./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/recursive-simple/fibo_2calls_4-2.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 4e77c044 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/config/TaipanReach.xml -i ../../sv-benchmarks/c/recursive-simple/fibo_2calls_4-2.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8 --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 f684876205455ff045e7b27eb3c5cbf35fa59fa1 ..................................................................................................................................................................................................................................................................................................................................................................................................... Execution finished normally Using bit-precise analysis Retrying with bit-precise analysis Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/config/TaipanReach.xml -i ../../sv-benchmarks/c/recursive-simple/fibo_2calls_4-2.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/config/svcomp-Reach-32bit-Taipan_Bitvector.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8 --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 f684876205455ff045e7b27eb3c5cbf35fa59fa1 ................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ Execution finished normally Writing output log to file Ultimate.log Writing human readable error path to file UltimateCounterExample.errorpath Result: FALSE --- Real Ultimate output --- This is Ultimate 0.2.1-dev-4e77c04 [2021-10-13 06:44:03,355 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-10-13 06:44:03,358 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-10-13 06:44:03,417 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-10-13 06:44:03,418 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-10-13 06:44:03,422 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-10-13 06:44:03,424 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-10-13 06:44:03,428 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-10-13 06:44:03,431 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-10-13 06:44:03,437 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-10-13 06:44:03,438 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-10-13 06:44:03,440 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-10-13 06:44:03,440 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-10-13 06:44:03,443 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-10-13 06:44:03,445 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-10-13 06:44:03,454 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-10-13 06:44:03,455 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-10-13 06:44:03,456 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-10-13 06:44:03,459 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-10-13 06:44:03,461 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-10-13 06:44:03,463 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-10-13 06:44:03,464 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-10-13 06:44:03,466 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-10-13 06:44:03,467 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-10-13 06:44:03,470 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-10-13 06:44:03,470 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-10-13 06:44:03,471 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-10-13 06:44:03,472 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-10-13 06:44:03,473 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-10-13 06:44:03,474 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-10-13 06:44:03,474 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-10-13 06:44:03,482 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-10-13 06:44:03,484 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-10-13 06:44:03,486 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-10-13 06:44:03,487 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-10-13 06:44:03,487 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-10-13 06:44:03,488 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-10-13 06:44:03,488 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-10-13 06:44:03,489 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-10-13 06:44:03,490 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-10-13 06:44:03,491 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-10-13 06:44:03,491 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-10-13 06:44:03,539 INFO L113 SettingsManager]: Loading preferences was successful [2021-10-13 06:44:03,539 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-10-13 06:44:03,540 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-10-13 06:44:03,540 INFO L138 SettingsManager]: * User list type=DISABLED [2021-10-13 06:44:03,541 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-10-13 06:44:03,541 INFO L138 SettingsManager]: * Explicit value domain=true [2021-10-13 06:44:03,541 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-10-13 06:44:03,541 INFO L138 SettingsManager]: * Octagon Domain=false [2021-10-13 06:44:03,541 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-10-13 06:44:03,542 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-10-13 06:44:03,542 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-10-13 06:44:03,543 INFO L138 SettingsManager]: * Interval Domain=false [2021-10-13 06:44:03,543 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-10-13 06:44:03,543 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-10-13 06:44:03,543 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2021-10-13 06:44:03,544 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-10-13 06:44:03,544 INFO L138 SettingsManager]: * sizeof long=4 [2021-10-13 06:44:03,544 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-10-13 06:44:03,545 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-10-13 06:44:03,545 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-10-13 06:44:03,545 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-10-13 06:44:03,545 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-10-13 06:44:03,545 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-10-13 06:44:03,546 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-10-13 06:44:03,546 INFO L138 SettingsManager]: * sizeof long double=12 [2021-10-13 06:44:03,546 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-10-13 06:44:03,546 INFO L138 SettingsManager]: * Use constant arrays=true [2021-10-13 06:44:03,547 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-10-13 06:44:03,547 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-10-13 06:44:03,548 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-10-13 06:44:03,548 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-10-13 06:44:03,549 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-10-13 06:44:03,549 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-10-13 06:44:03,549 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-10-13 06:44:03,549 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-10-13 06:44:03,549 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-10-13 06:44:03,550 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-10-13 06:44:03,550 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-10-13 06:44:03,550 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-10-13 06:44:03,550 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_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> f684876205455ff045e7b27eb3c5cbf35fa59fa1 [2021-10-13 06:44:03,844 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-10-13 06:44:03,869 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-10-13 06:44:03,872 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-10-13 06:44:03,875 INFO L271 PluginConnector]: Initializing CDTParser... [2021-10-13 06:44:03,876 INFO L275 PluginConnector]: CDTParser initialized [2021-10-13 06:44:03,876 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/../../sv-benchmarks/c/recursive-simple/fibo_2calls_4-2.c [2021-10-13 06:44:03,957 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/data/3d36e579a/0955a347931e4bf68ad834bf7d725416/FLAG480dd04e8 [2021-10-13 06:44:04,485 INFO L306 CDTParser]: Found 1 translation units. [2021-10-13 06:44:04,486 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/sv-benchmarks/c/recursive-simple/fibo_2calls_4-2.c [2021-10-13 06:44:04,492 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/data/3d36e579a/0955a347931e4bf68ad834bf7d725416/FLAG480dd04e8 [2021-10-13 06:44:04,845 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/data/3d36e579a/0955a347931e4bf68ad834bf7d725416 [2021-10-13 06:44:04,850 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-10-13 06:44:04,852 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-10-13 06:44:04,855 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-10-13 06:44:04,855 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-10-13 06:44:04,862 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-10-13 06:44:04,863 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.10 06:44:04" (1/1) ... [2021-10-13 06:44:04,865 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@394da7e4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 06:44:04, skipping insertion in model container [2021-10-13 06:44:04,865 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.10 06:44:04" (1/1) ... [2021-10-13 06:44:04,874 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-10-13 06:44:04,886 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-10-13 06:44:05,021 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/sv-benchmarks/c/recursive-simple/fibo_2calls_4-2.c[946,959] [2021-10-13 06:44:05,024 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-10-13 06:44:05,033 INFO L203 MainTranslator]: Completed pre-run [2021-10-13 06:44:05,050 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/sv-benchmarks/c/recursive-simple/fibo_2calls_4-2.c[946,959] [2021-10-13 06:44:05,051 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-10-13 06:44:05,064 INFO L208 MainTranslator]: Completed translation [2021-10-13 06:44:05,065 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 06:44:05 WrapperNode [2021-10-13 06:44:05,065 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-10-13 06:44:05,066 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-10-13 06:44:05,066 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-10-13 06:44:05,067 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-10-13 06:44:05,075 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 06:44:05" (1/1) ... [2021-10-13 06:44:05,082 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 06:44:05" (1/1) ... [2021-10-13 06:44:05,097 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-10-13 06:44:05,098 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-10-13 06:44:05,099 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-10-13 06:44:05,099 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-10-13 06:44:05,107 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 06:44:05" (1/1) ... [2021-10-13 06:44:05,107 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 06:44:05" (1/1) ... [2021-10-13 06:44:05,108 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 06:44:05" (1/1) ... [2021-10-13 06:44:05,109 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 06:44:05" (1/1) ... [2021-10-13 06:44:05,112 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 06:44:05" (1/1) ... [2021-10-13 06:44:05,114 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 06:44:05" (1/1) ... [2021-10-13 06:44:05,116 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 06:44:05" (1/1) ... [2021-10-13 06:44:05,117 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-10-13 06:44:05,118 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-10-13 06:44:05,119 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-10-13 06:44:05,119 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-10-13 06:44:05,120 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 06:44:05" (1/1) ... [2021-10-13 06:44:05,127 INFO L170 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-10-13 06:44:05,139 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/z3 [2021-10-13 06:44:05,167 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-10-13 06:44:05,187 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-10-13 06:44:05,213 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-10-13 06:44:05,214 INFO L130 BoogieDeclarations]: Found specification of procedure fibo2 [2021-10-13 06:44:05,215 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo2 [2021-10-13 06:44:05,215 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-10-13 06:44:05,215 INFO L130 BoogieDeclarations]: Found specification of procedure fibo1 [2021-10-13 06:44:05,215 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo1 [2021-10-13 06:44:05,216 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-10-13 06:44:05,216 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-10-13 06:44:05,526 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-10-13 06:44:05,527 INFO L299 CfgBuilder]: Removed 4 assume(true) statements. [2021-10-13 06:44:05,529 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.10 06:44:05 BoogieIcfgContainer [2021-10-13 06:44:05,529 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-10-13 06:44:05,531 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-10-13 06:44:05,531 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-10-13 06:44:05,548 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-10-13 06:44:05,548 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 13.10 06:44:04" (1/3) ... [2021-10-13 06:44:05,549 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4e143388 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.10 06:44:05, skipping insertion in model container [2021-10-13 06:44:05,549 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 06:44:05" (2/3) ... [2021-10-13 06:44:05,549 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4e143388 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.10 06:44:05, skipping insertion in model container [2021-10-13 06:44:05,550 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.10 06:44:05" (3/3) ... [2021-10-13 06:44:05,551 INFO L111 eAbstractionObserver]: Analyzing ICFG fibo_2calls_4-2.c [2021-10-13 06:44:05,556 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-10-13 06:44:05,556 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-10-13 06:44:05,637 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-10-13 06:44:05,646 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, mConcurrency=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 [2021-10-13 06:44:05,646 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-10-13 06:44:05,689 INFO L276 IsEmpty]: Start isEmpty. Operand has 26 states, 17 states have (on average 1.3529411764705883) internal successors, (23), 18 states have internal predecessors, (23), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-10-13 06:44:05,695 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-10-13 06:44:05,695 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 06:44:05,696 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 06:44:05,696 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-13 06:44:05,703 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 06:44:05,703 INFO L82 PathProgramCache]: Analyzing trace with hash 2097990987, now seen corresponding path program 1 times [2021-10-13 06:44:05,712 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-13 06:44:05,713 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1346734261] [2021-10-13 06:44:05,713 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 06:44:05,714 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 06:44:05,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 06:44:05,964 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 06:44:05,964 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-13 06:44:05,965 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1346734261] [2021-10-13 06:44:05,966 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1346734261] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-13 06:44:05,966 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-13 06:44:05,966 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-10-13 06:44:05,974 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [984921984] [2021-10-13 06:44:05,979 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-10-13 06:44:05,979 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-13 06:44:05,995 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-10-13 06:44:05,998 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-10-13 06:44:06,000 INFO L87 Difference]: Start difference. First operand has 26 states, 17 states have (on average 1.3529411764705883) internal successors, (23), 18 states have internal predecessors, (23), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Second operand has 5 states, 5 states have (on average 1.4) internal successors, (7), 4 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-13 06:44:06,057 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 06:44:06,058 INFO L93 Difference]: Finished difference Result 36 states and 44 transitions. [2021-10-13 06:44:06,058 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-10-13 06:44:06,061 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.4) internal successors, (7), 4 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 9 [2021-10-13 06:44:06,061 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 06:44:06,070 INFO L225 Difference]: With dead ends: 36 [2021-10-13 06:44:06,070 INFO L226 Difference]: Without dead ends: 26 [2021-10-13 06:44:06,073 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 25.6ms TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-10-13 06:44:06,090 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2021-10-13 06:44:06,117 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2021-10-13 06:44:06,119 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 17 states have (on average 1.2352941176470589) internal successors, (21), 18 states have internal predecessors, (21), 5 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2021-10-13 06:44:06,122 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 33 transitions. [2021-10-13 06:44:06,123 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 33 transitions. Word has length 9 [2021-10-13 06:44:06,124 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 06:44:06,124 INFO L470 AbstractCegarLoop]: Abstraction has 26 states and 33 transitions. [2021-10-13 06:44:06,124 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.4) internal successors, (7), 4 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-13 06:44:06,125 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 33 transitions. [2021-10-13 06:44:06,126 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-10-13 06:44:06,126 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 06:44:06,127 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 06:44:06,128 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-10-13 06:44:06,128 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-13 06:44:06,131 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 06:44:06,132 INFO L82 PathProgramCache]: Analyzing trace with hash 1328370967, now seen corresponding path program 1 times [2021-10-13 06:44:06,132 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-13 06:44:06,132 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [839782189] [2021-10-13 06:44:06,133 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 06:44:06,133 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 06:44:06,163 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 06:44:06,219 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 06:44:06,220 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-13 06:44:06,220 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [839782189] [2021-10-13 06:44:06,220 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [839782189] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-13 06:44:06,221 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-13 06:44:06,221 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-10-13 06:44:06,221 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1906254939] [2021-10-13 06:44:06,223 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-10-13 06:44:06,223 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-13 06:44:06,224 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-10-13 06:44:06,225 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-10-13 06:44:06,226 INFO L87 Difference]: Start difference. First operand 26 states and 33 transitions. Second operand has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-13 06:44:06,256 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 06:44:06,256 INFO L93 Difference]: Finished difference Result 32 states and 40 transitions. [2021-10-13 06:44:06,257 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-10-13 06:44:06,257 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 10 [2021-10-13 06:44:06,258 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 06:44:06,260 INFO L225 Difference]: With dead ends: 32 [2021-10-13 06:44:06,261 INFO L226 Difference]: Without dead ends: 28 [2021-10-13 06:44:06,262 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 13.2ms TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-10-13 06:44:06,262 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2021-10-13 06:44:06,270 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 26. [2021-10-13 06:44:06,271 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 17 states have (on average 1.2352941176470589) internal successors, (21), 18 states have internal predecessors, (21), 5 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2021-10-13 06:44:06,274 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 33 transitions. [2021-10-13 06:44:06,275 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 33 transitions. Word has length 10 [2021-10-13 06:44:06,275 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 06:44:06,275 INFO L470 AbstractCegarLoop]: Abstraction has 26 states and 33 transitions. [2021-10-13 06:44:06,276 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-13 06:44:06,276 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 33 transitions. [2021-10-13 06:44:06,278 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-10-13 06:44:06,279 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 06:44:06,279 INFO L512 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 06:44:06,280 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-10-13 06:44:06,284 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-13 06:44:06,293 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 06:44:06,294 INFO L82 PathProgramCache]: Analyzing trace with hash -1296553538, now seen corresponding path program 1 times [2021-10-13 06:44:06,294 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-13 06:44:06,294 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1152287919] [2021-10-13 06:44:06,295 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 06:44:06,295 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 06:44:06,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 06:44:06,364 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-13 06:44:06,365 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-13 06:44:06,365 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1152287919] [2021-10-13 06:44:06,365 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1152287919] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-13 06:44:06,365 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [103960292] [2021-10-13 06:44:06,366 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 06:44:06,366 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 06:44:06,366 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/z3 [2021-10-13 06:44:06,368 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 06:44:06,391 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-10-13 06:44:06,439 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 06:44:06,440 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 6 conjunts are in the unsatisfiable core [2021-10-13 06:44:06,446 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 06:44:06,607 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-13 06:44:06,607 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 06:44:06,843 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-13 06:44:06,844 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [103960292] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 06:44:06,844 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1020192433] [2021-10-13 06:44:06,865 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-10-13 06:44:06,865 INFO L166 IcfgInterpreter]: Building call graph [2021-10-13 06:44:06,870 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-10-13 06:44:06,875 INFO L176 IcfgInterpreter]: Starting interpretation [2021-10-13 06:44:06,876 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-10-13 06:44:06,907 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-13 06:44:06,913 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-10-13 06:44:06,914 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-13 06:44:06,915 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 49 [2021-10-13 06:44:06,916 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-10-13 06:44:06,916 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-13 06:44:06,917 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 12 [2021-10-13 06:44:06,919 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 122 [2021-10-13 06:44:06,949 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-13 06:44:06,950 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-13 06:44:06,951 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-13 06:44:06,958 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 9 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 16 [2021-10-13 06:44:06,959 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-13 06:44:06,960 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-10-13 06:44:06,961 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-13 06:44:06,961 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-10-13 06:44:06,961 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-10-13 06:44:06,963 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-13 06:44:06,982 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-10-13 06:44:06,984 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-13 06:44:06,986 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 122 [2021-10-13 06:44:06,987 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-10-13 06:44:06,987 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:119, output treesize:122 [2021-10-13 06:44:07,025 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2021-10-13 06:44:07,201 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 06:44:07,202 FATAL L? ?]: The Plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction has thrown an exception: java.lang.AssertionError: No corresponding IProgramVar for |v_#valid_10| at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.TermVarsProc.computeTermVarsProc(TermVarsProc.java:97) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.TermVarsProc.computeTermVarsProc(TermVarsProc.java:83) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.BasicPredicateFactory.constructTermVarsProc(BasicPredicateFactory.java:92) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.BasicPredicateFactory.newPredicate(BasicPredicateFactory.java:81) at de.uni_freiburg.informatik.ultimate.lib.sifa.SymbolicTools.predicate(SymbolicTools.java:174) at de.uni_freiburg.informatik.ultimate.lib.sifa.SymbolicTools.post(SymbolicTools.java:116) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.ipretInternal(DagInterpreter.java:227) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.ipretTransAndStoreLoiPred(DagInterpreter.java:209) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.ipretTrans(DagInterpreter.java:187) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.ipretNode(DagInterpreter.java:165) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.interpret(DagInterpreter.java:123) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.interpretLoisInProcedure(IcfgInterpreter.java:136) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.interpret(IcfgInterpreter.java:127) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:102) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:608) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:53) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:392) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-10-13 06:44:07,206 INFO L168 Benchmark]: Toolchain (without parser) took 2353.09 ms. Allocated memory is still 100.7 MB. Free memory was 77.2 MB in the beginning and 52.4 MB in the end (delta: 24.8 MB). Peak memory consumption was 28.4 MB. Max. memory is 16.1 GB. [2021-10-13 06:44:07,207 INFO L168 Benchmark]: CDTParser took 0.25 ms. Allocated memory is still 83.9 MB. Free memory is still 54.5 MB. There was no memory consumed. Max. memory is 16.1 GB. [2021-10-13 06:44:07,207 INFO L168 Benchmark]: CACSL2BoogieTranslator took 210.64 ms. Allocated memory is still 100.7 MB. Free memory was 76.9 MB in the beginning and 67.3 MB in the end (delta: 9.7 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. [2021-10-13 06:44:07,208 INFO L168 Benchmark]: Boogie Procedure Inliner took 31.38 ms. Allocated memory is still 100.7 MB. Free memory was 67.3 MB in the beginning and 66.0 MB in the end (delta: 1.3 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2021-10-13 06:44:07,208 INFO L168 Benchmark]: Boogie Preprocessor took 19.24 ms. Allocated memory is still 100.7 MB. Free memory was 66.0 MB in the beginning and 64.9 MB in the end (delta: 1.0 MB). There was no memory consumed. Max. memory is 16.1 GB. [2021-10-13 06:44:07,209 INFO L168 Benchmark]: RCFGBuilder took 411.08 ms. Allocated memory is still 100.7 MB. Free memory was 64.9 MB in the beginning and 54.5 MB in the end (delta: 10.4 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. [2021-10-13 06:44:07,210 INFO L168 Benchmark]: TraceAbstraction took 1673.70 ms. Allocated memory is still 100.7 MB. Free memory was 54.1 MB in the beginning and 52.4 MB in the end (delta: 1.7 MB). Peak memory consumption was 5.3 MB. Max. memory is 16.1 GB. [2021-10-13 06:44:07,213 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.25 ms. Allocated memory is still 83.9 MB. Free memory is still 54.5 MB. There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 210.64 ms. Allocated memory is still 100.7 MB. Free memory was 76.9 MB in the beginning and 67.3 MB in the end (delta: 9.7 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 31.38 ms. Allocated memory is still 100.7 MB. Free memory was 67.3 MB in the beginning and 66.0 MB in the end (delta: 1.3 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Boogie Preprocessor took 19.24 ms. Allocated memory is still 100.7 MB. Free memory was 66.0 MB in the beginning and 64.9 MB in the end (delta: 1.0 MB). There was no memory consumed. Max. memory is 16.1 GB. * RCFGBuilder took 411.08 ms. Allocated memory is still 100.7 MB. Free memory was 64.9 MB in the beginning and 54.5 MB in the end (delta: 10.4 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. * TraceAbstraction took 1673.70 ms. Allocated memory is still 100.7 MB. Free memory was 54.1 MB in the beginning and 52.4 MB in the end (delta: 1.7 MB). Peak memory consumption was 5.3 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - ExceptionOrErrorResult: AssertionError: No corresponding IProgramVar for |v_#valid_10| de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: AssertionError: No corresponding IProgramVar for |v_#valid_10|: de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.TermVarsProc.computeTermVarsProc(TermVarsProc.java:97) RESULT: Ultimate could not prove your program: Toolchain returned no result. [2021-10-13 06:44:07,259 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 0 Received shutdown request... ### Bit-precise run ### This is Ultimate 0.2.1-dev-4e77c04 [2021-10-13 06:44:09,716 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-10-13 06:44:09,718 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-10-13 06:44:09,766 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-10-13 06:44:09,766 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-10-13 06:44:09,768 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-10-13 06:44:09,769 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-10-13 06:44:09,772 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-10-13 06:44:09,774 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-10-13 06:44:09,775 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-10-13 06:44:09,776 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-10-13 06:44:09,778 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-10-13 06:44:09,779 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-10-13 06:44:09,780 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-10-13 06:44:09,781 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-10-13 06:44:09,783 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-10-13 06:44:09,784 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-10-13 06:44:09,785 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-10-13 06:44:09,787 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-10-13 06:44:09,789 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-10-13 06:44:09,791 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-10-13 06:44:09,793 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-10-13 06:44:09,794 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-10-13 06:44:09,795 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-10-13 06:44:09,799 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-10-13 06:44:09,799 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-10-13 06:44:09,800 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-10-13 06:44:09,801 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-10-13 06:44:09,802 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-10-13 06:44:09,803 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-10-13 06:44:09,803 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-10-13 06:44:09,804 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-10-13 06:44:09,805 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-10-13 06:44:09,806 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-10-13 06:44:09,807 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-10-13 06:44:09,808 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-10-13 06:44:09,808 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-10-13 06:44:09,809 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-10-13 06:44:09,809 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-10-13 06:44:09,810 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-10-13 06:44:09,811 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-10-13 06:44:09,812 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/config/svcomp-Reach-32bit-Taipan_Bitvector.epf [2021-10-13 06:44:09,839 INFO L113 SettingsManager]: Loading preferences was successful [2021-10-13 06:44:09,840 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-10-13 06:44:09,841 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-10-13 06:44:09,841 INFO L138 SettingsManager]: * User list type=DISABLED [2021-10-13 06:44:09,841 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-10-13 06:44:09,841 INFO L138 SettingsManager]: * Explicit value domain=true [2021-10-13 06:44:09,842 INFO L138 SettingsManager]: * Octagon Domain=false [2021-10-13 06:44:09,842 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-10-13 06:44:09,842 INFO L138 SettingsManager]: * Interval Domain=false [2021-10-13 06:44:09,843 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-10-13 06:44:09,843 INFO L138 SettingsManager]: * sizeof long=4 [2021-10-13 06:44:09,843 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-10-13 06:44:09,843 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-10-13 06:44:09,844 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-10-13 06:44:09,844 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-10-13 06:44:09,844 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-10-13 06:44:09,844 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-10-13 06:44:09,844 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-10-13 06:44:09,844 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-10-13 06:44:09,845 INFO L138 SettingsManager]: * sizeof long double=12 [2021-10-13 06:44:09,845 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-10-13 06:44:09,845 INFO L138 SettingsManager]: * Use constant arrays=true [2021-10-13 06:44:09,845 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-10-13 06:44:09,845 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-10-13 06:44:09,846 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-10-13 06:44:09,846 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-10-13 06:44:09,846 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-10-13 06:44:09,846 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-10-13 06:44:09,846 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-10-13 06:44:09,847 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-10-13 06:44:09,847 INFO L138 SettingsManager]: * Trace refinement strategy=WALRUS [2021-10-13 06:44:09,847 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-10-13 06:44:09,847 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-10-13 06:44:09,847 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-10-13 06:44:09,848 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-10-13 06:44:09,848 INFO L138 SettingsManager]: * Logic for external solver=AUFBV 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_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> f684876205455ff045e7b27eb3c5cbf35fa59fa1 [2021-10-13 06:44:10,168 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-10-13 06:44:10,188 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-10-13 06:44:10,190 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-10-13 06:44:10,191 INFO L271 PluginConnector]: Initializing CDTParser... [2021-10-13 06:44:10,192 INFO L275 PluginConnector]: CDTParser initialized [2021-10-13 06:44:10,193 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/../../sv-benchmarks/c/recursive-simple/fibo_2calls_4-2.c [2021-10-13 06:44:10,264 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/data/e06b3451e/303c434824934d1eb5fa2d5cdb0a1dc4/FLAGe88008d78 [2021-10-13 06:44:10,766 INFO L306 CDTParser]: Found 1 translation units. [2021-10-13 06:44:10,767 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/sv-benchmarks/c/recursive-simple/fibo_2calls_4-2.c [2021-10-13 06:44:10,796 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/data/e06b3451e/303c434824934d1eb5fa2d5cdb0a1dc4/FLAGe88008d78 [2021-10-13 06:44:11,147 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/data/e06b3451e/303c434824934d1eb5fa2d5cdb0a1dc4 [2021-10-13 06:44:11,150 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-10-13 06:44:11,151 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-10-13 06:44:11,152 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-10-13 06:44:11,153 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-10-13 06:44:11,159 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-10-13 06:44:11,161 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.10 06:44:11" (1/1) ... [2021-10-13 06:44:11,163 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@29421e94 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 06:44:11, skipping insertion in model container [2021-10-13 06:44:11,163 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.10 06:44:11" (1/1) ... [2021-10-13 06:44:11,171 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-10-13 06:44:11,187 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-10-13 06:44:11,332 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/sv-benchmarks/c/recursive-simple/fibo_2calls_4-2.c[946,959] [2021-10-13 06:44:11,336 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-10-13 06:44:11,348 INFO L203 MainTranslator]: Completed pre-run [2021-10-13 06:44:11,410 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/sv-benchmarks/c/recursive-simple/fibo_2calls_4-2.c[946,959] [2021-10-13 06:44:11,411 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-10-13 06:44:11,427 INFO L208 MainTranslator]: Completed translation [2021-10-13 06:44:11,428 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 06:44:11 WrapperNode [2021-10-13 06:44:11,428 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-10-13 06:44:11,430 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-10-13 06:44:11,430 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-10-13 06:44:11,430 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-10-13 06:44:11,437 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 06:44:11" (1/1) ... [2021-10-13 06:44:11,445 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 06:44:11" (1/1) ... [2021-10-13 06:44:11,460 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-10-13 06:44:11,461 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-10-13 06:44:11,461 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-10-13 06:44:11,462 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-10-13 06:44:11,469 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 06:44:11" (1/1) ... [2021-10-13 06:44:11,470 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 06:44:11" (1/1) ... [2021-10-13 06:44:11,472 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 06:44:11" (1/1) ... [2021-10-13 06:44:11,472 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 06:44:11" (1/1) ... [2021-10-13 06:44:11,478 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 06:44:11" (1/1) ... [2021-10-13 06:44:11,480 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 06:44:11" (1/1) ... [2021-10-13 06:44:11,481 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 06:44:11" (1/1) ... [2021-10-13 06:44:11,483 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-10-13 06:44:11,484 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-10-13 06:44:11,484 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-10-13 06:44:11,484 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-10-13 06:44:11,485 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 06:44:11" (1/1) ... [2021-10-13 06:44:11,492 INFO L170 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-10-13 06:44:11,504 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/z3 [2021-10-13 06:44:11,518 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-10-13 06:44:11,533 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-10-13 06:44:11,580 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2021-10-13 06:44:11,581 INFO L130 BoogieDeclarations]: Found specification of procedure fibo2 [2021-10-13 06:44:11,581 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo2 [2021-10-13 06:44:11,581 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-10-13 06:44:11,581 INFO L130 BoogieDeclarations]: Found specification of procedure fibo1 [2021-10-13 06:44:11,581 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo1 [2021-10-13 06:44:11,583 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-10-13 06:44:11,583 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-10-13 06:44:11,872 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-10-13 06:44:11,872 INFO L299 CfgBuilder]: Removed 4 assume(true) statements. [2021-10-13 06:44:11,874 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.10 06:44:11 BoogieIcfgContainer [2021-10-13 06:44:11,874 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-10-13 06:44:11,876 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-10-13 06:44:11,876 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-10-13 06:44:11,879 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-10-13 06:44:11,879 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 13.10 06:44:11" (1/3) ... [2021-10-13 06:44:11,880 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@419db78f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.10 06:44:11, skipping insertion in model container [2021-10-13 06:44:11,880 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 06:44:11" (2/3) ... [2021-10-13 06:44:11,880 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@419db78f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.10 06:44:11, skipping insertion in model container [2021-10-13 06:44:11,881 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.10 06:44:11" (3/3) ... [2021-10-13 06:44:11,882 INFO L111 eAbstractionObserver]: Analyzing ICFG fibo_2calls_4-2.c [2021-10-13 06:44:11,888 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-10-13 06:44:11,888 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-10-13 06:44:11,935 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-10-13 06:44:11,942 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, mConcurrency=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 [2021-10-13 06:44:11,942 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-10-13 06:44:11,958 INFO L276 IsEmpty]: Start isEmpty. Operand has 27 states, 18 states have (on average 1.3333333333333333) internal successors, (24), 19 states have internal predecessors, (24), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-10-13 06:44:11,963 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-10-13 06:44:11,963 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 06:44:11,963 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 06:44:11,964 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-13 06:44:11,969 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 06:44:11,970 INFO L82 PathProgramCache]: Analyzing trace with hash 1014607960, now seen corresponding path program 1 times [2021-10-13 06:44:11,982 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-13 06:44:11,997 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [518916108] [2021-10-13 06:44:11,997 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 06:44:11,998 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 06:44:11,999 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/mathsat [2021-10-13 06:44:12,009 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 06:44:12,040 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-10-13 06:44:12,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 06:44:12,089 INFO L263 TraceCheckSpWp]: Trace formula consists of 33 conjuncts, 4 conjunts are in the unsatisfiable core [2021-10-13 06:44:12,094 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 06:44:12,269 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 06:44:12,269 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 06:44:12,422 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 06:44:12,422 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-13 06:44:12,423 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [518916108] [2021-10-13 06:44:12,424 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [518916108] provided 2 perfect and 0 imperfect interpolant sequences [2021-10-13 06:44:12,424 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-10-13 06:44:12,425 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [] total 7 [2021-10-13 06:44:12,427 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [677527147] [2021-10-13 06:44:12,432 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-10-13 06:44:12,434 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-13 06:44:12,453 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-10-13 06:44:12,454 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-10-13 06:44:12,456 INFO L87 Difference]: Start difference. First operand has 27 states, 18 states have (on average 1.3333333333333333) internal successors, (24), 19 states have internal predecessors, (24), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Second operand has 7 states, 5 states have (on average 2.2) internal successors, (11), 7 states have internal predecessors, (11), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-10-13 06:44:12,583 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 06:44:12,584 INFO L93 Difference]: Finished difference Result 37 states and 46 transitions. [2021-10-13 06:44:12,585 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-10-13 06:44:12,587 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 5 states have (on average 2.2) internal successors, (11), 7 states have internal predecessors, (11), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 10 [2021-10-13 06:44:12,588 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 06:44:12,596 INFO L225 Difference]: With dead ends: 37 [2021-10-13 06:44:12,596 INFO L226 Difference]: Without dead ends: 25 [2021-10-13 06:44:12,599 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 68.2ms TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2021-10-13 06:44:12,615 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2021-10-13 06:44:12,636 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2021-10-13 06:44:12,638 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 16 states have (on average 1.25) internal successors, (20), 17 states have internal predecessors, (20), 5 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2021-10-13 06:44:12,639 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 32 transitions. [2021-10-13 06:44:12,641 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 32 transitions. Word has length 10 [2021-10-13 06:44:12,641 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 06:44:12,641 INFO L470 AbstractCegarLoop]: Abstraction has 25 states and 32 transitions. [2021-10-13 06:44:12,642 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 5 states have (on average 2.2) internal successors, (11), 7 states have internal predecessors, (11), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-10-13 06:44:12,642 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 32 transitions. [2021-10-13 06:44:12,643 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-10-13 06:44:12,643 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 06:44:12,644 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 06:44:12,658 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2021-10-13 06:44:12,857 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 [2021-10-13 06:44:12,858 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-13 06:44:12,859 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 06:44:12,859 INFO L82 PathProgramCache]: Analyzing trace with hash 2131805067, now seen corresponding path program 1 times [2021-10-13 06:44:12,859 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-13 06:44:12,860 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1246017966] [2021-10-13 06:44:12,860 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 06:44:12,860 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 06:44:12,860 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/mathsat [2021-10-13 06:44:12,861 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 06:44:12,865 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-10-13 06:44:12,901 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 06:44:12,902 INFO L263 TraceCheckSpWp]: Trace formula consists of 34 conjuncts, 4 conjunts are in the unsatisfiable core [2021-10-13 06:44:12,904 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 06:44:12,980 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 06:44:12,980 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 06:44:13,168 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 06:44:13,168 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-13 06:44:13,168 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1246017966] [2021-10-13 06:44:13,168 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1246017966] provided 2 perfect and 0 imperfect interpolant sequences [2021-10-13 06:44:13,169 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-10-13 06:44:13,169 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [] total 7 [2021-10-13 06:44:13,169 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [611428116] [2021-10-13 06:44:13,170 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-10-13 06:44:13,170 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-13 06:44:13,171 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-10-13 06:44:13,171 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-10-13 06:44:13,172 INFO L87 Difference]: Start difference. First operand 25 states and 32 transitions. Second operand has 7 states, 5 states have (on average 2.6) internal successors, (13), 7 states have internal predecessors, (13), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-10-13 06:44:13,265 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 06:44:13,265 INFO L93 Difference]: Finished difference Result 31 states and 39 transitions. [2021-10-13 06:44:13,266 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-10-13 06:44:13,266 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 5 states have (on average 2.6) internal successors, (13), 7 states have internal predecessors, (13), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 11 [2021-10-13 06:44:13,267 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 06:44:13,268 INFO L225 Difference]: With dead ends: 31 [2021-10-13 06:44:13,268 INFO L226 Difference]: Without dead ends: 27 [2021-10-13 06:44:13,269 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 46.6ms TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2021-10-13 06:44:13,269 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-10-13 06:44:13,274 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 25. [2021-10-13 06:44:13,275 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 16 states have (on average 1.25) internal successors, (20), 17 states have internal predecessors, (20), 5 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2021-10-13 06:44:13,276 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 32 transitions. [2021-10-13 06:44:13,276 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 32 transitions. Word has length 11 [2021-10-13 06:44:13,277 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 06:44:13,277 INFO L470 AbstractCegarLoop]: Abstraction has 25 states and 32 transitions. [2021-10-13 06:44:13,277 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 5 states have (on average 2.6) internal successors, (13), 7 states have internal predecessors, (13), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-10-13 06:44:13,277 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 32 transitions. [2021-10-13 06:44:13,279 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-10-13 06:44:13,279 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 06:44:13,279 INFO L512 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 06:44:13,313 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (3)] Forceful destruction successful, exit code 0 [2021-10-13 06:44:13,493 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 [2021-10-13 06:44:13,493 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-13 06:44:13,494 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 06:44:13,494 INFO L82 PathProgramCache]: Analyzing trace with hash -1494555912, now seen corresponding path program 1 times [2021-10-13 06:44:13,495 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-13 06:44:13,495 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [367045655] [2021-10-13 06:44:13,495 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 06:44:13,496 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 06:44:13,496 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/mathsat [2021-10-13 06:44:13,500 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 06:44:13,501 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-10-13 06:44:13,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 06:44:13,583 INFO L263 TraceCheckSpWp]: Trace formula consists of 50 conjuncts, 6 conjunts are in the unsatisfiable core [2021-10-13 06:44:13,585 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 06:44:13,761 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-13 06:44:13,769 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 06:44:14,211 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-13 06:44:14,212 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-13 06:44:14,212 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [367045655] [2021-10-13 06:44:14,213 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [367045655] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 06:44:14,213 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [928032916] [2021-10-13 06:44:14,214 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 06:44:14,214 INFO L170 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-10-13 06:44:14,215 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/cvc4 [2021-10-13 06:44:14,221 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-10-13 06:44:14,241 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (5)] Waiting until timeout for monitored process [2021-10-13 06:44:14,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 06:44:14,370 INFO L263 TraceCheckSpWp]: Trace formula consists of 50 conjuncts, 8 conjunts are in the unsatisfiable core [2021-10-13 06:44:14,371 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 06:44:14,636 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-10-13 06:44:14,636 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 06:44:15,041 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-10-13 06:44:15,041 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [928032916] provided 2 perfect and 0 imperfect interpolant sequences [2021-10-13 06:44:15,042 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-10-13 06:44:15,042 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8, 9] imperfect sequences [7, 7] total 22 [2021-10-13 06:44:15,042 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1860923636] [2021-10-13 06:44:15,043 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-10-13 06:44:15,043 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-13 06:44:15,044 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-10-13 06:44:15,044 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=408, Unknown=0, NotChecked=0, Total=462 [2021-10-13 06:44:15,044 INFO L87 Difference]: Start difference. First operand 25 states and 32 transitions. Second operand has 14 states, 12 states have (on average 1.5833333333333333) internal successors, (19), 8 states have internal predecessors, (19), 3 states have call successors, (4), 1 states have call predecessors, (4), 4 states have return successors, (6), 6 states have call predecessors, (6), 3 states have call successors, (6) [2021-10-13 06:44:15,210 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 06:44:15,210 INFO L93 Difference]: Finished difference Result 48 states and 67 transitions. [2021-10-13 06:44:15,210 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-10-13 06:44:15,211 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 12 states have (on average 1.5833333333333333) internal successors, (19), 8 states have internal predecessors, (19), 3 states have call successors, (4), 1 states have call predecessors, (4), 4 states have return successors, (6), 6 states have call predecessors, (6), 3 states have call successors, (6) Word has length 22 [2021-10-13 06:44:15,211 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 06:44:15,213 INFO L225 Difference]: With dead ends: 48 [2021-10-13 06:44:15,213 INFO L226 Difference]: Without dead ends: 42 [2021-10-13 06:44:15,214 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 64 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 64 ImplicationChecksByTransitivity, 567.1ms TimeCoverageRelationStatistics Valid=66, Invalid=486, Unknown=0, NotChecked=0, Total=552 [2021-10-13 06:44:15,214 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2021-10-13 06:44:15,223 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 32. [2021-10-13 06:44:15,224 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 19 states have (on average 1.2105263157894737) internal successors, (23), 21 states have internal predecessors, (23), 7 states have call successors, (7), 2 states have call predecessors, (7), 5 states have return successors, (17), 8 states have call predecessors, (17), 7 states have call successors, (17) [2021-10-13 06:44:15,225 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 47 transitions. [2021-10-13 06:44:15,226 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 47 transitions. Word has length 22 [2021-10-13 06:44:15,226 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 06:44:15,226 INFO L470 AbstractCegarLoop]: Abstraction has 32 states and 47 transitions. [2021-10-13 06:44:15,227 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 12 states have (on average 1.5833333333333333) internal successors, (19), 8 states have internal predecessors, (19), 3 states have call successors, (4), 1 states have call predecessors, (4), 4 states have return successors, (6), 6 states have call predecessors, (6), 3 states have call successors, (6) [2021-10-13 06:44:15,227 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 47 transitions. [2021-10-13 06:44:15,228 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-10-13 06:44:15,228 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 06:44:15,229 INFO L512 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 06:44:15,242 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (5)] Forceful destruction successful, exit code 0 [2021-10-13 06:44:15,440 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2021-10-13 06:44:15,631 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 [2021-10-13 06:44:15,633 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-13 06:44:15,635 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 06:44:15,635 INFO L82 PathProgramCache]: Analyzing trace with hash -553851548, now seen corresponding path program 1 times [2021-10-13 06:44:15,637 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-13 06:44:15,638 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [600163284] [2021-10-13 06:44:15,639 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 06:44:15,639 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 06:44:15,640 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/mathsat [2021-10-13 06:44:15,646 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 06:44:15,650 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (6)] Waiting until timeout for monitored process [2021-10-13 06:44:15,742 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 06:44:15,743 INFO L263 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 6 conjunts are in the unsatisfiable core [2021-10-13 06:44:15,745 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 06:44:15,863 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-13 06:44:15,863 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 06:44:16,118 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-13 06:44:16,118 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-13 06:44:16,118 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [600163284] [2021-10-13 06:44:16,118 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [600163284] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 06:44:16,119 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [346014006] [2021-10-13 06:44:16,119 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 06:44:16,119 INFO L170 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-10-13 06:44:16,120 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/cvc4 [2021-10-13 06:44:16,121 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-10-13 06:44:16,155 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (7)] Waiting until timeout for monitored process [2021-10-13 06:44:16,273 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 06:44:16,275 INFO L263 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 6 conjunts are in the unsatisfiable core [2021-10-13 06:44:16,276 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 06:44:16,351 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-13 06:44:16,352 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 06:44:16,542 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-13 06:44:16,542 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [346014006] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 06:44:16,542 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1784331260] [2021-10-13 06:44:16,542 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 06:44:16,543 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 06:44:16,543 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/z3 [2021-10-13 06:44:16,545 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 06:44:16,572 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-10-13 06:44:16,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 06:44:16,684 INFO L263 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 6 conjunts are in the unsatisfiable core [2021-10-13 06:44:16,685 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 06:44:16,769 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-10-13 06:44:16,769 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 06:44:17,011 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-13 06:44:17,012 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1784331260] provided 2 perfect and 0 imperfect interpolant sequences [2021-10-13 06:44:17,012 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 4 imperfect interpolant sequences. [2021-10-13 06:44:17,012 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 7] imperfect sequences [7, 7, 7, 7] total 14 [2021-10-13 06:44:17,012 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1424875226] [2021-10-13 06:44:17,013 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-10-13 06:44:17,013 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-13 06:44:17,013 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-10-13 06:44:17,014 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2021-10-13 06:44:17,014 INFO L87 Difference]: Start difference. First operand 32 states and 47 transitions. Second operand has 9 states, 7 states have (on average 3.0) internal successors, (21), 7 states have internal predecessors, (21), 3 states have call successors, (4), 1 states have call predecessors, (4), 3 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2021-10-13 06:44:17,195 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 06:44:17,195 INFO L93 Difference]: Finished difference Result 78 states and 136 transitions. [2021-10-13 06:44:17,196 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-10-13 06:44:17,196 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 7 states have (on average 3.0) internal successors, (21), 7 states have internal predecessors, (21), 3 states have call successors, (4), 1 states have call predecessors, (4), 3 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) Word has length 24 [2021-10-13 06:44:17,197 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 06:44:17,199 INFO L225 Difference]: With dead ends: 78 [2021-10-13 06:44:17,199 INFO L226 Difference]: Without dead ends: 49 [2021-10-13 06:44:17,200 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 126 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 136.6ms TimeCoverageRelationStatistics Valid=50, Invalid=190, Unknown=0, NotChecked=0, Total=240 [2021-10-13 06:44:17,201 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2021-10-13 06:44:17,211 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 40. [2021-10-13 06:44:17,212 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 24 states have (on average 1.25) internal successors, (30), 26 states have internal predecessors, (30), 9 states have call successors, (9), 3 states have call predecessors, (9), 6 states have return successors, (19), 10 states have call predecessors, (19), 9 states have call successors, (19) [2021-10-13 06:44:17,213 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 58 transitions. [2021-10-13 06:44:17,214 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 58 transitions. Word has length 24 [2021-10-13 06:44:17,214 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 06:44:17,214 INFO L470 AbstractCegarLoop]: Abstraction has 40 states and 58 transitions. [2021-10-13 06:44:17,215 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 7 states have (on average 3.0) internal successors, (21), 7 states have internal predecessors, (21), 3 states have call successors, (4), 1 states have call predecessors, (4), 3 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2021-10-13 06:44:17,215 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 58 transitions. [2021-10-13 06:44:17,217 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-10-13 06:44:17,217 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 06:44:17,218 INFO L512 BasicCegarLoop]: trace histogram [3, 3, 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] [2021-10-13 06:44:17,225 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (7)] Forceful destruction successful, exit code 0 [2021-10-13 06:44:17,427 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (6)] Forceful destruction successful, exit code 0 [2021-10-13 06:44:17,641 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-10-13 06:44:17,824 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 06:44:17,824 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-13 06:44:17,825 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 06:44:17,825 INFO L82 PathProgramCache]: Analyzing trace with hash -650293480, now seen corresponding path program 1 times [2021-10-13 06:44:17,825 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-13 06:44:17,825 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [528885860] [2021-10-13 06:44:17,826 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 06:44:17,826 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 06:44:17,826 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/mathsat [2021-10-13 06:44:17,827 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 06:44:17,831 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (9)] Waiting until timeout for monitored process [2021-10-13 06:44:17,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 06:44:17,932 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 6 conjunts are in the unsatisfiable core [2021-10-13 06:44:17,934 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 06:44:18,056 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-10-13 06:44:18,056 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 06:44:18,383 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-10-13 06:44:18,383 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-13 06:44:18,383 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [528885860] [2021-10-13 06:44:18,383 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [528885860] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 06:44:18,383 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [445154424] [2021-10-13 06:44:18,384 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 06:44:18,384 INFO L170 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-10-13 06:44:18,384 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/cvc4 [2021-10-13 06:44:18,385 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-10-13 06:44:18,399 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (10)] Waiting until timeout for monitored process [2021-10-13 06:44:18,557 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 06:44:18,559 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 13 conjunts are in the unsatisfiable core [2021-10-13 06:44:18,561 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 06:44:18,811 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-10-13 06:44:18,811 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 06:44:19,282 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-10-13 06:44:19,283 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [445154424] provided 1 perfect and 1 imperfect interpolant sequences [2021-10-13 06:44:19,283 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 3 imperfect interpolant sequences. [2021-10-13 06:44:19,283 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [7, 7, 12] total 25 [2021-10-13 06:44:19,283 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [615525595] [2021-10-13 06:44:19,284 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-10-13 06:44:19,284 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-13 06:44:19,284 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-10-13 06:44:19,285 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=538, Unknown=0, NotChecked=0, Total=600 [2021-10-13 06:44:19,285 INFO L87 Difference]: Start difference. First operand 40 states and 58 transitions. Second operand has 10 states, 8 states have (on average 2.125) internal successors, (17), 5 states have internal predecessors, (17), 3 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (5), 5 states have call predecessors, (5), 3 states have call successors, (5) [2021-10-13 06:44:19,348 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 06:44:19,349 INFO L93 Difference]: Finished difference Result 62 states and 100 transitions. [2021-10-13 06:44:19,351 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-10-13 06:44:19,351 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 8 states have (on average 2.125) internal successors, (17), 5 states have internal predecessors, (17), 3 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (5), 5 states have call predecessors, (5), 3 states have call successors, (5) Word has length 34 [2021-10-13 06:44:19,352 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 06:44:19,353 INFO L225 Difference]: With dead ends: 62 [2021-10-13 06:44:19,354 INFO L226 Difference]: Without dead ends: 58 [2021-10-13 06:44:19,354 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 132 GetRequests, 109 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 88 ImplicationChecksByTransitivity, 448.0ms TimeCoverageRelationStatistics Valid=62, Invalid=538, Unknown=0, NotChecked=0, Total=600 [2021-10-13 06:44:19,355 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2021-10-13 06:44:19,378 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 48. [2021-10-13 06:44:19,379 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 28 states have (on average 1.2142857142857142) internal successors, (34), 30 states have internal predecessors, (34), 11 states have call successors, (11), 3 states have call predecessors, (11), 8 states have return successors, (33), 14 states have call predecessors, (33), 11 states have call successors, (33) [2021-10-13 06:44:19,385 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 78 transitions. [2021-10-13 06:44:19,388 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 78 transitions. Word has length 34 [2021-10-13 06:44:19,388 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 06:44:19,389 INFO L470 AbstractCegarLoop]: Abstraction has 48 states and 78 transitions. [2021-10-13 06:44:19,389 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 8 states have (on average 2.125) internal successors, (17), 5 states have internal predecessors, (17), 3 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (5), 5 states have call predecessors, (5), 3 states have call successors, (5) [2021-10-13 06:44:19,389 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 78 transitions. [2021-10-13 06:44:19,392 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-10-13 06:44:19,394 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 06:44:19,395 INFO L512 BasicCegarLoop]: trace histogram [3, 3, 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] [2021-10-13 06:44:19,413 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (9)] Forceful destruction successful, exit code 0 [2021-10-13 06:44:19,608 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (10)] Ended with exit code 0 [2021-10-13 06:44:19,807 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt [2021-10-13 06:44:19,807 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-13 06:44:19,807 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 06:44:19,808 INFO L82 PathProgramCache]: Analyzing trace with hash 159296083, now seen corresponding path program 1 times [2021-10-13 06:44:19,808 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-13 06:44:19,808 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1042985267] [2021-10-13 06:44:19,809 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 06:44:19,809 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 06:44:19,809 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/mathsat [2021-10-13 06:44:19,813 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 06:44:19,821 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (11)] Waiting until timeout for monitored process [2021-10-13 06:44:19,977 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 06:44:19,979 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 6 conjunts are in the unsatisfiable core [2021-10-13 06:44:19,981 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 06:44:20,121 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-10-13 06:44:20,121 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 06:44:20,444 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-10-13 06:44:20,444 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-13 06:44:20,444 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1042985267] [2021-10-13 06:44:20,444 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1042985267] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 06:44:20,444 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [41209606] [2021-10-13 06:44:20,444 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 06:44:20,445 INFO L170 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-10-13 06:44:20,445 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/cvc4 [2021-10-13 06:44:20,446 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-10-13 06:44:20,469 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (12)] Waiting until timeout for monitored process [2021-10-13 06:44:20,665 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 06:44:20,665 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 8 conjunts are in the unsatisfiable core [2021-10-13 06:44:20,667 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 06:44:20,824 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 8 proven. 3 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-10-13 06:44:20,824 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 06:44:21,223 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 8 proven. 5 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-10-13 06:44:21,224 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [41209606] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 06:44:21,224 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [934998685] [2021-10-13 06:44:21,224 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 06:44:21,225 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 06:44:21,225 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/z3 [2021-10-13 06:44:21,226 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 06:44:21,232 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-10-13 06:44:21,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 06:44:21,450 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 8 conjunts are in the unsatisfiable core [2021-10-13 06:44:21,452 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 06:44:21,562 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 8 proven. 3 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-10-13 06:44:21,563 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 06:44:21,871 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 8 proven. 5 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-10-13 06:44:21,872 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [934998685] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 06:44:21,872 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2021-10-13 06:44:21,872 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 8, 9, 8, 9] total 17 [2021-10-13 06:44:21,873 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1960750282] [2021-10-13 06:44:21,873 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-10-13 06:44:21,874 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-13 06:44:21,874 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-10-13 06:44:21,875 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2021-10-13 06:44:21,875 INFO L87 Difference]: Start difference. First operand 48 states and 78 transitions. Second operand has 17 states, 14 states have (on average 3.4285714285714284) internal successors, (48), 17 states have internal predecessors, (48), 10 states have call successors, (15), 1 states have call predecessors, (15), 6 states have return successors, (17), 9 states have call predecessors, (17), 10 states have call successors, (17) [2021-10-13 06:44:22,253 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 06:44:22,253 INFO L93 Difference]: Finished difference Result 110 states and 201 transitions. [2021-10-13 06:44:22,255 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-10-13 06:44:22,255 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 14 states have (on average 3.4285714285714284) internal successors, (48), 17 states have internal predecessors, (48), 10 states have call successors, (15), 1 states have call predecessors, (15), 6 states have return successors, (17), 9 states have call predecessors, (17), 10 states have call successors, (17) Word has length 35 [2021-10-13 06:44:22,255 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 06:44:22,257 INFO L225 Difference]: With dead ends: 110 [2021-10-13 06:44:22,257 INFO L226 Difference]: Without dead ends: 65 [2021-10-13 06:44:22,259 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 211 GetRequests, 191 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 282.0ms TimeCoverageRelationStatistics Valid=80, Invalid=382, Unknown=0, NotChecked=0, Total=462 [2021-10-13 06:44:22,260 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2021-10-13 06:44:22,276 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 56. [2021-10-13 06:44:22,276 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 33 states have (on average 1.1818181818181819) internal successors, (39), 36 states have internal predecessors, (39), 11 states have call successors, (11), 3 states have call predecessors, (11), 11 states have return successors, (42), 16 states have call predecessors, (42), 11 states have call successors, (42) [2021-10-13 06:44:22,278 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 92 transitions. [2021-10-13 06:44:22,281 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 92 transitions. Word has length 35 [2021-10-13 06:44:22,282 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 06:44:22,282 INFO L470 AbstractCegarLoop]: Abstraction has 56 states and 92 transitions. [2021-10-13 06:44:22,282 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 14 states have (on average 3.4285714285714284) internal successors, (48), 17 states have internal predecessors, (48), 10 states have call successors, (15), 1 states have call predecessors, (15), 6 states have return successors, (17), 9 states have call predecessors, (17), 10 states have call successors, (17) [2021-10-13 06:44:22,283 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 92 transitions. [2021-10-13 06:44:22,285 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-10-13 06:44:22,291 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 06:44:22,292 INFO L512 BasicCegarLoop]: trace histogram [3, 3, 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] [2021-10-13 06:44:22,323 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-10-13 06:44:22,499 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (11)] Forceful destruction successful, exit code 0 [2021-10-13 06:44:22,694 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (12)] Ended with exit code 0 [2021-10-13 06:44:22,893 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt [2021-10-13 06:44:22,893 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-13 06:44:22,893 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 06:44:22,893 INFO L82 PathProgramCache]: Analyzing trace with hash 186789494, now seen corresponding path program 1 times [2021-10-13 06:44:22,893 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-13 06:44:22,894 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1327007725] [2021-10-13 06:44:22,894 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 06:44:22,894 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 06:44:22,894 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/mathsat [2021-10-13 06:44:22,895 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 06:44:22,898 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (14)] Waiting until timeout for monitored process [2021-10-13 06:44:23,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 06:44:23,076 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 6 conjunts are in the unsatisfiable core [2021-10-13 06:44:23,078 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 06:44:23,209 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-10-13 06:44:23,209 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 06:44:23,431 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-10-13 06:44:23,431 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-13 06:44:23,432 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1327007725] [2021-10-13 06:44:23,432 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1327007725] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 06:44:23,432 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [496625703] [2021-10-13 06:44:23,432 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 06:44:23,432 INFO L170 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-10-13 06:44:23,432 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/cvc4 [2021-10-13 06:44:23,433 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-10-13 06:44:23,457 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (15)] Waiting until timeout for monitored process [2021-10-13 06:44:23,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 06:44:23,765 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 6 conjunts are in the unsatisfiable core [2021-10-13 06:44:23,766 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 06:44:23,857 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-10-13 06:44:23,857 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 06:44:24,071 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-10-13 06:44:24,071 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [496625703] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 06:44:24,071 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1135532277] [2021-10-13 06:44:24,071 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 06:44:24,071 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 06:44:24,072 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/z3 [2021-10-13 06:44:24,072 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 06:44:24,075 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-10-13 06:44:24,332 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 06:44:24,334 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 6 conjunts are in the unsatisfiable core [2021-10-13 06:44:24,336 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 06:44:24,457 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-10-13 06:44:24,457 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 06:44:24,663 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-10-13 06:44:24,663 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1135532277] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 06:44:24,663 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2021-10-13 06:44:24,664 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7, 7, 7, 7] total 10 [2021-10-13 06:44:24,664 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1058577687] [2021-10-13 06:44:24,665 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-10-13 06:44:24,665 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-13 06:44:24,666 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-10-13 06:44:24,666 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2021-10-13 06:44:24,666 INFO L87 Difference]: Start difference. First operand 56 states and 92 transitions. Second operand has 10 states, 8 states have (on average 3.625) internal successors, (29), 10 states have internal predecessors, (29), 6 states have call successors, (7), 1 states have call predecessors, (7), 3 states have return successors, (7), 3 states have call predecessors, (7), 6 states have call successors, (7) [2021-10-13 06:44:24,818 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 06:44:24,818 INFO L93 Difference]: Finished difference Result 66 states and 110 transitions. [2021-10-13 06:44:24,819 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-10-13 06:44:24,819 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 8 states have (on average 3.625) internal successors, (29), 10 states have internal predecessors, (29), 6 states have call successors, (7), 1 states have call predecessors, (7), 3 states have return successors, (7), 3 states have call predecessors, (7), 6 states have call successors, (7) Word has length 35 [2021-10-13 06:44:24,820 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 06:44:24,821 INFO L225 Difference]: With dead ends: 66 [2021-10-13 06:44:24,821 INFO L226 Difference]: Without dead ends: 62 [2021-10-13 06:44:24,822 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 208 GetRequests, 198 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 78.3ms TimeCoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2021-10-13 06:44:24,822 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2021-10-13 06:44:24,835 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 53. [2021-10-13 06:44:24,839 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 31 states have (on average 1.1935483870967742) internal successors, (37), 34 states have internal predecessors, (37), 11 states have call successors, (11), 3 states have call predecessors, (11), 10 states have return successors, (41), 15 states have call predecessors, (41), 11 states have call successors, (41) [2021-10-13 06:44:24,841 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 89 transitions. [2021-10-13 06:44:24,841 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 89 transitions. Word has length 35 [2021-10-13 06:44:24,842 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 06:44:24,842 INFO L470 AbstractCegarLoop]: Abstraction has 53 states and 89 transitions. [2021-10-13 06:44:24,843 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 8 states have (on average 3.625) internal successors, (29), 10 states have internal predecessors, (29), 6 states have call successors, (7), 1 states have call predecessors, (7), 3 states have return successors, (7), 3 states have call predecessors, (7), 6 states have call successors, (7) [2021-10-13 06:44:24,843 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 89 transitions. [2021-10-13 06:44:24,847 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-10-13 06:44:24,847 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 06:44:24,847 INFO L512 BasicCegarLoop]: trace histogram [3, 3, 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] [2021-10-13 06:44:24,854 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (15)] Forceful destruction successful, exit code 0 [2021-10-13 06:44:25,057 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (14)] Forceful destruction successful, exit code 0 [2021-10-13 06:44:25,273 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-10-13 06:44:25,450 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 06:44:25,450 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-13 06:44:25,451 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 06:44:25,451 INFO L82 PathProgramCache]: Analyzing trace with hash 1761102882, now seen corresponding path program 2 times [2021-10-13 06:44:25,451 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-13 06:44:25,451 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [730605403] [2021-10-13 06:44:25,451 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-10-13 06:44:25,451 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 06:44:25,451 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/mathsat [2021-10-13 06:44:25,452 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 06:44:25,454 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (17)] Waiting until timeout for monitored process [2021-10-13 06:44:25,687 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-10-13 06:44:25,687 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-13 06:44:25,690 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 8 conjunts are in the unsatisfiable core [2021-10-13 06:44:25,691 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 06:44:25,857 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-10-13 06:44:25,858 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 06:44:26,363 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 11 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-10-13 06:44:26,363 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-13 06:44:26,363 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [730605403] [2021-10-13 06:44:26,363 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [730605403] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 06:44:26,363 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1769982265] [2021-10-13 06:44:26,364 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-10-13 06:44:26,364 INFO L170 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-10-13 06:44:26,364 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/cvc4 [2021-10-13 06:44:26,365 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-10-13 06:44:26,393 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (18)] Waiting until timeout for monitored process [2021-10-13 06:44:26,752 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-10-13 06:44:26,752 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-13 06:44:26,753 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 6 conjunts are in the unsatisfiable core [2021-10-13 06:44:26,754 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 06:44:26,873 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-10-13 06:44:26,873 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 06:44:27,122 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-10-13 06:44:27,122 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1769982265] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 06:44:27,122 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1060360216] [2021-10-13 06:44:27,122 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-10-13 06:44:27,122 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 06:44:27,123 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/z3 [2021-10-13 06:44:27,123 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 06:44:27,126 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-10-13 06:44:27,537 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-10-13 06:44:27,537 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-13 06:44:27,539 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 6 conjunts are in the unsatisfiable core [2021-10-13 06:44:27,540 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 06:44:27,618 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-10-13 06:44:27,618 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 06:44:27,798 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-10-13 06:44:27,798 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1060360216] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 06:44:27,798 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2021-10-13 06:44:27,799 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9, 7, 7, 7, 7] total 17 [2021-10-13 06:44:27,799 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [957260178] [2021-10-13 06:44:27,799 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-10-13 06:44:27,800 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-13 06:44:27,800 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-10-13 06:44:27,801 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2021-10-13 06:44:27,801 INFO L87 Difference]: Start difference. First operand 53 states and 89 transitions. Second operand has 17 states, 14 states have (on average 3.2857142857142856) internal successors, (46), 17 states have internal predecessors, (46), 11 states have call successors, (14), 1 states have call predecessors, (14), 6 states have return successors, (16), 7 states have call predecessors, (16), 11 states have call successors, (16) [2021-10-13 06:44:28,225 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 06:44:28,225 INFO L93 Difference]: Finished difference Result 133 states and 295 transitions. [2021-10-13 06:44:28,226 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-10-13 06:44:28,226 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 14 states have (on average 3.2857142857142856) internal successors, (46), 17 states have internal predecessors, (46), 11 states have call successors, (14), 1 states have call predecessors, (14), 6 states have return successors, (16), 7 states have call predecessors, (16), 11 states have call successors, (16) Word has length 35 [2021-10-13 06:44:28,227 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 06:44:28,229 INFO L225 Difference]: With dead ends: 133 [2021-10-13 06:44:28,229 INFO L226 Difference]: Without dead ends: 83 [2021-10-13 06:44:28,232 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 211 GetRequests, 191 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 342.3ms TimeCoverageRelationStatistics Valid=80, Invalid=382, Unknown=0, NotChecked=0, Total=462 [2021-10-13 06:44:28,232 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2021-10-13 06:44:28,249 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 71. [2021-10-13 06:44:28,249 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 40 states have (on average 1.15) internal successors, (46), 44 states have internal predecessors, (46), 15 states have call successors, (15), 3 states have call predecessors, (15), 15 states have return successors, (86), 23 states have call predecessors, (86), 15 states have call successors, (86) [2021-10-13 06:44:28,251 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 147 transitions. [2021-10-13 06:44:28,251 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 147 transitions. Word has length 35 [2021-10-13 06:44:28,252 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 06:44:28,252 INFO L470 AbstractCegarLoop]: Abstraction has 71 states and 147 transitions. [2021-10-13 06:44:28,252 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 14 states have (on average 3.2857142857142856) internal successors, (46), 17 states have internal predecessors, (46), 11 states have call successors, (14), 1 states have call predecessors, (14), 6 states have return successors, (16), 7 states have call predecessors, (16), 11 states have call successors, (16) [2021-10-13 06:44:28,252 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 147 transitions. [2021-10-13 06:44:28,254 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-10-13 06:44:28,254 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 06:44:28,255 INFO L512 BasicCegarLoop]: trace histogram [3, 3, 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] [2021-10-13 06:44:28,293 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2021-10-13 06:44:28,476 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (17)] Forceful destruction successful, exit code 0 [2021-10-13 06:44:28,671 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (18)] Forceful destruction successful, exit code 0 [2021-10-13 06:44:28,869 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt [2021-10-13 06:44:28,869 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-13 06:44:28,870 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 06:44:28,870 INFO L82 PathProgramCache]: Analyzing trace with hash 1656487097, now seen corresponding path program 2 times [2021-10-13 06:44:28,870 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-13 06:44:28,870 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1945796386] [2021-10-13 06:44:28,870 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-10-13 06:44:28,870 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 06:44:28,870 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/mathsat [2021-10-13 06:44:28,871 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 06:44:28,873 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (20)] Waiting until timeout for monitored process [2021-10-13 06:44:29,154 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-10-13 06:44:29,155 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-13 06:44:29,156 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 8 conjunts are in the unsatisfiable core [2021-10-13 06:44:29,157 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 06:44:29,304 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-10-13 06:44:29,304 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 06:44:29,615 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 11 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-10-13 06:44:29,615 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-13 06:44:29,615 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1945796386] [2021-10-13 06:44:29,615 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1945796386] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 06:44:29,616 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [251378119] [2021-10-13 06:44:29,616 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-10-13 06:44:29,616 INFO L170 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-10-13 06:44:29,616 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/cvc4 [2021-10-13 06:44:29,621 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-10-13 06:44:29,623 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (21)] Waiting until timeout for monitored process [2021-10-13 06:44:30,057 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-10-13 06:44:30,058 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-13 06:44:30,059 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 8 conjunts are in the unsatisfiable core [2021-10-13 06:44:30,060 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 06:44:30,156 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-10-13 06:44:30,156 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 06:44:30,451 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 11 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-10-13 06:44:30,451 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [251378119] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 06:44:30,451 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1002210746] [2021-10-13 06:44:30,451 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-10-13 06:44:30,451 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 06:44:30,452 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/z3 [2021-10-13 06:44:30,453 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 06:44:30,483 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2021-10-13 06:44:30,883 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-10-13 06:44:30,883 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-13 06:44:30,885 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 8 conjunts are in the unsatisfiable core [2021-10-13 06:44:30,886 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 06:44:30,983 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-10-13 06:44:30,983 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 06:44:31,210 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 11 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-10-13 06:44:31,211 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1002210746] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 06:44:31,211 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2021-10-13 06:44:31,211 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9, 8, 9, 8, 9] total 12 [2021-10-13 06:44:31,211 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [712954511] [2021-10-13 06:44:31,212 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-10-13 06:44:31,212 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-13 06:44:31,212 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-10-13 06:44:31,212 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=104, Unknown=0, NotChecked=0, Total=132 [2021-10-13 06:44:31,213 INFO L87 Difference]: Start difference. First operand 71 states and 147 transitions. Second operand has 12 states, 10 states have (on average 3.3) internal successors, (33), 12 states have internal predecessors, (33), 8 states have call successors, (8), 1 states have call predecessors, (8), 4 states have return successors, (8), 3 states have call predecessors, (8), 8 states have call successors, (8) [2021-10-13 06:44:31,416 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 06:44:31,417 INFO L93 Difference]: Finished difference Result 157 states and 404 transitions. [2021-10-13 06:44:31,417 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-10-13 06:44:31,418 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 10 states have (on average 3.3) internal successors, (33), 12 states have internal predecessors, (33), 8 states have call successors, (8), 1 states have call predecessors, (8), 4 states have return successors, (8), 3 states have call predecessors, (8), 8 states have call successors, (8) Word has length 35 [2021-10-13 06:44:31,418 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 06:44:31,420 INFO L225 Difference]: With dead ends: 157 [2021-10-13 06:44:31,420 INFO L226 Difference]: Without dead ends: 89 [2021-10-13 06:44:31,422 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 210 GetRequests, 197 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 109.7ms TimeCoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2021-10-13 06:44:31,422 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2021-10-13 06:44:31,437 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 83. [2021-10-13 06:44:31,438 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 46 states have (on average 1.1304347826086956) internal successors, (52), 50 states have internal predecessors, (52), 18 states have call successors, (18), 3 states have call predecessors, (18), 18 states have return successors, (122), 29 states have call predecessors, (122), 18 states have call successors, (122) [2021-10-13 06:44:31,440 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 192 transitions. [2021-10-13 06:44:31,441 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 192 transitions. Word has length 35 [2021-10-13 06:44:31,441 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 06:44:31,441 INFO L470 AbstractCegarLoop]: Abstraction has 83 states and 192 transitions. [2021-10-13 06:44:31,442 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 10 states have (on average 3.3) internal successors, (33), 12 states have internal predecessors, (33), 8 states have call successors, (8), 1 states have call predecessors, (8), 4 states have return successors, (8), 3 states have call predecessors, (8), 8 states have call successors, (8) [2021-10-13 06:44:31,442 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 192 transitions. [2021-10-13 06:44:31,445 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-10-13 06:44:31,445 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 06:44:31,445 INFO L512 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 06:44:31,464 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (20)] Forceful destruction successful, exit code 0 [2021-10-13 06:44:31,663 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (21)] Forceful destruction successful, exit code 0 [2021-10-13 06:44:31,879 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Ended with exit code 0 [2021-10-13 06:44:32,057 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 06:44:32,058 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-13 06:44:32,058 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 06:44:32,058 INFO L82 PathProgramCache]: Analyzing trace with hash 1792243333, now seen corresponding path program 1 times [2021-10-13 06:44:32,058 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-13 06:44:32,058 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [249151313] [2021-10-13 06:44:32,059 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 06:44:32,059 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 06:44:32,059 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/mathsat [2021-10-13 06:44:32,060 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 06:44:32,061 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (23)] Waiting until timeout for monitored process [2021-10-13 06:44:32,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 06:44:32,399 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 10 conjunts are in the unsatisfiable core [2021-10-13 06:44:32,400 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 06:44:32,625 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 4 proven. 22 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-10-13 06:44:32,626 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 06:44:33,304 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 4 proven. 26 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-10-13 06:44:33,304 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-13 06:44:33,304 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [249151313] [2021-10-13 06:44:33,304 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [249151313] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 06:44:33,305 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [805329398] [2021-10-13 06:44:33,305 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 06:44:33,305 INFO L170 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-10-13 06:44:33,305 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/cvc4 [2021-10-13 06:44:33,307 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-10-13 06:44:33,308 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (24)] Waiting until timeout for monitored process [2021-10-13 06:44:33,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 06:44:33,802 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 16 conjunts are in the unsatisfiable core [2021-10-13 06:44:33,803 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 06:44:34,229 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-10-13 06:44:34,229 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 06:44:35,043 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 8 proven. 10 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-10-13 06:44:35,043 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [805329398] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 06:44:35,043 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1528199621] [2021-10-13 06:44:35,043 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 06:44:35,043 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 06:44:35,044 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/z3 [2021-10-13 06:44:35,044 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 06:44:35,068 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2021-10-13 06:44:35,548 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 06:44:35,550 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 7 conjunts are in the unsatisfiable core [2021-10-13 06:44:35,551 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 06:44:35,846 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 15 proven. 5 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-10-13 06:44:35,847 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 06:44:36,407 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 15 proven. 5 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-10-13 06:44:36,408 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1528199621] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 06:44:36,408 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2021-10-13 06:44:36,408 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11, 14, 16, 8, 8] total 43 [2021-10-13 06:44:36,408 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1705950638] [2021-10-13 06:44:36,409 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2021-10-13 06:44:36,409 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-13 06:44:36,410 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-10-13 06:44:36,410 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=133, Invalid=1673, Unknown=0, NotChecked=0, Total=1806 [2021-10-13 06:44:36,411 INFO L87 Difference]: Start difference. First operand 83 states and 192 transitions. Second operand has 43 states, 34 states have (on average 2.1470588235294117) internal successors, (73), 29 states have internal predecessors, (73), 20 states have call successors, (26), 1 states have call predecessors, (26), 14 states have return successors, (35), 22 states have call predecessors, (35), 20 states have call successors, (35) [2021-10-13 06:44:39,963 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 06:44:39,963 INFO L93 Difference]: Finished difference Result 255 states and 819 transitions. [2021-10-13 06:44:39,964 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2021-10-13 06:44:39,964 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 34 states have (on average 2.1470588235294117) internal successors, (73), 29 states have internal predecessors, (73), 20 states have call successors, (26), 1 states have call predecessors, (26), 14 states have return successors, (35), 22 states have call predecessors, (35), 20 states have call successors, (35) Word has length 47 [2021-10-13 06:44:39,964 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 06:44:39,968 INFO L225 Difference]: With dead ends: 255 [2021-10-13 06:44:39,968 INFO L226 Difference]: Without dead ends: 175 [2021-10-13 06:44:39,973 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 316 GetRequests, 238 SyntacticMatches, 0 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1149 ImplicationChecksByTransitivity, 3287.4ms TimeCoverageRelationStatistics Valid=593, Invalid=5727, Unknown=0, NotChecked=0, Total=6320 [2021-10-13 06:44:39,973 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 175 states. [2021-10-13 06:44:40,000 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 175 to 100. [2021-10-13 06:44:40,000 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 100 states, 58 states have (on average 1.1551724137931034) internal successors, (67), 62 states have internal predecessors, (67), 20 states have call successors, (20), 6 states have call predecessors, (20), 21 states have return successors, (94), 31 states have call predecessors, (94), 20 states have call successors, (94) [2021-10-13 06:44:40,003 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 181 transitions. [2021-10-13 06:44:40,003 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 181 transitions. Word has length 47 [2021-10-13 06:44:40,004 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 06:44:40,004 INFO L470 AbstractCegarLoop]: Abstraction has 100 states and 181 transitions. [2021-10-13 06:44:40,004 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 34 states have (on average 2.1470588235294117) internal successors, (73), 29 states have internal predecessors, (73), 20 states have call successors, (26), 1 states have call predecessors, (26), 14 states have return successors, (35), 22 states have call predecessors, (35), 20 states have call successors, (35) [2021-10-13 06:44:40,004 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 181 transitions. [2021-10-13 06:44:40,008 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2021-10-13 06:44:40,009 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 06:44:40,009 INFO L512 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 6, 5, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 06:44:40,049 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2021-10-13 06:44:40,235 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (24)] Ended with exit code 0 [2021-10-13 06:44:40,440 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (23)] Ended with exit code 0 [2021-10-13 06:44:40,633 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 [2021-10-13 06:44:40,633 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-13 06:44:40,634 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 06:44:40,634 INFO L82 PathProgramCache]: Analyzing trace with hash 1151479633, now seen corresponding path program 1 times [2021-10-13 06:44:40,634 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-13 06:44:40,634 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1415299739] [2021-10-13 06:44:40,634 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 06:44:40,634 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 06:44:40,634 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/mathsat [2021-10-13 06:44:40,635 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 06:44:40,637 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (26)] Waiting until timeout for monitored process [2021-10-13 06:44:41,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 06:44:41,082 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 8 conjunts are in the unsatisfiable core [2021-10-13 06:44:41,083 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 06:44:41,327 INFO L134 CoverageAnalysis]: Checked inductivity of 248 backedges. 21 proven. 56 refuted. 0 times theorem prover too weak. 171 trivial. 0 not checked. [2021-10-13 06:44:41,327 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 06:44:41,913 INFO L134 CoverageAnalysis]: Checked inductivity of 248 backedges. 21 proven. 57 refuted. 0 times theorem prover too weak. 170 trivial. 0 not checked. [2021-10-13 06:44:41,913 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-13 06:44:41,913 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1415299739] [2021-10-13 06:44:41,913 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1415299739] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 06:44:41,913 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2086453883] [2021-10-13 06:44:41,913 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 06:44:41,913 INFO L170 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-10-13 06:44:41,914 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/cvc4 [2021-10-13 06:44:41,921 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-10-13 06:44:41,936 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (27)] Waiting until timeout for monitored process [2021-10-13 06:44:42,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 06:44:42,575 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 13 conjunts are in the unsatisfiable core [2021-10-13 06:44:42,577 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 06:44:42,893 INFO L134 CoverageAnalysis]: Checked inductivity of 248 backedges. 40 proven. 55 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2021-10-13 06:44:42,893 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 06:44:43,617 INFO L134 CoverageAnalysis]: Checked inductivity of 248 backedges. 46 proven. 41 refuted. 0 times theorem prover too weak. 161 trivial. 0 not checked. [2021-10-13 06:44:43,618 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2086453883] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 06:44:43,618 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1591222521] [2021-10-13 06:44:43,618 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 06:44:43,618 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 06:44:43,618 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/z3 [2021-10-13 06:44:43,621 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 06:44:43,637 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2021-10-13 06:44:44,246 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 06:44:44,249 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 10 conjunts are in the unsatisfiable core [2021-10-13 06:44:44,251 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 06:44:44,550 INFO L134 CoverageAnalysis]: Checked inductivity of 248 backedges. 55 proven. 49 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2021-10-13 06:44:44,550 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 06:44:45,267 INFO L134 CoverageAnalysis]: Checked inductivity of 248 backedges. 55 proven. 54 refuted. 0 times theorem prover too weak. 139 trivial. 0 not checked. [2021-10-13 06:44:45,267 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1591222521] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 06:44:45,267 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2021-10-13 06:44:45,267 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9, 8, 9, 9, 11] total 27 [2021-10-13 06:44:45,267 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1925537984] [2021-10-13 06:44:45,268 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-10-13 06:44:45,268 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-13 06:44:45,269 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-10-13 06:44:45,269 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=607, Unknown=0, NotChecked=0, Total=702 [2021-10-13 06:44:45,269 INFO L87 Difference]: Start difference. First operand 100 states and 181 transitions. Second operand has 27 states, 24 states have (on average 3.2083333333333335) internal successors, (77), 27 states have internal predecessors, (77), 18 states have call successors, (27), 1 states have call predecessors, (27), 11 states have return successors, (36), 15 states have call predecessors, (36), 18 states have call successors, (36) [2021-10-13 06:44:46,457 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 06:44:46,458 INFO L93 Difference]: Finished difference Result 272 states and 718 transitions. [2021-10-13 06:44:46,459 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-10-13 06:44:46,459 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 24 states have (on average 3.2083333333333335) internal successors, (77), 27 states have internal predecessors, (77), 18 states have call successors, (27), 1 states have call predecessors, (27), 11 states have return successors, (36), 15 states have call predecessors, (36), 18 states have call successors, (36) Word has length 98 [2021-10-13 06:44:46,460 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 06:44:46,464 INFO L225 Difference]: With dead ends: 272 [2021-10-13 06:44:46,464 INFO L226 Difference]: Without dead ends: 142 [2021-10-13 06:44:46,469 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 597 GetRequests, 557 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 294 ImplicationChecksByTransitivity, 673.2ms TimeCoverageRelationStatistics Valid=282, Invalid=1440, Unknown=0, NotChecked=0, Total=1722 [2021-10-13 06:44:46,469 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2021-10-13 06:44:46,498 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 101. [2021-10-13 06:44:46,498 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 101 states, 62 states have (on average 1.1451612903225807) internal successors, (71), 64 states have internal predecessors, (71), 18 states have call successors, (18), 9 states have call predecessors, (18), 20 states have return successors, (75), 27 states have call predecessors, (75), 18 states have call successors, (75) [2021-10-13 06:44:46,501 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 164 transitions. [2021-10-13 06:44:46,502 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 164 transitions. Word has length 98 [2021-10-13 06:44:46,502 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 06:44:46,502 INFO L470 AbstractCegarLoop]: Abstraction has 101 states and 164 transitions. [2021-10-13 06:44:46,503 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 24 states have (on average 3.2083333333333335) internal successors, (77), 27 states have internal predecessors, (77), 18 states have call successors, (27), 1 states have call predecessors, (27), 11 states have return successors, (36), 15 states have call predecessors, (36), 18 states have call successors, (36) [2021-10-13 06:44:46,503 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 164 transitions. [2021-10-13 06:44:46,504 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-10-13 06:44:46,505 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 06:44:46,505 INFO L512 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 06:44:46,521 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (26)] Forceful destruction successful, exit code 0 [2021-10-13 06:44:46,724 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (27)] Forceful destruction successful, exit code 0 [2021-10-13 06:44:46,959 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2021-10-13 06:44:47,118 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3,27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt,28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 06:44:47,118 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-13 06:44:47,118 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 06:44:47,119 INFO L82 PathProgramCache]: Analyzing trace with hash -175386786, now seen corresponding path program 2 times [2021-10-13 06:44:47,119 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-13 06:44:47,119 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [767690269] [2021-10-13 06:44:47,119 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-10-13 06:44:47,119 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 06:44:47,119 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/mathsat [2021-10-13 06:44:47,122 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 06:44:47,141 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (29)] Waiting until timeout for monitored process [2021-10-13 06:44:47,757 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-10-13 06:44:47,757 INFO L229 tOrderPrioritization]: Conjunction of SSA is sat [2021-10-13 06:44:47,757 INFO L354 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-10-13 06:44:47,820 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-10-13 06:44:47,863 INFO L133 FreeRefinementEngine]: Strategy WALRUS found a feasible trace [2021-10-13 06:44:47,863 INFO L626 BasicCegarLoop]: Counterexample is feasible [2021-10-13 06:44:47,864 INFO L764 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION [2021-10-13 06:44:47,883 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (29)] Forceful destruction successful, exit code 0 [2021-10-13 06:44:48,079 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 [2021-10-13 06:44:48,086 INFO L179 ceAbstractionStarter]: Computing trace abstraction results [2021-10-13 06:44:48,151 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 13.10 06:44:48 BoogieIcfgContainer [2021-10-13 06:44:48,151 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-10-13 06:44:48,151 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2021-10-13 06:44:48,151 INFO L271 PluginConnector]: Initializing Witness Printer... [2021-10-13 06:44:48,152 INFO L275 PluginConnector]: Witness Printer initialized [2021-10-13 06:44:48,152 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.10 06:44:11" (3/4) ... [2021-10-13 06:44:48,154 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2021-10-13 06:44:48,274 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/witness.graphml [2021-10-13 06:44:48,274 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2021-10-13 06:44:48,276 INFO L168 Benchmark]: Toolchain (without parser) took 37123.57 ms. Allocated memory was 79.7 MB in the beginning and 104.9 MB in the end (delta: 25.2 MB). Free memory was 63.3 MB in the beginning and 39.6 MB in the end (delta: 23.7 MB). Peak memory consumption was 47.9 MB. Max. memory is 16.1 GB. [2021-10-13 06:44:48,276 INFO L168 Benchmark]: CDTParser took 0.22 ms. Allocated memory is still 79.7 MB. Free memory is still 59.8 MB. There was no memory consumed. Max. memory is 16.1 GB. [2021-10-13 06:44:48,277 INFO L168 Benchmark]: CACSL2BoogieTranslator took 276.48 ms. Allocated memory is still 79.7 MB. Free memory was 63.2 MB in the beginning and 62.4 MB in the end (delta: 804.2 kB). Peak memory consumption was 11.1 MB. Max. memory is 16.1 GB. [2021-10-13 06:44:48,278 INFO L168 Benchmark]: Boogie Procedure Inliner took 30.99 ms. Allocated memory is still 79.7 MB. Free memory was 62.4 MB in the beginning and 61.0 MB in the end (delta: 1.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2021-10-13 06:44:48,278 INFO L168 Benchmark]: Boogie Preprocessor took 21.97 ms. Allocated memory is still 79.7 MB. Free memory was 61.0 MB in the beginning and 60.0 MB in the end (delta: 1.0 MB). There was no memory consumed. Max. memory is 16.1 GB. [2021-10-13 06:44:48,279 INFO L168 Benchmark]: RCFGBuilder took 390.45 ms. Allocated memory is still 79.7 MB. Free memory was 60.0 MB in the beginning and 50.1 MB in the end (delta: 9.9 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. [2021-10-13 06:44:48,279 INFO L168 Benchmark]: TraceAbstraction took 36274.96 ms. Allocated memory was 79.7 MB in the beginning and 104.9 MB in the end (delta: 25.2 MB). Free memory was 49.6 MB in the beginning and 43.8 MB in the end (delta: 5.7 MB). Peak memory consumption was 30.5 MB. Max. memory is 16.1 GB. [2021-10-13 06:44:48,280 INFO L168 Benchmark]: Witness Printer took 122.76 ms. Allocated memory is still 104.9 MB. Free memory was 43.8 MB in the beginning and 39.6 MB in the end (delta: 4.2 MB). Peak memory consumption was 4.2 MB. Max. memory is 16.1 GB. [2021-10-13 06:44:48,283 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.22 ms. Allocated memory is still 79.7 MB. Free memory is still 59.8 MB. There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 276.48 ms. Allocated memory is still 79.7 MB. Free memory was 63.2 MB in the beginning and 62.4 MB in the end (delta: 804.2 kB). Peak memory consumption was 11.1 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 30.99 ms. Allocated memory is still 79.7 MB. Free memory was 62.4 MB in the beginning and 61.0 MB in the end (delta: 1.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Boogie Preprocessor took 21.97 ms. Allocated memory is still 79.7 MB. Free memory was 61.0 MB in the beginning and 60.0 MB in the end (delta: 1.0 MB). There was no memory consumed. Max. memory is 16.1 GB. * RCFGBuilder took 390.45 ms. Allocated memory is still 79.7 MB. Free memory was 60.0 MB in the beginning and 50.1 MB in the end (delta: 9.9 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. * TraceAbstraction took 36274.96 ms. Allocated memory was 79.7 MB in the beginning and 104.9 MB in the end (delta: 25.2 MB). Free memory was 49.6 MB in the beginning and 43.8 MB in the end (delta: 5.7 MB). Peak memory consumption was 30.5 MB. Max. memory is 16.1 GB. * Witness Printer took 122.76 ms. Allocated memory is still 104.9 MB. Free memory was 43.8 MB in the beginning and 39.6 MB in the end (delta: 4.2 MB). Peak memory consumption was 4.2 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.0ms ErrorAutomatonConstructionTimeTotal, 0.0ms FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.0ms ErrorAutomatonConstructionTimeAvg, 0.0ms ErrorAutomatonDifferenceTimeAvg, 0.0ms ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - CounterExampleResult [Line: 41]: a call to reach_error is reachable a call to reach_error is reachable We found a FailurePath: [L38] int x = 4; [L39] CALL, EXPR fibo1(x) VAL [\old(n)=4] [L10] COND FALSE !(n < 1) VAL [\old(n)=4, n=4] [L12] COND FALSE !(n == 1) VAL [\old(n)=4, n=4] [L15] CALL, EXPR fibo2(n-1) VAL [\old(n)=3] [L20] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L22] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L25] CALL, EXPR fibo1(n-1) VAL [\old(n)=2] [L10] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L12] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L15] CALL, EXPR fibo2(n-1) VAL [\old(n)=1] [L20] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L22] COND TRUE n == 1 [L23] return 1; VAL [\old(n)=1, \result=1, n=1] [L15] RET, EXPR fibo2(n-1) VAL [\old(n)=2, fibo2(n-1)=1, n=2] [L15] CALL, EXPR fibo2(n-2) VAL [\old(n)=0] [L20] COND TRUE n < 1 [L21] return 0; VAL [\old(n)=0, \result=0, n=0] [L15] RET, EXPR fibo2(n-2) VAL [\old(n)=2, fibo2(n-1)=1, fibo2(n-2)=0, n=2] [L15] return fibo2(n-1) + fibo2(n-2); [L25] RET, EXPR fibo1(n-1) VAL [\old(n)=3, fibo1(n-1)=1, n=3] [L25] CALL, EXPR fibo1(n-2) VAL [\old(n)=1] [L10] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L12] COND TRUE n == 1 [L13] return 1; VAL [\old(n)=1, \result=1, n=1] [L25] RET, EXPR fibo1(n-2) VAL [\old(n)=3, fibo1(n-1)=1, fibo1(n-2)=1, n=3] [L25] return fibo1(n-1) + fibo1(n-2); [L15] RET, EXPR fibo2(n-1) VAL [\old(n)=4, fibo2(n-1)=2, n=4] [L15] CALL, EXPR fibo2(n-2) VAL [\old(n)=2] [L20] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L22] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L25] CALL, EXPR fibo1(n-1) VAL [\old(n)=1] [L10] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L12] COND TRUE n == 1 [L13] return 1; VAL [\old(n)=1, \result=1, n=1] [L25] RET, EXPR fibo1(n-1) VAL [\old(n)=2, fibo1(n-1)=1, n=2] [L25] CALL, EXPR fibo1(n-2) VAL [\old(n)=0] [L10] COND TRUE n < 1 [L11] return 0; VAL [\old(n)=0, \result=0, n=0] [L25] RET, EXPR fibo1(n-2) VAL [\old(n)=2, fibo1(n-1)=1, fibo1(n-2)=0, n=2] [L25] return fibo1(n-1) + fibo1(n-2); [L15] RET, EXPR fibo2(n-2) VAL [\old(n)=4, fibo2(n-1)=2, fibo2(n-2)=1, n=4] [L15] return fibo2(n-1) + fibo2(n-2); [L39] RET, EXPR fibo1(x) [L39] int result = fibo1(x); [L40] COND TRUE result == 3 [L41] reach_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 3 procedures, 27 locations, 1 error locations. Started 1 CEGAR loops. OverallTime: 36151.4ms, OverallIterations: 12, TraceHistogramMax: 8, EmptinessCheckTime: 45.7ms, AutomataDifference: 6635.5ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 0.0ms, InitialAbstractionConstructionTime: 11.3ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 281 SDtfs, 307 SDslu, 2008 SDs, 0 SdLazy, 3266 SolverSat, 441 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 3035.6ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 2151 GetRequests, 1899 SyntacticMatches, 0 SemanticMatches, 252 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1721 ImplicationChecksByTransitivity, 6040.0ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=101occurred in iteration=11, InterpolantAutomatonStates: 149, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0ms DumpTime, AutomataMinimizationStatistics: 232.8ms AutomataMinimizationTime, 11 MinimizatonAttempts, 183 StatesRemovedByMinimization, 10 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 214.2ms SsaConstructionTime, 623.9ms SatisfiabilityAnalysisTime, 14916.7ms InterpolantComputationTime, 1121 NumberOfCodeBlocks, 1121 NumberOfCodeBlocksAsserted, 35 NumberOfCheckSat, 2066 ConstructedInterpolants, 0 QuantifiedInterpolants, 4938 SizeOfPredicates, 69 NumberOfNonLiveVariables, 1996 ConjunctsInSsa, 207 ConjunctsInUnsatCore, 54 InterpolantComputations, 9 PerfectInterpolantSequences, 1677/2258 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! [2021-10-13 06:44:48,343 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f436422-4b01-4fde-b05c-04bb93d6a2bb/bin/utaipan-q2qaUkNPG8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 0 Received shutdown request...