./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-examples/standard_compareModified_ground.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 53f42b1a Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21c6c84-752b-41d7-b6ad-3739bf9fae1a/bin/utaipan-TEXQjIfE4P/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21c6c84-752b-41d7-b6ad-3739bf9fae1a/bin/utaipan-TEXQjIfE4P/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21c6c84-752b-41d7-b6ad-3739bf9fae1a/bin/utaipan-TEXQjIfE4P/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21c6c84-752b-41d7-b6ad-3739bf9fae1a/bin/utaipan-TEXQjIfE4P/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-examples/standard_compareModified_ground.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21c6c84-752b-41d7-b6ad-3739bf9fae1a/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21c6c84-752b-41d7-b6ad-3739bf9fae1a/bin/utaipan-TEXQjIfE4P --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash ec4d4b5cea975144b4de3d9f9eb9b04d1c4b7aa6b7464f360f53530c4a9bd50e --- Real Ultimate output --- This is Ultimate 0.2.1-dev-53f42b1 [2021-11-20 23:57:10,203 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-20 23:57:10,206 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-20 23:57:10,265 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-20 23:57:10,265 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-20 23:57:10,267 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-20 23:57:10,268 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-20 23:57:10,270 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-20 23:57:10,272 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-20 23:57:10,273 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-20 23:57:10,274 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-20 23:57:10,276 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-20 23:57:10,276 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-20 23:57:10,277 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-20 23:57:10,279 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-20 23:57:10,281 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-20 23:57:10,285 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-20 23:57:10,286 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-20 23:57:10,289 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-20 23:57:10,292 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-20 23:57:10,297 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-20 23:57:10,299 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-20 23:57:10,302 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-20 23:57:10,303 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-20 23:57:10,314 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-20 23:57:10,315 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-20 23:57:10,315 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-20 23:57:10,317 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-20 23:57:10,318 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-20 23:57:10,320 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-20 23:57:10,320 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-20 23:57:10,321 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-20 23:57:10,323 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-20 23:57:10,325 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-20 23:57:10,326 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-20 23:57:10,326 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-20 23:57:10,326 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-20 23:57:10,327 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-20 23:57:10,327 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-20 23:57:10,327 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-20 23:57:10,328 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-20 23:57:10,329 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21c6c84-752b-41d7-b6ad-3739bf9fae1a/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-20 23:57:10,370 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-20 23:57:10,371 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-20 23:57:10,371 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-20 23:57:10,371 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-20 23:57:10,378 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-20 23:57:10,379 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-20 23:57:10,379 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-20 23:57:10,379 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-20 23:57:10,379 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-20 23:57:10,380 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-20 23:57:10,381 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-20 23:57:10,381 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-20 23:57:10,381 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-20 23:57:10,381 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-20 23:57:10,381 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-20 23:57:10,382 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-20 23:57:10,382 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-20 23:57:10,382 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-20 23:57:10,383 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-20 23:57:10,383 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-20 23:57:10,383 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-20 23:57:10,383 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-20 23:57:10,384 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-20 23:57:10,384 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-20 23:57:10,384 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-20 23:57:10,384 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-20 23:57:10,386 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-20 23:57:10,386 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-20 23:57:10,386 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-20 23:57:10,386 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-20 23:57:10,387 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-20 23:57:10,387 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-20 23:57:10,387 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-20 23:57:10,388 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-20 23:57:10,388 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-20 23:57:10,388 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-20 23:57:10,388 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-20 23:57:10,388 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-20 23:57:10,389 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-20 23:57:10,389 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-20 23:57:10,389 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-20 23:57:10,389 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_e21c6c84-752b-41d7-b6ad-3739bf9fae1a/bin/utaipan-TEXQjIfE4P/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21c6c84-752b-41d7-b6ad-3739bf9fae1a/bin/utaipan-TEXQjIfE4P Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> ec4d4b5cea975144b4de3d9f9eb9b04d1c4b7aa6b7464f360f53530c4a9bd50e [2021-11-20 23:57:10,654 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-20 23:57:10,683 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-20 23:57:10,685 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-20 23:57:10,686 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-20 23:57:10,688 INFO L275 PluginConnector]: CDTParser initialized [2021-11-20 23:57:10,689 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21c6c84-752b-41d7-b6ad-3739bf9fae1a/bin/utaipan-TEXQjIfE4P/../../sv-benchmarks/c/array-examples/standard_compareModified_ground.i [2021-11-20 23:57:10,756 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21c6c84-752b-41d7-b6ad-3739bf9fae1a/bin/utaipan-TEXQjIfE4P/data/e9271d9bd/5a0be29d8a4f40b1acda653f72da7ddc/FLAG824fb5b58 [2021-11-20 23:57:11,361 INFO L306 CDTParser]: Found 1 translation units. [2021-11-20 23:57:11,362 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21c6c84-752b-41d7-b6ad-3739bf9fae1a/sv-benchmarks/c/array-examples/standard_compareModified_ground.i [2021-11-20 23:57:11,372 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21c6c84-752b-41d7-b6ad-3739bf9fae1a/bin/utaipan-TEXQjIfE4P/data/e9271d9bd/5a0be29d8a4f40b1acda653f72da7ddc/FLAG824fb5b58 [2021-11-20 23:57:11,716 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21c6c84-752b-41d7-b6ad-3739bf9fae1a/bin/utaipan-TEXQjIfE4P/data/e9271d9bd/5a0be29d8a4f40b1acda653f72da7ddc [2021-11-20 23:57:11,719 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-20 23:57:11,721 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-20 23:57:11,722 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-20 23:57:11,723 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-20 23:57:11,727 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-20 23:57:11,728 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 11:57:11" (1/1) ... [2021-11-20 23:57:11,729 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2184995f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:57:11, skipping insertion in model container [2021-11-20 23:57:11,730 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 11:57:11" (1/1) ... [2021-11-20 23:57:11,738 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-20 23:57:11,755 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-20 23:57:11,962 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21c6c84-752b-41d7-b6ad-3739bf9fae1a/sv-benchmarks/c/array-examples/standard_compareModified_ground.i[824,837] [2021-11-20 23:57:11,978 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-20 23:57:11,986 INFO L203 MainTranslator]: Completed pre-run [2021-11-20 23:57:11,998 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21c6c84-752b-41d7-b6ad-3739bf9fae1a/sv-benchmarks/c/array-examples/standard_compareModified_ground.i[824,837] [2021-11-20 23:57:12,007 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-20 23:57:12,020 INFO L208 MainTranslator]: Completed translation [2021-11-20 23:57:12,021 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:57:12 WrapperNode [2021-11-20 23:57:12,021 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-20 23:57:12,022 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-20 23:57:12,023 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-20 23:57:12,023 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-20 23:57:12,030 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:57:12" (1/1) ... [2021-11-20 23:57:12,037 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:57:12" (1/1) ... [2021-11-20 23:57:12,057 INFO L137 Inliner]: procedures = 16, calls = 27, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 86 [2021-11-20 23:57:12,057 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-20 23:57:12,058 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-20 23:57:12,058 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-20 23:57:12,059 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-20 23:57:12,067 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:57:12" (1/1) ... [2021-11-20 23:57:12,067 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:57:12" (1/1) ... [2021-11-20 23:57:12,069 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:57:12" (1/1) ... [2021-11-20 23:57:12,070 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:57:12" (1/1) ... [2021-11-20 23:57:12,075 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:57:12" (1/1) ... [2021-11-20 23:57:12,079 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:57:12" (1/1) ... [2021-11-20 23:57:12,081 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:57:12" (1/1) ... [2021-11-20 23:57:12,083 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-20 23:57:12,084 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-20 23:57:12,084 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-20 23:57:12,084 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-20 23:57:12,085 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:57:12" (1/1) ... [2021-11-20 23:57:12,092 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-20 23:57:12,102 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21c6c84-752b-41d7-b6ad-3739bf9fae1a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:57:12,117 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21c6c84-752b-41d7-b6ad-3739bf9fae1a/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-20 23:57:12,146 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21c6c84-752b-41d7-b6ad-3739bf9fae1a/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-20 23:57:12,164 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-20 23:57:12,164 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-20 23:57:12,164 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-20 23:57:12,164 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-20 23:57:12,164 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-20 23:57:12,165 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-20 23:57:12,165 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-20 23:57:12,165 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-11-20 23:57:12,165 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-11-20 23:57:12,165 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-20 23:57:12,239 INFO L236 CfgBuilder]: Building ICFG [2021-11-20 23:57:12,241 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-20 23:57:12,479 INFO L277 CfgBuilder]: Performing block encoding [2021-11-20 23:57:12,553 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-20 23:57:12,555 INFO L301 CfgBuilder]: Removed 4 assume(true) statements. [2021-11-20 23:57:12,559 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 11:57:12 BoogieIcfgContainer [2021-11-20 23:57:12,559 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-20 23:57:12,561 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-20 23:57:12,561 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-20 23:57:12,564 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-20 23:57:12,565 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.11 11:57:11" (1/3) ... [2021-11-20 23:57:12,566 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6e9a44ea and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 11:57:12, skipping insertion in model container [2021-11-20 23:57:12,566 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:57:12" (2/3) ... [2021-11-20 23:57:12,567 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6e9a44ea and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 11:57:12, skipping insertion in model container [2021-11-20 23:57:12,567 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 11:57:12" (3/3) ... [2021-11-20 23:57:12,568 INFO L111 eAbstractionObserver]: Analyzing ICFG standard_compareModified_ground.i [2021-11-20 23:57:12,574 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-20 23:57:12,575 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-20 23:57:12,637 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-20 23:57:12,649 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-20 23:57:12,649 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-20 23:57:12,679 INFO L276 IsEmpty]: Start isEmpty. Operand has 18 states, 13 states have (on average 1.5384615384615385) internal successors, (20), 14 states have internal predecessors, (20), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-20 23:57:12,684 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-11-20 23:57:12,684 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:57:12,685 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:57:12,686 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:57:12,693 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:57:12,693 INFO L85 PathProgramCache]: Analyzing trace with hash 1259005784, now seen corresponding path program 1 times [2021-11-20 23:57:12,704 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:57:12,705 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1719568862] [2021-11-20 23:57:12,705 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:57:12,707 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:57:12,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:57:12,937 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:57:12,938 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:57:12,938 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1719568862] [2021-11-20 23:57:12,939 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1719568862] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:57:12,941 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:57:12,941 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-20 23:57:12,943 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [412356203] [2021-11-20 23:57:12,944 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:57:12,949 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 23:57:12,950 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:57:12,997 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 23:57:13,000 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 23:57:13,003 INFO L87 Difference]: Start difference. First operand has 18 states, 13 states have (on average 1.5384615384615385) internal successors, (20), 14 states have internal predecessors, (20), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Second operand has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:57:13,090 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:57:13,091 INFO L93 Difference]: Finished difference Result 35 states and 49 transitions. [2021-11-20 23:57:13,093 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 23:57:13,094 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2021-11-20 23:57:13,095 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:57:13,104 INFO L225 Difference]: With dead ends: 35 [2021-11-20 23:57:13,105 INFO L226 Difference]: Without dead ends: 18 [2021-11-20 23:57:13,109 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 23:57:13,115 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 0 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 17 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 17 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 17 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:57:13,117 