./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/seq-mthreaded-reduced/pals_opt-floodmax.3.4.ufo.BOUNDED-6.pals.c.v+cfa-reducer.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 839c364b Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_be12730d-dc33-4766-b171-b2d9f2e5ca30/bin/utaipan-eEHZpOm5b7/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_be12730d-dc33-4766-b171-b2d9f2e5ca30/bin/utaipan-eEHZpOm5b7/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_be12730d-dc33-4766-b171-b2d9f2e5ca30/bin/utaipan-eEHZpOm5b7/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_be12730d-dc33-4766-b171-b2d9f2e5ca30/bin/utaipan-eEHZpOm5b7/config/TaipanReach.xml -i ../../sv-benchmarks/c/seq-mthreaded-reduced/pals_opt-floodmax.3.4.ufo.BOUNDED-6.pals.c.v+cfa-reducer.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_be12730d-dc33-4766-b171-b2d9f2e5ca30/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_be12730d-dc33-4766-b171-b2d9f2e5ca30/bin/utaipan-eEHZpOm5b7 --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 6fd1b86eb4bd4da10127873e4ddea09cb0ce3be9adebe9545b8e8b0c5a6a02d7 --- Real Ultimate output --- This is Ultimate 0.2.2-hotfix-svcomp22-839c364 [2021-11-25 20:17:17,998 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-25 20:17:18,000 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-25 20:17:18,056 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-25 20:17:18,057 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-25 20:17:18,061 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-25 20:17:18,063 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-25 20:17:18,067 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-25 20:17:18,070 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-25 20:17:18,075 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-25 20:17:18,076 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-25 20:17:18,078 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-25 20:17:18,079 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-25 20:17:18,082 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-25 20:17:18,084 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-25 20:17:18,093 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-25 20:17:18,095 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-25 20:17:18,096 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-25 20:17:18,099 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-25 20:17:18,108 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-25 20:17:18,110 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-25 20:17:18,112 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-25 20:17:18,115 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-25 20:17:18,116 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-25 20:17:18,125 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-25 20:17:18,126 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-25 20:17:18,126 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-25 20:17:18,128 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-25 20:17:18,129 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-25 20:17:18,131 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-25 20:17:18,131 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-25 20:17:18,132 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-25 20:17:18,134 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-25 20:17:18,135 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-25 20:17:18,137 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-25 20:17:18,137 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-25 20:17:18,138 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-25 20:17:18,138 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-25 20:17:18,138 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-25 20:17:18,139 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-25 20:17:18,140 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-25 20:17:18,141 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_be12730d-dc33-4766-b171-b2d9f2e5ca30/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-25 20:17:18,189 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-25 20:17:18,190 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-25 20:17:18,190 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-25 20:17:18,191 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-25 20:17:18,198 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-25 20:17:18,198 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-25 20:17:18,198 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-25 20:17:18,198 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-25 20:17:18,199 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-25 20:17:18,199 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-25 20:17:18,200 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-25 20:17:18,200 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-25 20:17:18,200 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-25 20:17:18,201 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-25 20:17:18,201 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-25 20:17:18,201 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-25 20:17:18,201 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-25 20:17:18,202 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-25 20:17:18,202 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-25 20:17:18,203 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-25 20:17:18,203 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-25 20:17:18,203 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-25 20:17:18,203 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-25 20:17:18,204 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-25 20:17:18,204 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-25 20:17:18,204 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-25 20:17:18,206 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-25 20:17:18,206 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-25 20:17:18,206 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-25 20:17:18,206 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-25 20:17:18,207 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-25 20:17:18,207 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-25 20:17:18,207 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 20:17:18,208 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-25 20:17:18,208 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-25 20:17:18,208 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-25 20:17:18,208 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-25 20:17:18,209 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-25 20:17:18,209 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-25 20:17:18,209 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-25 20:17:18,209 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-25 20:17:18,209 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_be12730d-dc33-4766-b171-b2d9f2e5ca30/bin/utaipan-eEHZpOm5b7/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_be12730d-dc33-4766-b171-b2d9f2e5ca30/bin/utaipan-eEHZpOm5b7 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 6fd1b86eb4bd4da10127873e4ddea09cb0ce3be9adebe9545b8e8b0c5a6a02d7 [2021-11-25 20:17:18,475 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-25 20:17:18,496 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-25 20:17:18,498 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-25 20:17:18,499 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-25 20:17:18,500 INFO L275 PluginConnector]: CDTParser initialized [2021-11-25 20:17:18,502 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_be12730d-dc33-4766-b171-b2d9f2e5ca30/bin/utaipan-eEHZpOm5b7/../../sv-benchmarks/c/seq-mthreaded-reduced/pals_opt-floodmax.3.4.ufo.BOUNDED-6.pals.c.v+cfa-reducer.c [2021-11-25 20:17:18,558 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_be12730d-dc33-4766-b171-b2d9f2e5ca30/bin/utaipan-eEHZpOm5b7/data/ec4a8e057/e038618edf86488d80d7d48644910540/FLAG8fb6808cb [2021-11-25 20:17:19,135 INFO L306 CDTParser]: Found 1 translation units. [2021-11-25 20:17:19,136 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_be12730d-dc33-4766-b171-b2d9f2e5ca30/sv-benchmarks/c/seq-mthreaded-reduced/pals_opt-floodmax.3.4.ufo.BOUNDED-6.pals.c.v+cfa-reducer.c [2021-11-25 20:17:19,148 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_be12730d-dc33-4766-b171-b2d9f2e5ca30/bin/utaipan-eEHZpOm5b7/data/ec4a8e057/e038618edf86488d80d7d48644910540/FLAG8fb6808cb [2021-11-25 20:17:19,460 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_be12730d-dc33-4766-b171-b2d9f2e5ca30/bin/utaipan-eEHZpOm5b7/data/ec4a8e057/e038618edf86488d80d7d48644910540 [2021-11-25 20:17:19,462 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-25 20:17:19,464 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-25 20:17:19,468 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-25 20:17:19,469 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-25 20:17:19,472 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-25 20:17:19,474 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 08:17:19" (1/1) ... [2021-11-25 20:17:19,475 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5d2edb9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:17:19, skipping insertion in model container [2021-11-25 20:17:19,477 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 08:17:19" (1/1) ... [2021-11-25 20:17:19,484 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-25 20:17:19,534 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-25 20:17:19,768 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_be12730d-dc33-4766-b171-b2d9f2e5ca30/sv-benchmarks/c/seq-mthreaded-reduced/pals_opt-floodmax.3.4.ufo.BOUNDED-6.pals.c.v+cfa-reducer.c[7806,7819] [2021-11-25 20:17:19,804 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 20:17:19,819 INFO L203 MainTranslator]: Completed pre-run [2021-11-25 20:17:19,873 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_be12730d-dc33-4766-b171-b2d9f2e5ca30/sv-benchmarks/c/seq-mthreaded-reduced/pals_opt-floodmax.3.4.ufo.BOUNDED-6.pals.c.v+cfa-reducer.c[7806,7819] [2021-11-25 20:17:19,908 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 20:17:19,928 INFO L208 MainTranslator]: Completed translation [2021-11-25 20:17:19,929 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:17:19 WrapperNode [2021-11-25 20:17:19,929 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-25 20:17:19,930 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-25 20:17:19,930 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-25 20:17:19,930 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-25 20:17:19,938 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:17:19" (1/1) ... [2021-11-25 20:17:19,951 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:17:19" (1/1) ... [2021-11-25 20:17:19,999 INFO L137 Inliner]: procedures = 22, calls = 7, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 633 [2021-11-25 20:17:19,999 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-25 20:17:20,000 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-25 20:17:20,000 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-25 20:17:20,001 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-25 20:17:20,009 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:17:19" (1/1) ... [2021-11-25 20:17:20,010 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:17:19" (1/1) ... [2021-11-25 20:17:20,015 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:17:19" (1/1) ... [2021-11-25 20:17:20,028 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:17:19" (1/1) ... [2021-11-25 20:17:20,040 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:17:19" (1/1) ... [2021-11-25 20:17:20,047 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:17:19" (1/1) ... [2021-11-25 20:17:20,051 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:17:19" (1/1) ... [2021-11-25 20:17:20,056 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-25 20:17:20,057 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-25 20:17:20,057 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-25 20:17:20,057 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-25 20:17:20,058 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:17:19" (1/1) ... [2021-11-25 20:17:20,067 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 20:17:20,094 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_be12730d-dc33-4766-b171-b2d9f2e5ca30/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:17:20,122 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_be12730d-dc33-4766-b171-b2d9f2e5ca30/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-25 20:17:20,130 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_be12730d-dc33-4766-b171-b2d9f2e5ca30/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-25 20:17:20,165 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-25 20:17:20,166 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-25 20:17:20,166 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-25 20:17:20,166 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-25 20:17:20,379 INFO L236 CfgBuilder]: Building ICFG [2021-11-25 20:17:20,380 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-25 20:17:21,054 INFO L277 CfgBuilder]: Performing block encoding [2021-11-25 20:17:21,361 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-25 20:17:21,361 INFO L301 CfgBuilder]: Removed 0 assume(true) statements. [2021-11-25 20:17:21,364 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 08:17:21 BoogieIcfgContainer [2021-11-25 20:17:21,364 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-25 20:17:21,366 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-25 20:17:21,367 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-25 20:17:21,370 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-25 20:17:21,370 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 08:17:19" (1/3) ... [2021-11-25 20:17:21,371 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@25d38917 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 08:17:21, skipping insertion in model container [2021-11-25 20:17:21,371 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:17:19" (2/3) ... [2021-11-25 20:17:21,372 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@25d38917 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 08:17:21, skipping insertion in model container [2021-11-25 20:17:21,372 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 08:17:21" (3/3) ... [2021-11-25 20:17:21,373 INFO L111 eAbstractionObserver]: Analyzing ICFG pals_opt-floodmax.3.4.ufo.BOUNDED-6.pals.c.v+cfa-reducer.c [2021-11-25 20:17:21,379 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-25 20:17:21,379 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-25 20:17:21,428 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-25 20:17:21,435 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 [2021-11-25 20:17:21,435 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-25 20:17:21,452 INFO L276 IsEmpty]: Start isEmpty. Operand has 98 states, 96 states have (on average 1.7708333333333333) internal successors, (170), 97 states have internal predecessors, (170), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:17:21,460 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-11-25 20:17:21,460 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:17:21,461 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:17:21,462 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:17:21,467 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:17:21,467 INFO L85 PathProgramCache]: Analyzing trace with hash 566108884, now seen corresponding path program 1 times [2021-11-25 20:17:21,477 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:17:21,477 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [19884248] [2021-11-25 20:17:21,478 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:17:21,479 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:17:21,698 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:17:21,819 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:17:21,819 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:17:21,819 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [19884248] [2021-11-25 20:17:21,820 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [19884248] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:17:21,820 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:17:21,821 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 20:17:21,822 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1713195249] [2021-11-25 20:17:21,823 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:17:21,827 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 20:17:21,828 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:17:21,855 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 20:17:21,855 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 20:17:21,858 INFO L87 Difference]: Start difference. First operand has 98 states, 96 states have (on average 1.7708333333333333) internal successors, (170), 97 states have internal predecessors, (170), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 14.333333333333334) internal successors, (43), 3 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:17:21,940 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:17:21,941 INFO L93 Difference]: Finished difference Result 216 states and 361 transitions. [2021-11-25 20:17:21,942 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 20:17:21,943 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 14.333333333333334) internal successors, (43), 3 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 43 [2021-11-25 20:17:21,944 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:17:21,955 INFO L225 Difference]: With dead ends: 216 [2021-11-25 20:17:21,955 INFO L226 Difference]: Without dead ends: 146 [2021-11-25 20:17:21,959 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 [2021-11-25 20:17:21,962 INFO L933 BasicCegarLoop]: 237 mSDtfsCounter, 109 mSDsluCounter, 129 mSDsCounter, 0 mSdLazyCounter, 18 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 109 SdHoareTripleChecker+Valid, 362 SdHoareTripleChecker+Invalid, 20 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 18 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 20:17:21,964 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [109 Valid, 362 Invalid, 20 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 18 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 20:17:21,980 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 146 states. [2021-11-25 20:17:22,019 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 146 to 144. [2021-11-25 20:17:22,021 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 144 states, 143 states have (on average 1.5034965034965035) internal successors, (215), 143 states have internal predecessors, (215), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:17:22,023 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 215 transitions. [2021-11-25 20:17:22,025 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 215 transitions. Word has length 43 [2021-11-25 20:17:22,025 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:17:22,025 INFO L470 AbstractCegarLoop]: Abstraction has 144 states and 215 transitions. [2021-11-25 20:17:22,026 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 14.333333333333334) internal successors, (43), 3 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:17:22,026 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 215 transitions. [2021-11-25 20:17:22,028 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-11-25 20:17:22,028 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:17:22,028 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:17:22,028 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-25 20:17:22,029 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:17:22,029 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:17:22,030 INFO L85 PathProgramCache]: Analyzing trace with hash -1914990475, now seen corresponding path program 1 times [2021-11-25 20:17:22,030 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:17:22,030 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [766496903] [2021-11-25 20:17:22,030 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:17:22,030 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:17:22,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:17:22,138 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:17:22,138 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:17:22,139 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [766496903] [2021-11-25 20:17:22,139 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [766496903] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:17:22,139 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:17:22,139 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 20:17:22,139 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1932443711] [2021-11-25 20:17:22,140 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:17:22,141 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 20:17:22,141 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:17:22,142 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 20:17:22,142 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 20:17:22,142 INFO L87 Difference]: Start difference. First operand 144 states and 215 transitions. Second operand has 3 states, 3 states have (on average 15.0) internal successors, (45), 3 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:17:22,221 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:17:22,222 INFO L93 Difference]: Finished difference Result 309 states and 482 transitions. [2021-11-25 20:17:22,223 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 20:17:22,223 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 15.0) internal successors, (45), 3 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 45 [2021-11-25 20:17:22,224 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:17:22,229 INFO L225 Difference]: With dead ends: 309 [2021-11-25 20:17:22,230 INFO L226 Difference]: Without dead ends: 197 [2021-11-25 20:17:22,232 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 [2021-11-25 20:17:22,235 INFO L933 BasicCegarLoop]: 127 mSDtfsCounter, 95 mSDsluCounter, 80 mSDsCounter, 0 mSdLazyCounter, 21 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 95 SdHoareTripleChecker+Valid, 205 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 [2021-11-25 20:17:22,237 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [95 Valid, 205 Invalid, 25 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 21 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 20:17:22,239 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 197 states. [2021-11-25 20:17:22,270 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 197 to 195. [2021-11-25 20:17:22,271 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 195 states, 194 states have (on average 1.5154639175257731) internal successors, (294), 194 states have internal predecessors, (294), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:17:22,272 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 195 states to 195 states and 294 transitions. [2021-11-25 20:17:22,272 INFO L78 Accepts]: Start accepts. Automaton has 195 states and 294 transitions. Word has length 45 [2021-11-25 20:17:22,273 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:17:22,273 INFO L470 AbstractCegarLoop]: Abstraction has 195 states and 294 transitions. [2021-11-25 20:17:22,273 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 15.0) internal successors, (45), 3 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:17:22,274 INFO L276 IsEmpty]: Start isEmpty. Operand 195 states and 294 transitions. [2021-11-25 20:17:22,275 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-11-25 20:17:22,275 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:17:22,276 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:17:22,276 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-25 20:17:22,276 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:17:22,277 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:17:22,277 INFO L85 PathProgramCache]: Analyzing trace with hash -1398553194, now seen corresponding path program 1 times [2021-11-25 20:17:22,277 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:17:22,277 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [19980905] [2021-11-25 20:17:22,277 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:17:22,278 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:17:22,340 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:17:22,394 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:17:22,396 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:17:22,396 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [19980905] [2021-11-25 20:17:22,396 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [19980905] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:17:22,397 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:17:22,398 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 20:17:22,398 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1143822051] [2021-11-25 20:17:22,398 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:17:22,399 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 20:17:22,399 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:17:22,400 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 20:17:22,400 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 20:17:22,401 INFO L87 Difference]: Start difference. First operand 195 states and 294 transitions. Second operand has 3 states, 3 states have (on average 15.666666666666666) internal successors, (47), 3 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:17:22,490 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:17:22,490 INFO L93 Difference]: Finished difference Result 475 states and 745 transitions. [2021-11-25 20:17:22,490 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 20:17:22,491 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 15.666666666666666) internal successors, (47), 3 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 47 [2021-11-25 20:17:22,491 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:17:22,493 INFO L225 Difference]: With dead ends: 475 [2021-11-25 20:17:22,493 INFO L226 Difference]: Without dead ends: 314 [2021-11-25 20:17:22,495 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 [2021-11-25 20:17:22,496 INFO L933 BasicCegarLoop]: 175 mSDtfsCounter, 95 mSDsluCounter, 104 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 95 SdHoareTripleChecker+Valid, 276 SdHoareTripleChecker+Invalid, 16 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 14 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 20:17:22,497 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [95 Valid, 276 Invalid, 16 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 14 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 20:17:22,498 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 314 states. [2021-11-25 20:17:22,522 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 314 to 312. [2021-11-25 20:17:22,523 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 312 states, 311 states have (on average 1.5466237942122187) internal successors, (481), 311 states have internal predecessors, (481), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:17:22,525 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 312 states to 312 states and 481 transitions. [2021-11-25 20:17:22,525 INFO L78 Accepts]: Start accepts. Automaton has 312 states and 481 transitions. Word has length 47 [2021-11-25 20:17:22,525 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:17:22,525 INFO L470 AbstractCegarLoop]: Abstraction has 312 states and 481 transitions. [2021-11-25 20:17:22,526 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 15.666666666666666) internal successors, (47), 3 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:17:22,526 INFO L276 IsEmpty]: Start isEmpty. Operand 312 states and 481 transitions. [2021-11-25 20:17:22,527 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-11-25 20:17:22,527 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:17:22,528 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:17:22,528 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-25 20:17:22,528 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:17:22,529 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:17:22,529 INFO L85 PathProgramCache]: Analyzing trace with hash 1696286242, now seen corresponding path program 1 times [2021-11-25 20:17:22,529 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:17:22,529 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1504413028] [2021-11-25 20:17:22,529 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:17:22,530 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:17:22,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:17:22,602 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:17:22,602 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:17:22,602 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1504413028] [2021-11-25 20:17:22,602 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1504413028] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:17:22,602 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:17:22,602 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 20:17:22,603 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1857441165] [2021-11-25 20:17:22,603 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:17:22,603 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 20:17:22,603 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:17:22,603 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 20:17:22,604 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 20:17:22,604 INFO L87 Difference]: Start difference. First operand 312 states and 481 transitions. Second operand has 3 states, 3 states have (on average 16.333333333333332) internal successors, (49), 3 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:17:22,653 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:17:22,653 INFO L93 Difference]: Finished difference Result 767 states and 1212 transitions. [2021-11-25 20:17:22,654 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 20:17:22,654 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 16.333333333333332) internal successors, (49), 3 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 49 [2021-11-25 20:17:22,655 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:17:22,658 INFO L225 Difference]: With dead ends: 767 [2021-11-25 20:17:22,658 INFO L226 Difference]: Without dead ends: 489 [2021-11-25 20:17:22,659 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 [2021-11-25 20:17:22,660 INFO L933 BasicCegarLoop]: 136 mSDtfsCounter, 94 mSDsluCounter, 108 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 94 SdHoareTripleChecker+Valid, 241 SdHoareTripleChecker+Invalid, 13 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 13 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 20:17:22,661 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [94 Valid, 241 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 20:17:22,662 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 489 states. [2021-11-25 20:17:22,686 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 489 to 487. [2021-11-25 20:17:22,688 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 487 states, 486 states have (on average 1.5658436213991769) internal successors, (761), 486 states have internal predecessors, (761), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:17:22,690 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 487 states to 487 states and 761 transitions. [2021-11-25 20:17:22,690 INFO L78 Accepts]: Start accepts. Automaton has 487 states and 761 transitions. Word has length 49 [2021-11-25 20:17:22,691 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:17:22,691 INFO L470 AbstractCegarLoop]: Abstraction has 487 states and 761 transitions. [2021-11-25 20:17:22,691 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 16.333333333333332) internal successors, (49), 3 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:17:22,691 INFO L276 IsEmpty]: Start isEmpty. Operand 487 states and 761 transitions. [2021-11-25 20:17:22,692 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-11-25 20:17:22,692 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:17:22,693 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:17:22,693 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-25 20:17:22,693 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:17:22,694 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:17:22,694 INFO L85 PathProgramCache]: Analyzing trace with hash -2030005373, now seen corresponding path program 1 times [2021-11-25 20:17:22,694 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:17:22,694 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [572698259] [2021-11-25 20:17:22,694 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:17:22,694 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:17:22,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:17:22,760 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:17:22,760 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:17:22,760 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [572698259] [2021-11-25 20:17:22,761 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [572698259] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:17:22,761 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:17:22,761 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 20:17:22,761 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1032315632] [2021-11-25 20:17:22,761 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:17:22,762 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 20:17:22,762 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:17:22,762 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 20:17:22,763 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 20:17:22,763 INFO L87 Difference]: Start difference. First operand 487 states and 761 transitions. Second operand has 3 states, 3 states have (on average 17.0) internal successors, (51), 3 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:17:22,856 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:17:22,860 INFO L93 Difference]: Finished difference Result 1235 states and 1960 transitions. [2021-11-25 20:17:22,861 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 20:17:22,861 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 17.0) internal successors, (51), 3 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 51 [2021-11-25 20:17:22,862 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:17:22,873 INFO L225 Difference]: With dead ends: 1235 [2021-11-25 20:17:22,873 INFO L226 Difference]: Without dead ends: 798 [2021-11-25 20:17:22,874 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 [2021-11-25 20:17:22,876 INFO L933 BasicCegarLoop]: 150 mSDtfsCounter, 89 mSDsluCounter, 105 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 89 SdHoareTripleChecker+Valid, 252 SdHoareTripleChecker+Invalid, 16 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 14 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 20:17:22,876 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [89 Valid, 252 Invalid, 16 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 14 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 20:17:22,881 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 798 states. [2021-11-25 20:17:22,963 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 798 to 796. [2021-11-25 20:17:22,965 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 796 states, 795 states have (on average 1.568553459119497) internal successors, (1247), 795 states have internal predecessors, (1247), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:17:22,969 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 796 states to 796 states and 1247 transitions. [2021-11-25 20:17:22,970 INFO L78 Accepts]: Start accepts. Automaton has 796 states and 1247 transitions. Word has length 51 [2021-11-25 20:17:22,971 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:17:22,971 INFO L470 AbstractCegarLoop]: Abstraction has 796 states and 1247 transitions. [2021-11-25 20:17:22,972 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 17.0) internal successors, (51), 3 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:17:22,972 INFO L276 IsEmpty]: Start isEmpty. Operand 796 states and 1247 transitions. [2021-11-25 20:17:22,976 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-11-25 20:17:22,981 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:17:22,982 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:17:22,982 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-25 20:17:22,984 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:17:22,984 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:17:22,985 INFO L85 PathProgramCache]: Analyzing trace with hash -745174181, now seen corresponding path program 1 times [2021-11-25 20:17:22,985 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:17:22,985 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [521985307] [2021-11-25 20:17:22,985 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:17:22,986 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:17:23,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:17:23,106 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:17:23,106 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:17:23,106 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [521985307] [2021-11-25 20:17:23,107 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [521985307] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:17:23,107 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:17:23,107 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 20:17:23,107 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1421460173] [2021-11-25 20:17:23,107 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:17:23,108 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 20:17:23,108 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:17:23,108 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 20:17:23,109 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 20:17:23,109 INFO L87 Difference]: Start difference. First operand 796 states and 1247 transitions. Second operand has 3 states, 3 states have (on average 17.666666666666668) internal successors, (53), 3 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:17:23,217 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:17:23,217 INFO L93 Difference]: Finished difference Result 1995 states and 3163 transitions. [2021-11-25 20:17:23,218 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 20:17:23,218 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 17.666666666666668) internal successors, (53), 3 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 53 [2021-11-25 20:17:23,219 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:17:23,229 INFO L225 Difference]: With dead ends: 1995 [2021-11-25 20:17:23,229 INFO L226 Difference]: Without dead ends: 1249 [2021-11-25 20:17:23,231 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 [2021-11-25 20:17:23,232 INFO L933 BasicCegarLoop]: 137 mSDtfsCounter, 88 mSDsluCounter, 109 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 88 SdHoareTripleChecker+Valid, 243 SdHoareTripleChecker+Invalid, 13 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 13 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 20:17:23,233 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [88 Valid, 243 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 20:17:23,235 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1249 states. [2021-11-25 20:17:23,307 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1249 to 1247. [2021-11-25 20:17:23,310 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1247 states, 1246 states have (on average 1.5762439807383628) internal successors, (1964), 1246 states have internal predecessors, (1964), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:17:23,315 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1247 states to 1247 states and 1964 transitions. [2021-11-25 20:17:23,316 INFO L78 Accepts]: Start accepts. Automaton has 1247 states and 1964 transitions. Word has length 53 [2021-11-25 20:17:23,316 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:17:23,316 INFO L470 AbstractCegarLoop]: Abstraction has 1247 states and 1964 transitions. [2021-11-25 20:17:23,317 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 17.666666666666668) internal successors, (53), 3 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:17:23,317 INFO L276 IsEmpty]: Start isEmpty. Operand 1247 states and 1964 transitions. [2021-11-25 20:17:23,317 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-11-25 20:17:23,317 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:17:23,318 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:17:23,318 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-25 20:17:23,318 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:17:23,319 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:17:23,319 INFO L85 PathProgramCache]: Analyzing trace with hash -585568132, now seen corresponding path program 1 times [2021-11-25 20:17:23,319 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:17:23,319 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [390670175] [2021-11-25 20:17:23,319 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:17:23,320 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:17:23,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:17:23,391 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:17:23,392 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:17:23,392 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [390670175] [2021-11-25 20:17:23,392 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [390670175] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:17:23,392 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:17:23,393 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-25 20:17:23,393 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1159171363] [2021-11-25 20:17:23,393 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:17:23,393 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 20:17:23,394 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:17:23,394 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 20:17:23,394 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-25 20:17:23,395 INFO L87 Difference]: Start difference. First operand 1247 states and 1964 transitions. Second operand has 5 states, 5 states have (on average 11.0) internal successors, (55), 5 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:17:23,737 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:17:23,737 INFO L93 Difference]: Finished difference Result 3944 states and 6219 transitions. [2021-11-25 20:17:23,738 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-25 20:17:23,738 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 11.0) internal successors, (55), 5 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 55 [2021-11-25 20:17:23,739 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:17:23,756 INFO L225 Difference]: With dead ends: 3944 [2021-11-25 20:17:23,756 INFO L226 Difference]: Without dead ends: 2763 [2021-11-25 20:17:23,759 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-11-25 20:17:23,760 INFO L933 BasicCegarLoop]: 134 mSDtfsCounter, 546 mSDsluCounter, 835 mSDsCounter, 0 mSdLazyCounter, 134 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 546 SdHoareTripleChecker+Valid, 959 SdHoareTripleChecker+Invalid, 139 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 134 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:17:23,761 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [546 Valid, 959 Invalid, 139 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 134 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:17:23,766 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2763 states. [2021-11-25 20:17:23,891 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2763 to 1985. [2021-11-25 20:17:23,896 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1985 states, 1984 states have (on average 1.5665322580645162) internal successors, (3108), 1984 states have internal predecessors, (3108), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:17:23,904 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1985 states to 1985 states and 3108 transitions. [2021-11-25 20:17:23,905 INFO L78 Accepts]: Start accepts. Automaton has 1985 states and 3108 transitions. Word has length 55 [2021-11-25 20:17:23,906 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:17:23,906 INFO L470 AbstractCegarLoop]: Abstraction has 1985 states and 3108 transitions. [2021-11-25 20:17:23,906 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 11.0) internal successors, (55), 5 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:17:23,906 INFO L276 IsEmpty]: Start isEmpty. Operand 1985 states and 3108 transitions. [2021-11-25 20:17:23,907 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-11-25 20:17:23,907 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:17:23,907 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:17:23,907 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-25 20:17:23,908 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:17:23,910 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:17:23,910 INFO L85 PathProgramCache]: Analyzing trace with hash -1035247094, now seen corresponding path program 1 times [2021-11-25 20:17:23,910 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:17:23,910 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [244887832] [2021-11-25 20:17:23,911 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:17:23,911 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:17:23,933 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:17:23,993 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:17:23,994 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:17:23,994 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [244887832] [2021-11-25 20:17:23,994 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [244887832] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:17:23,994 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:17:23,995 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 20:17:23,995 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [157297717] [2021-11-25 20:17:23,995 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:17:23,996 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 20:17:23,997 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:17:23,997 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 20:17:23,997 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 20:17:23,998 INFO L87 Difference]: Start difference. First operand 1985 states and 3108 transitions. Second operand has 4 states, 4 states have (on average 14.0) internal successors, (56), 4 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:17:24,228 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:17:24,229 INFO L93 Difference]: Finished difference Result 4674 states and 7329 transitions. [2021-11-25 20:17:24,229 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 20:17:24,229 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 14.0) internal successors, (56), 4 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 56 [2021-11-25 20:17:24,229 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:17:24,246 INFO L225 Difference]: With dead ends: 4674 [2021-11-25 20:17:24,246 INFO L226 Difference]: Without dead ends: 2755 [2021-11-25 20:17:24,250 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-25 20:17:24,251 INFO L933 BasicCegarLoop]: 127 mSDtfsCounter, 182 mSDsluCounter, 225 mSDsCounter, 0 mSdLazyCounter, 43 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 182 SdHoareTripleChecker+Valid, 347 SdHoareTripleChecker+Invalid, 43 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 43 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:17:24,251 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [182 Valid, 347 Invalid, 43 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 43 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:17:24,255 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2755 states. [2021-11-25 20:17:24,416 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2755 to 2753. [2021-11-25 20:17:24,423 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2753 states, 2752 states have (on average 1.5588662790697674) internal successors, (4290), 2752 states have internal predecessors, (4290), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:17:24,435 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2753 states to 2753 states and 4290 transitions. [2021-11-25 20:17:24,435 INFO L78 Accepts]: Start accepts. Automaton has 2753 states and 4290 transitions. Word has length 56 [2021-11-25 20:17:24,435 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:17:24,435 INFO L470 AbstractCegarLoop]: Abstraction has 2753 states and 4290 transitions. [2021-11-25 20:17:24,436 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 14.0) internal successors, (56), 4 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:17:24,436 INFO L276 IsEmpty]: Start isEmpty. Operand 2753 states and 4290 transitions. [2021-11-25 20:17:24,436 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-11-25 20:17:24,436 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:17:24,436 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:17:24,437 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-25 20:17:24,437 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:17:24,437 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:17:24,437 INFO L85 PathProgramCache]: Analyzing trace with hash -2085835005, now seen corresponding path program 1 times [2021-11-25 20:17:24,438 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:17:24,438 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1305198382] [2021-11-25 20:17:24,438 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:17:24,438 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:17:24,454 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:17:24,486 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:17:24,486 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:17:24,486 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1305198382] [2021-11-25 20:17:24,486 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1305198382] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:17:24,486 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:17:24,486 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 20:17:24,487 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1188811905] [2021-11-25 20:17:24,487 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:17:24,487 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 20:17:24,487 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:17:24,488 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 20:17:24,488 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 20:17:24,488 INFO L87 Difference]: Start difference. First operand 2753 states and 4290 transitions. Second operand has 4 states, 4 states have (on average 14.25) internal successors, (57), 4 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:17:24,731 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:17:24,731 INFO L93 Difference]: Finished difference Result 5442 states and 8499 transitions. [2021-11-25 20:17:24,732 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 20:17:24,732 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 14.25) internal successors, (57), 4 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 57 [2021-11-25 20:17:24,732 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:17:24,749 INFO L225 Difference]: With dead ends: 5442 [2021-11-25 20:17:24,749 INFO L226 Difference]: Without dead ends: 2755 [2021-11-25 20:17:24,754 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-25 20:17:24,756 INFO L933 BasicCegarLoop]: 131 mSDtfsCounter, 190 mSDsluCounter, 227 mSDsCounter, 0 mSdLazyCounter, 44 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 190 SdHoareTripleChecker+Valid, 353 SdHoareTripleChecker+Invalid, 44 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 44 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:17:24,757 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [190 Valid, 353 Invalid, 44 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 44 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:17:24,761 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2755 states. [2021-11-25 20:17:24,950 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2755 to 2753. [2021-11-25 20:17:24,956 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2753 states, 2752 states have (on average 1.552688953488372) internal successors, (4273), 2752 states have internal predecessors, (4273), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:17:24,970 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2753 states to 2753 states and 4273 transitions. [2021-11-25 20:17:24,970 INFO L78 Accepts]: Start accepts. Automaton has 2753 states and 4273 transitions. Word has length 57 [2021-11-25 20:17:24,970 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:17:24,971 INFO L470 AbstractCegarLoop]: Abstraction has 2753 states and 4273 transitions. [2021-11-25 20:17:24,971 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 14.25) internal successors, (57), 4 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:17:24,971 INFO L276 IsEmpty]: Start isEmpty. Operand 2753 states and 4273 transitions. [2021-11-25 20:17:24,972 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-11-25 20:17:24,972 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:17:24,972 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:17:24,972 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-11-25 20:17:24,972 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:17:24,973 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:17:24,973 INFO L85 PathProgramCache]: Analyzing trace with hash -289763855, now seen corresponding path program 1 times [2021-11-25 20:17:24,973 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:17:24,973 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1677896105] [2021-11-25 20:17:24,973 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:17:24,974 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:17:25,007 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:17:25,049 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:17:25,050 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:17:25,050 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1677896105] [2021-11-25 20:17:25,050 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1677896105] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:17:25,050 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:17:25,051 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 20:17:25,052 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [241006243] [2021-11-25 20:17:25,052 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:17:25,056 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 20:17:25,056 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:17:25,057 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 20:17:25,057 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 20:17:25,057 INFO L87 Difference]: Start difference. First operand 2753 states and 4273 transitions. Second operand has 4 states, 4 states have (on average 14.5) internal successors, (58), 4 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:17:25,279 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:17:25,279 INFO L93 Difference]: Finished difference Result 5442 states and 8465 transitions. [2021-11-25 20:17:25,280 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 20:17:25,280 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 14.5) internal successors, (58), 4 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 58 [2021-11-25 20:17:25,280 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:17:25,297 INFO L225 Difference]: With dead ends: 5442 [2021-11-25 20:17:25,297 INFO L226 Difference]: Without dead ends: 2755 [2021-11-25 20:17:25,301 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-25 20:17:25,303 INFO L933 BasicCegarLoop]: 132 mSDtfsCounter, 188 mSDsluCounter, 229 mSDsCounter, 0 mSdLazyCounter, 43 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 188 SdHoareTripleChecker+Valid, 356 SdHoareTripleChecker+Invalid, 43 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 43 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 20:17:25,304 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [188 Valid, 356 Invalid, 43 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 43 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 20:17:25,308 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2755 states. [2021-11-25 20:17:25,486 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2755 to 2753. [2021-11-25 20:17:25,493 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2753 states, 2752 states have (on average 1.5465116279069768) internal successors, (4256), 2752 states have internal predecessors, (4256), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:17:25,503 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2753 states to 2753 states and 4256 transitions. [2021-11-25 20:17:25,504 INFO L78 Accepts]: Start accepts. Automaton has 2753 states and 4256 transitions. Word has length 58 [2021-11-25 20:17:25,504 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:17:25,504 INFO L470 AbstractCegarLoop]: Abstraction has 2753 states and 4256 transitions. [2021-11-25 20:17:25,504 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 14.5) internal successors, (58), 4 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:17:25,505 INFO L276 IsEmpty]: Start isEmpty. Operand 2753 states and 4256 transitions. [2021-11-25 20:17:25,505 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-25 20:17:25,505 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:17:25,505 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:17:25,505 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-11-25 20:17:25,506 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:17:25,506 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:17:25,506 INFO L85 PathProgramCache]: Analyzing trace with hash -807501630, now seen corresponding path program 1 times [2021-11-25 20:17:25,506 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:17:25,506 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1164246342] [2021-11-25 20:17:25,507 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:17:25,507 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:17:25,523 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:17:25,611 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:17:25,611 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:17:25,611 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1164246342] [2021-11-25 20:17:25,611 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1164246342] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:17:25,611 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:17:25,612 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-25 20:17:25,612 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [183007579] [2021-11-25 20:17:25,612 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:17:25,612 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 20:17:25,612 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:17:25,613 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 20:17:25,613 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-25 20:17:25,613 INFO L87 Difference]: Start difference. First operand 2753 states and 4256 transitions. Second operand has 5 states, 5 states have (on average 12.0) internal successors, (60), 5 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:17:25,896 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:17:25,896 INFO L93 Difference]: Finished difference Result 5442 states and 8431 transitions. [2021-11-25 20:17:25,896 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 20:17:25,897 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 12.0) internal successors, (60), 5 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 60 [2021-11-25 20:17:25,897 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:17:25,913 INFO L225 Difference]: With dead ends: 5442 [2021-11-25 20:17:25,913 INFO L226 Difference]: Without dead ends: 2755 [2021-11-25 20:17:25,918 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=16, Unknown=0, NotChecked=0, Total=30 [2021-11-25 20:17:25,919 INFO L933 BasicCegarLoop]: 130 mSDtfsCounter, 145 mSDsluCounter, 321 mSDsCounter, 0 mSdLazyCounter, 75 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 145 SdHoareTripleChecker+Valid, 448 SdHoareTripleChecker+Invalid, 76 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 75 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:17:25,919 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [145 Valid, 448 Invalid, 76 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 75 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:17:25,923 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2755 states. [2021-11-25 20:17:26,133 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2755 to 2753. [2021-11-25 20:17:26,140 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2753 states, 2752 states have (on average 1.5421511627906976) internal successors, (4244), 2752 states have internal predecessors, (4244), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:17:26,150 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2753 states to 2753 states and 4244 transitions. [2021-11-25 20:17:26,150 INFO L78 Accepts]: Start accepts. Automaton has 2753 states and 4244 transitions. Word has length 60 [2021-11-25 20:17:26,150 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:17:26,150 INFO L470 AbstractCegarLoop]: Abstraction has 2753 states and 4244 transitions. [2021-11-25 20:17:26,151 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 12.0) internal successors, (60), 5 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:17:26,151 INFO L276 IsEmpty]: Start isEmpty. Operand 2753 states and 4244 transitions. [2021-11-25 20:17:26,156 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-11-25 20:17:26,157 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:17:26,157 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:17:26,157 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-11-25 20:17:26,157 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:17:26,158 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:17:26,158 INFO L85 PathProgramCache]: Analyzing trace with hash 2077186613, now seen corresponding path program 1 times [2021-11-25 20:17:26,158 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:17:26,158 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [717154605] [2021-11-25 20:17:26,158 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:17:26,158 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:17:26,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:17:26,294 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:17:26,294 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:17:26,295 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [717154605] [2021-11-25 20:17:26,295 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [717154605] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:17:26,295 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:17:26,295 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-25 20:17:26,295 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1076447649] [2021-11-25 20:17:26,296 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:17:26,296 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 20:17:26,296 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:17:26,297 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 20:17:26,297 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-25 20:17:26,297 INFO L87 Difference]: Start difference. First operand 2753 states and 4244 transitions. Second operand has 5 states, 5 states have (on average 12.6) internal successors, (63), 5 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:17:26,684 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:17:26,685 INFO L93 Difference]: Finished difference Result 7105 states and 10944 transitions. [2021-11-25 20:17:26,685 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 20:17:26,685 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 12.6) internal successors, (63), 5 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 63 [2021-11-25 20:17:26,686 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:17:26,711 INFO L225 Difference]: With dead ends: 7105 [2021-11-25 20:17:26,711 INFO L226 Difference]: Without dead ends: 4418 [2021-11-25 20:17:26,716 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=16, Unknown=0, NotChecked=0, Total=30 [2021-11-25 20:17:26,717 INFO L933 BasicCegarLoop]: 135 mSDtfsCounter, 290 mSDsluCounter, 226 mSDsCounter, 0 mSdLazyCounter, 46 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 290 SdHoareTripleChecker+Valid, 361 SdHoareTripleChecker+Invalid, 49 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 46 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:17:26,717 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [290 Valid, 361 Invalid, 49 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 46 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:17:26,723 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4418 states. [2021-11-25 20:17:27,051 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4418 to 4416. [2021-11-25 20:17:27,061 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4416 states, 4415 states have (on average 1.5322763306908267) internal successors, (6765), 4415 states have internal predecessors, (6765), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:17:27,078 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4416 states to 4416 states and 6765 transitions. [2021-11-25 20:17:27,079 INFO L78 Accepts]: Start accepts. Automaton has 4416 states and 6765 transitions. Word has length 63 [2021-11-25 20:17:27,079 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:17:27,079 INFO L470 AbstractCegarLoop]: Abstraction has 4416 states and 6765 transitions. [2021-11-25 20:17:27,079 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 12.6) internal successors, (63), 5 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:17:27,079 INFO L276 IsEmpty]: Start isEmpty. Operand 4416 states and 6765 transitions. [2021-11-25 20:17:27,080 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-25 20:17:27,080 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:17:27,080 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:17:27,081 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-11-25 20:17:27,081 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:17:27,081 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:17:27,082 INFO L85 PathProgramCache]: Analyzing trace with hash -20376734, now seen corresponding path program 1 times [2021-11-25 20:17:27,082 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:17:27,082 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1840124800] [2021-11-25 20:17:27,082 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:17:27,082 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:17:27,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:17:27,198 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:17:27,198 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:17:27,198 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1840124800] [2021-11-25 20:17:27,199 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1840124800] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:17:27,199 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:17:27,199 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-25 20:17:27,199 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1371549472] [2021-11-25 20:17:27,199 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:17:27,200 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-25 20:17:27,200 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:17:27,200 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-25 20:17:27,201 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-25 20:17:27,201 INFO L87 Difference]: Start difference. First operand 4416 states and 6765 transitions. Second operand has 6 states, 6 states have (on average 10.666666666666666) internal successors, (64), 6 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:17:27,725 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:17:27,725 INFO L93 Difference]: Finished difference Result 5613 states and 8557 transitions. [2021-11-25 20:17:27,725 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-25 20:17:27,726 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 10.666666666666666) internal successors, (64), 6 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 64 [2021-11-25 20:17:27,726 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:17:27,753 INFO L225 Difference]: With dead ends: 5613 [2021-11-25 20:17:27,753 INFO L226 Difference]: Without dead ends: 5611 [2021-11-25 20:17:27,755 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2021-11-25 20:17:27,755 INFO L933 BasicCegarLoop]: 277 mSDtfsCounter, 257 mSDsluCounter, 551 mSDsCounter, 0 mSdLazyCounter, 104 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 257 SdHoareTripleChecker+Valid, 816 SdHoareTripleChecker+Invalid, 107 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 104 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:17:27,756 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [257 Valid, 816 Invalid, 107 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 104 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:17:27,763 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5611 states. [2021-11-25 20:17:28,044 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5611 to 4430. [2021-11-25 20:17:28,054 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4430 states, 4429 states have (on average 1.5281101828855272) internal successors, (6768), 4429 states have internal predecessors, (6768), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:17:28,065 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4430 states to 4430 states and 6768 transitions. [2021-11-25 20:17:28,065 INFO L78 Accepts]: Start accepts. Automaton has 4430 states and 6768 transitions. Word has length 64 [2021-11-25 20:17:28,066 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:17:28,066 INFO L470 AbstractCegarLoop]: Abstraction has 4430 states and 6768 transitions. [2021-11-25 20:17:28,066 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 10.666666666666666) internal successors, (64), 6 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:17:28,066 INFO L276 IsEmpty]: Start isEmpty. Operand 4430 states and 6768 transitions. [2021-11-25 20:17:28,067 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-11-25 20:17:28,067 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:17:28,068 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:17:28,068 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2021-11-25 20:17:28,068 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:17:28,069 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:17:28,069 INFO L85 PathProgramCache]: Analyzing trace with hash 329424148, now seen corresponding path program 1 times [2021-11-25 20:17:28,069 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:17:28,069 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [586963803] [2021-11-25 20:17:28,069 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:17:28,070 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:17:28,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:17:28,669 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 20:17:28,670 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:17:28,670 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [586963803] [2021-11-25 20:17:28,670 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [586963803] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:17:28,670 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [253584253] [2021-11-25 20:17:28,671 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:17:28,671 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:17:28,671 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_be12730d-dc33-4766-b171-b2d9f2e5ca30/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:17:28,676 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_be12730d-dc33-4766-b171-b2d9f2e5ca30/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:17:28,698 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_be12730d-dc33-4766-b171-b2d9f2e5ca30/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-25 20:17:28,817 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:17:28,820 INFO L263 TraceCheckSpWp]: Trace formula consists of 389 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-25 20:17:28,827 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:17:29,815 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 20:17:29,815 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 20:17:29,815 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [253584253] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:17:29,815 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 20:17:29,816 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [10] total 13 [2021-11-25 20:17:29,816 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1661074116] [2021-11-25 20:17:29,816 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:17:29,817 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 20:17:29,818 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:17:29,818 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 20:17:29,818 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=118, Unknown=0, NotChecked=0, Total=156 [2021-11-25 20:17:29,818 INFO L87 Difference]: Start difference. First operand 4430 states and 6768 transitions. Second operand has 5 states, 5 states have (on average 14.2) internal successors, (71), 4 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:17:30,768 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:17:30,769 INFO L93 Difference]: Finished difference Result 12815 states and 19588 transitions. [2021-11-25 20:17:30,770 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 20:17:30,770 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 14.2) internal successors, (71), 4 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 74 [2021-11-25 20:17:30,770 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:17:30,799 INFO L225 Difference]: With dead ends: 12815 [2021-11-25 20:17:30,799 INFO L226 Difference]: Without dead ends: 8448 [2021-11-25 20:17:30,808 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 72 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=48, Invalid=162, Unknown=0, NotChecked=0, Total=210 [2021-11-25 20:17:30,808 INFO L933 BasicCegarLoop]: 216 mSDtfsCounter, 322 mSDsluCounter, 120 mSDsCounter, 0 mSdLazyCounter, 22 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 322 SdHoareTripleChecker+Valid, 334 SdHoareTripleChecker+Invalid, 23 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 22 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 20:17:30,809 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [322 Valid, 334 Invalid, 23 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 22 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 20:17:30,824 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8448 states. [2021-11-25 20:17:31,606 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8448 to 8446. [2021-11-25 20:17:31,625 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8446 states, 8445 states have (on average 1.5188869153345175) internal successors, (12827), 8445 states have internal predecessors, (12827), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:17:31,663 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8446 states to 8446 states and 12827 transitions. [2021-11-25 20:17:31,663 INFO L78 Accepts]: Start accepts. Automaton has 8446 states and 12827 transitions. Word has length 74 [2021-11-25 20:17:31,663 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:17:31,664 INFO L470 AbstractCegarLoop]: Abstraction has 8446 states and 12827 transitions. [2021-11-25 20:17:31,664 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 14.2) internal successors, (71), 4 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:17:31,665 INFO L276 IsEmpty]: Start isEmpty. Operand 8446 states and 12827 transitions. [2021-11-25 20:17:31,666 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-11-25 20:17:31,666 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:17:31,667 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:17:31,703 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_be12730d-dc33-4766-b171-b2d9f2e5ca30/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2021-11-25 20:17:31,880 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_be12730d-dc33-4766-b171-b2d9f2e5ca30/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-11-25 20:17:31,881 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:17:31,881 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:17:31,881 INFO L85 PathProgramCache]: Analyzing trace with hash -1783789587, now seen corresponding path program 1 times [2021-11-25 20:17:31,881 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:17:31,881 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1532785727] [2021-11-25 20:17:31,881 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:17:31,882 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:17:31,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:17:31,931 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 20:17:31,932 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:17:31,932 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1532785727] [2021-11-25 20:17:31,932 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1532785727] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:17:31,932 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:17:31,933 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 20:17:31,935 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [771906652] [2021-11-25 20:17:31,935 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:17:31,935 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 20:17:31,936 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:17:31,936 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 20:17:31,936 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 20:17:31,936 INFO L87 Difference]: Start difference. First operand 8446 states and 12827 transitions. Second operand has 3 states, 3 states have (on average 24.0) internal successors, (72), 3 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:17:32,900 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:17:32,901 INFO L93 Difference]: Finished difference Result 19834 states and 30241 transitions. [2021-11-25 20:17:32,903 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 20:17:32,904 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 24.0) internal successors, (72), 3 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 75 [2021-11-25 20:17:32,904 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:17:32,932 INFO L225 Difference]: With dead ends: 19834 [2021-11-25 20:17:32,932 INFO L226 Difference]: Without dead ends: 11446 [2021-11-25 20:17:32,943 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 [2021-11-25 20:17:32,944 INFO L933 BasicCegarLoop]: 145 mSDtfsCounter, 91 mSDsluCounter, 115 mSDsCounter, 0 mSdLazyCounter, 15 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 91 SdHoareTripleChecker+Valid, 257 SdHoareTripleChecker+Invalid, 18 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 15 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 20:17:32,944 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [91 Valid, 257 Invalid, 18 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 15 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 20:17:32,959 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11446 states. [2021-11-25 20:17:33,753 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11446 to 11444. [2021-11-25 20:17:33,763 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11444 states, 11443 states have (on average 1.5093069999126103) internal successors, (17271), 11443 states have internal predecessors, (17271), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:17:33,796 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11444 states to 11444 states and 17271 transitions. [2021-11-25 20:17:33,797 INFO L78 Accepts]: Start accepts. Automaton has 11444 states and 17271 transitions. Word has length 75 [2021-11-25 20:17:33,797 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:17:33,797 INFO L470 AbstractCegarLoop]: Abstraction has 11444 states and 17271 transitions. [2021-11-25 20:17:33,797 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 24.0) internal successors, (72), 3 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:17:33,798 INFO L276 IsEmpty]: Start isEmpty. Operand 11444 states and 17271 transitions. [2021-11-25 20:17:33,799 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2021-11-25 20:17:33,799 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:17:33,799 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:17:33,799 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2021-11-25 20:17:33,799 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:17:33,800 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:17:33,800 INFO L85 PathProgramCache]: Analyzing trace with hash -1046963442, now seen corresponding path program 1 times [2021-11-25 20:17:33,800 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:17:33,801 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [906763539] [2021-11-25 20:17:33,801 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:17:33,801 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:17:33,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:17:33,873 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 20:17:33,873 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:17:33,873 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [906763539] [2021-11-25 20:17:33,873 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [906763539] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:17:33,874 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:17:33,874 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 20:17:33,874 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [37882702] [2021-11-25 20:17:33,874 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:17:33,875 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 20:17:33,875 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:17:33,875 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 20:17:33,875 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-25 20:17:33,876 INFO L87 Difference]: Start difference. First operand 11444 states and 17271 transitions. Second operand has 5 states, 5 states have (on average 15.0) internal successors, (75), 4 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:17:34,764 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:17:34,765 INFO L93 Difference]: Finished difference Result 22832 states and 34475 transitions. [2021-11-25 20:17:34,765 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 20:17:34,765 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 15.0) internal successors, (75), 4 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 78 [2021-11-25 20:17:34,765 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:17:34,793 INFO L225 Difference]: With dead ends: 22832 [2021-11-25 20:17:34,793 INFO L226 Difference]: Without dead ends: 11444 [2021-11-25 20:17:34,807 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-11-25 20:17:34,808 INFO L933 BasicCegarLoop]: 104 mSDtfsCounter, 334 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 334 SdHoareTripleChecker+Valid, 122 SdHoareTripleChecker+Invalid, 38 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 20:17:34,808 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [334 Valid, 122 Invalid, 38 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 34 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 20:17:34,820 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11444 states. [2021-11-25 20:17:35,602 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11444 to 11444. [2021-11-25 20:17:35,614 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11444 states, 11443 states have (on average 1.4907803897579306) internal successors, (17059), 11443 states have internal predecessors, (17059), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:17:35,638 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11444 states to 11444 states and 17059 transitions. [2021-11-25 20:17:35,638 INFO L78 Accepts]: Start accepts. Automaton has 11444 states and 17059 transitions. Word has length 78 [2021-11-25 20:17:35,639 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:17:35,639 INFO L470 AbstractCegarLoop]: Abstraction has 11444 states and 17059 transitions. [2021-11-25 20:17:35,639 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 15.0) internal successors, (75), 4 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:17:35,639 INFO L276 IsEmpty]: Start isEmpty. Operand 11444 states and 17059 transitions. [2021-11-25 20:17:35,640 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2021-11-25 20:17:35,640 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:17:35,640 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:17:35,641 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2021-11-25 20:17:35,641 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:17:35,641 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:17:35,641 INFO L85 PathProgramCache]: Analyzing trace with hash -1672225687, now seen corresponding path program 1 times [2021-11-25 20:17:35,642 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:17:35,642 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [50656936] [2021-11-25 20:17:35,642 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:17:35,642 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:17:35,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:17:36,744 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 20:17:36,744 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:17:36,744 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [50656936] [2021-11-25 20:17:36,745 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [50656936] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:17:36,745 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [335904085] [2021-11-25 20:17:36,745 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:17:36,745 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:17:36,745 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_be12730d-dc33-4766-b171-b2d9f2e5ca30/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:17:36,746 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_be12730d-dc33-4766-b171-b2d9f2e5ca30/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:17:36,762 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_be12730d-dc33-4766-b171-b2d9f2e5ca30/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-25 20:17:36,879 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:17:36,882 INFO L263 TraceCheckSpWp]: Trace formula consists of 396 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-25 20:17:36,886 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:17:37,514 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-25 20:17:37,515 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 20:17:37,515 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [335904085] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:17:37,515 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 20:17:37,515 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [10] total 13 [2021-11-25 20:17:37,516 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2075413349] [2021-11-25 20:17:37,516 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:17:37,517 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 20:17:37,517 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:17:37,517 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 20:17:37,517 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=118, Unknown=0, NotChecked=0, Total=156 [2021-11-25 20:17:37,518 INFO L87 Difference]: Start difference. First operand 11444 states and 17059 transitions. Second operand has 5 states, 5 states have (on average 14.8) internal successors, (74), 4 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:17:39,414 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:17:39,415 INFO L93 Difference]: Finished difference Result 33419 states and 49757 transitions. [2021-11-25 20:17:39,415 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 20:17:39,415 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 14.8) internal successors, (74), 4 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 78 [2021-11-25 20:17:39,416 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:17:39,475 INFO L225 Difference]: With dead ends: 33419 [2021-11-25 20:17:39,475 INFO L226 Difference]: Without dead ends: 22022 [2021-11-25 20:17:39,497 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 76 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 47 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=48, Invalid=162, Unknown=0, NotChecked=0, Total=210 [2021-11-25 20:17:39,498 INFO L933 BasicCegarLoop]: 212 mSDtfsCounter, 324 mSDsluCounter, 118 mSDsCounter, 0 mSdLazyCounter, 22 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 324 SdHoareTripleChecker+Valid, 328 SdHoareTripleChecker+Invalid, 23 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 22 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 20:17:39,498 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [324 Valid, 328 Invalid, 23 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 22 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 20:17:39,522 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22022 states. [2021-11-25 20:17:41,346 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22022 to 22020. [2021-11-25 20:17:41,365 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22020 states, 22019 states have (on average 1.4799491348380944) internal successors, (32587), 22019 states have internal predecessors, (32587), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:17:41,410 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22020 states to 22020 states and 32587 transitions. [2021-11-25 20:17:41,410 INFO L78 Accepts]: Start accepts. Automaton has 22020 states and 32587 transitions. Word has length 78 [2021-11-25 20:17:41,410 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:17:41,410 INFO L470 AbstractCegarLoop]: Abstraction has 22020 states and 32587 transitions. [2021-11-25 20:17:41,411 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 14.8) internal successors, (74), 4 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:17:41,411 INFO L276 IsEmpty]: Start isEmpty. Operand 22020 states and 32587 transitions. [2021-11-25 20:17:41,412 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-11-25 20:17:41,413 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:17:41,413 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:17:41,447 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_be12730d-dc33-4766-b171-b2d9f2e5ca30/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-25 20:17:41,628 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_be12730d-dc33-4766-b171-b2d9f2e5ca30/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-11-25 20:17:41,629 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:17:41,629 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:17:41,629 INFO L85 PathProgramCache]: Analyzing trace with hash -139066846, now seen corresponding path program 1 times [2021-11-25 20:17:41,629 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:17:41,629 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1782739080] [2021-11-25 20:17:41,629 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:17:41,629 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:17:41,664 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:17:41,689 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-25 20:17:41,689 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:17:41,689 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1782739080] [2021-11-25 20:17:41,689 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1782739080] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:17:41,690 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:17:41,690 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 20:17:41,690 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1131313860] [2021-11-25 20:17:41,690 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:17:41,690 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 20:17:41,691 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:17:41,691 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 20:17:41,691 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 20:17:41,692 INFO L87 Difference]: Start difference. First operand 22020 states and 32587 transitions. Second operand has 3 states, 3 states have (on average 25.0) internal successors, (75), 3 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:17:43,862 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:17:43,862 INFO L93 Difference]: Finished difference Result 50328 states and 74421 transitions. [2021-11-25 20:17:43,862 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 20:17:43,863 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 25.0) internal successors, (75), 3 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 79 [2021-11-25 20:17:43,863 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:17:43,914 INFO L225 Difference]: With dead ends: 50328 [2021-11-25 20:17:43,915 INFO L226 Difference]: Without dead ends: 28350 [2021-11-25 20:17:43,944 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 [2021-11-25 20:17:43,945 INFO L933 BasicCegarLoop]: 139 mSDtfsCounter, 89 mSDsluCounter, 112 mSDsCounter, 0 mSdLazyCounter, 16 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 89 SdHoareTripleChecker+Valid, 248 SdHoareTripleChecker+Invalid, 19 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 16 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 20:17:43,945 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [89 Valid, 248 Invalid, 19 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 16 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 20:17:43,971 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28350 states. [2021-11-25 20:17:46,825 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28350 to 28348. [2021-11-25 20:17:46,849 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28348 states, 28347 states have (on average 1.460789501534554) internal successors, (41409), 28347 states have internal predecessors, (41409), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:17:46,912 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28348 states to 28348 states and 41409 transitions. [2021-11-25 20:17:46,912 INFO L78 Accepts]: Start accepts. Automaton has 28348 states and 41409 transitions. Word has length 79 [2021-11-25 20:17:46,912 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:17:46,912 INFO L470 AbstractCegarLoop]: Abstraction has 28348 states and 41409 transitions. [2021-11-25 20:17:46,912 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 25.0) internal successors, (75), 3 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:17:46,913 INFO L276 IsEmpty]: Start isEmpty. Operand 28348 states and 41409 transitions. [2021-11-25 20:17:46,914 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-11-25 20:17:46,914 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:17:46,914 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:17:46,914 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2021-11-25 20:17:46,915 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:17:46,915 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:17:46,915 INFO L85 PathProgramCache]: Analyzing trace with hash -216121986, now seen corresponding path program 1 times [2021-11-25 20:17:46,915 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:17:46,916 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [717374829] [2021-11-25 20:17:46,916 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:17:46,916 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:17:46,962 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:17:47,473 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 20:17:47,473 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:17:47,473 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [717374829] [2021-11-25 20:17:47,473 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [717374829] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:17:47,473 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [310779734] [2021-11-25 20:17:47,474 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:17:47,474 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:17:47,474 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_be12730d-dc33-4766-b171-b2d9f2e5ca30/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:17:47,477 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_be12730d-dc33-4766-b171-b2d9f2e5ca30/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:17:47,498 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_be12730d-dc33-4766-b171-b2d9f2e5ca30/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-25 20:17:47,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:17:47,616 INFO L263 TraceCheckSpWp]: Trace formula consists of 403 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-25 20:17:47,622 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:17:48,329 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-25 20:17:48,330 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 20:17:48,330 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [310779734] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:17:48,330 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 20:17:48,330 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [10] total 13 [2021-11-25 20:17:48,331 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [400693139] [2021-11-25 20:17:48,331 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:17:48,332 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 20:17:48,332 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:17:48,332 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 20:17:48,333 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=118, Unknown=0, NotChecked=0, Total=156 [2021-11-25 20:17:48,333 INFO L87 Difference]: Start difference. First operand 28348 states and 41409 transitions. Second operand has 5 states, 5 states have (on average 16.0) internal successors, (80), 4 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:17:53,623 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:17:53,623 INFO L93 Difference]: Finished difference Result 82776 states and 120683 transitions. [2021-11-25 20:17:53,624 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 20:17:53,624 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 16.0) internal successors, (80), 4 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 82 [2021-11-25 20:17:53,625 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:17:53,718 INFO L225 Difference]: With dead ends: 82776 [2021-11-25 20:17:53,718 INFO L226 Difference]: Without dead ends: 54522 [2021-11-25 20:17:53,746 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 80 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=48, Invalid=162, Unknown=0, NotChecked=0, Total=210 [2021-11-25 20:17:53,747 INFO L933 BasicCegarLoop]: 210 mSDtfsCounter, 301 mSDsluCounter, 118 mSDsCounter, 0 mSdLazyCounter, 24 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 301 SdHoareTripleChecker+Valid, 326 SdHoareTripleChecker+Invalid, 25 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 24 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 20:17:53,748 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [301 Valid, 326 Invalid, 25 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 24 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 20:17:53,801 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54522 states. [2021-11-25 20:17:59,222 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54522 to 54520. [2021-11-25 20:17:59,263 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54520 states, 54519 states have (on average 1.448394137823511) internal successors, (78965), 54519 states have internal predecessors, (78965), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:17:59,383 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54520 states to 54520 states and 78965 transitions. [2021-11-25 20:17:59,383 INFO L78 Accepts]: Start accepts. Automaton has 54520 states and 78965 transitions. Word has length 82 [2021-11-25 20:17:59,384 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:17:59,384 INFO L470 AbstractCegarLoop]: Abstraction has 54520 states and 78965 transitions. [2021-11-25 20:17:59,384 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 16.0) internal successors, (80), 4 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:17:59,384 INFO L276 IsEmpty]: Start isEmpty. Operand 54520 states and 78965 transitions. [2021-11-25 20:17:59,386 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-11-25 20:17:59,387 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:17:59,387 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:17:59,415 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_be12730d-dc33-4766-b171-b2d9f2e5ca30/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2021-11-25 20:17:59,603 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_be12730d-dc33-4766-b171-b2d9f2e5ca30/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:17:59,604 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:17:59,604 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:17:59,604 INFO L85 PathProgramCache]: Analyzing trace with hash 895804263, now seen corresponding path program 1 times [2021-11-25 20:17:59,604 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:17:59,604 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [176374911] [2021-11-25 20:17:59,604 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:17:59,604 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:17:59,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:17:59,662 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-25 20:17:59,662 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:17:59,663 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [176374911] [2021-11-25 20:17:59,663 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [176374911] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:17:59,663 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:17:59,663 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 20:17:59,663 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1508734781] [2021-11-25 20:17:59,664 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:17:59,664 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 20:17:59,664 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:17:59,665 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 20:17:59,665 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 20:17:59,665 INFO L87 Difference]: Start difference. First operand 54520 states and 78965 transitions. Second operand has 3 states, 3 states have (on average 27.0) internal successors, (81), 3 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:18:07,069 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:18:07,069 INFO L93 Difference]: Finished difference Result 127344 states and 185003 transitions. [2021-11-25 20:18:07,069 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 20:18:07,069 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 27.0) internal successors, (81), 3 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 83 [2021-11-25 20:18:07,070 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:18:07,191 INFO L225 Difference]: With dead ends: 127344 [2021-11-25 20:18:07,191 INFO L226 Difference]: Without dead ends: 72918 [2021-11-25 20:18:07,246 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 [2021-11-25 20:18:07,247 INFO L933 BasicCegarLoop]: 147 mSDtfsCounter, 75 mSDsluCounter, 114 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 75 SdHoareTripleChecker+Valid, 258 SdHoareTripleChecker+Invalid, 17 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 14 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:18:07,248 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [75 Valid, 258 Invalid, 17 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 14 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:18:07,311 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72918 states.