./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/reducercommutativity/max10-1.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_7cc0077c-e1c5-4a79-82bb-19ce954eaad8/bin/utaipan-TEXQjIfE4P/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7cc0077c-e1c5-4a79-82bb-19ce954eaad8/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_7cc0077c-e1c5-4a79-82bb-19ce954eaad8/bin/utaipan-TEXQjIfE4P/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7cc0077c-e1c5-4a79-82bb-19ce954eaad8/bin/utaipan-TEXQjIfE4P/config/TaipanReach.xml -i ../../sv-benchmarks/c/reducercommutativity/max10-1.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7cc0077c-e1c5-4a79-82bb-19ce954eaad8/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_7cc0077c-e1c5-4a79-82bb-19ce954eaad8/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 1223a7fef027dae15fda123c8ce40ec49dc779b7d5d627ded9a670697417439e --- Real Ultimate output --- This is Ultimate 0.2.1-dev-53f42b1 [2021-11-21 01:47:42,048 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-21 01:47:42,050 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-21 01:47:42,122 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-21 01:47:42,123 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-21 01:47:42,125 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-21 01:47:42,127 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-21 01:47:42,130 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-21 01:47:42,133 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-21 01:47:42,134 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-21 01:47:42,136 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-21 01:47:42,138 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-21 01:47:42,138 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-21 01:47:42,140 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-21 01:47:42,142 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-21 01:47:42,144 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-21 01:47:42,145 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-21 01:47:42,146 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-21 01:47:42,149 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-21 01:47:42,152 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-21 01:47:42,155 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-21 01:47:42,156 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-21 01:47:42,158 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-21 01:47:42,160 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-21 01:47:42,165 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-21 01:47:42,166 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-21 01:47:42,166 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-21 01:47:42,168 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-21 01:47:42,168 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-21 01:47:42,170 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-21 01:47:42,171 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-21 01:47:42,172 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-21 01:47:42,173 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-21 01:47:42,174 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-21 01:47:42,176 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-21 01:47:42,176 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-21 01:47:42,177 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-21 01:47:42,178 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-21 01:47:42,178 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-21 01:47:42,180 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-21 01:47:42,181 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-21 01:47:42,182 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7cc0077c-e1c5-4a79-82bb-19ce954eaad8/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-21 01:47:42,218 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-21 01:47:42,218 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-21 01:47:42,219 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-21 01:47:42,219 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-21 01:47:42,220 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-21 01:47:42,221 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-21 01:47:42,221 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-21 01:47:42,222 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-21 01:47:42,222 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-21 01:47:42,223 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-21 01:47:42,223 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-21 01:47:42,223 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-21 01:47:42,224 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-21 01:47:42,224 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-21 01:47:42,225 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-21 01:47:42,225 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-21 01:47:42,226 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-21 01:47:42,226 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-21 01:47:42,227 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-21 01:47:42,228 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-21 01:47:42,228 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-21 01:47:42,228 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-21 01:47:42,229 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-21 01:47:42,229 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-21 01:47:42,229 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-21 01:47:42,230 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-21 01:47:42,230 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-21 01:47:42,230 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-21 01:47:42,231 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-21 01:47:42,231 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-21 01:47:42,231 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-21 01:47:42,231 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-21 01:47:42,232 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 01:47:42,232 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-21 01:47:42,233 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-21 01:47:42,233 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-21 01:47:42,233 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-21 01:47:42,234 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-21 01:47:42,234 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-21 01:47:42,234 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-21 01:47:42,235 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-21 01:47:42,235 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_7cc0077c-e1c5-4a79-82bb-19ce954eaad8/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7cc0077c-e1c5-4a79-82bb-19ce954eaad8/bin/utaipan-TEXQjIfE4P Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 1223a7fef027dae15fda123c8ce40ec49dc779b7d5d627ded9a670697417439e [2021-11-21 01:47:42,581 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-21 01:47:42,605 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-21 01:47:42,608 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-21 01:47:42,609 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-21 01:47:42,610 INFO L275 PluginConnector]: CDTParser initialized [2021-11-21 01:47:42,611 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7cc0077c-e1c5-4a79-82bb-19ce954eaad8/bin/utaipan-TEXQjIfE4P/../../sv-benchmarks/c/reducercommutativity/max10-1.i [2021-11-21 01:47:42,687 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7cc0077c-e1c5-4a79-82bb-19ce954eaad8/bin/utaipan-TEXQjIfE4P/data/fb82b33a3/d95137f369204dc79c39b15660a4709e/FLAG15bf59734 [2021-11-21 01:47:43,202 INFO L306 CDTParser]: Found 1 translation units. [2021-11-21 01:47:43,202 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7cc0077c-e1c5-4a79-82bb-19ce954eaad8/sv-benchmarks/c/reducercommutativity/max10-1.i [2021-11-21 01:47:43,209 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7cc0077c-e1c5-4a79-82bb-19ce954eaad8/bin/utaipan-TEXQjIfE4P/data/fb82b33a3/d95137f369204dc79c39b15660a4709e/FLAG15bf59734 [2021-11-21 01:47:43,573 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7cc0077c-e1c5-4a79-82bb-19ce954eaad8/bin/utaipan-TEXQjIfE4P/data/fb82b33a3/d95137f369204dc79c39b15660a4709e [2021-11-21 01:47:43,576 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-21 01:47:43,584 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-21 01:47:43,590 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-21 01:47:43,591 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-21 01:47:43,594 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-21 01:47:43,595 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 01:47:43" (1/1) ... [2021-11-21 01:47:43,597 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3585dd01 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:47:43, skipping insertion in model container [2021-11-21 01:47:43,597 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 01:47:43" (1/1) ... [2021-11-21 01:47:43,605 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-21 01:47:43,624 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-21 01:47:43,867 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_7cc0077c-e1c5-4a79-82bb-19ce954eaad8/sv-benchmarks/c/reducercommutativity/max10-1.i[1290,1303] [2021-11-21 01:47:43,884 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 01:47:43,898 INFO L203 MainTranslator]: Completed pre-run [2021-11-21 01:47:43,943 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_7cc0077c-e1c5-4a79-82bb-19ce954eaad8/sv-benchmarks/c/reducercommutativity/max10-1.i[1290,1303] [2021-11-21 01:47:43,954 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 01:47:43,973 INFO L208 MainTranslator]: Completed translation [2021-11-21 01:47:43,974 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:47:43 WrapperNode [2021-11-21 01:47:43,974 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-21 01:47:43,976 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-21 01:47:43,976 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-21 01:47:43,976 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-21 01:47:43,986 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:47:43" (1/1) ... [2021-11-21 01:47:44,007 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:47:43" (1/1) ... [2021-11-21 01:47:44,039 INFO L137 Inliner]: procedures = 16, calls = 23, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 67 [2021-11-21 01:47:44,040 