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 28 Invalid, 17 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 17 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:57:13,145 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2021-11-20 23:57:13,167 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2021-11-20 23:57:13,168 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 14 states have (on average 1.3571428571428572) internal successors, (19), 14 states have internal predecessors, (19), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-20 23:57:13,170 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 23 transitions. [2021-11-20 23:57:13,172 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 23 transitions. Word has length 9 [2021-11-20 23:57:13,172 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:57:13,172 INFO L470 AbstractCegarLoop]: Abstraction has 18 states and 23 transitions. [2021-11-20 23:57:13,173 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:57:13,174 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 23 transitions. [2021-11-20 23:57:13,176 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-11-20 23:57:13,176 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:57:13,177 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:57:13,177 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-20 23:57:13,178 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:57:13,180 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:57:13,180 INFO L85 PathProgramCache]: Analyzing trace with hash 1981076570, now seen corresponding path program 1 times [2021-11-20 23:57:13,181 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:57:13,182 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1360808425] [2021-11-20 23:57:13,182 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:57:13,182 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:57:13,220 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:57:13,270 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:57:13,271 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:57:13,271 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1360808425] [2021-11-20 23:57:13,272 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1360808425] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:57:13,272 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1301493242] [2021-11-20 23:57:13,273 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:57:13,273 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:57:13,273 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21c6c84-752b-41d7-b6ad-3739bf9fae1a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:57:13,282 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21c6c84-752b-41d7-b6ad-3739bf9fae1a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:57:13,293 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21c6c84-752b-41d7-b6ad-3739bf9fae1a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-20 23:57:13,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:57:13,338 INFO L263 TraceCheckSpWp]: Trace formula consists of 74 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-20 23:57:13,343 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:57:13,384 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:57:13,385 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-20 23:57:13,385 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1301493242] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:57:13,385 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-20 23:57:13,386 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [3] total 4 [2021-11-20 23:57:13,386 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [797854740] [2021-11-20 23:57:13,387 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:57:13,387 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 23:57:13,388 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:57:13,388 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 23:57:13,388 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-20 23:57:13,389 INFO L87 Difference]: Start difference. First operand 18 states and 23 transitions. Second operand has 3 states, 3 states have (on average 3.0) internal successors, (9), 2 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:57:13,426 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:57:13,441 INFO L93 Difference]: Finished difference Result 33 states and 42 transitions. [2021-11-20 23:57:13,442 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 23:57:13,442 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.0) internal successors, (9), 2 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2021-11-20 23:57:13,442 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:57:13,443 INFO L225 Difference]: With dead ends: 33 [2021-11-20 23:57:13,443 INFO L226 Difference]: Without dead ends: 19 [2021-11-20 23:57:13,444 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-20 23:57:13,445 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 0 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 13 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 13 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 23:57:13,446 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 28 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 23:57:13,447 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2021-11-20 23:57:13,450 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2021-11-20 23:57:13,450 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 15 states have (on average 1.3333333333333333) internal successors, (20), 15 states have internal predecessors, (20), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-20 23:57:13,451 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 24 transitions. [2021-11-20 23:57:13,452 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 24 transitions. Word has length 10 [2021-11-20 23:57:13,452 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:57:13,452 INFO L470 AbstractCegarLoop]: Abstraction has 19 states and 24 transitions. [2021-11-20 23:57:13,452 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.0) internal successors, (9), 2 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:57:13,453 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 24 transitions. [2021-11-20 23:57:13,453 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-20 23:57:13,453 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:57:13,454 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:57:13,527 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21c6c84-752b-41d7-b6ad-3739bf9fae1a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-20 23:57:13,673 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21c6c84-752b-41d7-b6ad-3739bf9fae1a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2021-11-20 23:57:13,673 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:57:13,674 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:57:13,674 INFO L85 PathProgramCache]: Analyzing trace with hash 252948675, now seen corresponding path program 1 times [2021-11-20 23:57:13,674 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:57:13,674 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1699831239] [2021-11-20 23:57:13,674 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:57:13,675 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:57:13,700 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:57:13,740 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:57:13,741 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:57:13,742 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1699831239] [2021-11-20 23:57:13,742 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1699831239] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:57:13,742 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [999715376] [2021-11-20 23:57:13,744 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:57:13,745 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:57:13,746 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21c6c84-752b-41d7-b6ad-3739bf9fae1a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:57:13,759 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21c6c84-752b-41d7-b6ad-3739bf9fae1a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:57:13,769 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21c6c84-752b-41d7-b6ad-3739bf9fae1a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-20 23:57:13,823 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:57:13,825 INFO L263 TraceCheckSpWp]: Trace formula consists of 79 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-20 23:57:13,826 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:57:13,876 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:57:13,876 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:57:13,919 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:57:13,920 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [999715376] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:57:13,920 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2074779363] [2021-11-20 23:57:13,944 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:57:13,945 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:57:13,954 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:57:13,960 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:57:13,960 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:57:14,074 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:57:14,077 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:57:14,078 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:57:14,081 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:57:14,083 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:57:14,166 INFO L354 Elim1Store]: treesize reduction 129, result has 17.8 percent of original size [2021-11-20 23:57:14,167 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 9 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 11 case distinctions, treesize of input 55 treesize of output 73 [2021-11-20 23:57:14,239 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:57:14,240 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:57:14,241 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:57:14,243 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 11 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 32 [2021-11-20 23:57:14,459 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:57:14,461 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:57:14,463 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 6 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 58 treesize of output 51 [2021-11-20 23:57:14,735 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:57:14,736 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:57:14,740 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:57:14,741 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:57:14,742 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:57:14,833 INFO L354 Elim1Store]: treesize reduction 250, result has 15.5 percent of original size [2021-11-20 23:57:14,834 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 9 case distinctions, treesize of input 344 treesize of output 334 [2021-11-20 23:57:16,415 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:57:16,428 INFO L354 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2021-11-20 23:57:16,429 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 59 treesize of output 45 [2021-11-20 23:57:16,595 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:57:16,597 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:57:16,628 INFO L354 Elim1Store]: treesize reduction 38, result has 49.3 percent of original size [2021-11-20 23:57:16,629 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 84 treesize of output 71 [2021-11-20 23:57:16,906 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:57:16,907 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:57:16,944 INFO L354 Elim1Store]: treesize reduction 38, result has 49.3 percent of original size [2021-11-20 23:57:16,944 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 81 treesize of output 68 [2021-11-20 23:57:17,645 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 36 for LOIs [2021-11-20 23:57:18,110 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:57:18,455 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:57:18,455 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:57:18,455 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2021-11-20 23:57:18,455 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1095511389] [2021-11-20 23:57:18,455 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:57:18,456 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-20 23:57:18,456 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:57:18,456 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-20 23:57:18,457 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=164, Unknown=0, NotChecked=0, Total=210 [2021-11-20 23:57:18,457 INFO L87 Difference]: Start difference. First operand 19 states and 24 transitions. Second operand has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 6 states have internal predecessors, (15), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:57:18,503 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:57:18,504 INFO L93 Difference]: Finished difference Result 38 states and 50 transitions. [2021-11-20 23:57:18,504 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-20 23:57:18,504 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 6 states have internal predecessors, (15), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2021-11-20 23:57:18,505 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:57:18,505 INFO L225 Difference]: With dead ends: 38 [2021-11-20 23:57:18,505 INFO L226 Difference]: Without dead ends: 22 [2021-11-20 23:57:18,506 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 58 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=46, Invalid=164, Unknown=0, NotChecked=0, Total=210 [2021-11-20 23:57:18,507 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 0 mSDsluCounter, 38 mSDsCounter, 0 mSdLazyCounter, 25 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 42 SdHoareTripleChecker+Invalid, 28 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 25 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 23:57:18,508 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 42 Invalid, 28 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 25 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 23:57:18,509 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2021-11-20 23:57:18,512 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2021-11-20 23:57:18,512 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 18 states have (on average 1.2777777777777777) internal successors, (23), 18 states have internal predecessors, (23), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-20 23:57:18,513 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 27 transitions. [2021-11-20 23:57:18,514 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 27 transitions. Word has length 11 [2021-11-20 23:57:18,514 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:57:18,514 INFO L470 AbstractCegarLoop]: Abstraction has 22 states and 27 transitions. [2021-11-20 23:57:18,514 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 6 states have internal predecessors, (15), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:57:18,515 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 27 transitions. [2021-11-20 23:57:18,515 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-11-20 23:57:18,515 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:57:18,516 INFO L514 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:57:18,554 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21c6c84-752b-41d7-b6ad-3739bf9fae1a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-20 23:57:18,737 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21c6c84-752b-41d7-b6ad-3739bf9fae1a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:57:18,737 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:57:18,738 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:57:18,738 INFO L85 PathProgramCache]: Analyzing trace with hash -1580081915, now seen corresponding path program 2 times [2021-11-20 23:57:18,738 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:57:18,738 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [873761371] [2021-11-20 23:57:18,738 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:57:18,739 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:57:18,768 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:57:18,821 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-20 23:57:18,823 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:57:18,824 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [873761371] [2021-11-20 23:57:18,828 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [873761371] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:57:18,830 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [376047242] [2021-11-20 23:57:18,831 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:57:18,831 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:57:18,831 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21c6c84-752b-41d7-b6ad-3739bf9fae1a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:57:18,832 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21c6c84-752b-41d7-b6ad-3739bf9fae1a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:57:18,855 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21c6c84-752b-41d7-b6ad-3739bf9fae1a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-20 23:57:18,906 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-20 23:57:18,906 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:57:18,908 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-20 23:57:18,909 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:57:18,943 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-20 23:57:18,943 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:57:18,977 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-20 23:57:18,978 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [376047242] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:57:18,978 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2142334711] [2021-11-20 23:57:18,980 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:57:18,981 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:57:18,981 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:57:18,981 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:57:18,981 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:57:19,026 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:57:19,028 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:57:19,030 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:57:19,031 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:57:19,086 INFO L354 Elim1Store]: treesize reduction 129, result has 17.8 percent of original size [2021-11-20 23:57:19,087 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 9 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 11 case distinctions, treesize of input 55 treesize of output 73 [2021-11-20 23:57:19,164 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:57:19,166 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:57:19,167 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:57:19,169 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 11 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 32 [2021-11-20 23:57:19,316 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:57:19,317 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:57:19,319 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 7 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 58 treesize of output 51 [2021-11-20 23:57:19,520 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:57:19,521 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:57:19,525 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:57:19,527 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:57:19,528 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:57:19,608 INFO L354 Elim1Store]: treesize reduction 250, result has 15.5 percent of original size [2021-11-20 23:57:19,609 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 9 case distinctions, treesize of input 344 treesize of output 334 [2021-11-20 23:57:20,996 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:57:21,008 INFO L354 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2021-11-20 23:57:21,009 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 59 treesize of output 45 [2021-11-20 23:57:21,188 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:57:21,188 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:57:21,219 INFO L354 Elim1Store]: treesize reduction 38, result has 49.3 percent of original size [2021-11-20 23:57:21,219 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 84 treesize of output 71 [2021-11-20 23:57:21,449 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:57:21,450 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:57:21,481 INFO L354 Elim1Store]: treesize reduction 38, result has 49.3 percent of original size [2021-11-20 23:57:21,482 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 81 treesize of output 68 [2021-11-20 23:57:22,097 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 36 for LOIs [2021-11-20 23:57:22,518 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:57:22,789 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:57:22,790 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:57:22,790 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2021-11-20 23:57:22,790 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [881234866] [2021-11-20 23:57:22,790 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:57:22,791 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-20 23:57:22,791 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:57:22,791 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-20 23:57:22,792 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=159, Unknown=0, NotChecked=0, Total=210 [2021-11-20 23:57:22,792 INFO L87 Difference]: Start difference. First operand 22 states and 27 transitions. Second operand has 7 states, 7 states have (on average 2.7142857142857144) internal successors, (19), 6 states have internal predecessors, (19), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:57:22,820 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:57:22,820 INFO L93 Difference]: Finished difference Result 39 states and 50 transitions. [2021-11-20 23:57:22,820 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-20 23:57:22,821 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.7142857142857144) internal successors, (19), 6 states have internal predecessors, (19), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2021-11-20 23:57:22,821 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:57:22,821 INFO L225 Difference]: With dead ends: 39 [2021-11-20 23:57:22,822 INFO L226 Difference]: Without dead ends: 25 [2021-11-20 23:57:22,822 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 66 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=51, Invalid=159, Unknown=0, NotChecked=0, Total=210 [2021-11-20 23:57:22,823 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 4 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 17 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 21 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 17 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 23:57:22,824 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4 Valid, 28 Invalid, 21 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 17 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 23:57:22,825 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2021-11-20 23:57:22,828 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2021-11-20 23:57:22,828 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 21 states have (on average 1.2380952380952381) internal successors, (26), 21 states have internal predecessors, (26), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-20 23:57:22,829 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 30 transitions. [2021-11-20 23:57:22,829 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 30 transitions. Word has length 14 [2021-11-20 23:57:22,829 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:57:22,829 INFO L470 AbstractCegarLoop]: Abstraction has 25 states and 30 transitions. [2021-11-20 23:57:22,830 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.7142857142857144) internal successors, (19), 6 states have internal predecessors, (19), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:57:22,830 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 30 transitions. [2021-11-20 23:57:22,830 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-11-20 23:57:22,831 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:57:22,831 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:57:22,856 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21c6c84-752b-41d7-b6ad-3739bf9fae1a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-20 23:57:23,045 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21c6c84-752b-41d7-b6ad-3739bf9fae1a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:57:23,045 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:57:23,046 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:57:23,046 INFO L85 PathProgramCache]: Analyzing trace with hash -843220200, now seen corresponding path program 3 times [2021-11-20 23:57:23,046 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:57:23,046 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2070072249] [2021-11-20 23:57:23,046 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:57:23,046 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:57:23,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:57:23,134 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-20 23:57:23,135 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:57:23,135 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2070072249] [2021-11-20 23:57:23,135 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2070072249] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:57:23,135 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1814406405] [2021-11-20 23:57:23,136 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:57:23,138 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:57:23,138 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21c6c84-752b-41d7-b6ad-3739bf9fae1a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:57:23,139 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21c6c84-752b-41d7-b6ad-3739bf9fae1a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:57:23,161 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21c6c84-752b-41d7-b6ad-3739bf9fae1a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-20 23:57:23,215 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:57:23,216 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:57:23,217 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-20 23:57:23,219 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:57:23,254 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-20 23:57:23,254 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:57:23,325 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-20 23:57:23,325 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1814406405] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:57:23,325 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [354410196] [2021-11-20 23:57:23,330 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:57:23,331 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:57:23,333 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:57:23,333 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:57:23,334 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:57:23,379 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:57:23,381 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:57:23,382 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:57:23,384 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:57:23,387 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:57:23,444 INFO L354 Elim1Store]: treesize reduction 129, result has 17.8 percent of original size [2021-11-20 23:57:23,444 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 9 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 11 case distinctions, treesize of input 55 treesize of output 73 [2021-11-20 23:57:23,498 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:57:23,501 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:57:23,502 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:57:23,505 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 11 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 32 [2021-11-20 23:57:23,652 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:57:23,653 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:57:23,654 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 6 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 73 treesize of output 61 [2021-11-20 23:57:23,803 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:57:23,804 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:57:23,809 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:57:23,811 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:57:23,813 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:57:23,815 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:57:23,816 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:57:23,818 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:57:23,819 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:57:23,863 INFO L354 Elim1Store]: treesize reduction 142, result has 12.3 percent of original size [2021-11-20 23:57:23,864 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 7 case distinctions, treesize of input 364 treesize of output 332 [2021-11-20 23:57:24,359 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:57:24,373 INFO L354 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2021-11-20 23:57:24,373 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 59 treesize of output 45 [2021-11-20 23:57:24,548 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:57:24,549 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:57:24,576 INFO L354 Elim1Store]: treesize reduction 38, result has 49.3 percent of original size [2021-11-20 23:57:24,576 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 84 treesize of output 71 [2021-11-20 23:57:24,795 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:57:24,796 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:57:24,829 INFO L354 Elim1Store]: treesize reduction 38, result has 49.3 percent of original size [2021-11-20 23:57:24,830 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 81 treesize of output 68 [2021-11-20 23:57:25,385 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 36 for LOIs [2021-11-20 23:57:25,847 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:57:26,128 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:57:26,128 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:57:26,128 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 12 [2021-11-20 23:57:26,128 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1192380473] [2021-11-20 23:57:26,128 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:57:26,129 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-20 23:57:26,129 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:57:26,129 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-20 23:57:26,130 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=317, Unknown=0, NotChecked=0, Total=420 [2021-11-20 23:57:26,130 INFO L87 Difference]: Start difference. First operand 25 states and 30 transitions. Second operand has 13 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 12 states have internal predecessors, (21), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:57:26,171 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:57:26,171 INFO L93 Difference]: Finished difference Result 50 states and 65 transitions. [2021-11-20 23:57:26,171 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-20 23:57:26,171 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 12 states have internal predecessors, (21), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 17 [2021-11-20 23:57:26,171 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:57:26,172 INFO L225 Difference]: With dead ends: 50 [2021-11-20 23:57:26,172 INFO L226 Difference]: Without dead ends: 31 [2021-11-20 23:57:26,174 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 142 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=103, Invalid=317, Unknown=0, NotChecked=0, Total=420 [2021-11-20 23:57:26,175 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 0 mSDsluCounter, 38 mSDsCounter, 0 mSdLazyCounter, 31 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 42 SdHoareTripleChecker+Invalid, 40 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 31 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 23:57:26,175 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 42 Invalid, 40 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 31 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 23:57:26,176 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2021-11-20 23:57:26,179 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2021-11-20 23:57:26,180 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 27 states have (on average 1.1851851851851851) internal successors, (32), 27 states have internal predecessors, (32), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-20 23:57:26,180 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 36 transitions. [2021-11-20 23:57:26,181 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 36 transitions. Word has length 17 [2021-11-20 23:57:26,181 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:57:26,181 INFO L470 AbstractCegarLoop]: Abstraction has 31 states and 36 transitions. [2021-11-20 23:57:26,181 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 12 states have internal predecessors, (21), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:57:26,181 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 36 transitions. [2021-11-20 23:57:26,182 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-11-20 23:57:26,182 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:57:26,182 INFO L514 BasicCegarLoop]: trace histogram [10, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:57:26,209 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21c6c84-752b-41d7-b6ad-3739bf9fae1a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-20 23:57:26,401 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21c6c84-752b-41d7-b6ad-3739bf9fae1a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:57:26,401 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:57:26,401 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:57:26,401 INFO L85 PathProgramCache]: Analyzing trace with hash 1290300376, now seen corresponding path program 4 times [2021-11-20 23:57:26,402 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:57:26,402 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [816973516] [2021-11-20 23:57:26,402 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:57:26,402 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:57:26,433 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:57:26,547 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-20 23:57:26,547 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:57:26,547 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [816973516] [2021-11-20 23:57:26,548 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [816973516] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:57:26,548 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1693472033] [2021-11-20 23:57:26,548 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:57:26,548 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:57:26,549 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21c6c84-752b-41d7-b6ad-3739bf9fae1a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:57:26,553 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21c6c84-752b-41d7-b6ad-3739bf9fae1a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:57:26,556 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21c6c84-752b-41d7-b6ad-3739bf9fae1a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-20 23:57:26,609 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:57:26,610 INFO L263 TraceCheckSpWp]: Trace formula consists of 166 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-20 23:57:26,612 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:57:26,663 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-20 23:57:26,663 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:57:26,859 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-20 23:57:26,859 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1693472033] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:57:26,860 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [897450465] [2021-11-20 23:57:26,863 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:57:26,863 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:57:26,863 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:57:26,863 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:57:26,864 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:57:26,881 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:57:26,882 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:57:26,883 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:57:26,920 INFO L354 Elim1Store]: treesize reduction 83, result has 23.9 percent of original size [2021-11-20 23:57:26,921 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 7 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 23 treesize of output 42 [2021-11-20 23:57:26,962 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:57:26,964 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:57:26,971 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:57:26,973 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:57:26,974 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:57:27,022 INFO L354 Elim1Store]: treesize reduction 129, result has 17.8 percent of original size [2021-11-20 23:57:27,022 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 9 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 11 case distinctions, treesize of input 55 treesize of output 73 [2021-11-20 23:57:27,156 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:57:27,157 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:57:27,159 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 6 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 58 treesize of output 51 [2021-11-20 23:57:27,356 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:57:27,357 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:57:27,359 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:57:27,365 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:57:27,366 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:57:27,438 INFO L354 Elim1Store]: treesize reduction 250, result has 15.5 percent of original size [2021-11-20 23:57:27,439 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 9 case distinctions, treesize of input 344 treesize of output 334 [2021-11-20 23:57:28,593 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:57:28,603 INFO L354 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2021-11-20 23:57:28,604 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 59 treesize of output 45 [2021-11-20 23:57:28,767 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:57:28,768 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:57:28,794 INFO L354 Elim1Store]: treesize reduction 38, result has 49.3 percent of original size [2021-11-20 23:57:28,794 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 84 treesize of output 71 [2021-11-20 23:57:28,987 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:57:28,988 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:57:29,020 INFO L354 Elim1Store]: treesize reduction 38, result has 49.3 percent of original size [2021-11-20 23:57:29,020 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 81 treesize of output 68 [2021-11-20 23:57:29,482 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 36 for LOIs [2021-11-20 23:57:29,955 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:57:30,246 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:57:30,246 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:57:30,246 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 24 [2021-11-20 23:57:30,246 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1242712798] [2021-11-20 23:57:30,247 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:57:30,247 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-11-20 23:57:30,247 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:57:30,247 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-11-20 23:57:30,248 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=325, Invalid=731, Unknown=0, NotChecked=0, Total=1056 [2021-11-20 23:57:30,248 INFO L87 Difference]: Start difference. First operand 31 states and 36 transitions. Second operand has 25 states, 25 states have (on average 1.32) internal successors, (33), 24 states have internal predecessors, (33), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:57:30,312 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:57:30,312 INFO L93 Difference]: Finished difference Result 62 states and 83 transitions. [2021-11-20 23:57:30,312 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-11-20 23:57:30,312 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.32) internal successors, (33), 24 states have internal predecessors, (33), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 23 [2021-11-20 23:57:30,313 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:57:30,313 INFO L225 Difference]: With dead ends: 62 [2021-11-20 23:57:30,314 INFO L226 Difference]: Without dead ends: 43 [2021-11-20 23:57:30,315 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 310 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=325, Invalid=731, Unknown=0, NotChecked=0, Total=1056 [2021-11-20 23:57:30,316 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 0 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 49 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 63 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 49 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:57:30,316 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 56 Invalid, 63 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 49 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:57:30,317 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2021-11-20 23:57:30,321 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2021-11-20 23:57:30,322 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 39 states have (on average 1.1282051282051282) internal successors, (44), 39 states have internal predecessors, (44), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-20 23:57:30,323 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 48 transitions. [2021-11-20 23:57:30,323 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 48 transitions. Word has length 23 [2021-11-20 23:57:30,323 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:57:30,323 INFO L470 AbstractCegarLoop]: Abstraction has 43 states and 48 transitions. [2021-11-20 23:57:30,324 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 1.32) internal successors, (33), 24 states have internal predecessors, (33), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:57:30,324 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 48 transitions. [2021-11-20 23:57:30,325 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-11-20 23:57:30,325 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:57:30,325 INFO L514 BasicCegarLoop]: trace histogram [22, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:57:30,349 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21c6c84-752b-41d7-b6ad-3739bf9fae1a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-20 23:57:30,532 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21c6c84-752b-41d7-b6ad-3739bf9fae1a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:57:30,533 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:57:30,533 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:57:30,533 INFO L85 PathProgramCache]: Analyzing trace with hash -1856791208, now seen corresponding path program 5 times [2021-11-20 23:57:30,533 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:57:30,534 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1753527257] [2021-11-20 23:57:30,534 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:57:30,534 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:57:30,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:57:30,859 INFO L134 CoverageAnalysis]: Checked inductivity of 263 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-20 23:57:30,859 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:57:30,859 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1753527257] [2021-11-20 23:57:30,859 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1753527257] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:57:30,860 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1554420194] [2021-11-20 23:57:30,860 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:57:30,860 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:57:30,860 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21c6c84-752b-41d7-b6ad-3739bf9fae1a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:57:30,871 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21c6c84-752b-41d7-b6ad-3739bf9fae1a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:57:30,872 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21c6c84-752b-41d7-b6ad-3739bf9fae1a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-20 23:57:30,922 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-20 23:57:30,923 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:57:30,924 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-20 23:57:30,926 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:57:31,068 INFO L134 CoverageAnalysis]: Checked inductivity of 263 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2021-11-20 23:57:31,069 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:57:31,215 INFO L134 CoverageAnalysis]: Checked inductivity of 263 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2021-11-20 23:57:31,216 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1554420194] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:57:31,216 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [706304976] [2021-11-20 23:57:31,218 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:57:31,218 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:57:31,218 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:57:31,218 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:57:31,219 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:57:31,252 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:57:31,254 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:57:31,255 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:57:31,300 INFO L354 Elim1Store]: treesize reduction 129, result has 17.8 percent of original size [2021-11-20 23:57:31,300 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 9 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 11 case distinctions, treesize of input 55 treesize of output 73 [2021-11-20 23:57:31,363 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:57:31,363 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:57:31,364 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:57:31,365 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 10 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 32 [2021-11-20 23:57:31,458 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:57:31,459 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:57:31,460 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 6 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 73 treesize of output 61 [2021-11-20 23:57:31,623 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:57:31,624 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:57:31,627 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:57:31,628 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:57:31,629 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:57:31,630 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:57:31,631 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:57:31,633 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:57:31,634 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:57:31,679 INFO L354 Elim1Store]: treesize reduction 142, result has 12.3 percent of original size [2021-11-20 23:57:31,680 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 7 case distinctions, treesize of input 364 treesize of output 332 [2021-11-20 23:57:32,078 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:57:32,090 INFO L354 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2021-11-20 23:57:32,091 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 59 treesize of output 45 [2021-11-20 23:57:32,249 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:57:32,250 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:57:32,276 INFO L354 Elim1Store]: treesize reduction 38, result has 49.3 percent of original size [2021-11-20 23:57:32,278 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 84 treesize of output 71 [2021-11-20 23:57:32,469 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:57:32,470 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:57:32,504 INFO L354 Elim1Store]: treesize reduction 38, result has 49.3 percent of original size [2021-11-20 23:57:32,504 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 81 treesize of output 68 [2021-11-20 23:57:33,089 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 36 for LOIs [2021-11-20 23:57:33,447 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:57:33,811 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:57:33,811 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:57:33,811 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 6, 6] total 34 [2021-11-20 23:57:33,811 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [358874678] [2021-11-20 23:57:33,811 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:57:33,812 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2021-11-20 23:57:33,812 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:57:33,813 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-11-20 23:57:33,814 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=400, Invalid=1406, Unknown=0, NotChecked=0, Total=1806 [2021-11-20 23:57:33,814 INFO L87 Difference]: Start difference. First operand 43 states and 48 transitions. Second operand has 35 states, 35 states have (on average 1.3428571428571427) internal successors, (47), 34 states have internal predecessors, (47), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:57:34,300 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:57:34,301 INFO L93 Difference]: Finished difference Result 69 states and 85 transitions. [2021-11-20 23:57:34,301 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-11-20 23:57:34,301 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.3428571428571427) internal successors, (47), 34 states have internal predecessors, (47), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 35 [2021-11-20 23:57:34,302 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:57:34,302 INFO L225 Difference]: With dead ends: 69 [2021-11-20 23:57:34,302 INFO L226 Difference]: Without dead ends: 50 [2021-11-20 23:57:34,305 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 86 SyntacticMatches, 0 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 862 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=1205, Invalid=3085, Unknown=0, NotChecked=0, Total=4290 [2021-11-20 23:57:34,306 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 4 mSDsluCounter, 124 mSDsCounter, 0 mSdLazyCounter, 79 mSolverCounterSat, 56 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 112 SdHoareTripleChecker+Invalid, 135 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 56 IncrementalHoareTripleChecker+Valid, 79 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:57:34,306 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4 Valid, 112 Invalid, 135 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [56 Valid, 79 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:57:34,307 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2021-11-20 23:57:34,312 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2021-11-20 23:57:34,312 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 46 states have (on average 1.108695652173913) internal successors, (51), 46 states have internal predecessors, (51), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-20 23:57:34,313 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 55 transitions. [2021-11-20 23:57:34,314 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 55 transitions. Word has length 35 [2021-11-20 23:57:34,314 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:57:34,314 INFO L470 AbstractCegarLoop]: Abstraction has 50 states and 55 transitions. [2021-11-20 23:57:34,314 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 1.3428571428571427) internal successors, (47), 34 states have internal predecessors, (47), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:57:34,314 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 55 transitions. [2021-11-20 23:57:34,316 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-11-20 23:57:34,316 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:57:34,316 INFO L514 BasicCegarLoop]: trace histogram [23, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:57:34,352 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21c6c84-752b-41d7-b6ad-3739bf9fae1a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-20 23:57:34,538 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21c6c84-752b-41d7-b6ad-3739bf9fae1a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-11-20 23:57:34,538 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:57:34,538 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:57:34,539 INFO L85 PathProgramCache]: Analyzing trace with hash -1217782982, now seen corresponding path program 6 times [2021-11-20 23:57:34,539 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:57:34,539 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1446280157] [2021-11-20 23:57:34,539 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:57:34,539 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:57:34,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:57:34,909 INFO L134 CoverageAnalysis]: Checked inductivity of 331 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-11-20 23:57:34,910 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:57:34,910 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1446280157] [2021-11-20 23:57:34,910 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1446280157] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:57:34,910 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2102690418] [2021-11-20 23:57:34,910 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:57:34,911 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:57:34,911 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21c6c84-752b-41d7-b6ad-3739bf9fae1a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:57:34,925 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21c6c84-752b-41d7-b6ad-3739bf9fae1a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:57:34,926 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21c6c84-752b-41d7-b6ad-3739bf9fae1a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-20 23:57:35,001 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:57:35,001 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:57:35,004 INFO L263 TraceCheckSpWp]: Trace formula consists of 300 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-20 23:57:35,007 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:57:35,090 INFO L134 CoverageAnalysis]: Checked inductivity of 331 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-11-20 23:57:35,091 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:57:35,862 INFO L134 CoverageAnalysis]: Checked inductivity of 331 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-11-20 23:57:35,863 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2102690418] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:57:35,863 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [354822198] [2021-11-20 23:57:35,865 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:57:35,865 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:57:35,865 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:57:35,866 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:57:35,866 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:57:35,902 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:57:35,904 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:57:35,905 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:57:35,952 INFO L354 Elim1Store]: treesize reduction 83, result has 23.9 percent of original size [2021-11-20 23:57:35,952 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 23 treesize of output 42 [2021-11-20 23:57:35,989 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:57:35,992 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:57:35,993 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:57:35,996 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:57:35,997 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:57:36,054 INFO L354 Elim1Store]: treesize reduction 129, result has 17.8 percent of original size [2021-11-20 23:57:36,054 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 9 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 11 case distinctions, treesize of input 55 treesize of output 73 [2021-11-20 23:57:36,172 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:57:36,173 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:57:36,174 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 7 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 58 treesize of output 51 [2021-11-20 23:57:36,361 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:57:36,362 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:57:36,364 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:57:36,365 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:57:36,366 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:57:36,444 INFO L354 Elim1Store]: treesize reduction 250, result has 15.5 percent of original size [2021-11-20 23:57:36,445 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 9 case distinctions, treesize of input 344 treesize of output 334 [2021-11-20 23:57:37,599 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:57:37,609 INFO L354 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2021-11-20 23:57:37,610 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 59 treesize of output 45 [2021-11-20 23:57:37,719 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:57:37,719 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:57:37,754 INFO L354 Elim1Store]: treesize reduction 38, result has 49.3 percent of original size [2021-11-20 23:57:37,755 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 84 treesize of output 71 [2021-11-20 23:57:37,938 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:57:37,939 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:57:37,963 INFO L354 Elim1Store]: treesize reduction 38, result has 49.3 percent of original size [2021-11-20 23:57:37,963 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 81 treesize of output 68 [2021-11-20 23:57:38,499 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 36 for LOIs [2021-11-20 23:57:38,913 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:57:39,297 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:57:39,298 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:57:39,298 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 50 [2021-11-20 23:57:39,298 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1006186148] [2021-11-20 23:57:39,298 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:57:39,299 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2021-11-20 23:57:39,299 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:57:39,300 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2021-11-20 23:57:39,302 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1300, Invalid=2122, Unknown=0, NotChecked=0, Total=3422 [2021-11-20 23:57:39,302 INFO L87 Difference]: Start difference. First operand 50 states and 55 transitions. Second operand has 51 states, 51 states have (on average 1.1568627450980393) internal successors, (59), 50 states have internal predecessors, (59), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:57:39,428 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:57:39,428 INFO L93 Difference]: Finished difference Result 100 states and 134 transitions. [2021-11-20 23:57:39,428 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2021-11-20 23:57:39,429 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 1.1568627450980393) internal successors, (59), 50 states have internal predecessors, (59), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 42 [2021-11-20 23:57:39,429 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:57:39,432 INFO L225 Difference]: With dead ends: 100 [2021-11-20 23:57:39,432 INFO L226 Difference]: Without dead ends: 75 [2021-11-20 23:57:39,435 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 92 SyntacticMatches, 0 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 674 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1300, Invalid=2122, Unknown=0, NotChecked=0, Total=3422 [2021-11-20 23:57:39,435 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 0 mSDsluCounter, 76 mSDsCounter, 0 mSdLazyCounter, 81 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 70 SdHoareTripleChecker+Invalid, 111 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 81 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:57:39,436 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 70 Invalid, 111 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 81 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:57:39,437 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2021-11-20 23:57:39,454 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 75. [2021-11-20 23:57:39,457 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 71 states have (on average 1.0704225352112675) internal successors, (76), 71 states have internal predecessors, (76), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-20 23:57:39,458 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 80 transitions. [2021-11-20 23:57:39,458 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 80 transitions. Word has length 42 [2021-11-20 23:57:39,458 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:57:39,459 INFO L470 AbstractCegarLoop]: Abstraction has 75 states and 80 transitions. [2021-11-20 23:57:39,459 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 51 states have (on average 1.1568627450980393) internal successors, (59), 50 states have internal predecessors, (59), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:57:39,459 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 80 transitions. [2021-11-20 23:57:39,465 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-11-20 23:57:39,468 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:57:39,468 INFO L514 BasicCegarLoop]: trace histogram [48, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:57:39,508 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21c6c84-752b-41d7-b6ad-3739bf9fae1a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-20 23:57:39,681 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21c6c84-752b-41d7-b6ad-3739bf9fae1a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:57:39,681 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:57:39,681 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:57:39,682 INFO L85 PathProgramCache]: Analyzing trace with hash 939129208, now seen corresponding path program 7 times [2021-11-20 23:57:39,682 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:57:39,682 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [648558404] [2021-11-20 23:57:39,682 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:57:39,682 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:57:39,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:57:40,850 INFO L134 CoverageAnalysis]: Checked inductivity of 1231 backedges. 0 proven. 1176 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-11-20 23:57:40,850 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:57:40,850 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [648558404] [2021-11-20 23:57:40,851 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [648558404] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:57:40,851 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [15960544] [2021-11-20 23:57:40,851 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:57:40,851 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:57:40,851 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21c6c84-752b-41d7-b6ad-3739bf9fae1a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:57:40,853 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21c6c84-752b-41d7-b6ad-3739bf9fae1a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:57:40,875 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21c6c84-752b-41d7-b6ad-3739bf9fae1a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-20 23:57:40,969 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:57:40,973 INFO L263 TraceCheckSpWp]: Trace formula consists of 500 conjuncts, 50 conjunts are in the unsatisfiable core [2021-11-20 23:57:40,977 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:57:41,147 INFO L134 CoverageAnalysis]: Checked inductivity of 1231 backedges. 0 proven. 1176 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-11-20 23:57:41,147 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:57:43,730 INFO L134 CoverageAnalysis]: Checked inductivity of 1231 backedges. 0 proven. 1176 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-11-20 23:57:43,730 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [15960544] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:57:43,731 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [595534871] [2021-11-20 23:57:43,732 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:57:43,733 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:57:43,733 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:57:43,733 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:57:43,733 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:57:43,766 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:57:43,767 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:57:43,768 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:57:43,806 INFO L354 Elim1Store]: treesize reduction 83, result has 23.9 percent of original size [2021-11-20 23:57:43,806 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 23 treesize of output 42 [2021-11-20 23:57:43,846 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:57:43,848 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:57:43,849 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:57:43,850 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:57:43,851 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:57:43,921 INFO L354 Elim1Store]: treesize reduction 129, result has 17.8 percent of original size [2021-11-20 23:57:43,922 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 9 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 11 case distinctions, treesize of input 55 treesize of output 73 [2021-11-20 23:57:44,040 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:57:44,042 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:57:44,043 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 6 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 58 treesize of output 51 [2021-11-20 23:57:44,172 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:57:44,174 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:57:44,176 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:57:44,177 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:57:44,178 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:57:44,236 INFO L354 Elim1Store]: treesize reduction 250, result has 15.5 percent of original size [2021-11-20 23:57:44,236 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 9 case distinctions, treesize of input 344 treesize of output 334 [2021-11-20 23:57:45,332 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:57:45,342 INFO L354 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2021-11-20 23:57:45,343 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 59 treesize of output 45 [2021-11-20 23:57:45,473 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:57:45,474 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:57:45,503 INFO L354 Elim1Store]: treesize reduction 38, result has 49.3 percent of original size [2021-11-20 23:57:45,508 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 84 treesize of output 71 [2021-11-20 23:57:45,706 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:57:45,707 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:57:45,737 INFO L354 Elim1Store]: treesize reduction 38, result has 49.3 percent of original size [2021-11-20 23:57:45,738 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 81 treesize of output 68 [2021-11-20 23:57:46,191 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 36 for LOIs [2021-11-20 23:57:46,570 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:57:47,028 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:57:47,028 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:57:47,028 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 50, 50] total 100 [2021-11-20 23:57:47,028 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1311031039] [2021-11-20 23:57:47,028 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:57:47,029 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 101 states [2021-11-20 23:57:47,029 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:57:47,031 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 101 interpolants. [2021-11-20 23:57:47,035 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5075, Invalid=6697, Unknown=0, NotChecked=0, Total=11772 [2021-11-20 23:57:47,035 INFO L87 Difference]: Start difference. First operand 75 states and 80 transitions. Second operand has 101 states, 101 states have (on average 1.0792079207920793) internal successors, (109), 100 states have internal predecessors, (109), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:57:47,239 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:57:47,239 INFO L93 Difference]: Finished difference Result 150 states and 209 transitions. [2021-11-20 23:57:47,239 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 100 states. [2021-11-20 23:57:47,240 INFO L78 Accepts]: Start accepts. Automaton has has 101 states, 101 states have (on average 1.0792079207920793) internal successors, (109), 100 states have internal predecessors, (109), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 67 [2021-11-20 23:57:47,242 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:57:47,243 INFO L225 Difference]: With dead ends: 150 [2021-11-20 23:57:47,243 INFO L226 Difference]: Without dead ends: 125 [2021-11-20 23:57:47,248 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 249 GetRequests, 142 SyntacticMatches, 0 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1374 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=5075, Invalid=6697, Unknown=0, NotChecked=0, Total=11772 [2021-11-20 23:57:47,251 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 0 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 124 mSolverCounterSat, 56 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 180 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 56 IncrementalHoareTripleChecker+Valid, 124 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:57:47,251 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 56 Invalid, 180 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [56 Valid, 124 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:57:47,253 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2021-11-20 23:57:47,277 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 125. [2021-11-20 23:57:47,281 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 125 states, 121 states have (on average 1.0413223140495869) internal successors, (126), 121 states have internal predecessors, (126), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-20 23:57:47,282 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 130 transitions. [2021-11-20 23:57:47,285 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 130 transitions. Word has length 67 [2021-11-20 23:57:47,286 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:57:47,286 INFO L470 AbstractCegarLoop]: Abstraction has 125 states and 130 transitions. [2021-11-20 23:57:47,286 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 101 states, 101 states have (on average 1.0792079207920793) internal successors, (109), 100 states have internal predecessors, (109), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:57:47,287 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 130 transitions. [2021-11-20 23:57:47,288 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2021-11-20 23:57:47,289 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:57:47,289 INFO L514 BasicCegarLoop]: trace histogram [98, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:57:47,329 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21c6c84-752b-41d7-b6ad-3739bf9fae1a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-20 23:57:47,513 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21c6c84-752b-41d7-b6ad-3739bf9fae1a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:57:47,513 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:57:47,513 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:57:47,513 INFO L85 PathProgramCache]: Analyzing trace with hash 760188856, now seen corresponding path program 8 times [2021-11-20 23:57:47,514 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:57:47,514 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [777368269] [2021-11-20 23:57:47,514 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:57:47,514 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:57:47,680 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:57:51,128 INFO L134 CoverageAnalysis]: Checked inductivity of 4906 backedges. 0 proven. 4851 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-11-20 23:57:51,128 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:57:51,128 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [777368269] [2021-11-20 23:57:51,129 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [777368269] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:57:51,129 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [810142781] [2021-11-20 23:57:51,129 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:57:51,129 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:57:51,129 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21c6c84-752b-41d7-b6ad-3739bf9fae1a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:57:51,136 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21c6c84-752b-41d7-b6ad-3739bf9fae1a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:57:51,137 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21c6c84-752b-41d7-b6ad-3739bf9fae1a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-20 23:57:51,824 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-11-20 23:57:51,824 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:57:51,828 INFO L263 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-20 23:57:51,833 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:57:52,473 INFO L134 CoverageAnalysis]: Checked inductivity of 4906 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 4851 trivial. 0 not checked. [2021-11-20 23:57:52,473 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:57:53,189 INFO L134 CoverageAnalysis]: Checked inductivity of 4906 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 4851 trivial. 0 not checked. [2021-11-20 23:57:53,189 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [810142781] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:57:53,189 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [632510884] [2021-11-20 23:57:53,191 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:57:53,191 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:57:53,192 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:57:53,192 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:57:53,192 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:57:53,205 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:57:53,206 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:57:53,207 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:57:53,244 INFO L354 Elim1Store]: treesize reduction 83, result has 23.9 percent of original size [2021-11-20 23:57:53,244 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 7 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 23 treesize of output 42 [2021-11-20 23:57:53,303 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:57:53,305 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:57:53,306 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:57:53,308 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:57:53,309 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:57:53,353 INFO L354 Elim1Store]: treesize reduction 129, result has 17.8 percent of original size [2021-11-20 23:57:53,353 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 9 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 11 case distinctions, treesize of input 55 treesize of output 73 [2021-11-20 23:57:53,434 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:57:53,435 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:57:53,436 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 8 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 73 treesize of output 61 [2021-11-20 23:57:53,651 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:57:53,652 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:57:53,654 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:57:53,655 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:57:53,656 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:57:53,656 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:57:53,657 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:57:53,659 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:57:53,660 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:57:53,686 INFO L354 Elim1Store]: treesize reduction 142, result has 12.3 percent of original size [2021-11-20 23:57:53,686 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 7 case distinctions, treesize of input 364 treesize of output 332 [2021-11-20 23:57:54,003 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:57:54,017 INFO L354 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2021-11-20 23:57:54,017 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 59 treesize of output 45 [2021-11-20 23:57:54,158 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:57:54,159 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:57:54,184 INFO L354 Elim1Store]: treesize reduction 38, result has 49.3 percent of original size [2021-11-20 23:57:54,184 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 84 treesize of output 71 [2021-11-20 23:57:54,349 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:57:54,349 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:57:54,377 INFO L354 Elim1Store]: treesize reduction 38, result has 49.3 percent of original size [2021-11-20 23:57:54,377 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 81 treesize of output 68 [2021-11-20 23:57:54,884 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 36 for LOIs [2021-11-20 23:57:55,230 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:57:56,007 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:57:56,007 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:57:56,007 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [100, 12, 12] total 122 [2021-11-20 23:57:56,008 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1542771119] [2021-11-20 23:57:56,008 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:57:56,008 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 123 states [2021-11-20 23:57:56,009 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:57:56,010 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 123 interpolants. [2021-11-20 23:57:56,015 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5372, Invalid=11658, Unknown=0, NotChecked=0, Total=17030 [2021-11-20 23:57:56,016 INFO L87 Difference]: Start difference. First operand 125 states and 130 transitions. Second operand has 123 states, 123 states have (on average 1.0975609756097562) internal successors, (135), 122 states have internal predecessors, (135), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:58:00,496 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:58:00,496 INFO L93 Difference]: Finished difference Result 163 states and 185 transitions. [2021-11-20 23:58:00,497 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 123 states. [2021-11-20 23:58:00,497 INFO L78 Accepts]: Start accepts. Automaton has has 123 states, 123 states have (on average 1.0975609756097562) internal successors, (135), 122 states have internal predecessors, (135), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 117 [2021-11-20 23:58:00,498 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:58:00,499 INFO L225 Difference]: With dead ends: 163 [2021-11-20 23:58:00,499 INFO L226 Difference]: Without dead ends: 138 [2021-11-20 23:58:00,506 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 548 GetRequests, 320 SyntacticMatches, 0 SemanticMatches, 228 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8458 ImplicationChecksByTransitivity, 8.8s TimeCoverageRelationStatistics Valid=17549, Invalid=35121, Unknown=0, NotChecked=0, Total=52670 [2021-11-20 23:58:00,507 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 10 mSDsluCounter, 105 mSDsCounter, 0 mSdLazyCounter, 159 mSolverCounterSat, 521 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 98 SdHoareTripleChecker+Invalid, 680 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 521 IncrementalHoareTripleChecker+Valid, 159 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-20 23:58:00,507 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 98 Invalid, 680 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [521 Valid, 159 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-20 23:58:00,508 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2021-11-20 23:58:00,515 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 138. [2021-11-20 23:58:00,516 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 138 states, 134 states have (on average 1.037313432835821) internal successors, (139), 134 states have internal predecessors, (139), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-20 23:58:00,517 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 138 states to 138 states and 143 transitions. [2021-11-20 23:58:00,517 INFO L78 Accepts]: Start accepts. Automaton has 138 states and 143 transitions. Word has length 117 [2021-11-20 23:58:00,518 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:58:00,518 INFO L470 AbstractCegarLoop]: Abstraction has 138 states and 143 transitions. [2021-11-20 23:58:00,518 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 123 states, 123 states have (on average 1.0975609756097562) internal successors, (135), 122 states have internal predecessors, (135), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:58:00,519 INFO L276 IsEmpty]: Start isEmpty. Operand 138 states and 143 transitions. [2021-11-20 23:58:00,520 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2021-11-20 23:58:00,520 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:58:00,520 INFO L514 BasicCegarLoop]: trace histogram [99, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:58:00,546 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21c6c84-752b-41d7-b6ad-3739bf9fae1a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-20 23:58:00,733 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21c6c84-752b-41d7-b6ad-3739bf9fae1a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:58:00,733 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:58:00,733 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:58:00,733 INFO L85 PathProgramCache]: Analyzing trace with hash -997656454, now seen corresponding path program 9 times [2021-11-20 23:58:00,734 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:58:00,734 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1259947009] [2021-11-20 23:58:00,734 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:58:00,734 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:58:00,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:58:04,454 INFO L134 CoverageAnalysis]: Checked inductivity of 5203 backedges. 0 proven. 4950 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2021-11-20 23:58:04,454 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:58:04,454 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1259947009] [2021-11-20 23:58:04,456 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1259947009] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:58:04,456 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [143780957] [2021-11-20 23:58:04,456 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:58:04,456 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:58:04,457 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21c6c84-752b-41d7-b6ad-3739bf9fae1a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:58:04,458 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21c6c84-752b-41d7-b6ad-3739bf9fae1a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:58:04,460 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21c6c84-752b-41d7-b6ad-3739bf9fae1a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-20 23:58:04,627 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:58:04,627 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:58:04,633 INFO L263 TraceCheckSpWp]: Trace formula consists of 968 conjuncts, 101 conjunts are in the unsatisfiable core [2021-11-20 23:58:04,639 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:58:04,940 INFO L134 CoverageAnalysis]: Checked inductivity of 5203 backedges. 0 proven. 4950 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2021-11-20 23:58:04,940 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:58:15,227 INFO L134 CoverageAnalysis]: Checked inductivity of 5203 backedges. 0 proven. 4950 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2021-11-20 23:58:15,227 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [143780957] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:58:15,227 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1784066319] [2021-11-20 23:58:15,229 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:58:15,229 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:58:15,229 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:58:15,229 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:58:15,230 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:58:15,251 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:58:15,252 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:58:15,253 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:58:15,293 INFO L354 Elim1Store]: treesize reduction 83, result has 23.9 percent of original size [2021-11-20 23:58:15,293 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 6 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 23 treesize of output 42 [2021-11-20 23:58:15,336 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:58:15,339 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:58:15,339 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:58:15,341 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:58:15,341 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:58:15,386 INFO L354 Elim1Store]: treesize reduction 129, result has 17.8 percent of original size [2021-11-20 23:58:15,387 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 9 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 11 case distinctions, treesize of input 55 treesize of output 73 [2021-11-20 23:58:15,494 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:58:15,495 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:58:15,496 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 7 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 73 treesize of output 61 [2021-11-20 23:58:15,688 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:58:15,689 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:58:15,692 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:58:15,694 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:58:15,695 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:58:15,697 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:58:15,698 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:58:15,701 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:58:15,702 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:58:15,745 INFO L354 Elim1Store]: treesize reduction 142, result has 12.3 percent of original size [2021-11-20 23:58:15,746 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 7 case distinctions, treesize of input 364 treesize of output 332 [2021-11-20 23:58:16,129 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:58:16,141 INFO L354 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2021-11-20 23:58:16,141 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 59 treesize of output 45 [2021-11-20 23:58:16,323 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:58:16,323 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:58:16,350 INFO L354 Elim1Store]: treesize reduction 38, result has 49.3 percent of original size [2021-11-20 23:58:16,351 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 84 treesize of output 71 [2021-11-20 23:58:16,519 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:58:16,520 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:58:16,547 INFO L354 Elim1Store]: treesize reduction 38, result has 49.3 percent of original size [2021-11-20 23:58:16,547 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 81 treesize of output 68 [2021-11-20 23:58:17,144 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 36 for LOIs [2021-11-20 23:58:17,584 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:58:18,409 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:58:18,409 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:58:18,409 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [101, 101, 101] total 202 [2021-11-20 23:58:18,410 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1314840442] [2021-11-20 23:58:18,410 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:58:18,411 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 203 states [2021-11-20 23:58:18,411 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:58:18,416 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 203 interpolants. [2021-11-20 23:58:18,421 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20528, Invalid=23782, Unknown=0, NotChecked=0, Total=44310 [2021-11-20 23:58:18,422 INFO L87 Difference]: Start difference. First operand 138 states and 143 transitions. Second operand has 203 states, 203 states have (on average 1.0394088669950738) internal successors, (211), 202 states have internal predecessors, (211), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:58:19,063 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:58:19,063 INFO L93 Difference]: Finished difference Result 276 states and 386 transitions. [2021-11-20 23:58:19,064 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 202 states. [2021-11-20 23:58:19,064 INFO L78 Accepts]: Start accepts. Automaton has has 203 states, 203 states have (on average 1.0394088669950738) internal successors, (211), 202 states have internal predecessors, (211), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 130 [2021-11-20 23:58:19,065 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:58:19,066 INFO L225 Difference]: With dead ends: 276 [2021-11-20 23:58:19,067 INFO L226 Difference]: Without dead ends: 239 [2021-11-20 23:58:19,069 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 489 GetRequests, 280 SyntacticMatches, 0 SemanticMatches, 209 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2802 ImplicationChecksByTransitivity, 14.1s TimeCoverageRelationStatistics Valid=20528, Invalid=23782, Unknown=0, NotChecked=0, Total=44310 [2021-11-20 23:58:19,070 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 0 mSDsluCounter, 114 mSDsCounter, 0 mSdLazyCounter, 245 mSolverCounterSat, 104 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 98 SdHoareTripleChecker+Invalid, 349 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 104 IncrementalHoareTripleChecker+Valid, 245 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-20 23:58:19,070 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 98 Invalid, 349 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [104 Valid, 245 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-20 23:58:19,071 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 239 states. [2021-11-20 23:58:19,084 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 239 to 239. [2021-11-20 23:58:19,085 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 239 states, 235 states have (on average 1.0212765957446808) internal successors, (240), 235 states have internal predecessors, (240), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-20 23:58:19,088 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 239 states to 239 states and 244 transitions. [2021-11-20 23:58:19,088 INFO L78 Accepts]: Start accepts. Automaton has 239 states and 244 transitions. Word has length 130 [2021-11-20 23:58:19,089 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:58:19,089 INFO L470 AbstractCegarLoop]: Abstraction has 239 states and 244 transitions. [2021-11-20 23:58:19,089 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 203 states, 203 states have (on average 1.0394088669950738) internal successors, (211), 202 states have internal predecessors, (211), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:58:19,090 INFO L276 IsEmpty]: Start isEmpty. Operand 239 states and 244 transitions. [2021-11-20 23:58:19,092 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 232 [2021-11-20 23:58:19,092 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:58:19,093 INFO L514 BasicCegarLoop]: trace histogram [200, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:58:19,118 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21c6c84-752b-41d7-b6ad-3739bf9fae1a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-20 23:58:19,297 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21c6c84-752b-41d7-b6ad-3739bf9fae1a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-11-20 23:58:19,297 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:58:19,297 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:58:19,298 INFO L85 PathProgramCache]: Analyzing trace with hash -113899976, now seen corresponding path program 10 times [2021-11-20 23:58:19,298 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:58:19,298 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1437618781] [2021-11-20 23:58:19,298 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:58:19,298 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:58:19,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:58:34,057 INFO L134 CoverageAnalysis]: Checked inductivity of 20353 backedges. 0 proven. 20100 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2021-11-20 23:58:34,057 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:58:34,057 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1437618781] [2021-11-20 23:58:34,057 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1437618781] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:58:34,057 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1965437976] [2021-11-20 23:58:34,057 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:58:34,058 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:58:34,058 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21c6c84-752b-41d7-b6ad-3739bf9fae1a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:58:34,058 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21c6c84-752b-41d7-b6ad-3739bf9fae1a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:58:34,059 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21c6c84-752b-41d7-b6ad-3739bf9fae1a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-20 23:58:34,358 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:58:34,370 INFO L263 TraceCheckSpWp]: Trace formula consists of 1776 conjuncts, 202 conjunts are in the unsatisfiable core [2021-11-20 23:58:34,375 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:58:34,937 INFO L134 CoverageAnalysis]: Checked inductivity of 20353 backedges. 0 proven. 20100 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2021-11-20 23:58:34,937 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:59:18,297 INFO L134 CoverageAnalysis]: Checked inductivity of 20353 backedges. 0 proven. 20100 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2021-11-20 23:59:18,297 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1965437976] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:59:18,297 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1363411949] [2021-11-20 23:59:18,299 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:59:18,299 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:59:18,299 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:59:18,300 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:59:18,300 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:59:18,338 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:59:18,340 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:59:18,341 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:59:18,342 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:59:18,343 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:59:18,392 INFO L354 Elim1Store]: treesize reduction 129, result has 17.8 percent of original size [2021-11-20 23:59:18,392 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 9 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 11 case distinctions, treesize of input 55 treesize of output 73 [2021-11-20 23:59:18,437 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:59:18,438 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:59:18,439 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:59:18,440 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 11 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 32 [2021-11-20 23:59:18,525 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:59:18,526 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:59:18,527 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 7 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 73 treesize of output 61 [2021-11-20 23:59:18,683 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:59:18,684 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:59:18,687 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:59:18,688 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:59:18,689 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:59:18,690 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:59:18,691 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:59:18,693 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:59:18,694 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:59:18,728 INFO L354 Elim1Store]: treesize reduction 142, result has 12.3 percent of original size [2021-11-20 23:59:18,729 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 7 case distinctions, treesize of input 364 treesize of output 332 [2021-11-20 23:59:19,210 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:59:19,222 INFO L354 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2021-11-20 23:59:19,223 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 59 treesize of output 45 [2021-11-20 23:59:19,374 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:59:19,375 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:59:19,405 INFO L354 Elim1Store]: treesize reduction 38, result has 49.3 percent of original size [2021-11-20 23:59:19,405 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 84 treesize of output 71 [2021-11-20 23:59:19,662 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:59:19,663 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:59:19,701 INFO L354 Elim1Store]: treesize reduction 38, result has 49.3 percent of original size [2021-11-20 23:59:19,701 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 81 treesize of output 68 [2021-11-20 23:59:20,288 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 36 for LOIs [2021-11-20 23:59:20,708 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:59:22,088 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:59:22,089 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:59:22,089 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [202, 202, 202] total 404 [2021-11-20 23:59:22,089 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1583753800] [2021-11-20 23:59:22,089 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:59:22,090 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 405 states [2021-11-20 23:59:22,090 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:59:22,100 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 405 interpolants. [2021-11-20 23:59:22,108 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=81835, Invalid=88321, Unknown=0, NotChecked=0, Total=170156 [2021-11-20 23:59:22,109 INFO L87 Difference]: Start difference. First operand 239 states and 244 transitions. Second operand has 405 states, 405 states have (on average 1.019753086419753) internal successors, (413), 404 states have internal predecessors, (413), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:59:24,540 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:59:24,540 INFO L93 Difference]: Finished difference Result 478 states and 689 transitions. [2021-11-20 23:59:24,541 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 404 states. [2021-11-20 23:59:24,542 INFO L78 Accepts]: Start accepts. Automaton has has 405 states, 405 states have (on average 1.019753086419753) internal successors, (413), 404 states have internal predecessors, (413), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 231 [2021-11-20 23:59:24,542 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:59:24,545 INFO L225 Difference]: With dead ends: 478 [2021-11-20 23:59:24,545 INFO L226 Difference]: Without dead ends: 441 [2021-11-20 23:59:24,558 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 893 GetRequests, 482 SyntacticMatches, 0 SemanticMatches, 411 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5630 ImplicationChecksByTransitivity, 57.9s TimeCoverageRelationStatistics Valid=81835, Invalid=88321, Unknown=0, NotChecked=0, Total=170156 [2021-11-20 23:59:24,559 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 0 mSDsluCounter, 152 mSDsCounter, 0 mSdLazyCounter, 458 mSolverCounterSat, 212 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 126 SdHoareTripleChecker+Invalid, 670 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 212 IncrementalHoareTripleChecker+Valid, 458 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-20 23:59:24,559 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 126 Invalid, 670 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [212 Valid, 458 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-20 23:59:24,560 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 441 states. [2021-11-20 23:59:24,579 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 441 to 441. [2021-11-20 23:59:24,579 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 441 states, 437 states have (on average 1.011441647597254) internal successors, (442), 437 states have internal predecessors, (442), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-20 23:59:24,581 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 441 states to 441 states and 446 transitions. [2021-11-20 23:59:24,582 INFO L78 Accepts]: Start accepts. Automaton has 441 states and 446 transitions. Word has length 231 [2021-11-20 23:59:24,582 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:59:24,582 INFO L470 AbstractCegarLoop]: Abstraction has 441 states and 446 transitions. [2021-11-20 23:59:24,583 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 405 states, 405 states have (on average 1.019753086419753) internal successors, (413), 404 states have internal predecessors, (413), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:59:24,584 INFO L276 IsEmpty]: Start isEmpty. Operand 441 states and 446 transitions. [2021-11-20 23:59:24,592 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 434 [2021-11-20 23:59:24,592 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:59:24,593 INFO L514 BasicCegarLoop]: trace histogram [402, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:59:24,637 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21c6c84-752b-41d7-b6ad-3739bf9fae1a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Ended with exit code 0 [2021-11-20 23:59:24,809 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21c6c84-752b-41d7-b6ad-3739bf9fae1a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-11-20 23:59:24,809 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:59:24,809 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:59:24,810 INFO L85 PathProgramCache]: Analyzing trace with hash -1510019208, now seen corresponding path program 11 times [2021-11-20 23:59:24,810 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:59:24,810 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [145206844] [2021-11-20 23:59:24,810 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:59:24,810 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:59:26,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:00:26,957 INFO L134 CoverageAnalysis]: Checked inductivity of 81256 backedges. 0 proven. 81003 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2021-11-21 00:00:26,957 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:00:26,958 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [145206844] [2021-11-21 00:00:26,958 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [145206844] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:00:26,958 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [576270114] [2021-11-21 00:00:26,958 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 00:00:26,959 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:00:26,959 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21c6c84-752b-41d7-b6ad-3739bf9fae1a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:00:26,973 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21c6c84-752b-41d7-b6ad-3739bf9fae1a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:00:26,975 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21c6c84-752b-41d7-b6ad-3739bf9fae1a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-21 00:01:16,310 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2021-11-21 00:01:16,310 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:01:16,354 INFO L263 TraceCheckSpWp]: Trace formula consists of 352 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-21 00:01:16,368 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:01:21,137 INFO L134 CoverageAnalysis]: Checked inductivity of 81256 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 81003 trivial. 0 not checked. [2021-11-21 00:01:21,137 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:01:26,435 INFO L134 CoverageAnalysis]: Checked inductivity of 81256 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 81003 trivial. 0 not checked. [2021-11-21 00:01:26,436 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [576270114] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:01:26,436 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1563211337] [2021-11-21 00:01:26,439 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-21 00:01:26,439 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:01:26,439 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:01:26,440 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:01:26,440 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:01:26,496 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:01:26,497 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:01:26,498 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:01:26,545 INFO L354 Elim1Store]: treesize reduction 83, result has 23.9 percent of original size [2021-11-21 00:01:26,546 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 23 treesize of output 42 [2021-11-21 00:01:26,585 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:01:26,588 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:01:26,589 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:01:26,590 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:01:26,591 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:01:26,662 INFO L354 Elim1Store]: treesize reduction 129, result has 17.8 percent of original size [2021-11-21 00:01:26,662 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 9 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 11 case distinctions, treesize of input 55 treesize of output 73 [2021-11-21 00:01:26,861 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:01:26,862 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:01:26,863 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 6 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 73 treesize of output 61 [2021-11-21 00:01:26,962 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:01:26,963 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:01:26,966 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:01:26,967 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:01:26,968 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:01:26,969 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:01:26,969 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:01:26,972 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:01:26,972 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:01:27,008 INFO L354 Elim1Store]: treesize reduction 142, result has 12.3 percent of original size [2021-11-21 00:01:27,008 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 7 case distinctions, treesize of input 364 treesize of output 332 [2021-11-21 00:01:27,468 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:01:27,480 INFO L354 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2021-11-21 00:01:27,480 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 59 treesize of output 45 [2021-11-21 00:01:27,630 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:01:27,631 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:01:27,661 INFO L354 Elim1Store]: treesize reduction 38, result has 49.3 percent of original size [2021-11-21 00:01:27,662 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 84 treesize of output 71 [2021-11-21 00:01:27,906 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:01:27,907 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:01:27,939 INFO L354 Elim1Store]: treesize reduction 38, result has 49.3 percent of original size [2021-11-21 00:01:27,939 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 81 treesize of output 68 [2021-11-21 00:01:28,597 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 36 for LOIs [2021-11-21 00:01:29,066 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:01:31,938 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:01:31,938 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:01:31,939 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [404, 24, 24] total 450 [2021-11-21 00:01:31,939 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1690812767] [2021-11-21 00:01:31,939 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:01:31,940 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 451 states [2021-11-21 00:01:31,941 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:01:31,951 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 451 interpolants. [2021-11-21 00:01:31,962 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=83008, Invalid=127214, Unknown=0, NotChecked=0, Total=210222 [2021-11-21 00:01:31,963 INFO L87 Difference]: Start difference. First operand 441 states and 446 transitions. Second operand has 451 states, 451 states have (on average 1.0266075388026608) internal successors, (463), 450 states have internal predecessors, (463), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:02:54,173 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:02:54,173 INFO L93 Difference]: Finished difference Result 503 states and 537 transitions. [2021-11-21 00:02:54,174 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 451 states. [2021-11-21 00:02:54,174 INFO L78 Accepts]: Start accepts. Automaton has has 451 states, 451 states have (on average 1.0266075388026608) internal successors, (463), 450 states have internal predecessors, (463), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 433 [2021-11-21 00:02:54,175 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:02:54,177 INFO L225 Difference]: With dead ends: 503 [2021-11-21 00:02:54,178 INFO L226 Difference]: Without dead ends: 466 [2021-11-21 00:02:54,223 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2104 GetRequests, 1244 SyntacticMatches, 0 SemanticMatches, 860 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 104894 ImplicationChecksByTransitivity, 141.1s TimeCoverageRelationStatistics Valid=264761, Invalid=477421, Unknown=0, NotChecked=0, Total=742182 [2021-11-21 00:02:54,223 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 12 mSDsluCounter, 300 mSDsCounter, 0 mSdLazyCounter, 547 mSolverCounterSat, 2454 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 252 SdHoareTripleChecker+Invalid, 3001 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2454 IncrementalHoareTripleChecker+Valid, 547 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.7s IncrementalHoareTripleChecker+Time [2021-11-21 00:02:54,224 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 252 Invalid, 3001 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2454 Valid, 547 Invalid, 0 Unknown, 0 Unchecked, 1.7s Time] [2021-11-21 00:02:54,225 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 466 states. [2021-11-21 00:02:54,250 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 466 to 466. [2021-11-21 00:02:54,251 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 466 states, 462 states have (on average 1.0108225108225108) internal successors, (467), 462 states have internal predecessors, (467), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-21 00:02:54,256 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 466 states to 466 states and 471 transitions. [2021-11-21 00:02:54,256 INFO L78 Accepts]: Start accepts. Automaton has 466 states and 471 transitions. Word has length 433 [2021-11-21 00:02:54,257 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:02:54,258 INFO L470 AbstractCegarLoop]: Abstraction has 466 states and 471 transitions. [2021-11-21 00:02:54,259 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 451 states, 451 states have (on average 1.0266075388026608) internal successors, (463), 450 states have internal predecessors, (463), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:02:54,259 INFO L276 IsEmpty]: Start isEmpty. Operand 466 states and 471 transitions. [2021-11-21 00:02:54,271 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 459 [2021-11-21 00:02:54,272 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:02:54,272 INFO L514 BasicCegarLoop]: trace histogram [403, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:02:54,330 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21c6c84-752b-41d7-b6ad-3739bf9fae1a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Ended with exit code 0 [2021-11-21 00:02:54,497 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21c6c84-752b-41d7-b6ad-3739bf9fae1a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:02:54,497 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:02:54,497 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:02:54,498 INFO L85 PathProgramCache]: Analyzing trace with hash 497319930, now seen corresponding path program 12 times [2021-11-21 00:02:54,498 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:02:54,498 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1630489726] [2021-11-21 00:02:54,498 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:02:54,498 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:02:56,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:04:00,258 INFO L134 CoverageAnalysis]: Checked inductivity of 82487 backedges. 0 proven. 81406 refuted. 0 times theorem prover too weak. 1081 trivial. 0 not checked. [2021-11-21 00:04:00,259 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:04:00,259 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1630489726] [2021-11-21 00:04:00,259 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1630489726] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:04:00,260 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [986672210] [2021-11-21 00:04:00,260 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 00:04:00,260 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:04:00,261 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21c6c84-752b-41d7-b6ad-3739bf9fae1a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:04:00,276 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21c6c84-752b-41d7-b6ad-3739bf9fae1a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:04:00,277 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21c6c84-752b-41d7-b6ad-3739bf9fae1a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-21 00:04:00,958 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 00:04:00,958 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:04:00,993 INFO L263 TraceCheckSpWp]: Trace formula consists of 3520 conjuncts, 405 conjunts are in the unsatisfiable core [2021-11-21 00:04:01,015 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:04:02,242 INFO L134 CoverageAnalysis]: Checked inductivity of 82487 backedges. 0 proven. 81406 refuted. 0 times theorem prover too weak. 1081 trivial. 0 not checked. [2021-11-21 00:04:02,243 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:07:16,270 INFO L134 CoverageAnalysis]: Checked inductivity of 82487 backedges. 0 proven. 81406 refuted. 0 times theorem prover too weak. 1081 trivial. 0 not checked. [2021-11-21 00:07:16,270 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [986672210] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:07:16,271 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1703724830] [2021-11-21 00:07:16,273 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-21 00:07:16,273 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:07:16,273 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:07:16,274 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:07:16,274 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:07:16,302 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:07:16,303 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:07:16,304 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:07:16,348 INFO L354 Elim1Store]: treesize reduction 83, result has 23.9 percent of original size [2021-11-21 00:07:16,348 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 6 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 23 treesize of output 42 [2021-11-21 00:07:16,414 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:07:16,415 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:07:16,418 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:07:16,419 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:07:16,420 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:07:16,421 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:07:16,477 INFO L354 Elim1Store]: treesize reduction 129, result has 17.8 percent of original size [2021-11-21 00:07:16,477 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 9 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 11 case distinctions, treesize of input 55 treesize of output 73 [2021-11-21 00:07:16,624 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:07:16,626 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:07:16,627 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 6 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 58 treesize of output 51 [2021-11-21 00:07:16,802 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:07:16,803 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:07:16,806 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:07:16,807 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:07:16,808 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:07:16,900 INFO L354 Elim1Store]: treesize reduction 250, result has 15.5 percent of original size [2021-11-21 00:07:16,901 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 9 case distinctions, treesize of input 344 treesize of output 334 [2021-11-21 00:07:18,260 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:07:18,274 INFO L354 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2021-11-21 00:07:18,274 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 59 treesize of output 45 [2021-11-21 00:07:18,476 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:07:18,477 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:07:18,508 INFO L354 Elim1Store]: treesize reduction 38, result has 49.3 percent of original size [2021-11-21 00:07:18,508 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 84 treesize of output 71 [2021-11-21 00:07:18,757 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:07:18,758 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:07:18,791 INFO L354 Elim1Store]: treesize reduction 38, result has 49.3 percent of original size [2021-11-21 00:07:18,791 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 81 treesize of output 68 [2021-11-21 00:07:19,449 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 36 for LOIs [2021-11-21 00:07:20,057 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:07:23,082 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:07:23,082 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:07:23,083 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [405, 405, 405] total 810 [2021-11-21 00:07:23,083 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2104414924] [2021-11-21 00:07:23,083 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:07:23,086 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 811 states [2021-11-21 00:07:23,086 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:07:23,134 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 811 interpolants. [2021-11-21 00:07:23,173 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=328480, Invalid=341462, Unknown=0, NotChecked=0, Total=669942 [2021-11-21 00:07:23,175 INFO L87 Difference]: Start difference. First operand 466 states and 471 transitions. Second operand has 811 states, 811 states have (on average 1.0098643649815042) internal successors, (819), 810 states have internal predecessors, (819), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:07:42,492 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:07:42,493 INFO L93 Difference]: Finished difference Result 932 states and 1346 transitions. [2021-11-21 00:07:42,493 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 810 states. [2021-11-21 00:07:42,494 INFO L78 Accepts]: Start accepts. Automaton has has 811 states, 811 states have (on average 1.0098643649815042) internal successors, (819), 810 states have internal predecessors, (819), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 458 [2021-11-21 00:07:42,496 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:07:42,502 INFO L225 Difference]: With dead ends: 932 [2021-11-21 00:07:42,502 INFO L226 Difference]: Without dead ends: 871 [2021-11-21 00:07:42,550 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1777 GetRequests, 960 SyntacticMatches, 0 SemanticMatches, 817 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11314 ImplicationChecksByTransitivity, 258.8s TimeCoverageRelationStatistics Valid=328480, Invalid=341462, Unknown=0, NotChecked=0, Total=669942 [2021-11-21 00:07:42,551 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 0 mSDsluCounter, 95 mSDsCounter, 0 mSdLazyCounter, 847 mSolverCounterSat, 411 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 84 SdHoareTripleChecker+Invalid, 1258 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 411 IncrementalHoareTripleChecker+Valid, 847 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:07:42,552 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 84 Invalid, 1258 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [411 Valid, 847 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2021-11-21 00:07:42,554 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 871 states. [2021-11-21 00:07:42,595 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 871 to 871. [2021-11-21 00:07:42,597 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 871 states, 867 states have (on average 1.0057670126874279) internal successors, (872), 867 states have internal predecessors, (872), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-21 00:07:42,603 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 871 states to 871 states and 876 transitions. [2021-11-21 00:07:42,603 INFO L78 Accepts]: Start accepts. Automaton has 871 states and 876 transitions. Word has length 458 [2021-11-21 00:07:42,604 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:07:42,604 INFO L470 AbstractCegarLoop]: Abstraction has 871 states and 876 transitions. [2021-11-21 00:07:42,606 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 811 states, 811 states have (on average 1.0098643649815042) internal successors, (819), 810 states have internal predecessors, (819), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:07:42,606 INFO L276 IsEmpty]: Start isEmpty. Operand 871 states and 876 transitions. [2021-11-21 00:07:42,617 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 864 [2021-11-21 00:07:42,617 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:07:42,618 INFO L514 BasicCegarLoop]: trace histogram [808, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:07:42,663 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21c6c84-752b-41d7-b6ad-3739bf9fae1a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-21 00:07:42,833 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21c6c84-752b-41d7-b6ad-3739bf9fae1a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:07:42,833 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:07:42,833 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:07:42,834 INFO L85 PathProgramCache]: Analyzing trace with hash 2003805624, now seen corresponding path program 13 times [2021-11-21 00:07:42,834 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:07:42,834 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [817054981] [2021-11-21 00:07:42,834 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:07:42,834 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:07:47,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat