11-03 05:09:32,890 INFO L185 QuantifierPusher]: treesize reduction 7, result has 92.9 percent of original size 91 [2021-11-03 05:09:32,892 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:32,895 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:32,899 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:32,908 INFO L180 QuantifierPusher]: treesize reduction 6, result has 97.7 percent of original size [2021-11-03 05:09:32,911 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 249 [2021-11-03 05:09:32,913 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:32,925 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:32,925 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:32,926 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:32,926 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:32,926 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:32,928 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:32,929 INFO L180 QuantifierPusher]: treesize reduction 24, result has 70.7 percent of original size [2021-11-03 05:09:32,930 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 49 [2021-11-03 05:09:32,933 INFO L180 QuantifierPusher]: treesize reduction 25, result has 71.9 percent of original size [2021-11-03 05:09:32,934 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 57 [2021-11-03 05:09:32,935 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:32,938 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:32,940 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:32,945 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:09:32,947 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 122 [2021-11-03 05:09:32,948 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:32,954 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:32,954 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:32,955 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:32,955 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:32,955 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:32,956 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:32,958 INFO L180 QuantifierPusher]: treesize reduction 24, result has 71.8 percent of original size [2021-11-03 05:09:32,959 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 52 [2021-11-03 05:09:32,962 INFO L180 QuantifierPusher]: treesize reduction 25, result has 78.6 percent of original size [2021-11-03 05:09:32,964 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 90 [2021-11-03 05:09:32,965 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:32,969 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:32,969 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:32,969 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:32,970 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:32,971 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:32,973 INFO L180 QuantifierPusher]: treesize reduction 24, result has 78.2 percent of original size [2021-11-03 05:09:32,975 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 80 [2021-11-03 05:09:32,978 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 05:09:33,689 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 05:09:33,689 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 05:09:33,689 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 50 [2021-11-03 05:09:33,689 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [732367111] [2021-11-03 05:09:33,689 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2021-11-03 05:09:33,690 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:09:33,690 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2021-11-03 05:09:33,690 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=534, Invalid=2888, Unknown=0, NotChecked=0, Total=3422 [2021-11-03 05:09:33,690 INFO L87 Difference]: Start difference. First operand 75 states and 90 transitions. Second operand has 51 states, 51 states have (on average 2.235294117647059) internal successors, (114), 50 states have internal predecessors, (114), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:09:36,872 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:09:36,872 INFO L93 Difference]: Finished difference Result 737 states and 765 transitions. [2021-11-03 05:09:36,873 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2021-11-03 05:09:36,873 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 2.235294117647059) internal successors, (114), 50 states have internal predecessors, (114), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 60 [2021-11-03 05:09:36,873 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:09:36,874 INFO L225 Difference]: With dead ends: 737 [2021-11-03 05:09:36,874 INFO L226 Difference]: Without dead ends: 692 [2021-11-03 05:09:36,874 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 258 GetRequests, 151 SyntacticMatches, 0 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3815 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=1804, Invalid=9968, Unknown=0, NotChecked=0, Total=11772 [2021-11-03 05:09:36,875 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 692 states. [2021-11-03 05:09:37,101 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 692 to 75. [2021-11-03 05:09:37,102 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 74 states have (on average 1.2162162162162162) internal successors, (90), 74 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) [2021-11-03 05:09:37,102 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 90 transitions. [2021-11-03 05:09:37,102 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 90 transitions. Word has length 60 [2021-11-03 05:09:37,102 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:09:37,102 INFO L470 AbstractCegarLoop]: Abstraction has 75 states and 90 transitions. [2021-11-03 05:09:37,102 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 51 states have (on average 2.235294117647059) internal successors, (114), 50 states have internal predecessors, (114), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:09:37,102 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 90 transitions. [2021-11-03 05:09:37,102 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-03 05:09:37,102 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:09:37,103 INFO L513 BasicCegarLoop]: trace histogram [14, 13, 13, 12, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:09:37,139 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (116)] Ended with exit code 0 [2021-11-03 05:09:37,303 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3107,116 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:09:37,303 INFO L402 AbstractCegarLoop]: === Iteration 117 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:09:37,303 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:09:37,303 INFO L85 PathProgramCache]: Analyzing trace with hash 1510590017, now seen corresponding path program 78 times [2021-11-03 05:09:37,303 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:09:37,303 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1398208853] [2021-11-03 05:09:37,304 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:09:37,304 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:09:37,341 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:09:37,640 INFO L134 CoverageAnalysis]: Checked inductivity of 339 backedges. 223 proven. 116 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:09:37,640 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:09:37,640 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1398208853] [2021-11-03 05:09:37,641 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1398208853] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 05:09:37,641 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [347331859] [2021-11-03 05:09:37,641 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-03 05:09:37,641 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:09:37,641 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 05:09:37,641 INFO L229 MonitoredProcess]: Starting monitored process 117 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 05:09:37,642 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (117)] Waiting until timeout for monitored process [2021-11-03 05:09:42,276 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-03 05:09:42,276 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 05:09:42,277 INFO L263 TraceCheckSpWp]: Trace formula consists of 246 conjuncts, 32 conjunts are in the unsatisfiable core [2021-11-03 05:09:42,278 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:09:42,987 INFO L134 CoverageAnalysis]: Checked inductivity of 339 backedges. 260 proven. 79 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:09:42,987 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:09:43,174 INFO L134 CoverageAnalysis]: Checked inductivity of 339 backedges. 260 proven. 79 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:09:43,174 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [347331859] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 05:09:43,174 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [309556076] [2021-11-03 05:09:43,175 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-03 05:09:43,175 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 05:09:43,176 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 05:09:43,176 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 05:09:43,176 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 05:09:43,178 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:09:43,179 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:09:43,179 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:09:43,180 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 05:09:43,180 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:09:43,182 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:09:43,182 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 05:09:43,183 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 111 [2021-11-03 05:09:43,185 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_122|], 10=[|v_#valid_123|]} [2021-11-03 05:09:43,190 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:09:43,191 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 [2021-11-03 05:09:43,192 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:09:43,192 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:09:43,192 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:09:43,193 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:09:43,193 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 05:09:43,193 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:43,195 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:09:43,198 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:09:43,199 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:09:43,200 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:09:43,203 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:09:43,204 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 [2021-11-03 05:09:43,204 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:09:43,206 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:09:43,206 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:09:43,207 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:09:43,207 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 05:09:43,207 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:43,209 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:09:43,210 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:09:43,211 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 05:09:43,211 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 05:09:43,211 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:108, output treesize:93 [2021-11-03 05:09:43,216 INFO L180 QuantifierPusher]: treesize reduction 16, result has 87.0 percent of original size [2021-11-03 05:09:43,217 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 100 [2021-11-03 05:09:43,218 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:43,222 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:43,226 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:43,235 INFO L180 QuantifierPusher]: treesize reduction 11, result has 95.8 percent of original size [2021-11-03 05:09:43,237 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 251 [2021-11-03 05:09:43,240 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:43,250 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:43,251 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:43,251 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:43,252 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:43,252 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:43,253 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:43,255 INFO L180 QuantifierPusher]: treesize reduction 24, result has 70.7 percent of original size [2021-11-03 05:09:43,256 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 49 [2021-11-03 05:09:43,259 INFO L180 QuantifierPusher]: treesize reduction 25, result has 71.9 percent of original size [2021-11-03 05:09:43,259 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 57 [2021-11-03 05:09:43,261 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:43,263 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:43,266 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:43,271 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:09:43,272 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 122 [2021-11-03 05:09:43,274 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:43,279 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:43,280 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:43,280 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:43,281 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:43,281 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:43,282 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:43,284 INFO L180 QuantifierPusher]: treesize reduction 24, result has 71.8 percent of original size [2021-11-03 05:09:43,285 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 52 [2021-11-03 05:09:43,288 INFO L180 QuantifierPusher]: treesize reduction 25, result has 78.6 percent of original size [2021-11-03 05:09:43,289 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 90 [2021-11-03 05:09:43,290 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:43,294 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:43,294 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:43,295 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:43,295 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:43,296 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:43,298 INFO L180 QuantifierPusher]: treesize reduction 24, result has 78.2 percent of original size [2021-11-03 05:09:43,300 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 80 [2021-11-03 05:09:43,303 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 05:09:44,010 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 05:09:44,010 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 05:09:44,010 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 49 [2021-11-03 05:09:44,011 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [583573335] [2021-11-03 05:09:44,011 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2021-11-03 05:09:44,011 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:09:44,011 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-11-03 05:09:44,011 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=538, Invalid=2768, Unknown=0, NotChecked=0, Total=3306 [2021-11-03 05:09:44,011 INFO L87 Difference]: Start difference. First operand 75 states and 90 transitions. Second operand has 50 states, 50 states have (on average 2.26) internal successors, (113), 49 states have internal predecessors, (113), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:09:47,134 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:09:47,134 INFO L93 Difference]: Finished difference Result 782 states and 811 transitions. [2021-11-03 05:09:47,134 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2021-11-03 05:09:47,134 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 2.26) internal successors, (113), 49 states have internal predecessors, (113), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 60 [2021-11-03 05:09:47,134 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:09:47,135 INFO L225 Difference]: With dead ends: 782 [2021-11-03 05:09:47,135 INFO L226 Difference]: Without dead ends: 737 [2021-11-03 05:09:47,136 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 248 GetRequests, 152 SyntacticMatches, 0 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2901 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=1485, Invalid=8021, Unknown=0, NotChecked=0, Total=9506 [2021-11-03 05:09:47,137 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 737 states. [2021-11-03 05:09:47,380 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 737 to 75. [2021-11-03 05:09:47,380 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 74 states have (on average 1.2162162162162162) internal successors, (90), 74 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) [2021-11-03 05:09:47,380 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 90 transitions. [2021-11-03 05:09:47,380 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 90 transitions. Word has length 60 [2021-11-03 05:09:47,380 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:09:47,380 INFO L470 AbstractCegarLoop]: Abstraction has 75 states and 90 transitions. [2021-11-03 05:09:47,380 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 50 states have (on average 2.26) internal successors, (113), 49 states have internal predecessors, (113), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:09:47,380 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 90 transitions. [2021-11-03 05:09:47,381 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-03 05:09:47,381 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:09:47,381 INFO L513 BasicCegarLoop]: trace histogram [14, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:09:47,416 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (117)] Forceful destruction successful, exit code 0 [2021-11-03 05:09:47,581 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3136,117 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:09:47,581 INFO L402 AbstractCegarLoop]: === Iteration 118 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:09:47,581 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:09:47,581 INFO L85 PathProgramCache]: Analyzing trace with hash -1314887598, now seen corresponding path program 13 times [2021-11-03 05:09:47,582 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:09:47,582 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1450009968] [2021-11-03 05:09:47,582 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:09:47,582 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:09:47,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:09:47,922 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 223 proven. 128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:09:47,922 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:09:47,922 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1450009968] [2021-11-03 05:09:47,922 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1450009968] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 05:09:47,922 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [556854396] [2021-11-03 05:09:47,923 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-03 05:09:47,923 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:09:47,923 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 05:09:47,923 INFO L229 MonitoredProcess]: Starting monitored process 118 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 05:09:47,924 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (118)] Waiting until timeout for monitored process [2021-11-03 05:09:52,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:09:52,546 INFO L263 TraceCheckSpWp]: Trace formula consists of 246 conjuncts, 32 conjunts are in the unsatisfiable core [2021-11-03 05:09:52,547 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:09:53,245 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 260 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:09:53,245 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:09:53,424 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 260 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:09:53,424 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [556854396] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 05:09:53,424 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1058028945] [2021-11-03 05:09:53,424 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-03 05:09:53,425 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 05:09:53,425 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 05:09:53,425 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 05:09:53,425 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 05:09:53,426 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:09:53,427 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:09:53,427 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:09:53,427 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 05:09:53,428 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:09:53,431 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:09:53,432 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 05:09:53,432 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 111 [2021-11-03 05:09:53,433 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_123|], 10=[|v_#valid_124|]} [2021-11-03 05:09:53,437 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:09:53,438 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 [2021-11-03 05:09:53,438 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:09:53,439 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:09:53,439 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:09:53,439 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:09:53,439 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 05:09:53,439 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:53,441 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:09:53,443 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:09:53,444 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:09:53,444 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:09:53,447 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:09:53,447 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 [2021-11-03 05:09:53,448 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:09:53,449 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:09:53,449 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:09:53,449 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:09:53,449 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 05:09:53,450 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:53,451 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:09:53,452 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:09:53,452 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 05:09:53,452 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 05:09:53,452 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:108, output treesize:93 [2021-11-03 05:09:53,456 INFO L180 QuantifierPusher]: treesize reduction 16, result has 87.0 percent of original size [2021-11-03 05:09:53,457 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 100 [2021-11-03 05:09:53,458 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:53,462 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:53,466 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:53,475 INFO L180 QuantifierPusher]: treesize reduction 11, result has 95.8 percent of original size [2021-11-03 05:09:53,478 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 251 [2021-11-03 05:09:53,480 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:53,491 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:53,491 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:53,492 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:53,492 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:53,493 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:53,494 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:53,496 INFO L180 QuantifierPusher]: treesize reduction 24, result has 70.7 percent of original size [2021-11-03 05:09:53,497 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 49 [2021-11-03 05:09:53,501 INFO L180 QuantifierPusher]: treesize reduction 26, result has 78.5 percent of original size [2021-11-03 05:09:53,502 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 05:09:53,503 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:53,590 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:53,591 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:53,591 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:53,592 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:53,593 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:09:53,596 INFO L180 QuantifierPusher]: treesize reduction 30, result has 74.1 percent of original size [2021-11-03 05:09:53,597 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 80 [2021-11-03 05:09:53,601 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 05:09:54,341 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 05:09:54,342 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 05:09:54,342 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 48 [2021-11-03 05:09:54,342 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [23427845] [2021-11-03 05:09:54,342 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2021-11-03 05:09:54,342 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:09:54,342 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-11-03 05:09:54,343 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=545, Invalid=2647, Unknown=0, NotChecked=0, Total=3192 [2021-11-03 05:09:54,343 INFO L87 Difference]: Start difference. First operand 75 states and 90 transitions. Second operand has 49 states, 49 states have (on average 2.2653061224489797) internal successors, (111), 48 states have internal predecessors, (111), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:09:57,387 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:09:57,387 INFO L93 Difference]: Finished difference Result 828 states and 859 transitions. [2021-11-03 05:09:57,387 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2021-11-03 05:09:57,387 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 2.2653061224489797) internal successors, (111), 48 states have internal predecessors, (111), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 60 [2021-11-03 05:09:57,387 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:09:57,388 INFO L225 Difference]: With dead ends: 828 [2021-11-03 05:09:57,388 INFO L226 Difference]: Without dead ends: 783 [2021-11-03 05:09:57,388 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 236 GetRequests, 153 SyntacticMatches, 0 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2021 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1199, Invalid=5941, Unknown=0, NotChecked=0, Total=7140 [2021-11-03 05:09:57,389 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 783 states. [2021-11-03 05:09:57,636 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 783 to 76. [2021-11-03 05:09:57,636 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 75 states have (on average 1.2266666666666666) internal successors, (92), 75 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) [2021-11-03 05:09:57,637 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 92 transitions. [2021-11-03 05:09:57,637 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 92 transitions. Word has length 60 [2021-11-03 05:09:57,637 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:09:57,637 INFO L470 AbstractCegarLoop]: Abstraction has 76 states and 92 transitions. [2021-11-03 05:09:57,637 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 49 states have (on average 2.2653061224489797) internal successors, (111), 48 states have internal predecessors, (111), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:09:57,637 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 92 transitions. [2021-11-03 05:09:57,637 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-11-03 05:09:57,637 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:09:57,637 INFO L513 BasicCegarLoop]: trace histogram [14, 14, 13, 13, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:09:57,671 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (118)] Forceful destruction successful, exit code 0 [2021-11-03 05:09:57,838 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 118 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3165 [2021-11-03 05:09:57,838 INFO L402 AbstractCegarLoop]: === Iteration 119 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:09:57,838 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:09:57,838 INFO L85 PathProgramCache]: Analyzing trace with hash 173062277, now seen corresponding path program 26 times [2021-11-03 05:09:57,838 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:09:57,838 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1495016625] [2021-11-03 05:09:57,838 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:09:57,838 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:09:57,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:09:58,011 INFO L134 CoverageAnalysis]: Checked inductivity of 365 backedges. 91 proven. 274 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:09:58,011 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:09:58,011 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1495016625] [2021-11-03 05:09:58,011 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1495016625] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 05:09:58,011 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [737517765] [2021-11-03 05:09:58,011 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-03 05:09:58,011 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:09:58,012 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 05:09:58,016 INFO L229 MonitoredProcess]: Starting monitored process 119 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 05:09:58,016 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (119)] Waiting until timeout for monitored process [2021-11-03 05:10:02,712 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2021-11-03 05:10:02,713 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 05:10:02,714 INFO L263 TraceCheckSpWp]: Trace formula consists of 251 conjuncts, 31 conjunts are in the unsatisfiable core [2021-11-03 05:10:02,715 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:10:02,947 INFO L134 CoverageAnalysis]: Checked inductivity of 365 backedges. 105 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:10:02,947 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:10:03,098 INFO L134 CoverageAnalysis]: Checked inductivity of 365 backedges. 105 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:10:03,098 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [737517765] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 05:10:03,098 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [28721052] [2021-11-03 05:10:03,099 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-03 05:10:03,099 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 05:10:03,099 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 05:10:03,100 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 05:10:03,100 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 05:10:03,104 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:10:03,105 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:10:03,105 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:10:03,105 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 05:10:03,105 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:10:03,106 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:10:03,106 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 05:10:03,107 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 111 [2021-11-03 05:10:03,112 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_124|], 10=[|v_#valid_125|]} [2021-11-03 05:10:03,121 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:10:03,122 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 [2021-11-03 05:10:03,122 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:10:03,122 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:10:03,123 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:10:03,123 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:10:03,123 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 05:10:03,123 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:03,125 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:10:03,127 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:10:03,128 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:10:03,128 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:10:03,131 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:10:03,131 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 [2021-11-03 05:10:03,132 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:10:03,133 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:10:03,133 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:10:03,133 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:10:03,133 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 05:10:03,134 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:03,135 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:10:03,135 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:10:03,136 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 05:10:03,136 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 05:10:03,136 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:108, output treesize:93 [2021-11-03 05:10:03,140 INFO L180 QuantifierPusher]: treesize reduction 17, result has 86.9 percent of original size [2021-11-03 05:10:03,142 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 108 [2021-11-03 05:10:03,143 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:03,148 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:03,152 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:03,162 INFO L180 QuantifierPusher]: treesize reduction 17, result has 94.1 percent of original size [2021-11-03 05:10:03,164 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 269 [2021-11-03 05:10:03,167 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:03,179 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:03,179 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:03,180 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:03,180 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:03,181 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:03,182 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:03,184 INFO L180 QuantifierPusher]: treesize reduction 30, result has 67.0 percent of original size [2021-11-03 05:10:03,185 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 52 [2021-11-03 05:10:03,188 INFO L180 QuantifierPusher]: treesize reduction 31, result has 74.8 percent of original size [2021-11-03 05:10:03,190 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 90 [2021-11-03 05:10:03,191 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:03,195 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:03,195 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:03,196 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:03,196 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:03,197 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:03,200 INFO L180 QuantifierPusher]: treesize reduction 30, result has 74.1 percent of original size [2021-11-03 05:10:03,201 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 80 [2021-11-03 05:10:03,205 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 05:10:03,827 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 05:10:03,827 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 05:10:03,827 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 19 [2021-11-03 05:10:03,827 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [957690119] [2021-11-03 05:10:03,828 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-03 05:10:03,828 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:10:03,828 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-03 05:10:03,828 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=180, Invalid=576, Unknown=0, NotChecked=0, Total=756 [2021-11-03 05:10:03,828 INFO L87 Difference]: Start difference. First operand 76 states and 92 transitions. Second operand has 20 states, 20 states have (on average 3.4) internal successors, (68), 19 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) [2021-11-03 05:10:04,381 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:10:04,381 INFO L93 Difference]: Finished difference Result 87 states and 103 transitions. [2021-11-03 05:10:04,382 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-11-03 05:10:04,382 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 3.4) internal successors, (68), 19 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) Word has length 61 [2021-11-03 05:10:04,382 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:10:04,382 INFO L225 Difference]: With dead ends: 87 [2021-11-03 05:10:04,382 INFO L226 Difference]: Without dead ends: 85 [2021-11-03 05:10:04,382 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 227 GetRequests, 183 SyntacticMatches, 2 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 524 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=487, Invalid=1405, Unknown=0, NotChecked=0, Total=1892 [2021-11-03 05:10:04,382 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2021-11-03 05:10:04,626 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 79. [2021-11-03 05:10:04,626 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 78 states have (on average 1.2179487179487178) internal successors, (95), 78 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) [2021-11-03 05:10:04,626 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 95 transitions. [2021-11-03 05:10:04,626 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 95 transitions. Word has length 61 [2021-11-03 05:10:04,626 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:10:04,627 INFO L470 AbstractCegarLoop]: Abstraction has 79 states and 95 transitions. [2021-11-03 05:10:04,627 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 3.4) internal successors, (68), 19 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) [2021-11-03 05:10:04,627 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 95 transitions. [2021-11-03 05:10:04,627 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-03 05:10:04,627 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:10:04,628 INFO L513 BasicCegarLoop]: trace histogram [15, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:10:04,663 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (119)] Forceful destruction successful, exit code 0 [2021-11-03 05:10:04,828 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 119 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3184 [2021-11-03 05:10:04,828 INFO L402 AbstractCegarLoop]: === Iteration 120 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:10:04,828 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:10:04,828 INFO L85 PathProgramCache]: Analyzing trace with hash 1742382027, now seen corresponding path program 27 times [2021-11-03 05:10:04,828 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:10:04,829 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2138474101] [2021-11-03 05:10:04,829 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:10:04,829 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:10:04,867 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:10:05,286 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 261 proven. 145 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:10:05,287 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:10:05,287 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2138474101] [2021-11-03 05:10:05,287 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2138474101] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 05:10:05,287 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1791997127] [2021-11-03 05:10:05,287 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-03 05:10:05,287 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:10:05,288 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 05:10:05,296 INFO L229 MonitoredProcess]: Starting monitored process 120 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 05:10:05,297 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (120)] Waiting until timeout for monitored process [2021-11-03 05:10:10,012 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-03 05:10:10,012 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 05:10:10,014 INFO L263 TraceCheckSpWp]: Trace formula consists of 261 conjuncts, 34 conjunts are in the unsatisfiable core [2021-11-03 05:10:10,015 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:10:11,079 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 301 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:10:11,080 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:10:11,286 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 301 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:10:11,286 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1791997127] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 05:10:11,286 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [48077767] [2021-11-03 05:10:11,287 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-03 05:10:11,287 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 05:10:11,287 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 05:10:11,287 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 05:10:11,287 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 05:10:11,289 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:10:11,289 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:10:11,289 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:10:11,290 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 05:10:11,290 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:10:11,290 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:10:11,290 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 05:10:11,291 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 111 [2021-11-03 05:10:11,292 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_125|], 10=[|v_#valid_126|]} [2021-11-03 05:10:11,296 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:10:11,296 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 [2021-11-03 05:10:11,297 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:10:11,297 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:10:11,297 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:10:11,298 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:10:11,298 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 05:10:11,298 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:11,299 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:10:11,301 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:10:11,302 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:10:11,303 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:10:11,305 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:10:11,306 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 [2021-11-03 05:10:11,306 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:10:11,307 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:10:11,307 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:10:11,307 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:10:11,308 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 05:10:11,308 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:11,309 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:10:11,310 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:10:11,310 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 05:10:11,310 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 05:10:11,310 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:108, output treesize:93 [2021-11-03 05:10:11,314 INFO L180 QuantifierPusher]: treesize reduction 17, result has 86.9 percent of original size [2021-11-03 05:10:11,316 INFO L185 QuantifierPusher]: treesize reduction 5, result has 95.1 percent of original size 97 [2021-11-03 05:10:11,317 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:11,321 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:11,326 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:11,336 INFO L180 QuantifierPusher]: treesize reduction 12, result has 95.7 percent of original size [2021-11-03 05:10:11,338 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 267 [2021-11-03 05:10:11,341 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:11,355 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:11,356 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:11,356 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:11,357 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:11,357 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:11,358 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:11,361 INFO L180 QuantifierPusher]: treesize reduction 30, result has 67.0 percent of original size [2021-11-03 05:10:11,361 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 52 [2021-11-03 05:10:11,364 INFO L180 QuantifierPusher]: treesize reduction 31, result has 74.8 percent of original size [2021-11-03 05:10:11,366 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 90 [2021-11-03 05:10:11,367 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:11,371 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:11,371 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:11,372 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:11,381 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:11,382 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:11,387 INFO L180 QuantifierPusher]: treesize reduction 30, result has 74.1 percent of original size [2021-11-03 05:10:11,388 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 80 [2021-11-03 05:10:11,393 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 05:10:12,271 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 05:10:12,271 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 05:10:12,271 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 65 [2021-11-03 05:10:12,271 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1486777656] [2021-11-03 05:10:12,271 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 66 states [2021-11-03 05:10:12,271 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:10:12,272 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2021-11-03 05:10:12,272 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=862, Invalid=4540, Unknown=0, NotChecked=0, Total=5402 [2021-11-03 05:10:12,272 INFO L87 Difference]: Start difference. First operand 79 states and 95 transitions. Second operand has 66 states, 66 states have (on average 2.0) internal successors, (132), 65 states have internal predecessors, (132), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:10:13,645 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:10:13,645 INFO L93 Difference]: Finished difference Result 188 states and 206 transitions. [2021-11-03 05:10:13,645 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-11-03 05:10:13,646 INFO L78 Accepts]: Start accepts. Automaton has has 66 states, 66 states have (on average 2.0) internal successors, (132), 65 states have internal predecessors, (132), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 64 [2021-11-03 05:10:13,646 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:10:13,646 INFO L225 Difference]: With dead ends: 188 [2021-11-03 05:10:13,646 INFO L226 Difference]: Without dead ends: 140 [2021-11-03 05:10:13,647 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 252 GetRequests, 150 SyntacticMatches, 0 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3793 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=1705, Invalid=9007, Unknown=0, NotChecked=0, Total=10712 [2021-11-03 05:10:13,647 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 140 states. [2021-11-03 05:10:13,892 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 140 to 80. [2021-11-03 05:10:13,892 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 79 states have (on average 1.2151898734177216) internal successors, (96), 79 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) [2021-11-03 05:10:13,892 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 96 transitions. [2021-11-03 05:10:13,893 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 96 transitions. Word has length 64 [2021-11-03 05:10:13,893 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:10:13,893 INFO L470 AbstractCegarLoop]: Abstraction has 80 states and 96 transitions. [2021-11-03 05:10:13,893 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 66 states, 66 states have (on average 2.0) internal successors, (132), 65 states have internal predecessors, (132), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:10:13,893 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 96 transitions. [2021-11-03 05:10:13,893 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-03 05:10:13,893 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:10:13,893 INFO L513 BasicCegarLoop]: trace histogram [15, 14, 14, 13, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:10:13,928 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (120)] Ended with exit code 0 [2021-11-03 05:10:14,097 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3203,120 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:10:14,097 INFO L402 AbstractCegarLoop]: === Iteration 121 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:10:14,097 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:10:14,097 INFO L85 PathProgramCache]: Analyzing trace with hash -1389034532, now seen corresponding path program 79 times [2021-11-03 05:10:14,097 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:10:14,097 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1694039025] [2021-11-03 05:10:14,097 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:10:14,097 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:10:14,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:10:14,534 INFO L134 CoverageAnalysis]: Checked inductivity of 393 backedges. 261 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:10:14,534 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:10:14,534 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1694039025] [2021-11-03 05:10:14,534 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1694039025] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 05:10:14,534 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2121165739] [2021-11-03 05:10:14,534 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-03 05:10:14,534 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:10:14,534 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 05:10:14,535 INFO L229 MonitoredProcess]: Starting monitored process 121 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 05:10:14,535 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (121)] Waiting until timeout for monitored process [2021-11-03 05:10:19,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:10:19,290 INFO L263 TraceCheckSpWp]: Trace formula consists of 261 conjuncts, 34 conjunts are in the unsatisfiable core [2021-11-03 05:10:19,291 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:10:20,360 INFO L134 CoverageAnalysis]: Checked inductivity of 393 backedges. 301 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:10:20,361 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:10:20,557 INFO L134 CoverageAnalysis]: Checked inductivity of 393 backedges. 301 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:10:20,558 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2121165739] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 05:10:20,558 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [353620670] [2021-11-03 05:10:20,559 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-03 05:10:20,559 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 05:10:20,559 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 05:10:20,559 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 05:10:20,559 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 05:10:20,565 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:10:20,565 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:10:20,565 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:10:20,565 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 05:10:20,566 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:10:20,566 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:10:20,566 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 05:10:20,567 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 111 [2021-11-03 05:10:20,568 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_126|], 10=[|v_#valid_127|]} [2021-11-03 05:10:20,572 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:10:20,572 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 [2021-11-03 05:10:20,573 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:10:20,573 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:10:20,573 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:10:20,574 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:10:20,574 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 05:10:20,574 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:20,575 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:10:20,577 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:10:20,578 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:10:20,579 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:10:20,581 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:10:20,582 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 [2021-11-03 05:10:20,582 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:10:20,583 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:10:20,583 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:10:20,584 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:10:20,584 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 05:10:20,584 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:20,585 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:10:20,586 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:10:20,586 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 05:10:20,586 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 05:10:20,587 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:108, output treesize:93 [2021-11-03 05:10:20,590 INFO L180 QuantifierPusher]: treesize reduction 16, result has 87.0 percent of original size [2021-11-03 05:10:20,591 INFO L185 QuantifierPusher]: treesize reduction 5, result has 94.8 percent of original size 91 [2021-11-03 05:10:20,592 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:20,596 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:20,600 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:20,609 INFO L180 QuantifierPusher]: treesize reduction 6, result has 97.7 percent of original size [2021-11-03 05:10:20,612 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 249 [2021-11-03 05:10:20,614 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:20,626 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:20,626 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:20,627 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:20,627 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:20,627 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:20,629 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:20,630 INFO L180 QuantifierPusher]: treesize reduction 24, result has 70.7 percent of original size [2021-11-03 05:10:20,631 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 49 [2021-11-03 05:10:20,634 INFO L180 QuantifierPusher]: treesize reduction 25, result has 71.9 percent of original size [2021-11-03 05:10:20,635 INFO L185 QuantifierPusher]: treesize reduction 5, result has 90.6 percent of original size 48 [2021-11-03 05:10:20,636 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:20,638 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:20,641 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:20,646 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:10:20,647 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 120 [2021-11-03 05:10:20,649 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:20,654 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:20,655 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:20,655 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:20,655 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:20,656 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:20,657 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:20,659 INFO L180 QuantifierPusher]: treesize reduction 24, result has 71.8 percent of original size [2021-11-03 05:10:20,660 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 52 [2021-11-03 05:10:20,663 INFO L180 QuantifierPusher]: treesize reduction 25, result has 78.6 percent of original size [2021-11-03 05:10:20,664 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 87 [2021-11-03 05:10:20,665 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:20,669 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:20,669 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:20,670 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:20,670 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:20,671 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:20,673 INFO L180 QuantifierPusher]: treesize reduction 24, result has 78.2 percent of original size [2021-11-03 05:10:20,675 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 80 [2021-11-03 05:10:20,678 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 05:10:21,422 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 05:10:21,422 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 05:10:21,423 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 64 [2021-11-03 05:10:21,423 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1712462220] [2021-11-03 05:10:21,423 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 65 states [2021-11-03 05:10:21,423 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:10:21,423 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2021-11-03 05:10:21,424 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=807, Invalid=4449, Unknown=0, NotChecked=0, Total=5256 [2021-11-03 05:10:21,424 INFO L87 Difference]: Start difference. First operand 80 states and 96 transitions. Second operand has 65 states, 65 states have (on average 2.0307692307692307) internal successors, (132), 64 states have internal predecessors, (132), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:10:23,174 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:10:23,175 INFO L93 Difference]: Finished difference Result 248 states and 267 transitions. [2021-11-03 05:10:23,175 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-11-03 05:10:23,175 INFO L78 Accepts]: Start accepts. Automaton has has 65 states, 65 states have (on average 2.0307692307692307) internal successors, (132), 64 states have internal predecessors, (132), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 64 [2021-11-03 05:10:23,175 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:10:23,175 INFO L225 Difference]: With dead ends: 248 [2021-11-03 05:10:23,175 INFO L226 Difference]: Without dead ends: 200 [2021-11-03 05:10:23,176 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 265 GetRequests, 151 SyntacticMatches, 0 SemanticMatches, 114 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4710 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=2050, Invalid=11290, Unknown=0, NotChecked=0, Total=13340 [2021-11-03 05:10:23,176 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 200 states. [2021-11-03 05:10:23,446 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 200 to 80. [2021-11-03 05:10:23,447 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 79 states have (on average 1.2151898734177216) internal successors, (96), 79 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) [2021-11-03 05:10:23,447 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 96 transitions. [2021-11-03 05:10:23,447 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 96 transitions. Word has length 64 [2021-11-03 05:10:23,447 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:10:23,447 INFO L470 AbstractCegarLoop]: Abstraction has 80 states and 96 transitions. [2021-11-03 05:10:23,447 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 65 states, 65 states have (on average 2.0307692307692307) internal successors, (132), 64 states have internal predecessors, (132), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:10:23,447 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 96 transitions. [2021-11-03 05:10:23,447 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-03 05:10:23,447 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:10:23,447 INFO L513 BasicCegarLoop]: trace histogram [15, 14, 14, 12, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:10:23,480 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (121)] Ended with exit code 0 [2021-11-03 05:10:23,648 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3222,121 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:10:23,648 INFO L402 AbstractCegarLoop]: === Iteration 122 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:10:23,648 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:10:23,648 INFO L85 PathProgramCache]: Analyzing trace with hash -1074405973, now seen corresponding path program 80 times [2021-11-03 05:10:23,648 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:10:23,648 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [368881896] [2021-11-03 05:10:23,648 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:10:23,649 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:10:23,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:10:24,065 INFO L134 CoverageAnalysis]: Checked inductivity of 382 backedges. 261 proven. 121 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:10:24,065 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:10:24,065 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [368881896] [2021-11-03 05:10:24,065 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [368881896] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 05:10:24,065 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [70811489] [2021-11-03 05:10:24,065 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-03 05:10:24,066 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:10:24,066 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 05:10:24,066 INFO L229 MonitoredProcess]: Starting monitored process 122 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 05:10:24,067 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (122)] Waiting until timeout for monitored process [2021-11-03 05:10:28,913 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2021-11-03 05:10:28,913 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 05:10:28,914 INFO L263 TraceCheckSpWp]: Trace formula consists of 261 conjuncts, 34 conjunts are in the unsatisfiable core [2021-11-03 05:10:28,915 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:10:29,969 INFO L134 CoverageAnalysis]: Checked inductivity of 382 backedges. 301 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:10:29,969 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:10:30,156 INFO L134 CoverageAnalysis]: Checked inductivity of 382 backedges. 301 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:10:30,156 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [70811489] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 05:10:30,156 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [816591757] [2021-11-03 05:10:30,157 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-03 05:10:30,157 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 05:10:30,157 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 05:10:30,158 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 05:10:30,158 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 05:10:30,167 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:10:30,167 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:10:30,167 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:10:30,167 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 05:10:30,168 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:10:30,168 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:10:30,168 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 05:10:30,169 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 111 [2021-11-03 05:10:30,170 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_127|], 10=[|v_#valid_128|]} [2021-11-03 05:10:30,174 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:10:30,174 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 [2021-11-03 05:10:30,175 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:10:30,175 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:10:30,175 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:10:30,175 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:10:30,175 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 05:10:30,176 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:30,177 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:10:30,179 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:10:30,180 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:10:30,180 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:10:30,183 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:10:30,183 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 [2021-11-03 05:10:30,184 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:10:30,185 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:10:30,185 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:10:30,185 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:10:30,185 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 05:10:30,186 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:30,187 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:10:30,187 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:10:30,188 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 05:10:30,188 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 05:10:30,188 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:108, output treesize:93 [2021-11-03 05:10:30,191 INFO L180 QuantifierPusher]: treesize reduction 16, result has 87.0 percent of original size [2021-11-03 05:10:30,192 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 102 [2021-11-03 05:10:30,194 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:30,197 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:30,201 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:30,210 INFO L180 QuantifierPusher]: treesize reduction 6, result has 97.7 percent of original size [2021-11-03 05:10:30,213 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 251 [2021-11-03 05:10:30,215 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:30,226 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:30,226 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:30,227 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:30,227 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:30,227 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:30,229 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:30,230 INFO L180 QuantifierPusher]: treesize reduction 24, result has 70.7 percent of original size [2021-11-03 05:10:30,231 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 49 [2021-11-03 05:10:30,234 INFO L180 QuantifierPusher]: treesize reduction 25, result has 71.9 percent of original size [2021-11-03 05:10:30,235 INFO L185 QuantifierPusher]: treesize reduction 5, result has 90.6 percent of original size 48 [2021-11-03 05:10:30,236 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:30,238 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:30,241 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:30,246 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:10:30,247 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 120 [2021-11-03 05:10:30,249 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:30,254 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:30,254 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:30,255 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:30,255 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:30,255 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:30,256 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:30,258 INFO L180 QuantifierPusher]: treesize reduction 24, result has 71.8 percent of original size [2021-11-03 05:10:30,259 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 52 [2021-11-03 05:10:30,262 INFO L180 QuantifierPusher]: treesize reduction 25, result has 78.6 percent of original size [2021-11-03 05:10:30,263 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 90 [2021-11-03 05:10:30,264 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:30,268 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:30,268 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:30,269 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:30,269 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:30,275 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:30,278 INFO L180 QuantifierPusher]: treesize reduction 24, result has 78.2 percent of original size [2021-11-03 05:10:30,279 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 80 [2021-11-03 05:10:30,282 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 05:10:31,019 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 05:10:31,020 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 05:10:31,020 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 63 [2021-11-03 05:10:31,020 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1215767986] [2021-11-03 05:10:31,020 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 64 states [2021-11-03 05:10:31,020 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:10:31,020 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2021-11-03 05:10:31,021 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=768, Invalid=4344, Unknown=0, NotChecked=0, Total=5112 [2021-11-03 05:10:31,021 INFO L87 Difference]: Start difference. First operand 80 states and 96 transitions. Second operand has 64 states, 64 states have (on average 2.046875) internal successors, (131), 63 states have internal predecessors, (131), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:10:33,549 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:10:33,549 INFO L93 Difference]: Finished difference Result 307 states and 327 transitions. [2021-11-03 05:10:33,549 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2021-11-03 05:10:33,549 INFO L78 Accepts]: Start accepts. Automaton has has 64 states, 64 states have (on average 2.046875) internal successors, (131), 63 states have internal predecessors, (131), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 64 [2021-11-03 05:10:33,549 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:10:33,550 INFO L225 Difference]: With dead ends: 307 [2021-11-03 05:10:33,550 INFO L226 Difference]: Without dead ends: 259 [2021-11-03 05:10:33,550 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 276 GetRequests, 152 SyntacticMatches, 0 SemanticMatches, 124 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5575 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=2415, Invalid=13335, Unknown=0, NotChecked=0, Total=15750 [2021-11-03 05:10:33,551 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 259 states. [2021-11-03 05:10:33,819 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 259 to 80. [2021-11-03 05:10:33,819 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 79 states have (on average 1.2151898734177216) internal successors, (96), 79 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) [2021-11-03 05:10:33,819 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 96 transitions. [2021-11-03 05:10:33,819 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 96 transitions. Word has length 64 [2021-11-03 05:10:33,819 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:10:33,819 INFO L470 AbstractCegarLoop]: Abstraction has 80 states and 96 transitions. [2021-11-03 05:10:33,819 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 64 states, 64 states have (on average 2.046875) internal successors, (131), 63 states have internal predecessors, (131), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:10:33,819 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 96 transitions. [2021-11-03 05:10:33,820 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-03 05:10:33,820 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:10:33,820 INFO L513 BasicCegarLoop]: trace histogram [15, 14, 14, 11, 3, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:10:33,854 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (122)] Forceful destruction successful, exit code 0 [2021-11-03 05:10:34,020 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 122 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3251 [2021-11-03 05:10:34,020 INFO L402 AbstractCegarLoop]: === Iteration 123 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:10:34,020 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:10:34,020 INFO L85 PathProgramCache]: Analyzing trace with hash -371520004, now seen corresponding path program 81 times [2021-11-03 05:10:34,021 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:10:34,021 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1590547023] [2021-11-03 05:10:34,021 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:10:34,021 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:10:34,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:10:34,403 INFO L134 CoverageAnalysis]: Checked inductivity of 373 backedges. 261 proven. 112 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:10:34,403 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:10:34,403 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1590547023] [2021-11-03 05:10:34,403 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1590547023] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 05:10:34,403 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [817506264] [2021-11-03 05:10:34,404 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-03 05:10:34,404 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:10:34,404 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 05:10:34,404 INFO L229 MonitoredProcess]: Starting monitored process 123 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 05:10:34,405 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (123)] Waiting until timeout for monitored process [2021-11-03 05:10:39,311 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-03 05:10:39,311 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 05:10:39,312 INFO L263 TraceCheckSpWp]: Trace formula consists of 261 conjuncts, 34 conjunts are in the unsatisfiable core [2021-11-03 05:10:39,313 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:10:40,273 INFO L134 CoverageAnalysis]: Checked inductivity of 373 backedges. 301 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:10:40,273 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:10:40,463 INFO L134 CoverageAnalysis]: Checked inductivity of 373 backedges. 301 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:10:40,463 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [817506264] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 05:10:40,463 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1938441148] [2021-11-03 05:10:40,464 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-03 05:10:40,464 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 05:10:40,464 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 05:10:40,464 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 05:10:40,464 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 05:10:40,466 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:10:40,466 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:10:40,466 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:10:40,466 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 05:10:40,467 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:10:40,467 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:10:40,467 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 05:10:40,468 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 111 [2021-11-03 05:10:40,469 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_128|], 10=[|v_#valid_129|]} [2021-11-03 05:10:40,473 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:10:40,473 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 [2021-11-03 05:10:40,474 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:10:40,474 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:10:40,474 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:10:40,474 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:10:40,474 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 05:10:40,475 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:40,476 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:10:40,478 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:10:40,479 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:10:40,479 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:10:40,482 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:10:40,483 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2021-11-03 05:10:40,483 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:10:40,484 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:10:40,484 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:10:40,484 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:10:40,485 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 05:10:40,485 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:40,486 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:10:40,487 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:10:40,487 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 05:10:40,487 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 05:10:40,487 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:108, output treesize:93 [2021-11-03 05:10:40,491 INFO L180 QuantifierPusher]: treesize reduction 16, result has 87.0 percent of original size [2021-11-03 05:10:40,492 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 100 [2021-11-03 05:10:40,493 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:40,497 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:40,501 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:40,509 INFO L180 QuantifierPusher]: treesize reduction 11, result has 95.8 percent of original size [2021-11-03 05:10:40,512 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 251 [2021-11-03 05:10:40,515 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:40,525 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:40,526 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:40,526 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:40,527 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:40,527 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:40,615 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:40,617 INFO L180 QuantifierPusher]: treesize reduction 24, result has 70.7 percent of original size [2021-11-03 05:10:40,618 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 49 [2021-11-03 05:10:40,620 INFO L180 QuantifierPusher]: treesize reduction 25, result has 71.9 percent of original size [2021-11-03 05:10:40,621 INFO L185 QuantifierPusher]: treesize reduction 5, result has 90.6 percent of original size 48 [2021-11-03 05:10:40,623 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:40,625 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:40,628 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:40,633 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:10:40,634 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 120 [2021-11-03 05:10:40,636 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:40,641 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:40,641 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:40,642 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:40,642 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:40,642 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:40,643 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:40,645 INFO L180 QuantifierPusher]: treesize reduction 24, result has 71.8 percent of original size [2021-11-03 05:10:40,646 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 52 [2021-11-03 05:10:40,649 INFO L180 QuantifierPusher]: treesize reduction 25, result has 78.6 percent of original size [2021-11-03 05:10:40,650 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 90 [2021-11-03 05:10:40,652 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:40,655 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:40,656 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:40,656 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:40,657 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:40,657 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:40,660 INFO L180 QuantifierPusher]: treesize reduction 24, result has 78.2 percent of original size [2021-11-03 05:10:40,661 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 80 [2021-11-03 05:10:40,664 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 05:10:41,402 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 05:10:41,403 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 05:10:41,403 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 62 [2021-11-03 05:10:41,403 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [433181832] [2021-11-03 05:10:41,403 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 63 states [2021-11-03 05:10:41,403 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:10:41,403 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2021-11-03 05:10:41,404 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=733, Invalid=4237, Unknown=0, NotChecked=0, Total=4970 [2021-11-03 05:10:41,404 INFO L87 Difference]: Start difference. First operand 80 states and 96 transitions. Second operand has 63 states, 63 states have (on average 2.0634920634920637) internal successors, (130), 62 states have internal predecessors, (130), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:10:44,031 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:10:44,031 INFO L93 Difference]: Finished difference Result 365 states and 386 transitions. [2021-11-03 05:10:44,031 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2021-11-03 05:10:44,031 INFO L78 Accepts]: Start accepts. Automaton has has 63 states, 63 states have (on average 2.0634920634920637) internal successors, (130), 62 states have internal predecessors, (130), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 64 [2021-11-03 05:10:44,031 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:10:44,032 INFO L225 Difference]: With dead ends: 365 [2021-11-03 05:10:44,032 INFO L226 Difference]: Without dead ends: 317 [2021-11-03 05:10:44,032 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 285 GetRequests, 153 SyntacticMatches, 0 SemanticMatches, 132 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6329 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=2743, Invalid=15079, Unknown=0, NotChecked=0, Total=17822 [2021-11-03 05:10:44,033 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 317 states. [2021-11-03 05:10:44,312 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 317 to 80. [2021-11-03 05:10:44,313 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 79 states have (on average 1.2151898734177216) internal successors, (96), 79 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) [2021-11-03 05:10:44,313 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 96 transitions. [2021-11-03 05:10:44,313 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 96 transitions. Word has length 64 [2021-11-03 05:10:44,313 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:10:44,313 INFO L470 AbstractCegarLoop]: Abstraction has 80 states and 96 transitions. [2021-11-03 05:10:44,313 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 63 states, 63 states have (on average 2.0634920634920637) internal successors, (130), 62 states have internal predecessors, (130), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:10:44,313 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 96 transitions. [2021-11-03 05:10:44,313 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-03 05:10:44,313 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:10:44,314 INFO L513 BasicCegarLoop]: trace histogram [15, 14, 14, 10, 4, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:10:44,350 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (123)] Forceful destruction successful, exit code 0 [2021-11-03 05:10:44,521 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 123 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3280 [2021-11-03 05:10:44,521 INFO L402 AbstractCegarLoop]: === Iteration 124 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:10:44,521 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:10:44,521 INFO L85 PathProgramCache]: Analyzing trace with hash 1867911051, now seen corresponding path program 82 times [2021-11-03 05:10:44,521 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:10:44,521 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [932742928] [2021-11-03 05:10:44,521 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:10:44,521 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:10:44,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:10:44,959 INFO L134 CoverageAnalysis]: Checked inductivity of 366 backedges. 261 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:10:44,959 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:10:44,959 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [932742928] [2021-11-03 05:10:44,959 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [932742928] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 05:10:44,959 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [661760949] [2021-11-03 05:10:44,959 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-03 05:10:44,959 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:10:44,959 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 05:10:44,960 INFO L229 MonitoredProcess]: Starting monitored process 124 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 05:10:44,961 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (124)] Waiting until timeout for monitored process [2021-11-03 05:10:49,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:10:49,936 INFO L263 TraceCheckSpWp]: Trace formula consists of 261 conjuncts, 34 conjunts are in the unsatisfiable core [2021-11-03 05:10:49,937 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:10:50,938 INFO L134 CoverageAnalysis]: Checked inductivity of 366 backedges. 301 proven. 65 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:10:50,938 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:10:51,127 INFO L134 CoverageAnalysis]: Checked inductivity of 366 backedges. 301 proven. 65 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:10:51,127 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [661760949] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 05:10:51,127 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1475031069] [2021-11-03 05:10:51,128 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-03 05:10:51,128 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 05:10:51,128 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 05:10:51,128 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 05:10:51,129 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 05:10:51,130 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:10:51,131 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:10:51,131 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:10:51,131 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 05:10:51,131 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:10:51,132 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:10:51,132 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 05:10:51,133 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 111 [2021-11-03 05:10:51,135 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_129|], 10=[|v_#valid_130|]} [2021-11-03 05:10:51,139 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:10:51,149 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 [2021-11-03 05:10:51,149 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:10:51,150 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:10:51,150 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:10:51,150 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:10:51,151 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 05:10:51,151 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:51,153 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:10:51,155 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:10:51,156 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:10:51,157 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:10:51,161 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:10:51,162 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 [2021-11-03 05:10:51,162 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:10:51,163 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:10:51,164 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:10:51,164 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:10:51,164 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 05:10:51,164 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:51,165 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:10:51,166 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:10:51,166 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 05:10:51,167 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 05:10:51,167 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:108, output treesize:93 [2021-11-03 05:10:51,170 INFO L180 QuantifierPusher]: treesize reduction 16, result has 87.0 percent of original size [2021-11-03 05:10:51,171 INFO L185 QuantifierPusher]: treesize reduction 5, result has 94.8 percent of original size 91 [2021-11-03 05:10:51,172 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:51,176 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:51,180 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:51,189 INFO L180 QuantifierPusher]: treesize reduction 6, result has 97.7 percent of original size [2021-11-03 05:10:51,192 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 249 [2021-11-03 05:10:51,194 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:51,206 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:51,206 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:51,207 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:51,208 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:51,208 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:51,210 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:51,213 INFO L180 QuantifierPusher]: treesize reduction 24, result has 70.7 percent of original size [2021-11-03 05:10:51,214 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 49 [2021-11-03 05:10:51,216 INFO L180 QuantifierPusher]: treesize reduction 25, result has 71.9 percent of original size [2021-11-03 05:10:51,217 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 57 [2021-11-03 05:10:51,218 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:51,221 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:51,224 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:51,229 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:10:51,230 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 122 [2021-11-03 05:10:51,232 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:51,237 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:51,238 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:51,238 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:51,238 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:51,239 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:51,240 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:51,242 INFO L180 QuantifierPusher]: treesize reduction 24, result has 71.8 percent of original size [2021-11-03 05:10:51,243 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 52 [2021-11-03 05:10:51,246 INFO L180 QuantifierPusher]: treesize reduction 25, result has 78.6 percent of original size [2021-11-03 05:10:51,247 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 87 [2021-11-03 05:10:51,248 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:51,252 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:51,252 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:51,252 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:51,253 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:51,254 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:10:51,256 INFO L180 QuantifierPusher]: treesize reduction 24, result has 78.2 percent of original size [2021-11-03 05:10:51,257 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 80 [2021-11-03 05:10:51,261 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 05:10:52,058 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 05:10:52,058 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 05:10:52,058 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 61 [2021-11-03 05:10:52,058 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1319516303] [2021-11-03 05:10:52,058 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 62 states [2021-11-03 05:10:52,058 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:10:52,058 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2021-11-03 05:10:52,059 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=702, Invalid=4128, Unknown=0, NotChecked=0, Total=4830 [2021-11-03 05:10:52,059 INFO L87 Difference]: Start difference. First operand 80 states and 96 transitions. Second operand has 62 states, 62 states have (on average 2.0806451612903225) internal successors, (129), 61 states have internal predecessors, (129), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:10:55,099 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:10:55,099 INFO L93 Difference]: Finished difference Result 422 states and 444 transitions. [2021-11-03 05:10:55,099 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 77 states. [2021-11-03 05:10:55,099 INFO L78 Accepts]: Start accepts. Automaton has has 62 states, 62 states have (on average 2.0806451612903225) internal successors, (129), 61 states have internal predecessors, (129), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 64 [2021-11-03 05:10:55,099 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:10:55,100 INFO L225 Difference]: With dead ends: 422 [2021-11-03 05:10:55,100 INFO L226 Difference]: Without dead ends: 374 [2021-11-03 05:10:55,101 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 292 GetRequests, 154 SyntacticMatches, 0 SemanticMatches, 138 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6936 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=3010, Invalid=16450, Unknown=0, NotChecked=0, Total=19460 [2021-11-03 05:10:55,101 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 374 states. [2021-11-03 05:10:55,405 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 374 to 80. [2021-11-03 05:10:55,405 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 79 states have (on average 1.2151898734177216) internal successors, (96), 79 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) [2021-11-03 05:10:55,405 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 96 transitions. [2021-11-03 05:10:55,405 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 96 transitions. Word has length 64 [2021-11-03 05:10:55,405 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:10:55,405 INFO L470 AbstractCegarLoop]: Abstraction has 80 states and 96 transitions. [2021-11-03 05:10:55,405 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 62 states, 62 states have (on average 2.0806451612903225) internal successors, (129), 61 states have internal predecessors, (129), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:10:55,405 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 96 transitions. [2021-11-03 05:10:55,406 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-03 05:10:55,406 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:10:55,406 INFO L513 BasicCegarLoop]: trace histogram [15, 14, 14, 9, 5, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:10:55,459 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (124)] Forceful destruction successful, exit code 0 [2021-11-03 05:10:55,633 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 124 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3309 [2021-11-03 05:10:55,633 INFO L402 AbstractCegarLoop]: === Iteration 125 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:10:55,633 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:10:55,633 INFO L85 PathProgramCache]: Analyzing trace with hash -692248548, now seen corresponding path program 83 times [2021-11-03 05:10:55,633 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:10:55,633 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1071142966] [2021-11-03 05:10:55,633 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:10:55,634 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:10:55,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:10:56,007 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 261 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:10:56,007 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:10:56,007 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1071142966] [2021-11-03 05:10:56,007 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1071142966] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 05:10:56,007 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [537478841] [2021-11-03 05:10:56,007 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-03 05:10:56,007 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:10:56,007 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 05:10:56,008 INFO L229 MonitoredProcess]: Starting monitored process 125 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 05:10:56,009 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (125)] Waiting until timeout for monitored process [2021-11-03 05:11:01,057 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2021-11-03 05:11:01,057 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 05:11:01,059 INFO L263 TraceCheckSpWp]: Trace formula consists of 261 conjuncts, 34 conjunts are in the unsatisfiable core [2021-11-03 05:11:01,059 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:11:02,093 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 301 proven. 60 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:11:02,093 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:11:02,322 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 301 proven. 60 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:11:02,322 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [537478841] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 05:11:02,322 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [317314344] [2021-11-03 05:11:02,323 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-03 05:11:02,323 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 05:11:02,323 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 05:11:02,323 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 05:11:02,323 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 05:11:02,338 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:11:02,338 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:11:02,339 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:11:02,339 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 05:11:02,339 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:11:02,340 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:11:02,340 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 05:11:02,341 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 111 [2021-11-03 05:11:02,343 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_130|], 10=[|v_#valid_131|]} [2021-11-03 05:11:02,348 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:11:02,349 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 [2021-11-03 05:11:02,350 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:11:02,350 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:11:02,350 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:11:02,351 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:11:02,351 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 05:11:02,351 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:11:02,353 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:11:02,356 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:11:02,357 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:11:02,358 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:11:02,362 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:11:02,362 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 [2021-11-03 05:11:02,363 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:11:02,364 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:11:02,365 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:11:02,365 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:11:02,365 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 05:11:02,365 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:11:02,367 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:11:02,368 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:11:02,369 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 05:11:02,370 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 05:11:02,370 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:108, output treesize:93 [2021-11-03 05:11:02,375 INFO L180 QuantifierPusher]: treesize reduction 16, result has 87.0 percent of original size [2021-11-03 05:11:02,376 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 100 [2021-11-03 05:11:02,378 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:11:02,384 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:11:02,390 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:11:02,404 INFO L180 QuantifierPusher]: treesize reduction 11, result has 95.8 percent of original size [2021-11-03 05:11:02,408 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 251 [2021-11-03 05:11:02,412 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:11:02,422 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:11:02,423 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:11:02,423 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:11:02,424 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:11:02,424 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:11:02,433 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:11:02,436 INFO L180 QuantifierPusher]: treesize reduction 24, result has 70.7 percent of original size [2021-11-03 05:11:02,437 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 49 [2021-11-03 05:11:02,441 INFO L180 QuantifierPusher]: treesize reduction 25, result has 71.9 percent of original size [2021-11-03 05:11:02,442 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 57 [2021-11-03 05:11:02,444 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:11:02,447 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:11:02,452 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:11:02,459 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:11:02,461 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 122 [2021-11-03 05:11:02,464 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:11:02,472 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:11:02,473 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:11:02,473 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:11:02,474 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:11:02,474 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:11:02,476 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:11:02,479 INFO L180 QuantifierPusher]: treesize reduction 24, result has 71.8 percent of original size [2021-11-03 05:11:02,480 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 52 [2021-11-03 05:11:02,485 INFO L180 QuantifierPusher]: treesize reduction 25, result has 78.6 percent of original size [2021-11-03 05:11:02,487 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 90 [2021-11-03 05:11:02,489 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:11:02,494 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:11:02,495 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:11:02,496 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:11:02,496 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:11:02,498 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:11:02,502 INFO L180 QuantifierPusher]: treesize reduction 24, result has 78.2 percent of original size [2021-11-03 05:11:02,503 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 80 [2021-11-03 05:11:02,508 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 05:11:03,269 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 05:11:03,269 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 05:11:03,269 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 60 [2021-11-03 05:11:03,269 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [440269382] [2021-11-03 05:11:03,269 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 61 states [2021-11-03 05:11:03,269 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:11:03,270 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2021-11-03 05:11:03,270 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=675, Invalid=4017, Unknown=0, NotChecked=0, Total=4692 [2021-11-03 05:11:03,270 INFO L87 Difference]: Start difference. First operand 80 states and 96 transitions. Second operand has 61 states, 61 states have (on average 2.098360655737705) internal successors, (128), 60 states have internal predecessors, (128), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:11:06,732 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:11:06,732 INFO L93 Difference]: Finished difference Result 478 states and 501 transitions. [2021-11-03 05:11:06,732 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 83 states. [2021-11-03 05:11:06,733 INFO L78 Accepts]: Start accepts. Automaton has has 61 states, 61 states have (on average 2.098360655737705) internal successors, (128), 60 states have internal predecessors, (128), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 64 [2021-11-03 05:11:06,733 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:11:06,733 INFO L225 Difference]: With dead ends: 478 [2021-11-03 05:11:06,733 INFO L226 Difference]: Without dead ends: 430 [2021-11-03 05:11:06,734 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 297 GetRequests, 155 SyntacticMatches, 0 SemanticMatches, 142 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7357 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=3198, Invalid=17394, Unknown=0, NotChecked=0, Total=20592 [2021-11-03 05:11:06,734 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 430 states. [2021-11-03 05:11:07,040 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 430 to 80. [2021-11-03 05:11:07,040 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 79 states have (on average 1.2151898734177216) internal successors, (96), 79 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) [2021-11-03 05:11:07,040 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 96 transitions. [2021-11-03 05:11:07,041 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 96 transitions. Word has length 64 [2021-11-03 05:11:07,041 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:11:07,041 INFO L470 AbstractCegarLoop]: Abstraction has 80 states and 96 transitions. [2021-11-03 05:11:07,041 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 61 states, 61 states have (on average 2.098360655737705) internal successors, (128), 60 states have internal predecessors, (128), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:11:07,041 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 96 transitions. [2021-11-03 05:11:07,041 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-03 05:11:07,041 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:11:07,041 INFO L513 BasicCegarLoop]: trace histogram [15, 14, 14, 8, 6, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:11:07,077 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (125)] Ended with exit code 0 [2021-11-03 05:11:07,242 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 125 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3338 [2021-11-03 05:11:07,242 INFO L402 AbstractCegarLoop]: === Iteration 126 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:11:07,242 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:11:07,242 INFO L85 PathProgramCache]: Analyzing trace with hash -220645013, now seen corresponding path program 84 times [2021-11-03 05:11:07,242 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:11:07,242 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [652304133] [2021-11-03 05:11:07,243 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:11:07,243 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:11:07,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:11:07,624 INFO L134 CoverageAnalysis]: Checked inductivity of 358 backedges. 261 proven. 97 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:11:07,624 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:11:07,624 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [652304133] [2021-11-03 05:11:07,624 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [652304133] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 05:11:07,624 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1190668234] [2021-11-03 05:11:07,624 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-03 05:11:07,624 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:11:07,625 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 05:11:07,625 INFO L229 MonitoredProcess]: Starting monitored process 126 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 05:11:07,626 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (126)] Waiting until timeout for monitored process [2021-11-03 05:11:12,822 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-03 05:11:12,822 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 05:11:12,823 INFO L263 TraceCheckSpWp]: Trace formula consists of 261 conjuncts, 34 conjunts are in the unsatisfiable core [2021-11-03 05:11:12,824 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:11:13,736 INFO L134 CoverageAnalysis]: Checked inductivity of 358 backedges. 301 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:11:13,736 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:11:13,976 INFO L134 CoverageAnalysis]: Checked inductivity of 358 backedges. 301 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:11:13,976 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1190668234] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 05:11:13,976 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [148622249] [2021-11-03 05:11:13,977 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-03 05:11:13,977 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 05:11:13,977 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 05:11:13,977 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 05:11:13,977 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 05:11:13,979 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:11:13,979 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:11:13,980 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:11:13,980 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 05:11:13,980 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:11:13,980 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:11:13,981 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 05:11:13,981 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 111 [2021-11-03 05:11:13,982 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_131|], 10=[|v_#valid_132|]} [2021-11-03 05:11:13,986 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:11:13,987 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 [2021-11-03 05:11:13,987 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:11:13,987 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:11:13,988 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:11:13,988 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:11:13,988 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 05:11:13,988 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:11:13,990 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:11:13,992 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:11:13,992 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:11:13,993 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:11:13,996 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:11:13,996 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 [2021-11-03 05:11:13,997 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:11:13,998 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:11:13,998 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:11:13,998 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:11:13,998 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 05:11:13,998 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:11:14,000 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:11:14,000 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:11:14,001 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 05:11:14,001 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 05:11:14,001 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:108, output treesize:93 [2021-11-03 05:11:14,004 INFO L180 QuantifierPusher]: treesize reduction 16, result has 87.0 percent of original size [2021-11-03 05:11:14,005 INFO L185 QuantifierPusher]: treesize reduction 7, result has 92.9 percent of original size 91 [2021-11-03 05:11:14,007 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:11:14,011 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:11:14,015 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:11:14,024 INFO L180 QuantifierPusher]: treesize reduction 6, result has 97.7 percent of original size [2021-11-03 05:11:14,026 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 249 [2021-11-03 05:11:14,029 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:11:14,040 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:11:14,041 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:11:14,041 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:11:14,042 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:11:14,042 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:11:14,043 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:11:14,045 INFO L180 QuantifierPusher]: treesize reduction 24, result has 70.7 percent of original size [2021-11-03 05:11:14,046 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 49 [2021-11-03 05:11:14,048 INFO L180 QuantifierPusher]: treesize reduction 25, result has 71.9 percent of original size [2021-11-03 05:11:14,050 INFO L185 QuantifierPusher]: treesize reduction 5, result has 90.6 percent of original size 48 [2021-11-03 05:11:14,051 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:11:14,053 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:11:14,056 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:11:14,061 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:11:14,062 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 120 [2021-11-03 05:11:14,064 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:11:14,069 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:11:14,070 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:11:14,070 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:11:14,071 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:11:14,071 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:11:14,072 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:11:14,074 INFO L180 QuantifierPusher]: treesize reduction 24, result has 71.8 percent of original size [2021-11-03 05:11:14,075 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 52 [2021-11-03 05:11:14,078 INFO L180 QuantifierPusher]: treesize reduction 25, result has 78.6 percent of original size [2021-11-03 05:11:14,079 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 87 [2021-11-03 05:11:14,081 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:11:14,084 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:11:14,085 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:11:14,085 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:11:14,085 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:11:14,086 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:11:14,089 INFO L180 QuantifierPusher]: treesize reduction 24, result has 78.2 percent of original size [2021-11-03 05:11:14,090 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 80 [2021-11-03 05:11:14,093 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 05:11:14,830 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 05:11:14,830 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 05:11:14,830 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 59 [2021-11-03 05:11:14,830 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [360124525] [2021-11-03 05:11:14,830 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 60 states [2021-11-03 05:11:14,830 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:11:14,831 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2021-11-03 05:11:14,831 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=652, Invalid=3904, Unknown=0, NotChecked=0, Total=4556 [2021-11-03 05:11:14,831 INFO L87 Difference]: Start difference. First operand 80 states and 96 transitions. Second operand has 60 states, 60 states have (on average 2.1166666666666667) internal successors, (127), 59 states have internal predecessors, (127), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:11:18,572 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:11:18,572 INFO L93 Difference]: Finished difference Result 533 states and 557 transitions. [2021-11-03 05:11:18,572 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 87 states. [2021-11-03 05:11:18,572 INFO L78 Accepts]: Start accepts. Automaton has has 60 states, 60 states have (on average 2.1166666666666667) internal successors, (127), 59 states have internal predecessors, (127), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 64 [2021-11-03 05:11:18,572 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:11:18,573 INFO L225 Difference]: With dead ends: 533 [2021-11-03 05:11:18,573 INFO L226 Difference]: Without dead ends: 485 [2021-11-03 05:11:18,574 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 300 GetRequests, 156 SyntacticMatches, 0 SemanticMatches, 144 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7565 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=3295, Invalid=17875, Unknown=0, NotChecked=0, Total=21170 [2021-11-03 05:11:18,574 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 485 states. [2021-11-03 05:11:18,884 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 485 to 80. [2021-11-03 05:11:18,884 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 79 states have (on average 1.2151898734177216) internal successors, (96), 79 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) [2021-11-03 05:11:18,885 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 96 transitions. [2021-11-03 05:11:18,885 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 96 transitions. Word has length 64 [2021-11-03 05:11:18,885 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:11:18,885 INFO L470 AbstractCegarLoop]: Abstraction has 80 states and 96 transitions. [2021-11-03 05:11:18,885 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 60 states, 60 states have (on average 2.1166666666666667) internal successors, (127), 59 states have internal predecessors, (127), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:11:18,885 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 96 transitions. [2021-11-03 05:11:18,885 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-03 05:11:18,885 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:11:18,885 INFO L513 BasicCegarLoop]: trace histogram [15, 14, 14, 7, 7, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:11:18,928 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (126)] Forceful destruction successful, exit code 0 [2021-11-03 05:11:19,086 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3367,126 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:11:19,086 INFO L402 AbstractCegarLoop]: === Iteration 127 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:11:19,086 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:11:19,086 INFO L85 PathProgramCache]: Analyzing trace with hash -482526660, now seen corresponding path program 85 times [2021-11-03 05:11:19,086 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:11:19,086 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1292033118] [2021-11-03 05:11:19,086 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:11:19,087 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:11:19,175 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:11:19,508 INFO L134 CoverageAnalysis]: Checked inductivity of 357 backedges. 261 proven. 96 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:11:19,509 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:11:19,509 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1292033118] [2021-11-03 05:11:19,509 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1292033118] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 05:11:19,509 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1068442655] [2021-11-03 05:11:19,509 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-03 05:11:19,509 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:11:19,509 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 05:11:19,510 INFO L229 MonitoredProcess]: Starting monitored process 127 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 05:11:19,511 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13233e23-b386-409d-9537-0a2e1f962ca0/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (127)] Waiting until timeout for monitored process [2021-11-03 05:11:24,755 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:11:24,756 INFO L263 TraceCheckSpWp]: Trace formula consists of 261 conjuncts, 34 conjunts are in the unsatisfiable core [2021-11-03 05:11:24,757 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:11:25,715 INFO L134 CoverageAnalysis]: Checked inductivity of 357 backedges. 301 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:11:25,716 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:11:25,907 INFO L134 CoverageAnalysis]: Checked inductivity of 357 backedges. 301 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:11:25,907 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1068442655] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 05:11:25,908 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2105259713] [2021-11-03 05:11:25,908 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-03 05:11:25,908 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 05:11:25,909 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 05:11:25,909 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 05:11:25,909 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 05:11:25,910 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:11:25,911 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:11:25,911 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:11:25,911 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 05:11:25,911 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:11:25,912 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:11:25,912 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 05:11:25,913 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 111 [2021-11-03 05:11:25,914 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_132|], 10=[|v_#valid_133|]} [2021-11-03 05:11:25,934 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:11:25,935 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 [2021-11-03 05:11:25,935 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:11:25,936 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:11:25,936 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:11:25,936 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 05:11:25,936 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 05:11:25,936 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:11:25,938 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:11:25,940 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:11:25,941 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:11:25,941 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:11:25,944 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:11:25,944 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 [2021-11-03 05:11:25,945 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:11:25,946 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:11:25,946 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:11:25,946 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 05:11:25,946 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 05:11:25,946 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:11:25,948 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:11:25,948 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:11:25,949 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 05:11:25,949 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 05:11:25,949 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:108, output treesize:93 [2021-11-03 05:11:25,952 INFO L180 QuantifierPusher]: treesize reduction 16, result has 87.0 percent of original size [2021-11-03 05:11:25,954 INFO L185 QuantifierPusher]: treesize reduction 5, result has 94.8 percent of original size 91 [2021-11-03 05:11:25,955 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:11:25,959 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:11:25,963 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:11:25,972 INFO L180 QuantifierPusher]: treesize reduction 6, result has 97.7 percent of original size [2021-11-03 05:11:25,975 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 249 [2021-11-03 05:11:25,977 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:11:25,989 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:11:25,989 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:11:25,990 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:11:25,990 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:11:25,991 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:11:25,992 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:11:25,994 INFO L180 QuantifierPusher]: treesize reduction 24, result has 70.7 percent of original size [2021-11-03 05:11:25,995 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 49 [2021-11-03 05:11:25,997 INFO L180 QuantifierPusher]: treesize reduction 25, result has 71.9 percent of original size [2021-11-03 05:11:25,998 INFO L185 QuantifierPusher]: treesize reduction 5, result has 90.6 percent of original size 48 [2021-11-03 05:11:25,999 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:11:26,002 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:11:26,005 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:11:26,009 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:11:26,011 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 120 [2021-11-03 05:11:26,013 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:11:26,018 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:11:26,018 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:11:26,019 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:11:26,019 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:11:26,020 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:11:26,020 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:11:26,022 INFO L180 QuantifierPusher]: treesize reduction 24, result has 71.8 percent of original size [2021-11-03 05:11:26,023 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 52 [2021-11-03 05:11:26,026 INFO L180 QuantifierPusher]: treesize reduction 25, result has 78.6 percent of original size [2021-11-03 05:11:26,028 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 90 [2021-11-03 05:11:26,029 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:11:26,033 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:11:26,033 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:11:26,034 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:11:26,034 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:11:26,035 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:11:26,037 INFO L180 QuantifierPusher]: treesize reduction 24, result has 78.2 percent of original size [2021-11-03 05:11:26,039 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 80 [2021-11-03 05:11:26,042 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 05:11:26,780 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 05:11:26,780 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 05:11:26,780 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 58 [2021-11-03 05:11:26,780 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2003334285] [2021-11-03 05:11:26,780 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 59 states [2021-11-03 05:11:26,780 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:11:26,781 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2021-11-03 05:11:26,781 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=633, Invalid=3789, Unknown=0, NotChecked=0, Total=4422 [2021-11-03 05:11:26,781 INFO L87 Difference]: Start difference. First operand 80 states and 96 transitions. Second operand has 59 states, 59 states have (on average 2.135593220338983) internal successors, (126), 58 states have internal predecessors, (126), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)