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-21 01:47:44,041 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-21 01:47:44,042 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-21 01:47:44,042 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-21 01:47:44,052 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:47:43" (1/1) ... [2021-11-21 01:47:44,053 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:47:43" (1/1) ... [2021-11-21 01:47:44,060 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:47:43" (1/1) ... [2021-11-21 01:47:44,060 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:47:43" (1/1) ... [2021-11-21 01:47:44,081 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:47:43" (1/1) ... [2021-11-21 01:47:44,086 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:47:43" (1/1) ... [2021-11-21 01:47:44,087 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:47:43" (1/1) ... [2021-11-21 01:47:44,090 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-21 01:47:44,091 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-21 01:47:44,092 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-21 01:47:44,092 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-21 01:47:44,093 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:47:43" (1/1) ... [2021-11-21 01:47:44,102 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 01:47:44,120 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7cc0077c-e1c5-4a79-82bb-19ce954eaad8/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:47:44,133 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7cc0077c-e1c5-4a79-82bb-19ce954eaad8/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-21 01:47:44,150 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7cc0077c-e1c5-4a79-82bb-19ce954eaad8/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-21 01:47:44,199 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-21 01:47:44,199 INFO L130 BoogieDeclarations]: Found specification of procedure max [2021-11-21 01:47:44,199 INFO L138 BoogieDeclarations]: Found implementation of procedure max [2021-11-21 01:47:44,199 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-21 01:47:44,200 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-21 01:47:44,200 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-21 01:47:44,200 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-21 01:47:44,200 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-21 01:47:44,200 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-21 01:47:44,201 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-21 01:47:44,269 INFO L236 CfgBuilder]: Building ICFG [2021-11-21 01:47:44,270 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-21 01:47:44,439 INFO L277 CfgBuilder]: Performing block encoding [2021-11-21 01:47:44,484 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-21 01:47:44,484 INFO L301 CfgBuilder]: Removed 3 assume(true) statements. [2021-11-21 01:47:44,487 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 01:47:44 BoogieIcfgContainer [2021-11-21 01:47:44,487 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-21 01:47:44,490 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-21 01:47:44,490 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-21 01:47:44,498 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-21 01:47:44,498 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.11 01:47:43" (1/3) ... [2021-11-21 01:47:44,500 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@497a23be and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 01:47:44, skipping insertion in model container [2021-11-21 01:47:44,500 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:47:43" (2/3) ... [2021-11-21 01:47:44,501 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@497a23be and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 01:47:44, skipping insertion in model container [2021-11-21 01:47:44,501 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 01:47:44" (3/3) ... [2021-11-21 01:47:44,503 INFO L111 eAbstractionObserver]: Analyzing ICFG max10-1.i [2021-11-21 01:47:44,510 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-21 01:47:44,511 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-21 01:47:44,576 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-21 01:47:44,584 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 [2021-11-21 01:47:44,584 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-21 01:47:44,631 INFO L276 IsEmpty]: Start isEmpty. Operand has 17 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 12 states have internal predecessors, (16), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-21 01:47:44,637 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-21 01:47:44,638 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:47:44,638 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:47:44,639 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:47:44,645 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:47:44,645 INFO L85 PathProgramCache]: Analyzing trace with hash 1438378950, now seen corresponding path program 1 times [2021-11-21 01:47:44,655 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:47:44,655 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1597223037] [2021-11-21 01:47:44,656 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:47:44,657 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:47:44,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:47:44,854 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-21 01:47:44,854 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:47:44,855 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1597223037] [2021-11-21 01:47:44,856 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1597223037] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:47:44,856 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:47:44,856 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-21 01:47:44,858 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1204590870] [2021-11-21 01:47:44,859 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:47:44,863 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 01:47:44,864 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:47:44,916 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 01:47:44,917 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 01:47:44,920 INFO L87 Difference]: Start difference. First operand has 17 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 12 states have internal predecessors, (16), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 states have internal predecessors, (10), 1 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-21 01:47:44,985 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:47:44,985 INFO L93 Difference]: Finished difference Result 33 states and 43 transitions. [2021-11-21 01:47:44,986 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 01:47:44,988 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 states have internal predecessors, (10), 1 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 20 [2021-11-21 01:47:44,988 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:47:44,996 INFO L225 Difference]: With dead ends: 33 [2021-11-21 01:47:44,996 INFO L226 Difference]: Without dead ends: 16 [2021-11-21 01:47:44,999 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 01:47:45,020 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 0 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 15 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 26 SdHoareTripleChecker+Invalid, 15 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 15 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 01:47:45,022 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 26 Invalid, 15 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 15 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 01:47:45,053 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2021-11-21 01:47:45,079 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2021-11-21 01:47:45,081 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 11 states have internal predecessors, (14), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-21 01:47:45,082 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 20 transitions. [2021-11-21 01:47:45,084 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 20 transitions. Word has length 20 [2021-11-21 01:47:45,084 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:47:45,085 INFO L470 AbstractCegarLoop]: Abstraction has 16 states and 20 transitions. [2021-11-21 01:47:45,085 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 states have internal predecessors, (10), 1 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-21 01:47:45,085 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 20 transitions. [2021-11-21 01:47:45,087 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-11-21 01:47:45,087 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:47:45,088 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:47:45,088 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-21 01:47:45,089 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:47:45,090 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:47:45,091 INFO L85 PathProgramCache]: Analyzing trace with hash -1900472846, now seen corresponding path program 1 times [2021-11-21 01:47:45,091 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:47:45,093 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1789615627] [2021-11-21 01:47:45,094 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:47:45,095 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:47:45,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:47:45,243 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-21 01:47:45,243 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:47:45,244 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1789615627] [2021-11-21 01:47:45,244 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1789615627] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:47:45,244 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [25847981] [2021-11-21 01:47:45,245 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:47:45,245 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:47:45,245 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7cc0077c-e1c5-4a79-82bb-19ce954eaad8/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:47:45,248 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7cc0077c-e1c5-4a79-82bb-19ce954eaad8/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:47:45,274 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7cc0077c-e1c5-4a79-82bb-19ce954eaad8/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-21 01:47:45,379 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:47:45,381 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-21 01:47:45,388 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:47:45,535 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-21 01:47:45,535 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 01:47:45,536 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [25847981] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:47:45,536 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 01:47:45,536 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4] total 5 [2021-11-21 01:47:45,537 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [255849364] [2021-11-21 01:47:45,537 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:47:45,538 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 01:47:45,539 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:47:45,539 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 01:47:45,539 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-21 01:47:45,540 INFO L87 Difference]: Start difference. First operand 16 states and 20 transitions. Second operand has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 3 states have internal predecessors, (13), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-21 01:47:45,574 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:47:45,574 INFO L93 Difference]: Finished difference Result 29 states and 39 transitions. [2021-11-21 01:47:45,575 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 01:47:45,593 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 3 states have internal predecessors, (13), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) Word has length 21 [2021-11-21 01:47:45,594 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:47:45,594 INFO L225 Difference]: With dead ends: 29 [2021-11-21 01:47:45,594 INFO L226 Difference]: Without dead ends: 17 [2021-11-21 01:47:45,595 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-21 01:47:45,597 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 14 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 14 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 01:47:45,598 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 23 Invalid, 14 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 14 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 01:47:45,600 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2021-11-21 01:47:45,603 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2021-11-21 01:47:45,604 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 12 states have (on average 1.25) internal successors, (15), 12 states have internal predecessors, (15), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-21 01:47:45,605 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 21 transitions. [2021-11-21 01:47:45,605 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 21 transitions. Word has length 21 [2021-11-21 01:47:45,605 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:47:45,605 INFO L470 AbstractCegarLoop]: Abstraction has 17 states and 21 transitions. [2021-11-21 01:47:45,614 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 3 states have internal predecessors, (13), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-21 01:47:45,614 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 21 transitions. [2021-11-21 01:47:45,615 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-11-21 01:47:45,615 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:47:45,615 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:47:45,658 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7cc0077c-e1c5-4a79-82bb-19ce954eaad8/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-21 01:47:45,831 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7cc0077c-e1c5-4a79-82bb-19ce954eaad8/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:47:45,831 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:47:45,832 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:47:45,832 INFO L85 PathProgramCache]: Analyzing trace with hash -1710545452, now seen corresponding path program 1 times [2021-11-21 01:47:45,833 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:47:45,833 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2037022158] [2021-11-21 01:47:45,833 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:47:45,833 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:47:45,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:47:45,897 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-21 01:47:45,897 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:47:45,897 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2037022158] [2021-11-21 01:47:45,898 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2037022158] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:47:45,898 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1472440152] [2021-11-21 01:47:45,898 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:47:45,898 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:47:45,898 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7cc0077c-e1c5-4a79-82bb-19ce954eaad8/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:47:45,899 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7cc0077c-e1c5-4a79-82bb-19ce954eaad8/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:47:45,926 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7cc0077c-e1c5-4a79-82bb-19ce954eaad8/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-21 01:47:45,981 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:47:45,983 INFO L263 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-21 01:47:45,985 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:47:46,093 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-21 01:47:46,093 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 01:47:46,094 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1472440152] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:47:46,094 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 01:47:46,094 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4] total 5 [2021-11-21 01:47:46,095 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [224930040] [2021-11-21 01:47:46,095 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:47:46,095 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 01:47:46,096 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:47:46,096 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 01:47:46,096 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-21 01:47:46,097 INFO L87 Difference]: Start difference. First operand 17 states and 21 transitions. Second operand has 3 states, 3 states have (on average 5.0) internal successors, (15), 3 states have internal predecessors, (15), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-21 01:47:46,123 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:47:46,123 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2021-11-21 01:47:46,123 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 01:47:46,123 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 5.0) internal successors, (15), 3 states have internal predecessors, (15), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 24 [2021-11-21 01:47:46,124 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:47:46,124 INFO L225 Difference]: With dead ends: 27 [2021-11-21 01:47:46,125 INFO L226 Difference]: Without dead ends: 18 [2021-11-21 01:47:46,125 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-21 01:47:46,127 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 14 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 14 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 01:47:46,128 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 23 Invalid, 14 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 14 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 01:47:46,129 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2021-11-21 01:47:46,133 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2021-11-21 01:47:46,133 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 13 states have internal predecessors, (16), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-21 01:47:46,134 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 22 transitions. [2021-11-21 01:47:46,134 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 22 transitions. Word has length 24 [2021-11-21 01:47:46,135 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:47:46,136 INFO L470 AbstractCegarLoop]: Abstraction has 18 states and 22 transitions. [2021-11-21 01:47:46,136 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 5.0) internal successors, (15), 3 states have internal predecessors, (15), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-21 01:47:46,136 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 22 transitions. [2021-11-21 01:47:46,137 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-11-21 01:47:46,137 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:47:46,137 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:47:46,180 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7cc0077c-e1c5-4a79-82bb-19ce954eaad8/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-21 01:47:46,358 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7cc0077c-e1c5-4a79-82bb-19ce954eaad8/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:47:46,358 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:47:46,359 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:47:46,359 INFO L85 PathProgramCache]: Analyzing trace with hash -1965911522, now seen corresponding path program 1 times [2021-11-21 01:47:46,359 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:47:46,360 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1626165364] [2021-11-21 01:47:46,360 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:47:46,360 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:47:46,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:47:46,451 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-21 01:47:46,452 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:47:46,452 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1626165364] [2021-11-21 01:47:46,453 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1626165364] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:47:46,455 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [920107201] [2021-11-21 01:47:46,455 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:47:46,456 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:47:46,456 