./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/seq-mthreaded/pals_opt-floodmax.3_overflow.ufo.UNBOUNDED.pals.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 839c364b Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_43ba31d7-a220-4c67-ae5f-a5456c52c8b4/bin/utaipan-eEHZpOm5b7/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_43ba31d7-a220-4c67-ae5f-a5456c52c8b4/bin/utaipan-eEHZpOm5b7/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_43ba31d7-a220-4c67-ae5f-a5456c52c8b4/bin/utaipan-eEHZpOm5b7/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_43ba31d7-a220-4c67-ae5f-a5456c52c8b4/bin/utaipan-eEHZpOm5b7/config/TaipanReach.xml -i ../../sv-benchmarks/c/seq-mthreaded/pals_opt-floodmax.3_overflow.ufo.UNBOUNDED.pals.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_43ba31d7-a220-4c67-ae5f-a5456c52c8b4/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_43ba31d7-a220-4c67-ae5f-a5456c52c8b4/bin/utaipan-eEHZpOm5b7 --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 1f7b08d697525a6b6e4b6c32e081a52208b7f6ea0ef3da259b2ed32d3a516e9b --- Real Ultimate output --- This is Ultimate 0.2.2-hotfix-svcomp22-839c364 [2021-11-25 18:58:01,370 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-25 18:58:01,373 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-25 18:58:01,423 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-25 18:58:01,423 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-25 18:58:01,425 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-25 18:58:01,426 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-25 18:58:01,429 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-25 18:58:01,430 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-25 18:58:01,431 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-25 18:58:01,433 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-25 18:58:01,434 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-25 18:58:01,434 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-25 18:58:01,435 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-25 18:58:01,437 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-25 18:58:01,438 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-25 18:58:01,439 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-25 18:58:01,441 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-25 18:58:01,443 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-25 18:58:01,445 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-25 18:58:01,447 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-25 18:58:01,449 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-25 18:58:01,450 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-25 18:58:01,451 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-25 18:58:01,455 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-25 18:58:01,455 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-25 18:58:01,456 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-25 18:58:01,457 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-25 18:58:01,457 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-25 18:58:01,458 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-25 18:58:01,459 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-25 18:58:01,460 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-25 18:58:01,461 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-25 18:58:01,462 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-25 18:58:01,463 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-25 18:58:01,463 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-25 18:58:01,464 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-25 18:58:01,464 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-25 18:58:01,465 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-25 18:58:01,466 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-25 18:58:01,467 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-25 18:58:01,467 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_43ba31d7-a220-4c67-ae5f-a5456c52c8b4/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-25 18:58:01,496 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-25 18:58:01,496 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-25 18:58:01,497 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-25 18:58:01,497 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-25 18:58:01,498 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-25 18:58:01,498 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-25 18:58:01,498 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-25 18:58:01,498 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-25 18:58:01,498 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-25 18:58:01,499 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-25 18:58:01,499 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-25 18:58:01,499 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-25 18:58:01,499 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-25 18:58:01,499 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-25 18:58:01,499 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-25 18:58:01,500 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-25 18:58:01,500 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-25 18:58:01,500 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-25 18:58:01,501 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-25 18:58:01,501 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-25 18:58:01,501 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-25 18:58:01,501 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-25 18:58:01,501 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-25 18:58:01,502 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-25 18:58:01,502 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-25 18:58:01,509 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-25 18:58:01,510 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-25 18:58:01,510 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-25 18:58:01,511 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-25 18:58:01,511 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-25 18:58:01,512 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-25 18:58:01,512 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-25 18:58:01,512 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 18:58:01,512 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-25 18:58:01,512 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-25 18:58:01,513 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-25 18:58:01,514 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-25 18:58:01,514 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-25 18:58:01,514 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-25 18:58:01,515 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-25 18:58:01,515 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-25 18:58:01,515 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_43ba31d7-a220-4c67-ae5f-a5456c52c8b4/bin/utaipan-eEHZpOm5b7/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_43ba31d7-a220-4c67-ae5f-a5456c52c8b4/bin/utaipan-eEHZpOm5b7 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 1f7b08d697525a6b6e4b6c32e081a52208b7f6ea0ef3da259b2ed32d3a516e9b [2021-11-25 18:58:01,761 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-25 18:58:01,781 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-25 18:58:01,783 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-25 18:58:01,784 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-25 18:58:01,785 INFO L275 PluginConnector]: CDTParser initialized [2021-11-25 18:58:01,786 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_43ba31d7-a220-4c67-ae5f-a5456c52c8b4/bin/utaipan-eEHZpOm5b7/../../sv-benchmarks/c/seq-mthreaded/pals_opt-floodmax.3_overflow.ufo.UNBOUNDED.pals.c [2021-11-25 18:58:01,835 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_43ba31d7-a220-4c67-ae5f-a5456c52c8b4/bin/utaipan-eEHZpOm5b7/data/d0321a7e8/f1b5e9ad45c547fca2f609ec2bc578d0/FLAG710b174c3 [2021-11-25 18:58:02,323 INFO L306 CDTParser]: Found 1 translation units. [2021-11-25 18:58:02,323 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_43ba31d7-a220-4c67-ae5f-a5456c52c8b4/sv-benchmarks/c/seq-mthreaded/pals_opt-floodmax.3_overflow.ufo.UNBOUNDED.pals.c [2021-11-25 18:58:02,333 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_43ba31d7-a220-4c67-ae5f-a5456c52c8b4/bin/utaipan-eEHZpOm5b7/data/d0321a7e8/f1b5e9ad45c547fca2f609ec2bc578d0/FLAG710b174c3 [2021-11-25 18:58:02,671 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_43ba31d7-a220-4c67-ae5f-a5456c52c8b4/bin/utaipan-eEHZpOm5b7/data/d0321a7e8/f1b5e9ad45c547fca2f609ec2bc578d0 [2021-11-25 18:58:02,674 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-25 18:58:02,675 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-25 18:58:02,682 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-25 18:58:02,682 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-25 18:58:02,686 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-25 18:58:02,686 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 06:58:02" (1/1) ... [2021-11-25 18:58:02,688 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1b5d52ca and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:58:02, skipping insertion in model container [2021-11-25 18:58:02,688 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 06:58:02" (1/1) ... [2021-11-25 18:58:02,696 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-25 18:58:02,736 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-25 18:58:02,988 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_43ba31d7-a220-4c67-ae5f-a5456c52c8b4/sv-benchmarks/c/seq-mthreaded/pals_opt-floodmax.3_overflow.ufo.UNBOUNDED.pals.c[14467,14480] [2021-11-25 18:58:02,990 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 18:58:02,999 INFO L203 MainTranslator]: Completed pre-run [2021-11-25 18:58:03,085 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_43ba31d7-a220-4c67-ae5f-a5456c52c8b4/sv-benchmarks/c/seq-mthreaded/pals_opt-floodmax.3_overflow.ufo.UNBOUNDED.pals.c[14467,14480] [2021-11-25 18:58:03,086 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 18:58:03,107 INFO L208 MainTranslator]: Completed translation [2021-11-25 18:58:03,107 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:58:03 WrapperNode [2021-11-25 18:58:03,108 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-25 18:58:03,109 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-25 18:58:03,109 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-25 18:58:03,109 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-25 18:58:03,116 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:58:03" (1/1) ... [2021-11-25 18:58:03,127 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:58:03" (1/1) ... [2021-11-25 18:58:03,163 INFO L137 Inliner]: procedures = 23, calls = 14, calls flagged for inlining = 9, calls inlined = 9, statements flattened = 473 [2021-11-25 18:58:03,164 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-25 18:58:03,164 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-25 18:58:03,165 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-25 18:58:03,165 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-25 18:58:03,173 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:58:03" (1/1) ... [2021-11-25 18:58:03,173 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:58:03" (1/1) ... [2021-11-25 18:58:03,179 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:58:03" (1/1) ... [2021-11-25 18:58:03,179 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:58:03" (1/1) ... [2021-11-25 18:58:03,206 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:58:03" (1/1) ... [2021-11-25 18:58:03,214 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:58:03" (1/1) ... [2021-11-25 18:58:03,218 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:58:03" (1/1) ... [2021-11-25 18:58:03,223 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-25 18:58:03,224 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-25 18:58:03,224 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-25 18:58:03,224 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-25 18:58:03,225 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:58:03" (1/1) ... [2021-11-25 18:58:03,233 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 18:58:03,263 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_43ba31d7-a220-4c67-ae5f-a5456c52c8b4/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:58:03,304 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_43ba31d7-a220-4c67-ae5f-a5456c52c8b4/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-25 18:58:03,344 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_43ba31d7-a220-4c67-ae5f-a5456c52c8b4/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-25 18:58:03,360 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-25 18:58:03,361 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-25 18:58:03,361 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-25 18:58:03,361 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-25 18:58:03,510 INFO L236 CfgBuilder]: Building ICFG [2021-11-25 18:58:03,512 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-25 18:58:04,066 INFO L277 CfgBuilder]: Performing block encoding [2021-11-25 18:58:04,585 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-25 18:58:04,585 INFO L301 CfgBuilder]: Removed 1 assume(true) statements. [2021-11-25 18:58:04,588 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 06:58:04 BoogieIcfgContainer [2021-11-25 18:58:04,588 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-25 18:58:04,590 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-25 18:58:04,590 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-25 18:58:04,593 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-25 18:58:04,593 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 06:58:02" (1/3) ... [2021-11-25 18:58:04,594 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@54c35f53 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 06:58:04, skipping insertion in model container [2021-11-25 18:58:04,594 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:58:03" (2/3) ... [2021-11-25 18:58:04,595 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@54c35f53 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 06:58:04, skipping insertion in model container [2021-11-25 18:58:04,595 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 06:58:04" (3/3) ... [2021-11-25 18:58:04,596 INFO L111 eAbstractionObserver]: Analyzing ICFG pals_opt-floodmax.3_overflow.ufo.UNBOUNDED.pals.c [2021-11-25 18:58:04,601 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-25 18:58:04,601 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-25 18:58:04,648 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-25 18:58:04,655 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-25 18:58:04,655 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-25 18:58:04,668 INFO L276 IsEmpty]: Start isEmpty. Operand has 19 states, 17 states have (on average 1.7647058823529411) internal successors, (30), 18 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:58:04,673 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-11-25 18:58:04,673 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:58:04,674 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-11-25 18:58:04,675 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:58:04,680 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:58:04,680 INFO L85 PathProgramCache]: Analyzing trace with hash 1097045191, now seen corresponding path program 1 times [2021-11-25 18:58:04,689 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:58:04,689 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [491362939] [2021-11-25 18:58:04,690 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:58:04,691 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:58:05,325 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:58:05,562 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:58:05,562 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:58:05,562 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [491362939] [2021-11-25 18:58:05,563 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [491362939] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:58:05,563 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:58:05,564 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 18:58:05,566 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [476499439] [2021-11-25 18:58:05,566 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:58:05,570 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 18:58:05,571 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:58:05,603 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 18:58:05,604 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-25 18:58:05,606 INFO L87 Difference]: Start difference. First operand has 19 states, 17 states have (on average 1.7647058823529411) internal successors, (30), 18 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:58:05,745 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:58:05,746 INFO L93 Difference]: Finished difference Result 54 states and 90 transitions. [2021-11-25 18:58:05,747 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 18:58:05,748 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2021-11-25 18:58:05,749 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:58:05,762 INFO L225 Difference]: With dead ends: 54 [2021-11-25 18:58:05,763 INFO L226 Difference]: Without dead ends: 36 [2021-11-25 18:58:05,766 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-25 18:58:05,771 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 24 mSDsluCounter, 28 mSDsCounter, 0 mSdLazyCounter, 44 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 38 SdHoareTripleChecker+Invalid, 46 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 44 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:58:05,772 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [24 Valid, 38 Invalid, 46 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 44 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:58:05,788 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-11-25 18:58:05,806 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 27. [2021-11-25 18:58:05,808 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 26 states have (on average 1.6538461538461537) internal successors, (43), 26 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:58:05,810 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 43 transitions. [2021-11-25 18:58:05,811 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 43 transitions. Word has length 6 [2021-11-25 18:58:05,812 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:58:05,812 INFO L470 AbstractCegarLoop]: Abstraction has 27 states and 43 transitions. [2021-11-25 18:58:05,812 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:58:05,814 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 43 transitions. [2021-11-25 18:58:05,814 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-25 18:58:05,815 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:58:05,816 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:58:05,816 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-25 18:58:05,817 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:58:05,821 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:58:05,821 INFO L85 PathProgramCache]: Analyzing trace with hash -413971945, now seen corresponding path program 1 times [2021-11-25 18:58:05,821 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:58:05,821 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1241456121] [2021-11-25 18:58:05,822 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:58:05,822 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:58:06,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:58:06,137 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:58:06,138 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:58:06,138 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1241456121] [2021-11-25 18:58:06,138 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1241456121] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:58:06,139 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:58:06,139 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 18:58:06,139 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1658672729] [2021-11-25 18:58:06,139 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:58:06,141 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 18:58:06,141 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:58:06,141 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 18:58:06,142 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-25 18:58:06,142 INFO L87 Difference]: Start difference. First operand 27 states and 43 transitions. Second operand has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:58:06,224 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:58:06,224 INFO L93 Difference]: Finished difference Result 53 states and 81 transitions. [2021-11-25 18:58:06,224 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 18:58:06,225 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2021-11-25 18:58:06,225 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:58:06,226 INFO L225 Difference]: With dead ends: 53 [2021-11-25 18:58:06,226 INFO L226 Difference]: Without dead ends: 36 [2021-11-25 18:58:06,227 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-25 18:58:06,228 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 22 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 45 SdHoareTripleChecker+Invalid, 35 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:58:06,229 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [22 Valid, 45 Invalid, 35 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 34 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:58:06,230 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-11-25 18:58:06,234 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 27. [2021-11-25 18:58:06,234 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 26 states have (on average 1.6153846153846154) internal successors, (42), 26 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:58:06,235 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 42 transitions. [2021-11-25 18:58:06,235 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 42 transitions. Word has length 7 [2021-11-25 18:58:06,236 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:58:06,236 INFO L470 AbstractCegarLoop]: Abstraction has 27 states and 42 transitions. [2021-11-25 18:58:06,236 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:58:06,236 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 42 transitions. [2021-11-25 18:58:06,237 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-25 18:58:06,237 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:58:06,237 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:58:06,237 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-25 18:58:06,238 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:58:06,238 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:58:06,238 INFO L85 PathProgramCache]: Analyzing trace with hash -5411152, now seen corresponding path program 1 times [2021-11-25 18:58:06,238 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:58:06,239 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1910652678] [2021-11-25 18:58:06,239 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:58:06,239 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:58:06,364 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:58:06,443 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:58:06,444 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:58:06,444 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1910652678] [2021-11-25 18:58:06,444 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1910652678] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:58:06,444 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:58:06,445 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 18:58:06,445 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1015077850] [2021-11-25 18:58:06,445 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:58:06,446 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 18:58:06,446 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:58:06,446 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 18:58:06,447 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-25 18:58:06,447 INFO L87 Difference]: Start difference. First operand 27 states and 42 transitions. Second operand has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:58:06,526 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:58:06,526 INFO L93 Difference]: Finished difference Result 53 states and 80 transitions. [2021-11-25 18:58:06,527 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 18:58:06,527 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2021-11-25 18:58:06,527 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:58:06,528 INFO L225 Difference]: With dead ends: 53 [2021-11-25 18:58:06,528 INFO L226 Difference]: Without dead ends: 36 [2021-11-25 18:58:06,528 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-25 18:58:06,530 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 20 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 37 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 45 SdHoareTripleChecker+Invalid, 38 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 37 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:58:06,531 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [20 Valid, 45 Invalid, 38 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 37 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:58:06,532 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-11-25 18:58:06,535 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 27. [2021-11-25 18:58:06,535 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 26 states have (on average 1.5769230769230769) internal successors, (41), 26 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:58:06,536 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 41 transitions. [2021-11-25 18:58:06,536 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 41 transitions. Word has length 8 [2021-11-25 18:58:06,536 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:58:06,537 INFO L470 AbstractCegarLoop]: Abstraction has 27 states and 41 transitions. [2021-11-25 18:58:06,537 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:58:06,537 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 41 transitions. [2021-11-25 18:58:06,537 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-11-25 18:58:06,538 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:58:06,538 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:58:06,538 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-25 18:58:06,538 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:58:06,539 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:58:06,539 INFO L85 PathProgramCache]: Analyzing trace with hash -219476704, now seen corresponding path program 1 times [2021-11-25 18:58:06,539 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:58:06,540 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1870508813] [2021-11-25 18:58:06,540 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:58:06,540 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:58:06,673 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:58:06,747 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:58:06,747 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:58:06,747 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1870508813] [2021-11-25 18:58:06,748 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1870508813] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:58:06,748 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:58:06,748 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 18:58:06,748 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1210626378] [2021-11-25 18:58:06,749 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:58:06,750 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 18:58:06,750 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:58:06,750 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 18:58:06,751 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-25 18:58:06,751 INFO L87 Difference]: Start difference. First operand 27 states and 41 transitions. Second operand has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:58:06,848 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:58:06,848 INFO L93 Difference]: Finished difference Result 53 states and 79 transitions. [2021-11-25 18:58:06,849 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 18:58:06,849 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2021-11-25 18:58:06,850 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:58:06,851 INFO L225 Difference]: With dead ends: 53 [2021-11-25 18:58:06,851 INFO L226 Difference]: Without dead ends: 36 [2021-11-25 18:58:06,852 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-25 18:58:06,861 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 18 mSDsluCounter, 28 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 43 SdHoareTripleChecker+Invalid, 35 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:58:06,862 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [18 Valid, 43 Invalid, 35 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 34 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:58:06,864 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-11-25 18:58:06,868 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 27. [2021-11-25 18:58:06,870 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 26 states have (on average 1.5384615384615385) internal successors, (40), 26 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:58:06,871 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 40 transitions. [2021-11-25 18:58:06,872 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 40 transitions. Word has length 9 [2021-11-25 18:58:06,872 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:58:06,872 INFO L470 AbstractCegarLoop]: Abstraction has 27 states and 40 transitions. [2021-11-25 18:58:06,872 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:58:06,873 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 40 transitions. [2021-11-25 18:58:06,873 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-25 18:58:06,873 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:58:06,873 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:58:06,874 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-25 18:58:06,874 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:58:06,874 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:58:06,875 INFO L85 PathProgramCache]: Analyzing trace with hash -1937262520, now seen corresponding path program 1 times [2021-11-25 18:58:06,875 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:58:06,875 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1135583794] [2021-11-25 18:58:06,875 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:58:06,876 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:58:07,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:58:07,260 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:58:07,260 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:58:07,260 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1135583794] [2021-11-25 18:58:07,261 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1135583794] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:58:07,261 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:58:07,262 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 18:58:07,262 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1225671365] [2021-11-25 18:58:07,263 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:58:07,264 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 18:58:07,264 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:58:07,265 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 18:58:07,265 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-25 18:58:07,265 INFO L87 Difference]: Start difference. First operand 27 states and 40 transitions. Second operand has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:58:07,359 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:58:07,359 INFO L93 Difference]: Finished difference Result 53 states and 78 transitions. [2021-11-25 18:58:07,360 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 18:58:07,360 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2021-11-25 18:58:07,361 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:58:07,363 INFO L225 Difference]: With dead ends: 53 [2021-11-25 18:58:07,363 INFO L226 Difference]: Without dead ends: 36 [2021-11-25 18:58:07,364 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-25 18:58:07,369 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 15 mSDsluCounter, 28 mSDsCounter, 0 mSdLazyCounter, 40 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 42 SdHoareTripleChecker+Invalid, 41 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 40 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:58:07,370 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 42 Invalid, 41 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 40 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:58:07,371 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-11-25 18:58:07,378 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 27. [2021-11-25 18:58:07,380 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 26 states have (on average 1.5) internal successors, (39), 26 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:58:07,381 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 39 transitions. [2021-11-25 18:58:07,382 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 39 transitions. Word has length 11 [2021-11-25 18:58:07,382 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:58:07,383 INFO L470 AbstractCegarLoop]: Abstraction has 27 states and 39 transitions. [2021-11-25 18:58:07,383 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:58:07,383 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 39 transitions. [2021-11-25 18:58:07,384 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-11-25 18:58:07,388 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:58:07,389 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:58:07,389 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-25 18:58:07,389 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:58:07,390 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:58:07,390 INFO L85 PathProgramCache]: Analyzing trace with hash -13523033, now seen corresponding path program 1 times [2021-11-25 18:58:07,390 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:58:07,391 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1003605958] [2021-11-25 18:58:07,391 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:58:07,391 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:58:07,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:58:07,653 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:58:07,653 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:58:07,654 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1003605958] [2021-11-25 18:58:07,654 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1003605958] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:58:07,654 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:58:07,654 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 18:58:07,654 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [863004382] [2021-11-25 18:58:07,655 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:58:07,655 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 18:58:07,655 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:58:07,656 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 18:58:07,656 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-25 18:58:07,656 INFO L87 Difference]: Start difference. First operand 27 states and 39 transitions. Second operand has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:58:07,738 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:58:07,738 INFO L93 Difference]: Finished difference Result 54 states and 79 transitions. [2021-11-25 18:58:07,738 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 18:58:07,739 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2021-11-25 18:58:07,739 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:58:07,741 INFO L225 Difference]: With dead ends: 54 [2021-11-25 18:58:07,741 INFO L226 Difference]: Without dead ends: 35 [2021-11-25 18:58:07,741 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-25 18:58:07,743 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 12 mSDsluCounter, 38 mSDsCounter, 0 mSdLazyCounter, 25 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 57 SdHoareTripleChecker+Invalid, 28 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 25 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:58:07,744 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 57 Invalid, 28 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 25 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:58:07,744 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2021-11-25 18:58:07,747 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 27. [2021-11-25 18:58:07,748 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 26 states have (on average 1.4230769230769231) internal successors, (37), 26 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:58:07,748 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 37 transitions. [2021-11-25 18:58:07,748 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 37 transitions. Word has length 12 [2021-11-25 18:58:07,749 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:58:07,749 INFO L470 AbstractCegarLoop]: Abstraction has 27 states and 37 transitions. [2021-11-25 18:58:07,749 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:58:07,749 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 37 transitions. [2021-11-25 18:58:07,750 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-11-25 18:58:07,750 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:58:07,750 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:58:07,752 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-25 18:58:07,752 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:58:07,753 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:58:07,753 INFO L85 PathProgramCache]: Analyzing trace with hash 1403054925, now seen corresponding path program 1 times [2021-11-25 18:58:07,753 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:58:07,753 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1407923526] [2021-11-25 18:58:07,754 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:58:07,754 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:58:07,907 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:58:08,044 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:58:08,044 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:58:08,045 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1407923526] [2021-11-25 18:58:08,045 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1407923526] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:58:08,045 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:58:08,045 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 18:58:08,046 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1247557131] [2021-11-25 18:58:08,046 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:58:08,046 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 18:58:08,047 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:58:08,047 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 18:58:08,048 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-25 18:58:08,048 INFO L87 Difference]: Start difference. First operand 27 states and 37 transitions. Second operand has 4 states, 4 states have (on average 3.5) internal successors, (14), 3 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:58:08,120 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:58:08,120 INFO L93 Difference]: Finished difference Result 52 states and 73 transitions. [2021-11-25 18:58:08,120 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 18:58:08,121 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.5) internal successors, (14), 3 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2021-11-25 18:58:08,121 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:58:08,121 INFO L225 Difference]: With dead ends: 52 [2021-11-25 18:58:08,121 INFO L226 Difference]: Without dead ends: 35 [2021-11-25 18:58:08,122 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-25 18:58:08,123 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 7 mSDsluCounter, 34 mSDsCounter, 0 mSdLazyCounter, 29 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 52 SdHoareTripleChecker+Invalid, 31 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 29 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:58:08,123 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7 Valid, 52 Invalid, 31 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 29 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:58:08,124 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2021-11-25 18:58:08,131 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 28. [2021-11-25 18:58:08,131 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 27 states have (on average 1.4074074074074074) internal successors, (38), 27 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:58:08,134 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 38 transitions. [2021-11-25 18:58:08,135 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 38 transitions. Word has length 14 [2021-11-25 18:58:08,135 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:58:08,135 INFO L470 AbstractCegarLoop]: Abstraction has 28 states and 38 transitions. [2021-11-25 18:58:08,135 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.5) internal successors, (14), 3 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:58:08,136 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 38 transitions. [2021-11-25 18:58:08,137 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-11-25 18:58:08,137 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:58:08,137 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:58:08,137 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-25 18:58:08,138 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:58:08,138 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:58:08,139 INFO L85 PathProgramCache]: Analyzing trace with hash 537955432, now seen corresponding path program 1 times [2021-11-25 18:58:08,139 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:58:08,139 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [271179179] [2021-11-25 18:58:08,139 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:58:08,139 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:58:08,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:58:08,234 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:58:08,234 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:58:08,234 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [271179179] [2021-11-25 18:58:08,235 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [271179179] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:58:08,235 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:58:08,235 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-25 18:58:08,235 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [720503506] [2021-11-25 18:58:08,235 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:58:08,236 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 18:58:08,237 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:58:08,237 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 18:58:08,237 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-25 18:58:08,238 INFO L87 Difference]: Start difference. First operand 28 states and 38 transitions. Second operand has 5 states, 5 states have (on average 3.0) internal successors, (15), 5 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:58:08,404 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:58:08,404 INFO L93 Difference]: Finished difference Result 75 states and 110 transitions. [2021-11-25 18:58:08,405 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-25 18:58:08,405 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 5 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2021-11-25 18:58:08,405 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:58:08,406 INFO L225 Difference]: With dead ends: 75 [2021-11-25 18:58:08,406 INFO L226 Difference]: Without dead ends: 58 [2021-11-25 18:58:08,407 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-11-25 18:58:08,407 INFO L933 BasicCegarLoop]: 31 mSDtfsCounter, 41 mSDsluCounter, 70 mSDsCounter, 0 mSdLazyCounter, 50 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 41 SdHoareTripleChecker+Valid, 98 SdHoareTripleChecker+Invalid, 60 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 50 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:58:08,408 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [41 Valid, 98 Invalid, 60 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 50 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:58:08,408 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2021-11-25 18:58:08,412 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 33. [2021-11-25 18:58:08,412 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 32 states have (on average 1.34375) internal successors, (43), 32 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:58:08,413 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 43 transitions. [2021-11-25 18:58:08,413 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 43 transitions. Word has length 15 [2021-11-25 18:58:08,413 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:58:08,413 INFO L470 AbstractCegarLoop]: Abstraction has 33 states and 43 transitions. [2021-11-25 18:58:08,413 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 5 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:58:08,414 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 43 transitions. [2021-11-25 18:58:08,420 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-25 18:58:08,420 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:58:08,420 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:58:08,421 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-25 18:58:08,421 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:58:08,421 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:58:08,421 INFO L85 PathProgramCache]: Analyzing trace with hash 1160036396, now seen corresponding path program 1 times [2021-11-25 18:58:08,422 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:58:08,422 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1736139111] [2021-11-25 18:58:08,422 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:58:08,422 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:58:08,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:58:09,008 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:58:09,008 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:58:09,009 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1736139111] [2021-11-25 18:58:09,009 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1736139111] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:58:09,009 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1108689457] [2021-11-25 18:58:09,009 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:58:09,009 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:58:09,010 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_43ba31d7-a220-4c67-ae5f-a5456c52c8b4/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:58:09,015 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_43ba31d7-a220-4c67-ae5f-a5456c52c8b4/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:58:09,032 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_43ba31d7-a220-4c67-ae5f-a5456c52c8b4/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-25 18:58:09,188 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:58:09,192 INFO L263 TraceCheckSpWp]: Trace formula consists of 207 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-25 18:58:09,208 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:58:25,645 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:58:25,645 INFO L328 TraceCheckSpWp]: Computing backward predicates...