./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loops/vogal-2.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 7b2dab56 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/run_dir_300fa637-0b3d-4fd9-b8cd-918406cad1a8/bin/utaipan/data/config -Xmx15G -Xms4m -jar /tmp/vcloud-vcloud-master/worker/run_dir_300fa637-0b3d-4fd9-b8cd-918406cad1a8/bin/utaipan/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_300fa637-0b3d-4fd9-b8cd-918406cad1a8/bin/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_300fa637-0b3d-4fd9-b8cd-918406cad1a8/bin/utaipan/config/TaipanReach.xml -i ../../sv-benchmarks/c/loops/vogal-2.i -s /tmp/vcloud-vcloud-master/worker/run_dir_300fa637-0b3d-4fd9-b8cd-918406cad1a8/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_300fa637-0b3d-4fd9-b8cd-918406cad1a8/bin/utaipan --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 f79bd25b041237a4a64ed7e5ba6946aea6d3a337 .................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................. 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 0.2.0-7b2dab5 [2020-12-09 09:04:05,492 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-12-09 09:04:05,493 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-12-09 09:04:05,521 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-12-09 09:04:05,521 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-12-09 09:04:05,522 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-12-09 09:04:05,523 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-12-09 09:04:05,525 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-12-09 09:04:05,527 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-12-09 09:04:05,527 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-12-09 09:04:05,528 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-12-09 09:04:05,529 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-12-09 09:04:05,529 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-12-09 09:04:05,530 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-12-09 09:04:05,531 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-12-09 09:04:05,532 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-12-09 09:04:05,533 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-12-09 09:04:05,533 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-12-09 09:04:05,535 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-12-09 09:04:05,537 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-12-09 09:04:05,538 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-12-09 09:04:05,539 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-12-09 09:04:05,540 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-12-09 09:04:05,541 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-12-09 09:04:05,543 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-12-09 09:04:05,543 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-12-09 09:04:05,544 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-12-09 09:04:05,545 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-12-09 09:04:05,545 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-12-09 09:04:05,546 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-12-09 09:04:05,546 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-12-09 09:04:05,547 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-12-09 09:04:05,547 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-12-09 09:04:05,548 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-12-09 09:04:05,549 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-12-09 09:04:05,549 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-12-09 09:04:05,550 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-12-09 09:04:05,550 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-12-09 09:04:05,550 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-12-09 09:04:05,551 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-12-09 09:04:05,551 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-12-09 09:04:05,552 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/run_dir_300fa637-0b3d-4fd9-b8cd-918406cad1a8/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf [2020-12-09 09:04:05,569 INFO L113 SettingsManager]: Loading preferences was successful [2020-12-09 09:04:05,569 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-12-09 09:04:05,569 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2020-12-09 09:04:05,570 INFO L138 SettingsManager]: * User list type=DISABLED [2020-12-09 09:04:05,570 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2020-12-09 09:04:05,570 INFO L138 SettingsManager]: * Explicit value domain=true [2020-12-09 09:04:05,570 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2020-12-09 09:04:05,570 INFO L138 SettingsManager]: * Octagon Domain=false [2020-12-09 09:04:05,570 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2020-12-09 09:04:05,570 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2020-12-09 09:04:05,570 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2020-12-09 09:04:05,570 INFO L138 SettingsManager]: * Interval Domain=false [2020-12-09 09:04:05,570 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2020-12-09 09:04:05,571 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2020-12-09 09:04:05,571 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2020-12-09 09:04:05,571 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-12-09 09:04:05,571 INFO L138 SettingsManager]: * sizeof long=4 [2020-12-09 09:04:05,571 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-12-09 09:04:05,571 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-12-09 09:04:05,572 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-12-09 09:04:05,572 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-12-09 09:04:05,572 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-12-09 09:04:05,572 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-12-09 09:04:05,572 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2020-12-09 09:04:05,572 INFO L138 SettingsManager]: * sizeof long double=12 [2020-12-09 09:04:05,572 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-12-09 09:04:05,572 INFO L138 SettingsManager]: * Use constant arrays=true [2020-12-09 09:04:05,572 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-12-09 09:04:05,573 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-12-09 09:04:05,573 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-12-09 09:04:05,573 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-12-09 09:04:05,573 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-12-09 09:04:05,573 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-12-09 09:04:05,573 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-12-09 09:04:05,573 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2020-12-09 09:04:05,573 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-12-09 09:04:05,573 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-12-09 09:04:05,574 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-12-09 09:04:05,574 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2020-12-09 09:04:05,574 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-vcloud-master/worker/run_dir_300fa637-0b3d-4fd9-b8cd-918406cad1a8/bin/utaipan/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud-vcloud-master/worker/run_dir_300fa637-0b3d-4fd9-b8cd-918406cad1a8/bin/utaipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> f79bd25b041237a4a64ed7e5ba6946aea6d3a337 [2020-12-09 09:04:05,753 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-12-09 09:04:05,768 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-12-09 09:04:05,770 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-12-09 09:04:05,771 INFO L271 PluginConnector]: Initializing CDTParser... [2020-12-09 09:04:05,771 INFO L275 PluginConnector]: CDTParser initialized [2020-12-09 09:04:05,772 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_300fa637-0b3d-4fd9-b8cd-918406cad1a8/bin/utaipan/../../sv-benchmarks/c/loops/vogal-2.i [2020-12-09 09:04:05,813 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_300fa637-0b3d-4fd9-b8cd-918406cad1a8/bin/utaipan/data/2576dfcf7/bfed395b718c4e859d06f60e14969259/FLAGcaccb73df [2020-12-09 09:04:06,174 INFO L306 CDTParser]: Found 1 translation units. [2020-12-09 09:04:06,174 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_300fa637-0b3d-4fd9-b8cd-918406cad1a8/sv-benchmarks/c/loops/vogal-2.i [2020-12-09 09:04:06,179 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_300fa637-0b3d-4fd9-b8cd-918406cad1a8/bin/utaipan/data/2576dfcf7/bfed395b718c4e859d06f60e14969259/FLAGcaccb73df [2020-12-09 09:04:06,190 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_300fa637-0b3d-4fd9-b8cd-918406cad1a8/bin/utaipan/data/2576dfcf7/bfed395b718c4e859d06f60e14969259 [2020-12-09 09:04:06,192 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-12-09 09:04:06,194 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-12-09 09:04:06,195 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-12-09 09:04:06,196 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-12-09 09:04:06,199 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-12-09 09:04:06,199 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 09.12 09:04:06" (1/1) ... [2020-12-09 09:04:06,201 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1a35d75 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 09:04:06, skipping insertion in model container [2020-12-09 09:04:06,201 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 09.12 09:04:06" (1/1) ... [2020-12-09 09:04:06,207 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-12-09 09:04:06,221 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-12-09 09:04:06,316 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud-vcloud-master/worker/run_dir_300fa637-0b3d-4fd9-b8cd-918406cad1a8/sv-benchmarks/c/loops/vogal-2.i[808,821] [2020-12-09 09:04:06,333 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-09 09:04:06,339 INFO L203 MainTranslator]: Completed pre-run [2020-12-09 09:04:06,348 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud-vcloud-master/worker/run_dir_300fa637-0b3d-4fd9-b8cd-918406cad1a8/sv-benchmarks/c/loops/vogal-2.i[808,821] [2020-12-09 09:04:06,358 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-09 09:04:06,372 INFO L208 MainTranslator]: Completed translation [2020-12-09 09:04:06,372 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 09:04:06 WrapperNode [2020-12-09 09:04:06,372 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-12-09 09:04:06,373 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-12-09 09:04:06,373 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-12-09 09:04:06,374 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-12-09 09:04:06,381 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 09:04:06" (1/1) ... [2020-12-09 09:04:06,388 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 09:04:06" (1/1) ... [2020-12-09 09:04:06,407 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-12-09 09:04:06,408 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-12-09 09:04:06,408 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-12-09 09:04:06,408 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-12-09 09:04:06,416 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 09:04:06" (1/1) ... [2020-12-09 09:04:06,416 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 09:04:06" (1/1) ... [2020-12-09 09:04:06,419 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 09:04:06" (1/1) ... [2020-12-09 09:04:06,419 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 09:04:06" (1/1) ... [2020-12-09 09:04:06,425 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 09:04:06" (1/1) ... [2020-12-09 09:04:06,429 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 09:04:06" (1/1) ... [2020-12-09 09:04:06,430 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 09:04:06" (1/1) ... [2020-12-09 09:04:06,432 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-12-09 09:04:06,433 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-12-09 09:04:06,433 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-12-09 09:04:06,433 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-12-09 09:04:06,433 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 09:04:06" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_300fa637-0b3d-4fd9-b8cd-918406cad1a8/bin/utaipan/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-12-09 09:04:06,487 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-12-09 09:04:06,487 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-12-09 09:04:06,487 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-12-09 09:04:06,487 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-12-09 09:04:06,487 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-12-09 09:04:06,488 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-12-09 09:04:06,488 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-12-09 09:04:06,786 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-12-09 09:04:06,786 INFO L299 CfgBuilder]: Removed 12 assume(true) statements. [2020-12-09 09:04:06,788 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.12 09:04:06 BoogieIcfgContainer [2020-12-09 09:04:06,788 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-12-09 09:04:06,790 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-12-09 09:04:06,790 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-12-09 09:04:06,793 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-12-09 09:04:06,793 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 09.12 09:04:06" (1/3) ... [2020-12-09 09:04:06,794 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@77a49c1c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 09.12 09:04:06, skipping insertion in model container [2020-12-09 09:04:06,794 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 09:04:06" (2/3) ... [2020-12-09 09:04:06,794 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@77a49c1c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 09.12 09:04:06, skipping insertion in model container [2020-12-09 09:04:06,794 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.12 09:04:06" (3/3) ... [2020-12-09 09:04:06,795 INFO L111 eAbstractionObserver]: Analyzing ICFG vogal-2.i [2020-12-09 09:04:06,808 INFO L180 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-12-09 09:04:06,811 INFO L192 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-12-09 09:04:06,820 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-12-09 09:04:06,837 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-12-09 09:04:06,837 INFO L378 AbstractCegarLoop]: Hoare is true [2020-12-09 09:04:06,837 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-12-09 09:04:06,837 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-12-09 09:04:06,837 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-12-09 09:04:06,837 INFO L382 AbstractCegarLoop]: Difference is false [2020-12-09 09:04:06,837 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-12-09 09:04:06,837 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-12-09 09:04:06,846 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states. [2020-12-09 09:04:06,850 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2020-12-09 09:04:06,851 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 09:04:06,851 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-09 09:04:06,852 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-09 09:04:06,857 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 09:04:06,857 INFO L82 PathProgramCache]: Analyzing trace with hash 1529699898, now seen corresponding path program 1 times [2020-12-09 09:04:06,865 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 09:04:06,865 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1895297487] [2020-12-09 09:04:06,866 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 09:04:06,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 09:04:07,009 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 09:04:07,010 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1895297487] [2020-12-09 09:04:07,010 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-09 09:04:07,010 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-12-09 09:04:07,011 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1509006606] [2020-12-09 09:04:07,015 INFO L461 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-12-09 09:04:07,015 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 09:04:07,027 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-12-09 09:04:07,028 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-12-09 09:04:07,030 INFO L87 Difference]: Start difference. First operand 16 states. Second operand 2 states. [2020-12-09 09:04:07,041 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 09:04:07,042 INFO L93 Difference]: Finished difference Result 28 states and 41 transitions. [2020-12-09 09:04:07,042 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-12-09 09:04:07,042 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 9 [2020-12-09 09:04:07,043 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 09:04:07,048 INFO L225 Difference]: With dead ends: 28 [2020-12-09 09:04:07,048 INFO L226 Difference]: Without dead ends: 14 [2020-12-09 09:04:07,050 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-12-09 09:04:07,062 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-12-09 09:04:07,069 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-12-09 09:04:07,070 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-12-09 09:04:07,071 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 19 transitions. [2020-12-09 09:04:07,071 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 19 transitions. Word has length 9 [2020-12-09 09:04:07,071 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 09:04:07,072 INFO L481 AbstractCegarLoop]: Abstraction has 14 states and 19 transitions. [2020-12-09 09:04:07,072 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-12-09 09:04:07,072 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 19 transitions. [2020-12-09 09:04:07,072 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-12-09 09:04:07,072 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 09:04:07,072 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-09 09:04:07,072 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-12-09 09:04:07,072 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-09 09:04:07,073 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 09:04:07,073 INFO L82 PathProgramCache]: Analyzing trace with hash 708827924, now seen corresponding path program 1 times [2020-12-09 09:04:07,073 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 09:04:07,073 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [98709895] [2020-12-09 09:04:07,074 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 09:04:07,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 09:04:07,127 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 09:04:07,127 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [98709895] [2020-12-09 09:04:07,127 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-09 09:04:07,127 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-12-09 09:04:07,128 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [674136047] [2020-12-09 09:04:07,129 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-12-09 09:04:07,129 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 09:04:07,129 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-12-09 09:04:07,130 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-09 09:04:07,130 INFO L87 Difference]: Start difference. First operand 14 states and 19 transitions. Second operand 3 states. [2020-12-09 09:04:07,163 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 09:04:07,163 INFO L93 Difference]: Finished difference Result 36 states and 49 transitions. [2020-12-09 09:04:07,164 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-12-09 09:04:07,164 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 11 [2020-12-09 09:04:07,164 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 09:04:07,164 INFO L225 Difference]: With dead ends: 36 [2020-12-09 09:04:07,164 INFO L226 Difference]: Without dead ends: 24 [2020-12-09 09:04:07,165 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-09 09:04:07,165 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-12-09 09:04:07,167 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 15. [2020-12-09 09:04:07,168 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-12-09 09:04:07,168 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 20 transitions. [2020-12-09 09:04:07,168 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 20 transitions. Word has length 11 [2020-12-09 09:04:07,168 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 09:04:07,168 INFO L481 AbstractCegarLoop]: Abstraction has 15 states and 20 transitions. [2020-12-09 09:04:07,168 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-12-09 09:04:07,168 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 20 transitions. [2020-12-09 09:04:07,169 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-12-09 09:04:07,169 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 09:04:07,169 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-09 09:04:07,169 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-12-09 09:04:07,169 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-09 09:04:07,170 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 09:04:07,170 INFO L82 PathProgramCache]: Analyzing trace with hash -325494678, now seen corresponding path program 1 times [2020-12-09 09:04:07,170 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 09:04:07,170 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1246919805] [2020-12-09 09:04:07,170 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 09:04:07,193 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 09:04:07,231 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 09:04:07,232 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1246919805] [2020-12-09 09:04:07,232 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [177004651] [2020-12-09 09:04:07,232 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_300fa637-0b3d-4fd9-b8cd-918406cad1a8/bin/utaipan/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 09:04:07,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 09:04:07,286 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 6 conjunts are in the unsatisfiable core [2020-12-09 09:04:07,290 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 09:04:07,318 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 09:04:07,318 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 09:04:07,377 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 09:04:07,377 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1132590313] [2020-12-09 09:04:07,394 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2020-12-09 09:04:07,394 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 09:04:07,397 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-09 09:04:07,401 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-09 09:04:07,402 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-09 09:04:08,221 INFO L180 IcfgInterpreter]: Interpretation finished [2020-12-09 09:04:08,807 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 3 imperfect interpolant sequences. [2020-12-09 09:04:08,807 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [3, 3, 3] total 14 [2020-12-09 09:04:08,808 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [20690015] [2020-12-09 09:04:08,808 INFO L461 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-12-09 09:04:08,808 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 09:04:08,809 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-12-09 09:04:08,809 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=142, Unknown=0, NotChecked=0, Total=210 [2020-12-09 09:04:08,809 INFO L87 Difference]: Start difference. First operand 15 states and 20 transitions. Second operand 10 states. [2020-12-09 09:04:08,882 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 09:04:08,882 INFO L93 Difference]: Finished difference Result 32 states and 43 transitions. [2020-12-09 09:04:08,883 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-12-09 09:04:08,883 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 12 [2020-12-09 09:04:08,883 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 09:04:08,883 INFO L225 Difference]: With dead ends: 32 [2020-12-09 09:04:08,883 INFO L226 Difference]: Without dead ends: 17 [2020-12-09 09:04:08,884 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 23 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 62 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=68, Invalid=142, Unknown=0, NotChecked=0, Total=210 [2020-12-09 09:04:08,884 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-12-09 09:04:08,886 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-12-09 09:04:08,886 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-12-09 09:04:08,887 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 22 transitions. [2020-12-09 09:04:08,887 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 22 transitions. Word has length 12 [2020-12-09 09:04:08,887 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 09:04:08,887 INFO L481 AbstractCegarLoop]: Abstraction has 17 states and 22 transitions. [2020-12-09 09:04:08,887 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-12-09 09:04:08,887 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 22 transitions. [2020-12-09 09:04:08,887 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-12-09 09:04:08,887 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 09:04:08,888 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-09 09:04:09,088 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2020-12-09 09:04:09,089 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-09 09:04:09,090 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 09:04:09,091 INFO L82 PathProgramCache]: Analyzing trace with hash 1768199013, now seen corresponding path program 1 times [2020-12-09 09:04:09,091 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 09:04:09,092 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [507404630] [2020-12-09 09:04:09,092 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 09:04:09,161 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 09:04:09,252 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-12-09 09:04:09,253 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [507404630] [2020-12-09 09:04:09,253 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1870431315] [2020-12-09 09:04:09,253 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_300fa637-0b3d-4fd9-b8cd-918406cad1a8/bin/utaipan/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 09:04:09,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 09:04:09,289 INFO L263 TraceCheckSpWp]: Trace formula consists of 100 conjuncts, 5 conjunts are in the unsatisfiable core [2020-12-09 09:04:09,290 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 09:04:09,304 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-12-09 09:04:09,304 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 09:04:09,326 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-12-09 09:04:09,327 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [638463334] [2020-12-09 09:04:09,329 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2020-12-09 09:04:09,329 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 09:04:09,329 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-09 09:04:09,329 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-09 09:04:09,329 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-09 09:04:09,962 INFO L180 IcfgInterpreter]: Interpretation finished [2020-12-09 09:04:10,263 WARN L197 SmtUtils]: Spent 227.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 50 [2020-12-09 09:04:10,538 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 3 imperfect interpolant sequences. [2020-12-09 09:04:10,539 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [3, 3, 3] total 14 [2020-12-09 09:04:10,539 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [182954250] [2020-12-09 09:04:10,539 INFO L461 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-12-09 09:04:10,539 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 09:04:10,540 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-12-09 09:04:10,540 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=134, Unknown=0, NotChecked=0, Total=210 [2020-12-09 09:04:10,540 INFO L87 Difference]: Start difference. First operand 17 states and 22 transitions. Second operand 10 states. [2020-12-09 09:04:10,745 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 09:04:10,745 INFO L93 Difference]: Finished difference Result 28 states and 38 transitions. [2020-12-09 09:04:10,746 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-12-09 09:04:10,746 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 14 [2020-12-09 09:04:10,746 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 09:04:10,747 INFO L225 Difference]: With dead ends: 28 [2020-12-09 09:04:10,747 INFO L226 Difference]: Without dead ends: 24 [2020-12-09 09:04:10,747 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=86, Invalid=154, Unknown=0, NotChecked=0, Total=240 [2020-12-09 09:04:10,748 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-12-09 09:04:10,751 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 20. [2020-12-09 09:04:10,751 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-12-09 09:04:10,751 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 26 transitions. [2020-12-09 09:04:10,751 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 26 transitions. Word has length 14 [2020-12-09 09:04:10,752 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 09:04:10,752 INFO L481 AbstractCegarLoop]: Abstraction has 20 states and 26 transitions. [2020-12-09 09:04:10,752 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-12-09 09:04:10,752 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 26 transitions. [2020-12-09 09:04:10,752 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-12-09 09:04:10,752 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 09:04:10,752 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-09 09:04:10,953 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 09:04:10,954 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-09 09:04:10,955 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 09:04:10,956 INFO L82 PathProgramCache]: Analyzing trace with hash -1580573581, now seen corresponding path program 1 times [2020-12-09 09:04:10,956 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 09:04:10,957 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1367053032] [2020-12-09 09:04:10,957 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 09:04:11,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 09:04:11,031 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-12-09 09:04:11,031 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1367053032] [2020-12-09 09:04:11,031 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2085010709] [2020-12-09 09:04:11,031 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_300fa637-0b3d-4fd9-b8cd-918406cad1a8/bin/utaipan/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 09:04:11,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 09:04:11,071 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 5 conjunts are in the unsatisfiable core [2020-12-09 09:04:11,072 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 09:04:11,082 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-12-09 09:04:11,083 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 09:04:11,103 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-12-09 09:04:11,103 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [459327450] [2020-12-09 09:04:11,105 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2020-12-09 09:04:11,105 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 09:04:11,105 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-09 09:04:11,105 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-09 09:04:11,105 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-09 09:04:11,674 INFO L180 IcfgInterpreter]: Interpretation finished [2020-12-09 09:04:11,933 WARN L197 SmtUtils]: Spent 183.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 50 [2020-12-09 09:04:12,238 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 3 imperfect interpolant sequences. [2020-12-09 09:04:12,238 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [3, 3, 3] total 15 [2020-12-09 09:04:12,239 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [481588200] [2020-12-09 09:04:12,239 INFO L461 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-12-09 09:04:12,239 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 09:04:12,240 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-12-09 09:04:12,240 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=154, Unknown=0, NotChecked=0, Total=240 [2020-12-09 09:04:12,240 INFO L87 Difference]: Start difference. First operand 20 states and 26 transitions. Second operand 11 states. [2020-12-09 09:04:12,300 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 09:04:12,300 INFO L93 Difference]: Finished difference Result 32 states and 44 transitions. [2020-12-09 09:04:12,300 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-12-09 09:04:12,300 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 16 [2020-12-09 09:04:12,300 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 09:04:12,301 INFO L225 Difference]: With dead ends: 32 [2020-12-09 09:04:12,301 INFO L226 Difference]: Without dead ends: 23 [2020-12-09 09:04:12,301 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 64 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=86, Invalid=154, Unknown=0, NotChecked=0, Total=240 [2020-12-09 09:04:12,302 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-12-09 09:04:12,305 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 21. [2020-12-09 09:04:12,305 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-12-09 09:04:12,305 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 27 transitions. [2020-12-09 09:04:12,305 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 27 transitions. Word has length 16 [2020-12-09 09:04:12,305 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 09:04:12,306 INFO L481 AbstractCegarLoop]: Abstraction has 21 states and 27 transitions. [2020-12-09 09:04:12,306 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-12-09 09:04:12,306 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 27 transitions. [2020-12-09 09:04:12,306 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-12-09 09:04:12,306 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 09:04:12,306 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-09 09:04:12,507 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 09:04:12,508 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-09 09:04:12,508 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 09:04:12,509 INFO L82 PathProgramCache]: Analyzing trace with hash 733568695, now seen corresponding path program 1 times [2020-12-09 09:04:12,509 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 09:04:12,510 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1620363279] [2020-12-09 09:04:12,510 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 09:04:12,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 09:04:12,557 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-12-09 09:04:12,557 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1620363279] [2020-12-09 09:04:12,557 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1738340240] [2020-12-09 09:04:12,557 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_300fa637-0b3d-4fd9-b8cd-918406cad1a8/bin/utaipan/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 09:04:12,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 09:04:12,598 INFO L263 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 5 conjunts are in the unsatisfiable core [2020-12-09 09:04:12,599 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 09:04:12,610 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-12-09 09:04:12,610 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 09:04:12,627 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-12-09 09:04:12,628 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [79557154] [2020-12-09 09:04:12,629 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2020-12-09 09:04:12,629 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 09:04:12,630 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-09 09:04:12,630 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-09 09:04:12,630 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-09 09:04:13,333 FATAL L? ?]: Ignoring exception! java.util.ConcurrentModificationException at java.base/java.util.HashMap.computeIfAbsent(HashMap.java:1134) at de.uni_freiburg.informatik.ultimate.lib.sifa.summarizers.FixpointLoopSummarizer.summarize(FixpointLoopSummarizer.java:94) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.ipretLoop(DagInterpreter.java:177) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.ipretNode(DagInterpreter.java:168) 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:289) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:189) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:179) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:84) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:74) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:511) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterateInternal(AbstractCegarLoop.java:438) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:372) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopResult.iterate(CegarLoopResult.java:138) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.iterateNew(TraceAbstractionStarter.java:345) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:198) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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) [2020-12-09 09:04:13,334 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 09:04:13,334 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2020-12-09 09:04:13,334 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1414413818] [2020-12-09 09:04:13,335 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-12-09 09:04:13,335 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 09:04:13,335 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-12-09 09:04:13,335 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=23, Unknown=0, NotChecked=0, Total=42 [2020-12-09 09:04:13,335 INFO L87 Difference]: Start difference. First operand 21 states and 27 transitions. Second operand 7 states. [2020-12-09 09:04:13,418 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 09:04:13,418 INFO L93 Difference]: Finished difference Result 77 states and 102 transitions. [2020-12-09 09:04:13,418 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-12-09 09:04:13,419 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 17 [2020-12-09 09:04:13,419 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 09:04:13,419 INFO L225 Difference]: With dead ends: 77 [2020-12-09 09:04:13,419 INFO L226 Difference]: Without dead ends: 59 [2020-12-09 09:04:13,420 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=26, Invalid=30, Unknown=0, NotChecked=0, Total=56 [2020-12-09 09:04:13,420 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2020-12-09 09:04:13,424 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 24. [2020-12-09 09:04:13,424 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-12-09 09:04:13,425 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 30 transitions. [2020-12-09 09:04:13,425 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 30 transitions. Word has length 17 [2020-12-09 09:04:13,425 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 09:04:13,425 INFO L481 AbstractCegarLoop]: Abstraction has 24 states and 30 transitions. [2020-12-09 09:04:13,425 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-12-09 09:04:13,425 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 30 transitions. [2020-12-09 09:04:13,425 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-12-09 09:04:13,425 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 09:04:13,426 INFO L422 BasicCegarLoop]: trace histogram [4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-09 09:04:13,626 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable83,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 09:04:13,627 INFO L429 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-09 09:04:13,628 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 09:04:13,629 INFO L82 PathProgramCache]: Analyzing trace with hash 976732365, now seen corresponding path program 2 times [2020-12-09 09:04:13,629 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 09:04:13,630 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [145920674] [2020-12-09 09:04:13,630 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 09:04:13,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 09:04:13,790 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-12-09 09:04:13,790 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [145920674] [2020-12-09 09:04:13,790 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [316801250] [2020-12-09 09:04:13,790 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_300fa637-0b3d-4fd9-b8cd-918406cad1a8/bin/utaipan/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 09:04:13,846 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2020-12-09 09:04:13,847 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-09 09:04:13,847 INFO L263 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 13 conjunts are in the unsatisfiable core [2020-12-09 09:04:13,849 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 09:04:13,912 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-12-09 09:04:13,912 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 09:04:13,971 WARN L234 Elim1Store]: Array PQE input equivalent to true [2020-12-09 09:04:14,008 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-12-09 09:04:14,008 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [940579466] [2020-12-09 09:04:14,009 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2020-12-09 09:04:14,009 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 09:04:14,010 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-09 09:04:14,010 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-09 09:04:14,010 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-09 09:04:14,587 FATAL L? ?]: Ignoring exception! java.util.ConcurrentModificationException at java.base/java.util.HashMap.computeIfAbsent(HashMap.java:1134) at de.uni_freiburg.informatik.ultimate.lib.sifa.summarizers.FixpointLoopSummarizer.summarize(FixpointLoopSummarizer.java:94) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.ipretLoop(DagInterpreter.java:177) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.ipretNode(DagInterpreter.java:168) 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:289) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:189) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:179) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:84) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:74) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:511) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterateInternal(AbstractCegarLoop.java:438) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:372) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopResult.iterate(CegarLoopResult.java:138) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.iterateNew(TraceAbstractionStarter.java:345) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:198) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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) [2020-12-09 09:04:14,588 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 09:04:14,588 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7, 7] total 17 [2020-12-09 09:04:14,588 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [886345038] [2020-12-09 09:04:14,588 INFO L461 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-12-09 09:04:14,588 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 09:04:14,589 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-12-09 09:04:14,589 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=222, Unknown=0, NotChecked=0, Total=272 [2020-12-09 09:04:14,589 INFO L87 Difference]: Start difference. First operand 24 states and 30 transitions. Second operand 17 states. [2020-12-09 09:04:15,047 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 09:04:15,047 INFO L93 Difference]: Finished difference Result 119 states and 152 transitions. [2020-12-09 09:04:15,047 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-12-09 09:04:15,048 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 20 [2020-12-09 09:04:15,048 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 09:04:15,048 INFO L225 Difference]: With dead ends: 119 [2020-12-09 09:04:15,048 INFO L226 Difference]: Without dead ends: 101 [2020-12-09 09:04:15,049 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 192 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=241, Invalid=949, Unknown=0, NotChecked=0, Total=1190 [2020-12-09 09:04:15,049 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2020-12-09 09:04:15,055 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 25. [2020-12-09 09:04:15,055 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-12-09 09:04:15,055 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 31 transitions. [2020-12-09 09:04:15,055 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 31 transitions. Word has length 20 [2020-12-09 09:04:15,055 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 09:04:15,056 INFO L481 AbstractCegarLoop]: Abstraction has 25 states and 31 transitions. [2020-12-09 09:04:15,056 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-12-09 09:04:15,056 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 31 transitions. [2020-12-09 09:04:15,056 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-12-09 09:04:15,056 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 09:04:15,056 INFO L422 BasicCegarLoop]: trace histogram [5, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-09 09:04:15,257 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable157 [2020-12-09 09:04:15,257 INFO L429 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-09 09:04:15,258 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 09:04:15,259 INFO L82 PathProgramCache]: Analyzing trace with hash 308821121, now seen corresponding path program 1 times [2020-12-09 09:04:15,259 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 09:04:15,260 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [795556131] [2020-12-09 09:04:15,260 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 09:04:15,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 09:04:15,358 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-12-09 09:04:15,359 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [795556131] [2020-12-09 09:04:15,359 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [45898493] [2020-12-09 09:04:15,359 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_300fa637-0b3d-4fd9-b8cd-918406cad1a8/bin/utaipan/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 09:04:15,394 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 09:04:15,395 INFO L263 TraceCheckSpWp]: Trace formula consists of 132 conjuncts, 14 conjunts are in the unsatisfiable core [2020-12-09 09:04:15,396 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 09:04:15,427 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-12-09 09:04:15,427 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 09:04:15,651 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-12-09 09:04:15,651 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1731079583] [2020-12-09 09:04:15,652 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2020-12-09 09:04:15,652 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 09:04:15,652 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-09 09:04:15,652 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-09 09:04:15,653 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-09 09:04:16,085 INFO L180 IcfgInterpreter]: Interpretation finished [2020-12-09 09:04:16,419 WARN L197 SmtUtils]: Spent 180.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 50 [2020-12-09 09:04:16,862 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 3 imperfect interpolant sequences. [2020-12-09 09:04:16,862 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [7, 7, 7] total 23 [2020-12-09 09:04:16,863 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [976611871] [2020-12-09 09:04:16,863 INFO L461 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-12-09 09:04:16,863 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 09:04:16,863 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-12-09 09:04:16,863 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=164, Invalid=388, Unknown=0, NotChecked=0, Total=552 [2020-12-09 09:04:16,864 INFO L87 Difference]: Start difference. First operand 25 states and 31 transitions. Second operand 11 states. [2020-12-09 09:04:16,994 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 09:04:16,995 INFO L93 Difference]: Finished difference Result 36 states and 45 transitions. [2020-12-09 09:04:16,995 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-12-09 09:04:16,995 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 21 [2020-12-09 09:04:16,995 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 09:04:16,995 INFO L225 Difference]: With dead ends: 36 [2020-12-09 09:04:16,996 INFO L226 Difference]: Without dead ends: 29 [2020-12-09 09:04:16,996 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 45 SyntacticMatches, 1 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 137 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=178, Invalid=422, Unknown=0, NotChecked=0, Total=600 [2020-12-09 09:04:16,996 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-12-09 09:04:17,002 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 28. [2020-12-09 09:04:17,003 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-12-09 09:04:17,003 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 34 transitions. [2020-12-09 09:04:17,003 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 34 transitions. Word has length 21 [2020-12-09 09:04:17,004 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 09:04:17,004 INFO L481 AbstractCegarLoop]: Abstraction has 28 states and 34 transitions. [2020-12-09 09:04:17,004 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-12-09 09:04:17,004 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 34 transitions. [2020-12-09 09:04:17,004 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-12-09 09:04:17,004 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 09:04:17,005 INFO L422 BasicCegarLoop]: trace histogram [5, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-09 09:04:17,205 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable225,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 09:04:17,206 INFO L429 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-09 09:04:17,207 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 09:04:17,207 INFO L82 PathProgramCache]: Analyzing trace with hash 779597918, now seen corresponding path program 1 times [2020-12-09 09:04:17,208 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 09:04:17,209 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2031694583] [2020-12-09 09:04:17,209 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 09:04:17,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 09:04:17,302 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-12-09 09:04:17,303 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2031694583] [2020-12-09 09:04:17,303 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [437270367] [2020-12-09 09:04:17,303 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_300fa637-0b3d-4fd9-b8cd-918406cad1a8/bin/utaipan/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 09:04:17,341 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 09:04:17,341 INFO L263 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 10 conjunts are in the unsatisfiable core [2020-12-09 09:04:17,343 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 09:04:17,374 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2020-12-09 09:04:17,374 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 09:04:17,409 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2020-12-09 09:04:17,410 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1183947557] [2020-12-09 09:04:17,412 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2020-12-09 09:04:17,412 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 09:04:17,412 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-09 09:04:17,412 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-09 09:04:17,412 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-09 09:04:18,126 INFO L180 IcfgInterpreter]: Interpretation finished [2020-12-09 09:04:18,338 WARN L197 SmtUtils]: Spent 172.00 ms on a formula simplification. DAG size of input: 91 DAG size of output: 66 [2020-12-09 09:04:18,641 WARN L197 SmtUtils]: Spent 212.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 50 [2020-12-09 09:04:18,925 WARN L197 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 47 [2020-12-09 09:04:19,148 WARN L197 SmtUtils]: Spent 172.00 ms on a formula simplification. DAG size of input: 78 DAG size of output: 59 [2020-12-09 09:04:19,473 WARN L197 SmtUtils]: Spent 184.00 ms on a formula simplification. DAG size of input: 82 DAG size of output: 63 [2020-12-09 09:04:19,800 WARN L197 SmtUtils]: Spent 242.00 ms on a formula simplification. DAG size of input: 90 DAG size of output: 71 [2020-12-09 09:04:19,801 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-12-09 09:04:19,801 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 09:04:19,801 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6, 4] total 12 [2020-12-09 09:04:19,801 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1614207507] [2020-12-09 09:04:19,801 INFO L461 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-12-09 09:04:19,802 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 09:04:19,802 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-12-09 09:04:19,802 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=385, Unknown=0, NotChecked=0, Total=462 [2020-12-09 09:04:19,802 INFO L87 Difference]: Start difference. First operand 28 states and 34 transitions. Second operand 12 states. [2020-12-09 09:04:20,390 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 09:04:20,391 INFO L93 Difference]: Finished difference Result 138 states and 208 transitions. [2020-12-09 09:04:20,391 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-12-09 09:04:20,391 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 22 [2020-12-09 09:04:20,391 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 09:04:20,392 INFO L225 Difference]: With dead ends: 138 [2020-12-09 09:04:20,392 INFO L226 Difference]: Without dead ends: 117 [2020-12-09 09:04:20,393 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 51 SyntacticMatches, 1 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 581 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=322, Invalid=1840, Unknown=0, NotChecked=0, Total=2162 [2020-12-09 09:04:20,393 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2020-12-09 09:04:20,400 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 30. [2020-12-09 09:04:20,400 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-12-09 09:04:20,401 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 35 transitions. [2020-12-09 09:04:20,401 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 35 transitions. Word has length 22 [2020-12-09 09:04:20,401 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 09:04:20,401 INFO L481 AbstractCegarLoop]: Abstraction has 30 states and 35 transitions. [2020-12-09 09:04:20,401 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-12-09 09:04:20,401 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 35 transitions. [2020-12-09 09:04:20,402 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-12-09 09:04:20,402 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 09:04:20,402 INFO L422 BasicCegarLoop]: trace histogram [6, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-09 09:04:20,602 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable252,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 09:04:20,602 INFO L429 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-09 09:04:20,603 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 09:04:20,603 INFO L82 PathProgramCache]: Analyzing trace with hash -578340201, now seen corresponding path program 2 times [2020-12-09 09:04:20,603 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 09:04:20,603 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2118760375] [2020-12-09 09:04:20,603 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 09:04:20,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 09:04:20,681 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2020-12-09 09:04:20,681 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2118760375] [2020-12-09 09:04:20,681 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2015078646] [2020-12-09 09:04:20,681 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_300fa637-0b3d-4fd9-b8cd-918406cad1a8/bin/utaipan/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 09:04:20,734 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2020-12-09 09:04:20,734 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-09 09:04:20,735 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 11 conjunts are in the unsatisfiable core [2020-12-09 09:04:20,736 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 09:04:20,769 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2020-12-09 09:04:20,769 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 09:04:20,814 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2020-12-09 09:04:20,814 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1808478425] [2020-12-09 09:04:20,816 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2020-12-09 09:04:20,816 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 09:04:20,816 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-09 09:04:20,816 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-09 09:04:20,816 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-09 09:04:21,487 INFO L180 IcfgInterpreter]: Interpretation finished [2020-12-09 09:04:21,715 WARN L197 SmtUtils]: Spent 175.00 ms on a formula simplification. DAG size of input: 91 DAG size of output: 66 [2020-12-09 09:04:22,003 WARN L197 SmtUtils]: Spent 195.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 50 [2020-12-09 09:04:22,302 WARN L197 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 47 [2020-12-09 09:04:22,545 WARN L197 SmtUtils]: Spent 189.00 ms on a formula simplification. DAG size of input: 78 DAG size of output: 59 [2020-12-09 09:04:22,915 WARN L197 SmtUtils]: Spent 206.00 ms on a formula simplification. DAG size of input: 82 DAG size of output: 63 [2020-12-09 09:04:23,236 WARN L197 SmtUtils]: Spent 234.00 ms on a formula simplification. DAG size of input: 90 DAG size of output: 71 [2020-12-09 09:04:23,237 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-12-09 09:04:23,237 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 09:04:23,237 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 5, 5] total 15 [2020-12-09 09:04:23,237 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1814225568] [2020-12-09 09:04:23,237 INFO L461 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-12-09 09:04:23,237 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 09:04:23,238 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-12-09 09:04:23,238 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=510, Unknown=0, NotChecked=0, Total=600 [2020-12-09 09:04:23,238 INFO L87 Difference]: Start difference. First operand 30 states and 35 transitions. Second operand 15 states. [2020-12-09 09:04:24,454 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 09:04:24,454 INFO L93 Difference]: Finished difference Result 451 states and 529 transitions. [2020-12-09 09:04:24,455 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2020-12-09 09:04:24,455 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 26 [2020-12-09 09:04:24,455 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 09:04:24,457 INFO L225 Difference]: With dead ends: 451 [2020-12-09 09:04:24,457 INFO L226 Difference]: Without dead ends: 429 [2020-12-09 09:04:24,458 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 61 SyntacticMatches, 0 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1278 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=516, Invalid=3774, Unknown=0, NotChecked=0, Total=4290 [2020-12-09 09:04:24,459 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 429 states. [2020-12-09 09:04:24,474 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 429 to 45. [2020-12-09 09:04:24,475 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-12-09 09:04:24,475 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 54 transitions. [2020-12-09 09:04:24,475 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 54 transitions. Word has length 26 [2020-12-09 09:04:24,475 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 09:04:24,475 INFO L481 AbstractCegarLoop]: Abstraction has 45 states and 54 transitions. [2020-12-09 09:04:24,475 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-12-09 09:04:24,475 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 54 transitions. [2020-12-09 09:04:24,476 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-12-09 09:04:24,476 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 09:04:24,476 INFO L422 BasicCegarLoop]: trace histogram [7, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-09 09:04:24,677 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable388 [2020-12-09 09:04:24,677 INFO L429 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-09 09:04:24,678 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 09:04:24,679 INFO L82 PathProgramCache]: Analyzing trace with hash 343292211, now seen corresponding path program 1 times [2020-12-09 09:04:24,679 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 09:04:24,679 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [177931567] [2020-12-09 09:04:24,680 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 09:04:24,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 09:04:24,801 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-12-09 09:04:24,801 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [177931567] [2020-12-09 09:04:24,801 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [114012449] [2020-12-09 09:04:24,801 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_300fa637-0b3d-4fd9-b8cd-918406cad1a8/bin/utaipan/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 09:04:24,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 09:04:24,850 INFO L263 TraceCheckSpWp]: Trace formula consists of 174 conjuncts, 14 conjunts are in the unsatisfiable core [2020-12-09 09:04:24,852 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 09:04:24,895 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 1 proven. 16 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2020-12-09 09:04:24,895 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 09:04:24,983 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2020-12-09 09:04:24,984 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2064716269] [2020-12-09 09:04:24,985 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2020-12-09 09:04:24,985 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 09:04:24,985 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-09 09:04:24,986 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-09 09:04:24,986 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-09 09:04:25,552 FATAL L? ?]: Ignoring exception! java.util.ConcurrentModificationException at java.base/java.util.HashMap.computeIfAbsent(HashMap.java:1134) at de.uni_freiburg.informatik.ultimate.lib.sifa.summarizers.FixpointLoopSummarizer.summarize(FixpointLoopSummarizer.java:94) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.ipretLoop(DagInterpreter.java:177) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.ipretNode(DagInterpreter.java:168) 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:289) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:189) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:179) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:84) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:74) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:511) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterateInternal(AbstractCegarLoop.java:438) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:372) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopResult.iterate(CegarLoopResult.java:138) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.iterateNew(TraceAbstractionStarter.java:345) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:198) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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) [2020-12-09 09:04:25,552 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 09:04:25,553 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 7, 5] total 16 [2020-12-09 09:04:25,553 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2138553037] [2020-12-09 09:04:25,553 INFO L461 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-12-09 09:04:25,553 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 09:04:25,554 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-12-09 09:04:25,554 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=195, Unknown=0, NotChecked=0, Total=240 [2020-12-09 09:04:25,554 INFO L87 Difference]: Start difference. First operand 45 states and 54 transitions. Second operand 16 states. [2020-12-09 09:04:27,625 WARN L197 SmtUtils]: Spent 138.00 ms on a formula simplification that was a NOOP. DAG size: 34 [2020-12-09 09:04:28,574 WARN L197 SmtUtils]: Spent 147.00 ms on a formula simplification that was a NOOP. DAG size: 38 [2020-12-09 09:04:29,398 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 09:04:29,398 INFO L93 Difference]: Finished difference Result 256 states and 356 transitions. [2020-12-09 09:04:29,399 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2020-12-09 09:04:29,399 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 31 [2020-12-09 09:04:29,399 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 09:04:29,400 INFO L225 Difference]: With dead ends: 256 [2020-12-09 09:04:29,400 INFO L226 Difference]: Without dead ends: 220 [2020-12-09 09:04:29,402 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 54 SyntacticMatches, 1 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1793 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=847, Invalid=4703, Unknown=0, NotChecked=0, Total=5550 [2020-12-09 09:04:29,402 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 220 states. [2020-12-09 09:04:29,422 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 220 to 56. [2020-12-09 09:04:29,423 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-12-09 09:04:29,423 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 65 transitions. [2020-12-09 09:04:29,423 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 65 transitions. Word has length 31 [2020-12-09 09:04:29,423 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 09:04:29,423 INFO L481 AbstractCegarLoop]: Abstraction has 56 states and 65 transitions. [2020-12-09 09:04:29,423 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-12-09 09:04:29,424 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 65 transitions. [2020-12-09 09:04:29,424 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-12-09 09:04:29,424 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 09:04:29,425 INFO L422 BasicCegarLoop]: trace histogram [8, 6, 5, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-09 09:04:29,625 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable523,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 09:04:29,626 INFO L429 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-09 09:04:29,627 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 09:04:29,627 INFO L82 PathProgramCache]: Analyzing trace with hash 1400912934, now seen corresponding path program 3 times [2020-12-09 09:04:29,628 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 09:04:29,628 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1005995899] [2020-12-09 09:04:29,628 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 09:04:29,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 09:04:29,750 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2020-12-09 09:04:29,750 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1005995899] [2020-12-09 09:04:29,750 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1952088441] [2020-12-09 09:04:29,750 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_300fa637-0b3d-4fd9-b8cd-918406cad1a8/bin/utaipan/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 09:04:29,791 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-09 09:04:29,792 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-09 09:04:29,793 INFO L263 TraceCheckSpWp]: Trace formula consists of 189 conjuncts, 22 conjunts are in the unsatisfiable core [2020-12-09 09:04:29,795 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 09:04:29,951 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 0 proven. 31 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2020-12-09 09:04:29,951 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 09:04:30,077 WARN L234 Elim1Store]: Array PQE input equivalent to true [2020-12-09 09:04:30,145 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 3 proven. 13 refuted. 0 times theorem prover too weak. 63 trivial. 0 not checked. [2020-12-09 09:04:30,145 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1449649138] [2020-12-09 09:04:30,146 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2020-12-09 09:04:30,146 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 09:04:30,147 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-09 09:04:30,147 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-09 09:04:30,147 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-09 09:04:30,796 INFO L180 IcfgInterpreter]: Interpretation finished [2020-12-09 09:04:31,078 WARN L197 SmtUtils]: Spent 193.00 ms on a formula simplification. DAG size of input: 91 DAG size of output: 66 [2020-12-09 09:04:31,412 WARN L197 SmtUtils]: Spent 207.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 50 [2020-12-09 09:04:31,770 WARN L197 SmtUtils]: Spent 154.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 47 [2020-12-09 09:04:32,046 WARN L197 SmtUtils]: Spent 189.00 ms on a formula simplification. DAG size of input: 78 DAG size of output: 59 [2020-12-09 09:04:32,446 WARN L197 SmtUtils]: Spent 200.00 ms on a formula simplification. DAG size of input: 82 DAG size of output: 63 [2020-12-09 09:04:32,804 WARN L197 SmtUtils]: Spent 242.00 ms on a formula simplification. DAG size of input: 90 DAG size of output: 71 [2020-12-09 09:04:32,805 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-12-09 09:04:32,805 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 09:04:32,805 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 11, 9] total 27 [2020-12-09 09:04:32,805 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1933467399] [2020-12-09 09:04:32,806 INFO L461 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-12-09 09:04:32,806 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 09:04:32,806 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-12-09 09:04:32,806 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=149, Invalid=1183, Unknown=0, NotChecked=0, Total=1332 [2020-12-09 09:04:32,807 INFO L87 Difference]: Start difference. First operand 56 states and 65 transitions. Second operand 27 states. [2020-12-09 09:04:34,760 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 09:04:34,760 INFO L93 Difference]: Finished difference Result 530 states and 597 transitions. [2020-12-09 09:04:34,761 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2020-12-09 09:04:34,761 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 36 [2020-12-09 09:04:34,761 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 09:04:34,763 INFO L225 Difference]: With dead ends: 530 [2020-12-09 09:04:34,763 INFO L226 Difference]: Without dead ends: 484 [2020-12-09 09:04:34,765 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 152 GetRequests, 81 SyntacticMatches, 0 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1287 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=537, Invalid=4719, Unknown=0, NotChecked=0, Total=5256 [2020-12-09 09:04:34,765 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 484 states. [2020-12-09 09:04:34,791 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 484 to 66. [2020-12-09 09:04:34,791 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-12-09 09:04:34,791 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 76 transitions. [2020-12-09 09:04:34,791 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 76 transitions. Word has length 36 [2020-12-09 09:04:34,791 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 09:04:34,791 INFO L481 AbstractCegarLoop]: Abstraction has 66 states and 76 transitions. [2020-12-09 09:04:34,792 INFO L482 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-12-09 09:04:34,792 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 76 transitions. [2020-12-09 09:04:34,792 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-12-09 09:04:34,792 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 09:04:34,792 INFO L422 BasicCegarLoop]: trace histogram [9, 6, 6, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-09 09:04:34,993 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable592,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 09:04:34,994 INFO L429 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-09 09:04:34,995 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 09:04:34,995 INFO L82 PathProgramCache]: Analyzing trace with hash -1431184877, now seen corresponding path program 2 times [2020-12-09 09:04:34,996 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 09:04:34,996 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [461202913] [2020-12-09 09:04:34,996 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 09:04:35,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 09:04:35,131 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2020-12-09 09:04:35,132 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [461202913] [2020-12-09 09:04:35,132 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1413336113] [2020-12-09 09:04:35,132 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_300fa637-0b3d-4fd9-b8cd-918406cad1a8/bin/utaipan/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 09:04:35,356 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2020-12-09 09:04:35,356 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-09 09:04:35,358 INFO L263 TraceCheckSpWp]: Trace formula consists of 204 conjuncts, 15 conjunts are in the unsatisfiable core [2020-12-09 09:04:35,359 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 09:04:35,448 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 2 proven. 21 refuted. 0 times theorem prover too weak. 69 trivial. 0 not checked. [2020-12-09 09:04:35,448 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 09:04:35,616 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 2 proven. 21 refuted. 0 times theorem prover too weak. 69 trivial. 0 not checked. [2020-12-09 09:04:35,616 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1407361962] [2020-12-09 09:04:35,617 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2020-12-09 09:04:35,617 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 09:04:35,617 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-09 09:04:35,617 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-09 09:04:35,618 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-09 09:04:36,181 FATAL L? ?]: Ignoring exception! java.util.ConcurrentModificationException at java.base/java.util.HashMap.computeIfAbsent(HashMap.java:1134) at de.uni_freiburg.informatik.ultimate.lib.sifa.summarizers.FixpointLoopSummarizer.summarize(FixpointLoopSummarizer.java:94) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.ipretLoop(DagInterpreter.java:177) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.ipretNode(DagInterpreter.java:168) 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:289) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:189) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:179) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:84) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:74) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:511) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterateInternal(AbstractCegarLoop.java:438) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:372) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopResult.iterate(CegarLoopResult.java:138) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.iterateNew(TraceAbstractionStarter.java:345) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:198) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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) [2020-12-09 09:04:36,181 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 09:04:36,181 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 9, 9] total 26 [2020-12-09 09:04:36,181 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [807221662] [2020-12-09 09:04:36,182 INFO L461 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-12-09 09:04:36,182 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 09:04:36,182 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-12-09 09:04:36,182 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=549, Unknown=0, NotChecked=0, Total=650 [2020-12-09 09:04:36,182 INFO L87 Difference]: Start difference. First operand 66 states and 76 transitions. Second operand 26 states. [2020-12-09 09:04:40,395 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 09:04:40,395 INFO L93 Difference]: Finished difference Result 402 states and 524 transitions. [2020-12-09 09:04:40,395 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 122 states. [2020-12-09 09:04:40,395 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 39 [2020-12-09 09:04:40,395 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 09:04:40,397 INFO L225 Difference]: With dead ends: 402 [2020-12-09 09:04:40,397 INFO L226 Difference]: Without dead ends: 347 [2020-12-09 09:04:40,403 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 281 GetRequests, 155 SyntacticMatches, 0 SemanticMatches, 126 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5456 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=1791, Invalid=14465, Unknown=0, NotChecked=0, Total=16256 [2020-12-09 09:04:40,403 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 347 states. [2020-12-09 09:04:40,431 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 347 to 79. [2020-12-09 09:04:40,431 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2020-12-09 09:04:40,432 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 89 transitions. [2020-12-09 09:04:40,432 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 89 transitions. Word has length 39 [2020-12-09 09:04:40,432 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 09:04:40,432 INFO L481 AbstractCegarLoop]: Abstraction has 79 states and 89 transitions. [2020-12-09 09:04:40,432 INFO L482 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-12-09 09:04:40,432 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 89 transitions. [2020-12-09 09:04:40,433 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-12-09 09:04:40,433 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 09:04:40,433 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 8, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-09 09:04:40,633 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable711 [2020-12-09 09:04:40,634 INFO L429 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-09 09:04:40,635 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 09:04:40,635 INFO L82 PathProgramCache]: Analyzing trace with hash -121823319, now seen corresponding path program 3 times [2020-12-09 09:04:40,635 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 09:04:40,636 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1850582522] [2020-12-09 09:04:40,636 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 09:04:41,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-12-09 09:04:41,072 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-12-09 09:04:41,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-12-09 09:04:41,374 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-12-09 09:04:41,401 INFO L173 FreeRefinementEngine]: Strategy SIFA_TAIPAN found a feasible trace [2020-12-09 09:04:41,401 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-12-09 09:04:41,402 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable785 [2020-12-09 09:04:41,452 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 09.12 09:04:41 BoogieIcfgContainer [2020-12-09 09:04:41,453 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-12-09 09:04:41,453 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-12-09 09:04:41,453 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-12-09 09:04:41,453 INFO L275 PluginConnector]: Witness Printer initialized [2020-12-09 09:04:41,453 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.12 09:04:06" (3/4) ... [2020-12-09 09:04:41,455 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2020-12-09 09:04:41,492 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/run_dir_300fa637-0b3d-4fd9-b8cd-918406cad1a8/bin/utaipan/witness.graphml [2020-12-09 09:04:41,492 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-12-09 09:04:41,493 INFO L168 Benchmark]: Toolchain (without parser) took 35298.75 ms. Allocated memory was 88.1 MB in the beginning and 174.1 MB in the end (delta: 86.0 MB). Free memory was 49.6 MB in the beginning and 104.3 MB in the end (delta: -54.8 MB). Peak memory consumption was 32.1 MB. Max. memory is 16.1 GB. [2020-12-09 09:04:41,493 INFO L168 Benchmark]: CDTParser took 0.13 ms. Allocated memory is still 88.1 MB. Free memory was 65.9 MB in the beginning and 65.8 MB in the end (delta: 115.4 kB). There was no memory consumed. Max. memory is 16.1 GB. [2020-12-09 09:04:41,493 INFO L168 Benchmark]: CACSL2BoogieTranslator took 177.09 ms. Allocated memory is still 88.1 MB. Free memory was 49.3 MB in the beginning and 61.1 MB in the end (delta: -11.7 MB). Peak memory consumption was 6.9 MB. Max. memory is 16.1 GB. [2020-12-09 09:04:41,493 INFO L168 Benchmark]: Boogie Procedure Inliner took 34.05 ms. Allocated memory is still 88.1 MB. Free memory was 61.1 MB in the beginning and 59.2 MB in the end (delta: 1.8 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-12-09 09:04:41,494 INFO L168 Benchmark]: Boogie Preprocessor took 24.12 ms. Allocated memory is still 88.1 MB. Free memory was 59.2 MB in the beginning and 58.0 MB in the end (delta: 1.3 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-12-09 09:04:41,494 INFO L168 Benchmark]: RCFGBuilder took 355.58 ms. Allocated memory is still 88.1 MB. Free memory was 58.0 MB in the beginning and 48.8 MB in the end (delta: 9.1 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. [2020-12-09 09:04:41,494 INFO L168 Benchmark]: TraceAbstraction took 34662.95 ms. Allocated memory was 88.1 MB in the beginning and 174.1 MB in the end (delta: 86.0 MB). Free memory was 48.4 MB in the beginning and 109.6 MB in the end (delta: -61.1 MB). Peak memory consumption was 92.4 MB. Max. memory is 16.1 GB. [2020-12-09 09:04:41,494 INFO L168 Benchmark]: Witness Printer took 39.19 ms. Allocated memory is still 174.1 MB. Free memory was 109.6 MB in the beginning and 104.3 MB in the end (delta: 5.2 MB). Peak memory consumption was 4.2 MB. Max. memory is 16.1 GB. [2020-12-09 09:04:41,496 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.13 ms. Allocated memory is still 88.1 MB. Free memory was 65.9 MB in the beginning and 65.8 MB in the end (delta: 115.4 kB). There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 177.09 ms. Allocated memory is still 88.1 MB. Free memory was 49.3 MB in the beginning and 61.1 MB in the end (delta: -11.7 MB). Peak memory consumption was 6.9 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 34.05 ms. Allocated memory is still 88.1 MB. Free memory was 61.1 MB in the beginning and 59.2 MB in the end (delta: 1.8 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Boogie Preprocessor took 24.12 ms. Allocated memory is still 88.1 MB. Free memory was 59.2 MB in the beginning and 58.0 MB in the end (delta: 1.3 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * RCFGBuilder took 355.58 ms. Allocated memory is still 88.1 MB. Free memory was 58.0 MB in the beginning and 48.8 MB in the end (delta: 9.1 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. * TraceAbstraction took 34662.95 ms. Allocated memory was 88.1 MB in the beginning and 174.1 MB in the end (delta: 86.0 MB). Free memory was 48.4 MB in the beginning and 109.6 MB in the end (delta: -61.1 MB). Peak memory consumption was 92.4 MB. Max. memory is 16.1 GB. * Witness Printer took 39.19 ms. Allocated memory is still 174.1 MB. Free memory was 109.6 MB in the beginning and 104.3 MB in the end (delta: 5.2 MB). Peak memory consumption was 4.2 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 16]: a call to reach_error is reachable a call to reach_error is reachable We found a FailurePath: [L26] char string_entrada[10], vetor_vogais[]={'a','A','e','E','i','I','o','O','u','U','\0'}; [L27] unsigned int i,j,cont, tam_string, n_caracter; [L29] i=0 [L29] COND TRUE i<10 [L30] string_entrada[i] = __VERIFIER_nondet_char() [L29] i++ [L29] COND TRUE i<10 [L30] string_entrada[i] = __VERIFIER_nondet_char() [L29] i++ [L29] COND TRUE i<10 [L30] string_entrada[i] = __VERIFIER_nondet_char() [L29] i++ [L29] COND TRUE i<10 [L30] string_entrada[i] = __VERIFIER_nondet_char() [L29] i++ [L29] COND TRUE i<10 [L30] string_entrada[i] = __VERIFIER_nondet_char() [L29] i++ [L29] COND TRUE i<10 [L30] string_entrada[i] = __VERIFIER_nondet_char() [L29] i++ [L29] COND TRUE i<10 [L30] string_entrada[i] = __VERIFIER_nondet_char() [L29] i++ [L29] COND TRUE i<10 [L30] string_entrada[i] = __VERIFIER_nondet_char() [L29] i++ [L29] COND TRUE i<10 [L30] string_entrada[i] = __VERIFIER_nondet_char() [L29] i++ [L29] COND TRUE i<10 [L30] string_entrada[i] = __VERIFIER_nondet_char() [L29] i++ [L29] COND FALSE !(i<10) [L32] string_entrada[10 -1]='\0' [L34] n_caracter = 0 [L35] EXPR string_entrada[n_caracter] [L35] COND TRUE string_entrada[n_caracter]!='\0' [L36] n_caracter++ [L35] EXPR string_entrada[n_caracter] [L35] COND FALSE !(string_entrada[n_caracter]!='\0') [L38] cont = 0 [L39] i=0 [L39] COND TRUE i