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7cc0077c-e1c5-4a79-82bb-19ce954eaad8/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:47:46,462 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7cc0077c-e1c5-4a79-82bb-19ce954eaad8/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:47:46,468 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7cc0077c-e1c5-4a79-82bb-19ce954eaad8/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-21 01:47:46,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:47:46,528 INFO L263 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-21 01:47:46,531 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:47:46,651 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-21 01:47:46,651 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:47:46,796 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-21 01:47:46,796 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [920107201] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:47:46,797 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [319224747] [2021-11-21 01:47:46,830 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-21 01:47:46,830 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:47:46,836 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:47:46,842 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:47:46,843 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:47:46,971 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:47:46,996 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-21 01:47:46,997 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 26 [2021-11-21 01:47:47,024 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:47:47,026 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:47:47,049 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-21 01:47:47,050 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-21 01:47:47,132 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:47:47,134 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 36 [2021-11-21 01:47:47,288 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:47:47,289 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:47:47,321 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-21 01:47:47,322 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 186 treesize of output 185 [2021-11-21 01:47:47,781 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 01:47:48,255 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:47:48,260 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 20 [2021-11-21 01:47:48,674 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:47:48,679 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 20 [2021-11-21 01:47:48,771 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:47:48,773 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:47:48,774 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:47:48,805 INFO L354 Elim1Store]: treesize reduction 65, result has 27.0 percent of original size [2021-11-21 01:47:48,813 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 54 treesize of output 62 [2021-11-21 01:47:48,940 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:47:48,941 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 24 [2021-11-21 01:47:49,010 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-21 01:47:49,635 INFO L197 IcfgInterpreter]: Interpreting procedure max with input of size 15 for LOIs [2021-11-21 01:47:49,831 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:47:50,681 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:47:50,681 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:47:50,681 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 3, 4] total 7 [2021-11-21 01:47:50,681 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [140329441] [2021-11-21 01:47:50,682 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:47:50,682 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-21 01:47:50,683 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:47:50,683 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-21 01:47:50,684 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=305, Unknown=0, NotChecked=0, Total=380 [2021-11-21 01:47:50,685 INFO L87 Difference]: Start difference. First operand 18 states and 22 transitions. Second operand has 7 states, 7 states have (on average 3.0) internal successors, (21), 7 states have internal predecessors, (21), 1 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2021-11-21 01:47:50,736 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:47:50,736 INFO L93 Difference]: Finished difference Result 36 states and 46 transitions. [2021-11-21 01:47:50,738 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-21 01:47:50,738 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.0) internal successors, (21), 7 states have internal predecessors, (21), 1 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) Word has length 25 [2021-11-21 01:47:50,738 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:47:50,739 INFO L225 Difference]: With dead ends: 36 [2021-11-21 01:47:50,739 INFO L226 Difference]: Without dead ends: 21 [2021-11-21 01:47:50,741 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 59 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 115 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=75, Invalid=305, Unknown=0, NotChecked=0, Total=380 [2021-11-21 01:47:50,742 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 21 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 25 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 21 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 01:47:50,743 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 36 Invalid, 25 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 21 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 01:47:50,743 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-11-21 01:47:50,746 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2021-11-21 01:47:50,746 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 16 states have (on average 1.1875) internal successors, (19), 16 states have internal predecessors, (19), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-21 01:47:50,747 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2021-11-21 01:47:50,747 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 25 [2021-11-21 01:47:50,748 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:47:50,748 INFO L470 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2021-11-21 01:47:50,748 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 3.0) internal successors, (21), 7 states have internal predecessors, (21), 1 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2021-11-21 01:47:50,748 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2021-11-21 01:47:50,749 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-11-21 01:47:50,749 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:47:50,750 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:47:50,779 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7cc0077c-e1c5-4a79-82bb-19ce954eaad8/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-21 01:47:50,966 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7cc0077c-e1c5-4a79-82bb-19ce954eaad8/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3 [2021-11-21 01:47:50,966 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:47:50,966 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:47:50,967 INFO L85 PathProgramCache]: Analyzing trace with hash -275773198, now seen corresponding path program 2 times [2021-11-21 01:47:50,967 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:47:50,967 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1731476129] [2021-11-21 01:47:50,967 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:47:50,967 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:47:50,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:47:51,031 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-21 01:47:51,031 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:47:51,031 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1731476129] [2021-11-21 01:47:51,032 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1731476129] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:47:51,032 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2009740382] [2021-11-21 01:47:51,032 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:47:51,032 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:47:51,032 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7cc0077c-e1c5-4a79-82bb-19ce954eaad8/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:47:51,033 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7cc0077c-e1c5-4a79-82bb-19ce954eaad8/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:47:51,054 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7cc0077c-e1c5-4a79-82bb-19ce954eaad8/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-21 01:47:51,096 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-21 01:47:51,096 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:47:51,097 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-21 01:47:51,100 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:47:51,177 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 10 proven. 1 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-21 01:47:51,177 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:47:51,266 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 10 proven. 1 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-21 01:47:51,267 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2009740382] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:47:51,267 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [52549190] [2021-11-21 01:47:51,270 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-21 01:47:51,270 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:47:51,271 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:47:51,271 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:47:51,271 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:47:51,295 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:47:51,297 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:47:51,314 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-21 01:47:51,315 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-21 01:47:51,353 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:47:51,354 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2021-11-21 01:47:51,413 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:47:51,414 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 41 [2021-11-21 01:47:51,515 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:47:51,518 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:47:51,520 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:47:51,534 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-21 01:47:51,535 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 196 treesize of output 184 [2021-11-21 01:47:51,721 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 01:47:52,017 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:47:52,018 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 20 [2021-11-21 01:47:52,353 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:47:52,354 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:47:52,355 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:47:52,356 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 27 [2021-11-21 01:47:52,441 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:47:52,443 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:47:52,444 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:47:52,445 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:47:52,459 INFO L354 Elim1Store]: treesize reduction 57, result has 5.0 percent of original size [2021-11-21 01:47:52,460 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 3 case distinctions, treesize of input 62 treesize of output 54 [2021-11-21 01:47:52,520 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:47:52,521 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 24 [2021-11-21 01:47:52,566 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-21 01:47:53,149 INFO L197 IcfgInterpreter]: Interpreting procedure max with input of size 15 for LOIs [2021-11-21 01:47:53,329 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:47:53,860 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:47:53,861 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:47:53,861 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2021-11-21 01:47:53,861 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1050741384] [2021-11-21 01:47:53,861 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:47:53,862 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-21 01:47:53,862 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:47:53,862 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-21 01:47:53,863 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=308, Unknown=0, NotChecked=0, Total=380 [2021-11-21 01:47:53,863 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand has 7 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 7 states have internal predecessors, (25), 2 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2021-11-21 01:47:53,905 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:47:53,906 INFO L93 Difference]: Finished difference Result 38 states and 50 transitions. [2021-11-21 01:47:53,906 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-21 01:47:53,906 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 7 states have internal predecessors, (25), 2 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) Word has length 28 [2021-11-21 01:47:53,907 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:47:53,907 INFO L225 Difference]: With dead ends: 38 [2021-11-21 01:47:53,907 INFO L226 Difference]: Without dead ends: 24 [2021-11-21 01:47:53,908 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 68 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 117 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=72, Invalid=308, Unknown=0, NotChecked=0, Total=380 [2021-11-21 01:47:53,909 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 24 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 28 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 24 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 01:47:53,910 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 34 Invalid, 28 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 24 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 01:47:53,911 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2021-11-21 01:47:53,915 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2021-11-21 01:47:53,915 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 19 states have (on average 1.1578947368421053) internal successors, (22), 19 states have internal predecessors, (22), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-21 01:47:53,916 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 28 transitions. [2021-11-21 01:47:53,916 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 28 transitions. Word has length 28 [2021-11-21 01:47:53,917 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:47:53,917 INFO L470 AbstractCegarLoop]: Abstraction has 24 states and 28 transitions. [2021-11-21 01:47:53,917 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 7 states have internal predecessors, (25), 2 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2021-11-21 01:47:53,917 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 28 transitions. [2021-11-21 01:47:53,919 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-11-21 01:47:53,919 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:47:53,919 INFO L514 BasicCegarLoop]: trace histogram [12, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:47:53,956 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7cc0077c-e1c5-4a79-82bb-19ce954eaad8/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-21 01:47:54,134 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7cc0077c-e1c5-4a79-82bb-19ce954eaad8/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:47:54,134 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:47:54,134 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:47:54,134 INFO L85 PathProgramCache]: Analyzing trace with hash 1700893048, now seen corresponding path program 3 times [2021-11-21 01:47:54,135 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:47:54,135 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [158364884] [2021-11-21 01:47:54,135 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:47:54,135 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:47:54,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:47:54,242 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2021-11-21 01:47:54,242 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:47:54,243 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [158364884] [2021-11-21 01:47:54,243 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [158364884] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:47:54,243 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [537950090] [2021-11-21 01:47:54,243 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:47:54,243 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:47:54,244 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7cc0077c-e1c5-4a79-82bb-19ce954eaad8/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:47:54,250 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7cc0077c-e1c5-4a79-82bb-19ce954eaad8/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:47:54,294 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7cc0077c-e1c5-4a79-82bb-19ce954eaad8/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-21 01:47:54,359 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:47:54,360 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:47:54,361 INFO L263 TraceCheckSpWp]: Trace formula consists of 188 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-21 01:47:54,364 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:47:54,467 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 52 proven. 10 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2021-11-21 01:47:54,467 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:47:54,601 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 0 proven. 62 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2021-11-21 01:47:54,601 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [537950090] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:47:54,602 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [727089304] [2021-11-21 01:47:54,605 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-21 01:47:54,605 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:47:54,605 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:47:54,606 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:47:54,606 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:47:54,624 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:47:54,625 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:47:54,640 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-21 01:47:54,641 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-21 01:47:54,658 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:47:54,661 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2021-11-21 01:47:54,713 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:47:54,714 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 41 [2021-11-21 01:47:54,798 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:47:54,801 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:47:54,803 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:47:54,818 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-21 01:47:54,819 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 196 treesize of output 184 [2021-11-21 01:47:55,013 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 01:47:55,354 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:47:55,356 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 20 [2021-11-21 01:47:55,667 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:47:55,668 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:47:55,668 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:47:55,669 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 27 [2021-11-21 01:47:55,729 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:47:55,731 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:47:55,732 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:47:55,734 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:47:55,750 INFO L354 Elim1Store]: treesize reduction 57, result has 5.0 percent of original size [2021-11-21 01:47:55,751 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 3 case distinctions, treesize of input 62 treesize of output 54 [2021-11-21 01:47:55,839 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:47:55,840 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 24 [2021-11-21 01:47:55,898 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-21 01:47:56,442 INFO L197 IcfgInterpreter]: Interpreting procedure max with input of size 15 for LOIs [2021-11-21 01:47:56,810 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:47:57,377 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:47:57,377 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:47:57,378 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 7, 7] total 14 [2021-11-21 01:47:57,378 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1135659185] [2021-11-21 01:47:57,378 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:47:57,378 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-21 01:47:57,379 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:47:57,379 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-21 01:47:57,380 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=580, Unknown=0, NotChecked=0, Total=702 [2021-11-21 01:47:57,380 INFO L87 Difference]: Start difference. First operand 24 states and 28 transitions. Second operand has 14 states, 14 states have (on average 2.2857142857142856) internal successors, (32), 14 states have internal predecessors, (32), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-21 01:47:57,444 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:47:57,444 INFO L93 Difference]: Finished difference Result 48 states and 64 transitions. [2021-11-21 01:47:57,445 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-21 01:47:57,445 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.2857142857142856) internal successors, (32), 14 states have internal predecessors, (32), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 37 [2021-11-21 01:47:57,446 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:47:57,446 INFO L225 Difference]: With dead ends: 48 [2021-11-21 01:47:57,446 INFO L226 Difference]: Without dead ends: 31 [2021-11-21 01:47:57,447 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 88 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 227 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=122, Invalid=580, Unknown=0, NotChecked=0, Total=702 [2021-11-21 01:47:57,448 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 58 mSDsCounter, 0 mSdLazyCounter, 43 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 53 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 43 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:47:57,449 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 56 Invalid, 53 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 43 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:47:57,450 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2021-11-21 01:47:57,454 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2021-11-21 01:47:57,455 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 26 states have (on average 1.1153846153846154) internal successors, (29), 26 states have internal predecessors, (29), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-21 01:47:57,456 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 35 transitions. [2021-11-21 01:47:57,456 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 35 transitions. Word has length 37 [2021-11-21 01:47:57,456 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:47:57,456 INFO L470 AbstractCegarLoop]: Abstraction has 31 states and 35 transitions. [2021-11-21 01:47:57,457 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.2857142857142856) internal successors, (32), 14 states have internal predecessors, (32), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-21 01:47:57,457 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 35 transitions. [2021-11-21 01:47:57,459 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-11-21 01:47:57,459 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:47:57,459 INFO L514 BasicCegarLoop]: trace histogram [30, 4, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:47:57,501 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7cc0077c-e1c5-4a79-82bb-19ce954eaad8/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-21 01:47:57,674 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7cc0077c-e1c5-4a79-82bb-19ce954eaad8/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:47:57,675 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:47:57,675 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:47:57,675 INFO L85 PathProgramCache]: Analyzing trace with hash 240654022, now seen corresponding path program 4 times [2021-11-21 01:47:57,675 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:47:57,675 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1796164787] [2021-11-21 01:47:57,675 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:47:57,676 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:47:57,783 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:47:57,904 INFO L134 CoverageAnalysis]: Checked inductivity of 547 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 537 trivial. 0 not checked. [2021-11-21 01:47:57,905 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:47:57,905 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1796164787] [2021-11-21 01:47:57,905 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1796164787] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:47:57,905 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1474982363] [2021-11-21 01:47:57,905 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 01:47:57,906 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:47:57,906 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7cc0077c-e1c5-4a79-82bb-19ce954eaad8/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:47:57,910 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7cc0077c-e1c5-4a79-82bb-19ce954eaad8/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:47:57,938 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7cc0077c-e1c5-4a79-82bb-19ce954eaad8/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-21 01:47:58,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:47:58,019 INFO L263 TraceCheckSpWp]: Trace formula consists of 264 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-21 01:47:58,024 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:47:58,131 INFO L134 CoverageAnalysis]: Checked inductivity of 547 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 537 trivial. 0 not checked. [2021-11-21 01:47:58,132 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:47:58,269 INFO L134 CoverageAnalysis]: Checked inductivity of 547 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 537 trivial. 0 not checked. [2021-11-21 01:47:58,269 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1474982363] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:47:58,270 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [382902798] [2021-11-21 01:47:58,273 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-21 01:47:58,273 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:47:58,273 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:47:58,274 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:47:58,274 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:47:58,295 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:47:58,306 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-21 01:47:58,307 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 26 [2021-11-21 01:47:58,329 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:47:58,330 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:47:58,344 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-21 01:47:58,345 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-21 01:47:58,395 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:47:58,396 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 41 [2021-11-21 01:47:58,506 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:47:58,508 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:47:58,511 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:47:58,526 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-21 01:47:58,527 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 196 treesize of output 184 [2021-11-21 01:47:58,725 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 01:47:59,041 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:47:59,044 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 20 [2021-11-21 01:47:59,355 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:47:59,356 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:47:59,357 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:47:59,358 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 27 [2021-11-21 01:47:59,408 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:47:59,410 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:47:59,411 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:47:59,412 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:47:59,429 INFO L354 Elim1Store]: treesize reduction 57, result has 5.0 percent of original size [2021-11-21 01:47:59,430 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 3 case distinctions, treesize of input 62 treesize of output 54 [2021-11-21 01:47:59,502 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:47:59,504 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 24 [2021-11-21 01:47:59,553 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-21 01:48:00,085 INFO L197 IcfgInterpreter]: Interpreting procedure max with input of size 15 for LOIs [2021-11-21 01:48:00,436 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:48:00,969 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:48:00,969 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:48:00,969 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6, 7] total 13 [2021-11-21 01:48:00,970 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1357356488] [2021-11-21 01:48:00,970 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:48:00,970 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-21 01:48:00,970 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:48:00,971 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-21 01:48:00,971 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=130, Invalid=520, Unknown=0, NotChecked=0, Total=650 [2021-11-21 01:48:00,972 INFO L87 Difference]: Start difference. First operand 31 states and 35 transitions. Second operand has 13 states, 13 states have (on average 2.076923076923077) internal successors, (27), 13 states have internal predecessors, (27), 1 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2021-11-21 01:48:01,021 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:48:01,021 INFO L93 Difference]: Finished difference Result 62 states and 75 transitions. [2021-11-21 01:48:01,022 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-21 01:48:01,023 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.076923076923077) internal successors, (27), 13 states have internal predecessors, (27), 1 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) Word has length 56 [2021-11-21 01:48:01,023 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:48:01,024 INFO L225 Difference]: With dead ends: 62 [2021-11-21 01:48:01,024 INFO L226 Difference]: Without dead ends: 37 [2021-11-21 01:48:01,025 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 173 GetRequests, 149 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 250 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=130, Invalid=520, Unknown=0, NotChecked=0, Total=650 [2021-11-21 01:48:01,027 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 96 mSDsCounter, 0 mSdLazyCounter, 47 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 84 SdHoareTripleChecker+Invalid, 53 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 47 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 01:48:01,027 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 84 Invalid, 53 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 47 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 01:48:01,028 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2021-11-21 01:48:01,033 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2021-11-21 01:48:01,033 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 32 states have (on average 1.09375) internal successors, (35), 32 states have internal predecessors, (35), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-21 01:48:01,035 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 41 transitions. [2021-11-21 01:48:01,035 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 41 transitions. Word has length 56 [2021-11-21 01:48:01,035 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:48:01,035 INFO L470 AbstractCegarLoop]: Abstraction has 37 states and 41 transitions. [2021-11-21 01:48:01,036 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 2.076923076923077) internal successors, (27), 13 states have internal predecessors, (27), 1 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2021-11-21 01:48:01,036 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 41 transitions. [2021-11-21 01:48:01,038 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-11-21 01:48:01,038 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:48:01,038 INFO L514 BasicCegarLoop]: trace histogram [30, 10, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:48:01,074 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7cc0077c-e1c5-4a79-82bb-19ce954eaad8/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-21 01:48:01,250 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7cc0077c-e1c5-4a79-82bb-19ce954eaad8/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:48:01,250 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:48:01,250 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:48:01,251 INFO L85 PathProgramCache]: Analyzing trace with hash 1623164742, now seen corresponding path program 5 times [2021-11-21 01:48:01,251 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:48:01,251 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1362986908] [2021-11-21 01:48:01,251 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:48:01,251 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:48:01,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:48:01,381 INFO L134 CoverageAnalysis]: Checked inductivity of 592 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 589 trivial. 0 not checked. [2021-11-21 01:48:01,381 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:48:01,381 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1362986908] [2021-11-21 01:48:01,382 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1362986908] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:48:01,382 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [564242574] [2021-11-21 01:48:01,382 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:48:01,382 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:48:01,382 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7cc0077c-e1c5-4a79-82bb-19ce954eaad8/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:48:01,386 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7cc0077c-e1c5-4a79-82bb-19ce954eaad8/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:48:01,410 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7cc0077c-e1c5-4a79-82bb-19ce954eaad8/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-21 01:48:01,485 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-21 01:48:01,485 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:48:01,487 INFO L263 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-21 01:48:01,491 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:48:01,625 INFO L134 CoverageAnalysis]: Checked inductivity of 592 backedges. 246 proven. 3 refuted. 0 times theorem prover too weak. 343 trivial. 0 not checked. [2021-11-21 01:48:01,625 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:48:01,753 INFO L134 CoverageAnalysis]: Checked inductivity of 592 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 589 trivial. 0 not checked. [2021-11-21 01:48:01,753 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [564242574] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:48:01,753 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1079306712] [2021-11-21 01:48:01,756 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-21 01:48:01,756 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:48:01,756 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:48:01,756 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:48:01,757 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:48:01,809 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:48:01,823 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-21 01:48:01,823 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 26 [2021-11-21 01:48:01,841 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:48:01,842 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:48:01,859 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-21 01:48:01,860 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-21 01:48:01,924 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:48:01,925 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 36 [2021-11-21 01:48:02,006 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:48:02,007 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:48:02,036 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-21 01:48:02,037 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 186 treesize of output 185 [2021-11-21 01:48:02,345 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 01:48:02,656 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:48:02,657 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 20 [2021-11-21 01:48:02,942 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:48:02,943 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 20 [2021-11-21 01:48:03,006 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:48:03,007 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:48:03,008 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:48:03,038 INFO L354 Elim1Store]: treesize reduction 65, result has 27.0 percent of original size [2021-11-21 01:48:03,039 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 54 treesize of output 62 [2021-11-21 01:48:03,203 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:48:03,205 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 24 [2021-11-21 01:48:03,247 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-21 01:48:03,695 INFO L197 IcfgInterpreter]: Interpreting procedure max with input of size 15 for LOIs [2021-11-21 01:48:03,858 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:48:04,271 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:48:04,272 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:48:04,272 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 9 [2021-11-21 01:48:04,272 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [535437222] [2021-11-21 01:48:04,272 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:48:04,273 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-21 01:48:04,273 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:48:04,273 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-21 01:48:04,274 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=375, Unknown=0, NotChecked=0, Total=462 [2021-11-21 01:48:04,274 INFO L87 Difference]: Start difference. First operand 37 states and 41 transitions. Second operand has 9 states, 9 states have (on average 2.5555555555555554) internal successors, (23), 9 states have internal predecessors, (23), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-11-21 01:48:04,307 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:48:04,307 INFO L93 Difference]: Finished difference Result 59 states and 67 transitions. [2021-11-21 01:48:04,308 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-21 01:48:04,308 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.5555555555555554) internal successors, (23), 9 states have internal predecessors, (23), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 62 [2021-11-21 01:48:04,308 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:48:04,309 INFO L225 Difference]: With dead ends: 59 [2021-11-21 01:48:04,309 INFO L226 Difference]: Without dead ends: 41 [2021-11-21 01:48:04,310 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 189 GetRequests, 169 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 160 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=87, Invalid=375, Unknown=0, NotChecked=0, Total=462 [2021-11-21 01:48:04,311 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 20 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 25 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 20 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 01:48:04,311 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 23 Invalid, 25 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 20 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 01:48:04,312 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2021-11-21 01:48:04,317 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2021-11-21 01:48:04,318 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 36 states have (on average 1.0833333333333333) internal successors, (39), 36 states have internal predecessors, (39), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-21 01:48:04,319 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 45 transitions. [2021-11-21 01:48:04,320 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 45 transitions. Word has length 62 [2021-11-21 01:48:04,320 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:48:04,320 INFO L470 AbstractCegarLoop]: Abstraction has 41 states and 45 transitions. [2021-11-21 01:48:04,321 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.5555555555555554) internal successors, (23), 9 states have internal predecessors, (23), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-11-21 01:48:04,321 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 45 transitions. [2021-11-21 01:48:04,323 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-11-21 01:48:04,324 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:48:04,324 INFO L514 BasicCegarLoop]: trace histogram [30, 10, 6, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:48:04,374 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7cc0077c-e1c5-4a79-82bb-19ce954eaad8/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-21 01:48:04,547 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7cc0077c-e1c5-4a79-82bb-19ce954eaad8/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2021-11-21 01:48:04,547 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:48:04,547 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:48:04,547 INFO L85 PathProgramCache]: Analyzing trace with hash 145204166, now seen corresponding path program 6 times [2021-11-21 01:48:04,548 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:48:04,548 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1900992306] [2021-11-21 01:48:04,548 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:48:04,548 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:48:04,604 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:48:04,703 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 589 trivial. 0 not checked. [2021-11-21 01:48:04,704 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:48:04,704 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1900992306] [2021-11-21 01:48:04,704 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1900992306] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:48:04,704 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1975983771] [2021-11-21 01:48:04,704 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:48:04,705 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:48:04,705 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7cc0077c-e1c5-4a79-82bb-19ce954eaad8/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:48:04,706 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7cc0077c-e1c5-4a79-82bb-19ce954eaad8/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:48:04,726 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7cc0077c-e1c5-4a79-82bb-19ce954eaad8/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-21 01:48:04,860 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:48:04,860 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:48:04,862 INFO L263 TraceCheckSpWp]: Trace formula consists of 316 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-21 01:48:04,865 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:48:05,018 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 246 proven. 21 refuted. 0 times theorem prover too weak. 343 trivial. 0 not checked. [2021-11-21 01:48:05,018 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:48:05,208 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 589 trivial. 0 not checked. [2021-11-21 01:48:05,208 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1975983771] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:48:05,208 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1528235681] [2021-11-21 01:48:05,213 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-21 01:48:05,213 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:48:05,213 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:48:05,214 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:48:05,214 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:48:05,236 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:48:05,237 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:48:05,251 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-21 01:48:05,252 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-21 01:48:05,269 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:48:05,270 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2021-11-21 01:48:05,327 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:48:05,328 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 36 [2021-11-21 01:48:05,393 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:48:05,394 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:48:05,422 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-21 01:48:05,423 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 186 treesize of output 185 [2021-11-21 01:48:05,735 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 01:48:05,948 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:48:05,950 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 20 [2021-11-21 01:48:06,254 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:48:06,255 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:48:06,255 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:48:06,256 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 27 [2021-11-21 01:48:06,334 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:48:06,335 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:48:06,336 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:48:06,339 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:48:06,351 INFO L354 Elim1Store]: treesize reduction 57, result has 5.0 percent of original size [2021-11-21 01:48:06,352 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 3 case distinctions, treesize of input 62 treesize of output 54 [2021-11-21 01:48:06,416 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:48:06,416 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 24 [2021-11-21 01:48:06,477 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-21 01:48:06,929 INFO L197 IcfgInterpreter]: Interpreting procedure max with input of size 15 for LOIs [2021-11-21 01:48:07,250 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:48:07,830 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:48:07,830 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:48:07,830 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 12 [2021-11-21 01:48:07,830 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1439697586] [2021-11-21 01:48:07,830 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:48:07,831 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-21 01:48:07,831 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:48:07,832 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-21 01:48:07,832 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=483, Unknown=0, NotChecked=0, Total=600 [2021-11-21 01:48:07,832 INFO L87 Difference]: Start difference. First operand 41 states and 45 transitions. Second operand has 12 states, 12 states have (on average 2.25) internal successors, (27), 12 states have internal predecessors, (27), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-11-21 01:48:07,866 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:48:07,866 INFO L93 Difference]: Finished difference Result 62 states and 69 transitions. [2021-11-21 01:48:07,866 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-21 01:48:07,867 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.25) internal successors, (27), 12 states have internal predecessors, (27), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 66 [2021-11-21 01:48:07,867 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:48:07,868 INFO L225 Difference]: With dead ends: 62 [2021-11-21 01:48:07,868 INFO L226 Difference]: Without dead ends: 44 [2021-11-21 01:48:07,869 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 205 GetRequests, 181 SyntacticMatches, 1 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 196 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=117, Invalid=483, Unknown=0, NotChecked=0, Total=600 [2021-11-21 01:48:07,870 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 29 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 31 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 29 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 01:48:07,870 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 34 Invalid, 31 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 29 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 01:48:07,871 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2021-11-21 01:48:07,877 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2021-11-21 01:48:07,877 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 39 states have (on average 1.0769230769230769) internal successors, (42), 39 states have internal predecessors, (42), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-21 01:48:07,878 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 48 transitions. [2021-11-21 01:48:07,879 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 48 transitions. Word has length 66 [2021-11-21 01:48:07,879 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:48:07,879 INFO L470 AbstractCegarLoop]: Abstraction has 44 states and 48 transitions. [2021-11-21 01:48:07,880 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 2.25) internal successors, (27), 12 states have internal predecessors, (27), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-11-21 01:48:07,880 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 48 transitions. [2021-11-21 01:48:07,882 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-11-21 01:48:07,883 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:48:07,883 INFO L514 BasicCegarLoop]: trace histogram [30, 10, 9, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:48:07,927 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7cc0077c-e1c5-4a79-82bb-19ce954eaad8/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-21 01:48:08,106 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7cc0077c-e1c5-4a79-82bb-19ce954eaad8/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:48:08,106 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:48:08,106 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:48:08,106 INFO L85 PathProgramCache]: Analyzing trace with hash 1016143672, now seen corresponding path program 7 times [2021-11-21 01:48:08,106 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:48:08,107 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [126761846] [2021-11-21 01:48:08,107 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:48:08,107 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:48:32,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat