./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/array-memsafety/openbsd_cstrlen-alloca-1.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version a4ecdabc Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/run_dir_81c6220f-3d32-4594-b91e-bad073ac52d8/bin/utaipan/data/config -Xmx15G -Xms4m -jar /tmp/vcloud-vcloud-master/worker/run_dir_81c6220f-3d32-4594-b91e-bad073ac52d8/bin/utaipan/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_81c6220f-3d32-4594-b91e-bad073ac52d8/bin/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_81c6220f-3d32-4594-b91e-bad073ac52d8/bin/utaipan/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/array-memsafety/openbsd_cstrlen-alloca-1.i -s /tmp/vcloud-vcloud-master/worker/run_dir_81c6220f-3d32-4594-b91e-bad073ac52d8/bin/utaipan/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_81c6220f-3d32-4594-b91e-bad073ac52d8/bin/utaipan --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash b812e7d14425eea3a24125f5e2db40eadfc6c14c ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ Execution finished normally Writing output log to file Ultimate.log Result: TRUE --- Real Ultimate output --- This is Ultimate 0.2.0-a4ecdab [2020-11-28 07:43:36,441 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-11-28 07:43:36,444 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-11-28 07:43:36,509 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-11-28 07:43:36,521 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-11-28 07:43:36,526 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-11-28 07:43:36,528 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-11-28 07:43:36,549 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-11-28 07:43:36,551 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-11-28 07:43:36,557 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-11-28 07:43:36,559 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-11-28 07:43:36,561 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-11-28 07:43:36,561 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-11-28 07:43:36,565 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-11-28 07:43:36,567 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-11-28 07:43:36,569 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-11-28 07:43:36,570 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-11-28 07:43:36,574 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-11-28 07:43:36,577 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-11-28 07:43:36,585 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-11-28 07:43:36,587 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-11-28 07:43:36,589 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-11-28 07:43:36,591 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-11-28 07:43:36,592 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-11-28 07:43:36,601 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-11-28 07:43:36,601 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-11-28 07:43:36,602 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-11-28 07:43:36,603 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-11-28 07:43:36,603 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-11-28 07:43:36,605 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-11-28 07:43:36,605 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-11-28 07:43:36,606 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-11-28 07:43:36,607 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-11-28 07:43:36,608 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-11-28 07:43:36,609 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-11-28 07:43:36,609 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-11-28 07:43:36,610 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-11-28 07:43:36,610 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-11-28 07:43:36,610 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-11-28 07:43:36,611 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-11-28 07:43:36,612 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-11-28 07:43:36,615 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/run_dir_81c6220f-3d32-4594-b91e-bad073ac52d8/bin/utaipan/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2020-11-28 07:43:36,654 INFO L113 SettingsManager]: Loading preferences was successful [2020-11-28 07:43:36,654 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-11-28 07:43:36,656 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2020-11-28 07:43:36,656 INFO L138 SettingsManager]: * User list type=DISABLED [2020-11-28 07:43:36,656 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2020-11-28 07:43:36,656 INFO L138 SettingsManager]: * Explicit value domain=true [2020-11-28 07:43:36,657 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2020-11-28 07:43:36,657 INFO L138 SettingsManager]: * Octagon Domain=false [2020-11-28 07:43:36,657 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2020-11-28 07:43:36,657 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2020-11-28 07:43:36,658 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2020-11-28 07:43:36,659 INFO L138 SettingsManager]: * Interval Domain=false [2020-11-28 07:43:36,659 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2020-11-28 07:43:36,659 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2020-11-28 07:43:36,659 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2020-11-28 07:43:36,660 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-11-28 07:43:36,660 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-11-28 07:43:36,661 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-11-28 07:43:36,661 INFO L138 SettingsManager]: * sizeof long=4 [2020-11-28 07:43:36,661 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2020-11-28 07:43:36,661 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-11-28 07:43:36,662 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-11-28 07:43:36,662 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-11-28 07:43:36,662 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2020-11-28 07:43:36,662 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2020-11-28 07:43:36,663 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2020-11-28 07:43:36,664 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-11-28 07:43:36,664 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2020-11-28 07:43:36,665 INFO L138 SettingsManager]: * sizeof long double=12 [2020-11-28 07:43:36,665 INFO L138 SettingsManager]: * Use constant arrays=true [2020-11-28 07:43:36,665 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-11-28 07:43:36,666 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-11-28 07:43:36,666 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-11-28 07:43:36,666 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-11-28 07:43:36,666 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-11-28 07:43:36,667 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-11-28 07:43:36,667 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2020-11-28 07:43:36,667 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-11-28 07:43:36,667 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-11-28 07:43:36,668 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2020-11-28 07:43:36,668 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_81c6220f-3d32-4594-b91e-bad073ac52d8/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud-vcloud-master/worker/run_dir_81c6220f-3d32-4594-b91e-bad073ac52d8/bin/utaipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> b812e7d14425eea3a24125f5e2db40eadfc6c14c [2020-11-28 07:43:36,978 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-11-28 07:43:37,016 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-11-28 07:43:37,020 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-11-28 07:43:37,021 INFO L271 PluginConnector]: Initializing CDTParser... [2020-11-28 07:43:37,022 INFO L275 PluginConnector]: CDTParser initialized [2020-11-28 07:43:37,023 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_81c6220f-3d32-4594-b91e-bad073ac52d8/bin/utaipan/../../sv-benchmarks/c/array-memsafety/openbsd_cstrlen-alloca-1.i [2020-11-28 07:43:37,110 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_81c6220f-3d32-4594-b91e-bad073ac52d8/bin/utaipan/data/6e079783d/84ca38ab66cc4795952f24adc76b55ef/FLAG308a90749 [2020-11-28 07:43:37,725 INFO L306 CDTParser]: Found 1 translation units. [2020-11-28 07:43:37,725 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_81c6220f-3d32-4594-b91e-bad073ac52d8/sv-benchmarks/c/array-memsafety/openbsd_cstrlen-alloca-1.i [2020-11-28 07:43:37,753 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_81c6220f-3d32-4594-b91e-bad073ac52d8/bin/utaipan/data/6e079783d/84ca38ab66cc4795952f24adc76b55ef/FLAG308a90749 [2020-11-28 07:43:38,037 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_81c6220f-3d32-4594-b91e-bad073ac52d8/bin/utaipan/data/6e079783d/84ca38ab66cc4795952f24adc76b55ef [2020-11-28 07:43:38,046 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-11-28 07:43:38,048 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-11-28 07:43:38,050 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-11-28 07:43:38,051 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-11-28 07:43:38,054 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-11-28 07:43:38,055 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 28.11 07:43:38" (1/1) ... [2020-11-28 07:43:38,058 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3feff18f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:43:38, skipping insertion in model container [2020-11-28 07:43:38,058 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 28.11 07:43:38" (1/1) ... [2020-11-28 07:43:38,066 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-11-28 07:43:38,124 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-11-28 07:43:38,414 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-28 07:43:38,422 INFO L203 MainTranslator]: Completed pre-run [2020-11-28 07:43:38,495 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-28 07:43:38,550 INFO L208 MainTranslator]: Completed translation [2020-11-28 07:43:38,551 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:43:38 WrapperNode [2020-11-28 07:43:38,551 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-11-28 07:43:38,552 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-11-28 07:43:38,553 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-11-28 07:43:38,553 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-11-28 07:43:38,561 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:43:38" (1/1) ... [2020-11-28 07:43:38,575 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:43:38" (1/1) ... [2020-11-28 07:43:38,597 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-11-28 07:43:38,598 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-11-28 07:43:38,598 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-11-28 07:43:38,598 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-11-28 07:43:38,607 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:43:38" (1/1) ... [2020-11-28 07:43:38,607 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:43:38" (1/1) ... [2020-11-28 07:43:38,610 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:43:38" (1/1) ... [2020-11-28 07:43:38,611 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:43:38" (1/1) ... [2020-11-28 07:43:38,617 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:43:38" (1/1) ... [2020-11-28 07:43:38,620 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:43:38" (1/1) ... [2020-11-28 07:43:38,622 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:43:38" (1/1) ... [2020-11-28 07:43:38,625 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-11-28 07:43:38,626 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-11-28 07:43:38,626 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-11-28 07:43:38,626 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-11-28 07:43:38,627 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:43:38" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_81c6220f-3d32-4594-b91e-bad073ac52d8/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 [2020-11-28 07:43:38,704 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-11-28 07:43:38,704 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-11-28 07:43:38,704 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-11-28 07:43:38,704 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-11-28 07:43:38,705 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-11-28 07:43:38,705 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-11-28 07:43:39,311 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-11-28 07:43:39,311 INFO L298 CfgBuilder]: Removed 8 assume(true) statements. [2020-11-28 07:43:39,313 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.11 07:43:39 BoogieIcfgContainer [2020-11-28 07:43:39,313 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-11-28 07:43:39,315 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-11-28 07:43:39,315 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-11-28 07:43:39,318 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-11-28 07:43:39,319 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 28.11 07:43:38" (1/3) ... [2020-11-28 07:43:39,319 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7add79d4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 28.11 07:43:39, skipping insertion in model container [2020-11-28 07:43:39,319 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:43:38" (2/3) ... [2020-11-28 07:43:39,320 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7add79d4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 28.11 07:43:39, skipping insertion in model container [2020-11-28 07:43:39,320 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.11 07:43:39" (3/3) ... [2020-11-28 07:43:39,321 INFO L111 eAbstractionObserver]: Analyzing ICFG openbsd_cstrlen-alloca-1.i [2020-11-28 07:43:39,332 INFO L164 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-11-28 07:43:39,336 INFO L176 ceAbstractionStarter]: Appying trace abstraction to program that has 7 error locations. [2020-11-28 07:43:39,347 INFO L253 AbstractCegarLoop]: Starting to check reachability of 7 error locations. [2020-11-28 07:43:39,374 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-11-28 07:43:39,374 INFO L378 AbstractCegarLoop]: Hoare is false [2020-11-28 07:43:39,374 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-11-28 07:43:39,375 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-11-28 07:43:39,375 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-11-28 07:43:39,375 INFO L382 AbstractCegarLoop]: Difference is false [2020-11-28 07:43:39,375 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-11-28 07:43:39,375 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-11-28 07:43:39,385 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states. [2020-11-28 07:43:39,390 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2020-11-28 07:43:39,390 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 07:43:39,391 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1] [2020-11-28 07:43:39,391 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr6ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr5REQUIRES_VIOLATION, ULTIMATE.startErr4REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION]=== [2020-11-28 07:43:39,396 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 07:43:39,396 INFO L82 PathProgramCache]: Analyzing trace with hash 91841, now seen corresponding path program 1 times [2020-11-28 07:43:39,406 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-28 07:43:39,406 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [841242099] [2020-11-28 07:43:39,406 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 07:43:39,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 07:43:39,555 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 07:43:39,556 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [841242099] [2020-11-28 07:43:39,556 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-28 07:43:39,557 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2020-11-28 07:43:39,557 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [553498182] [2020-11-28 07:43:39,561 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-11-28 07:43:39,561 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-28 07:43:39,574 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-11-28 07:43:39,574 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-11-28 07:43:39,576 INFO L87 Difference]: Start difference. First operand 16 states. Second operand 3 states. [2020-11-28 07:43:39,625 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 07:43:39,625 INFO L93 Difference]: Finished difference Result 14 states and 15 transitions. [2020-11-28 07:43:39,626 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-11-28 07:43:39,627 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 3 [2020-11-28 07:43:39,627 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-28 07:43:39,633 INFO L225 Difference]: With dead ends: 14 [2020-11-28 07:43:39,633 INFO L226 Difference]: Without dead ends: 13 [2020-11-28 07:43:39,634 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-11-28 07:43:39,650 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2020-11-28 07:43:39,660 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2020-11-28 07:43:39,661 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2020-11-28 07:43:39,662 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2020-11-28 07:43:39,663 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 3 [2020-11-28 07:43:39,663 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-28 07:43:39,663 INFO L481 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2020-11-28 07:43:39,663 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-11-28 07:43:39,663 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2020-11-28 07:43:39,663 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2020-11-28 07:43:39,664 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 07:43:39,664 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1] [2020-11-28 07:43:39,664 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-11-28 07:43:39,664 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr6ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr5REQUIRES_VIOLATION, ULTIMATE.startErr4REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION]=== [2020-11-28 07:43:39,665 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 07:43:39,665 INFO L82 PathProgramCache]: Analyzing trace with hash 91842, now seen corresponding path program 1 times [2020-11-28 07:43:39,665 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-28 07:43:39,665 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [838463133] [2020-11-28 07:43:39,666 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 07:43:39,681 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 07:43:39,764 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 07:43:39,765 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [838463133] [2020-11-28 07:43:39,765 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-28 07:43:39,765 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-11-28 07:43:39,765 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1605239062] [2020-11-28 07:43:39,766 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-11-28 07:43:39,767 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-28 07:43:39,767 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-11-28 07:43:39,768 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-11-28 07:43:39,768 INFO L87 Difference]: Start difference. First operand 13 states and 14 transitions. Second operand 4 states. [2020-11-28 07:43:39,875 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 07:43:39,875 INFO L93 Difference]: Finished difference Result 24 states and 26 transitions. [2020-11-28 07:43:39,876 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-11-28 07:43:39,876 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 3 [2020-11-28 07:43:39,876 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-28 07:43:39,877 INFO L225 Difference]: With dead ends: 24 [2020-11-28 07:43:39,877 INFO L226 Difference]: Without dead ends: 24 [2020-11-28 07:43:39,878 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-11-28 07:43:39,878 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-11-28 07:43:39,882 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 15. [2020-11-28 07:43:39,882 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-11-28 07:43:39,883 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2020-11-28 07:43:39,884 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 3 [2020-11-28 07:43:39,884 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-28 07:43:39,884 INFO L481 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2020-11-28 07:43:39,884 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-11-28 07:43:39,885 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2020-11-28 07:43:39,885 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2020-11-28 07:43:39,885 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 07:43:39,886 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1] [2020-11-28 07:43:39,886 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-11-28 07:43:39,886 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr6ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr5REQUIRES_VIOLATION, ULTIMATE.startErr4REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION]=== [2020-11-28 07:43:39,887 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 07:43:39,887 INFO L82 PathProgramCache]: Analyzing trace with hash 93215, now seen corresponding path program 1 times [2020-11-28 07:43:39,889 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-28 07:43:39,891 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1440362810] [2020-11-28 07:43:39,892 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 07:43:39,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 07:43:40,011 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 07:43:40,012 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1440362810] [2020-11-28 07:43:40,012 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-28 07:43:40,012 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2020-11-28 07:43:40,012 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1574940843] [2020-11-28 07:43:40,012 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-11-28 07:43:40,013 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-28 07:43:40,013 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-11-28 07:43:40,014 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-11-28 07:43:40,014 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand 3 states. [2020-11-28 07:43:40,041 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 07:43:40,041 INFO L93 Difference]: Finished difference Result 14 states and 16 transitions. [2020-11-28 07:43:40,043 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-11-28 07:43:40,043 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 3 [2020-11-28 07:43:40,043 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-28 07:43:40,043 INFO L225 Difference]: With dead ends: 14 [2020-11-28 07:43:40,044 INFO L226 Difference]: Without dead ends: 14 [2020-11-28 07:43:40,044 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-11-28 07:43:40,044 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-11-28 07:43:40,046 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-11-28 07:43:40,046 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-11-28 07:43:40,046 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 16 transitions. [2020-11-28 07:43:40,046 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 16 transitions. Word has length 3 [2020-11-28 07:43:40,047 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-28 07:43:40,047 INFO L481 AbstractCegarLoop]: Abstraction has 14 states and 16 transitions. [2020-11-28 07:43:40,047 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-11-28 07:43:40,047 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 16 transitions. [2020-11-28 07:43:40,047 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2020-11-28 07:43:40,047 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 07:43:40,048 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2020-11-28 07:43:40,048 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-11-28 07:43:40,048 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr6ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr5REQUIRES_VIOLATION, ULTIMATE.startErr4REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION]=== [2020-11-28 07:43:40,048 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 07:43:40,049 INFO L82 PathProgramCache]: Analyzing trace with hash 2890506, now seen corresponding path program 1 times [2020-11-28 07:43:40,049 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-28 07:43:40,049 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [578937215] [2020-11-28 07:43:40,049 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 07:43:40,076 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 07:43:40,092 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 07:43:40,093 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [578937215] [2020-11-28 07:43:40,093 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-28 07:43:40,093 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-11-28 07:43:40,093 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [387120532] [2020-11-28 07:43:40,094 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-11-28 07:43:40,094 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-28 07:43:40,094 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-11-28 07:43:40,095 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-11-28 07:43:40,095 INFO L87 Difference]: Start difference. First operand 14 states and 16 transitions. Second operand 3 states. [2020-11-28 07:43:40,118 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 07:43:40,118 INFO L93 Difference]: Finished difference Result 13 states and 15 transitions. [2020-11-28 07:43:40,119 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-11-28 07:43:40,119 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 4 [2020-11-28 07:43:40,119 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-28 07:43:40,120 INFO L225 Difference]: With dead ends: 13 [2020-11-28 07:43:40,120 INFO L226 Difference]: Without dead ends: 13 [2020-11-28 07:43:40,120 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 [2020-11-28 07:43:40,120 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2020-11-28 07:43:40,122 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2020-11-28 07:43:40,122 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2020-11-28 07:43:40,122 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 15 transitions. [2020-11-28 07:43:40,122 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 15 transitions. Word has length 4 [2020-11-28 07:43:40,123 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-28 07:43:40,123 INFO L481 AbstractCegarLoop]: Abstraction has 13 states and 15 transitions. [2020-11-28 07:43:40,123 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-11-28 07:43:40,123 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 15 transitions. [2020-11-28 07:43:40,123 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2020-11-28 07:43:40,123 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 07:43:40,124 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2020-11-28 07:43:40,124 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-11-28 07:43:40,124 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr6ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr5REQUIRES_VIOLATION, ULTIMATE.startErr4REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION]=== [2020-11-28 07:43:40,124 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 07:43:40,125 INFO L82 PathProgramCache]: Analyzing trace with hash 2890507, now seen corresponding path program 1 times [2020-11-28 07:43:40,125 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-28 07:43:40,125 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [114516872] [2020-11-28 07:43:40,125 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 07:43:40,157 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 07:43:40,196 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 07:43:40,197 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [114516872] [2020-11-28 07:43:40,197 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-28 07:43:40,197 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-11-28 07:43:40,197 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [673112940] [2020-11-28 07:43:40,198 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-11-28 07:43:40,198 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-28 07:43:40,198 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-11-28 07:43:40,199 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-11-28 07:43:40,199 INFO L87 Difference]: Start difference. First operand 13 states and 15 transitions. Second operand 4 states. [2020-11-28 07:43:40,251 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 07:43:40,251 INFO L93 Difference]: Finished difference Result 14 states and 16 transitions. [2020-11-28 07:43:40,252 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-11-28 07:43:40,252 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 4 [2020-11-28 07:43:40,252 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-28 07:43:40,253 INFO L225 Difference]: With dead ends: 14 [2020-11-28 07:43:40,253 INFO L226 Difference]: Without dead ends: 14 [2020-11-28 07:43:40,253 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-11-28 07:43:40,253 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-11-28 07:43:40,255 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-11-28 07:43:40,255 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-11-28 07:43:40,255 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 16 transitions. [2020-11-28 07:43:40,256 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 16 transitions. Word has length 4 [2020-11-28 07:43:40,256 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-28 07:43:40,256 INFO L481 AbstractCegarLoop]: Abstraction has 14 states and 16 transitions. [2020-11-28 07:43:40,256 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-11-28 07:43:40,256 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 16 transitions. [2020-11-28 07:43:40,256 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2020-11-28 07:43:40,257 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 07:43:40,257 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1] [2020-11-28 07:43:40,257 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-11-28 07:43:40,257 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr6ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr5REQUIRES_VIOLATION, ULTIMATE.startErr4REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION]=== [2020-11-28 07:43:40,257 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 07:43:40,258 INFO L82 PathProgramCache]: Analyzing trace with hash 88298188, now seen corresponding path program 1 times [2020-11-28 07:43:40,258 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-28 07:43:40,258 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1805108425] [2020-11-28 07:43:40,258 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 07:43:40,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 07:43:40,355 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 07:43:40,355 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1805108425] [2020-11-28 07:43:40,355 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [221188938] [2020-11-28 07:43:40,356 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_81c6220f-3d32-4594-b91e-bad073ac52d8/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 [2020-11-28 07:43:40,417 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 07:43:40,419 INFO L263 TraceCheckSpWp]: Trace formula consists of 39 conjuncts, 11 conjunts are in the unsatisfiable core [2020-11-28 07:43:40,424 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 07:43:40,485 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2020-11-28 07:43:40,486 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-11-28 07:43:40,499 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-11-28 07:43:40,500 INFO L545 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2020-11-28 07:43:40,500 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:13, output treesize:12 [2020-11-28 07:43:40,547 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 07:43:40,547 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-28 07:43:40,596 INFO L603 QuantifierPusher]: Distributing 2 disjuncts over 3 conjuncts [2020-11-28 07:43:40,628 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 07:43:40,629 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1888162522] [2020-11-28 07:43:40,649 INFO L159 IcfgInterpreter]: Started Sifa with 4 locations of interest [2020-11-28 07:43:40,649 INFO L166 IcfgInterpreter]: Building call graph [2020-11-28 07:43:40,657 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-11-28 07:43:40,662 INFO L176 IcfgInterpreter]: Starting interpretation [2020-11-28 07:43:40,662 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-11-28 07:43:40,877 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-11-28 07:43:41,101 INFO L180 IcfgInterpreter]: Interpretation finished [2020-11-28 07:43:41,406 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-11-28 07:43:41,407 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-28 07:43:41,407 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 7 [2020-11-28 07:43:41,407 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [522432060] [2020-11-28 07:43:41,407 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-11-28 07:43:41,408 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-28 07:43:41,408 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-11-28 07:43:41,409 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=97, Unknown=0, NotChecked=0, Total=132 [2020-11-28 07:43:41,409 INFO L87 Difference]: Start difference. First operand 14 states and 16 transitions. Second operand 9 states. [2020-11-28 07:43:41,562 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 07:43:41,562 INFO L93 Difference]: Finished difference Result 30 states and 33 transitions. [2020-11-28 07:43:41,563 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-11-28 07:43:41,563 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 5 [2020-11-28 07:43:41,563 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-28 07:43:41,563 INFO L225 Difference]: With dead ends: 30 [2020-11-28 07:43:41,563 INFO L226 Difference]: Without dead ends: 30 [2020-11-28 07:43:41,564 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 5 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2020-11-28 07:43:41,564 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-11-28 07:43:41,566 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 11. [2020-11-28 07:43:41,566 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2020-11-28 07:43:41,566 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 12 transitions. [2020-11-28 07:43:41,566 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 12 transitions. Word has length 5 [2020-11-28 07:43:41,567 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-28 07:43:41,567 INFO L481 AbstractCegarLoop]: Abstraction has 11 states and 12 transitions. [2020-11-28 07:43:41,567 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-11-28 07:43:41,567 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 12 transitions. [2020-11-28 07:43:41,567 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2020-11-28 07:43:41,567 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 07:43:41,567 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2020-11-28 07:43:41,780 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2020-11-28 07:43:41,780 INFO L429 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr6ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr5REQUIRES_VIOLATION, ULTIMATE.startErr4REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION]=== [2020-11-28 07:43:41,781 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 07:43:41,781 INFO L82 PathProgramCache]: Analyzing trace with hash -1517190188, now seen corresponding path program 1 times [2020-11-28 07:43:41,781 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-28 07:43:41,781 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [963234409] [2020-11-28 07:43:41,781 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 07:43:41,796 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 07:43:41,891 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 07:43:41,891 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [963234409] [2020-11-28 07:43:41,891 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-28 07:43:41,891 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-11-28 07:43:41,892 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1857920889] [2020-11-28 07:43:41,892 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-11-28 07:43:41,892 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-28 07:43:41,893 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-11-28 07:43:41,893 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-11-28 07:43:41,893 INFO L87 Difference]: Start difference. First operand 11 states and 12 transitions. Second operand 6 states. [2020-11-28 07:43:41,974 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 07:43:41,974 INFO L93 Difference]: Finished difference Result 19 states and 20 transitions. [2020-11-28 07:43:41,975 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-11-28 07:43:41,975 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 6 [2020-11-28 07:43:41,975 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-28 07:43:41,976 INFO L225 Difference]: With dead ends: 19 [2020-11-28 07:43:41,976 INFO L226 Difference]: Without dead ends: 19 [2020-11-28 07:43:41,976 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2020-11-28 07:43:41,977 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-11-28 07:43:41,978 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 15. [2020-11-28 07:43:41,978 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-11-28 07:43:41,978 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2020-11-28 07:43:41,979 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 6 [2020-11-28 07:43:41,979 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-28 07:43:41,979 INFO L481 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2020-11-28 07:43:41,979 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-11-28 07:43:41,979 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2020-11-28 07:43:41,979 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2020-11-28 07:43:41,979 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 07:43:41,979 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2020-11-28 07:43:41,980 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-11-28 07:43:41,980 INFO L429 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr6ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr5REQUIRES_VIOLATION, ULTIMATE.startErr4REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION]=== [2020-11-28 07:43:41,980 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 07:43:41,980 INFO L82 PathProgramCache]: Analyzing trace with hash 211727863, now seen corresponding path program 1 times [2020-11-28 07:43:41,980 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-28 07:43:41,981 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1618290088] [2020-11-28 07:43:41,981 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 07:43:42,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 07:43:42,055 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 07:43:42,055 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1618290088] [2020-11-28 07:43:42,055 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-28 07:43:42,055 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-11-28 07:43:42,056 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1982045109] [2020-11-28 07:43:42,056 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-11-28 07:43:42,056 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-28 07:43:42,057 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-11-28 07:43:42,057 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-11-28 07:43:42,057 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand 4 states. [2020-11-28 07:43:42,072 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 07:43:42,072 INFO L93 Difference]: Finished difference Result 14 states and 16 transitions. [2020-11-28 07:43:42,073 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-11-28 07:43:42,073 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 7 [2020-11-28 07:43:42,076 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-28 07:43:42,076 INFO L225 Difference]: With dead ends: 14 [2020-11-28 07:43:42,076 INFO L226 Difference]: Without dead ends: 9 [2020-11-28 07:43:42,077 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-11-28 07:43:42,077 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2020-11-28 07:43:42,078 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 9. [2020-11-28 07:43:42,078 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 9 states. [2020-11-28 07:43:42,078 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 10 transitions. [2020-11-28 07:43:42,078 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 10 transitions. Word has length 7 [2020-11-28 07:43:42,078 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-28 07:43:42,079 INFO L481 AbstractCegarLoop]: Abstraction has 9 states and 10 transitions. [2020-11-28 07:43:42,079 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-11-28 07:43:42,079 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 10 transitions. [2020-11-28 07:43:42,079 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2020-11-28 07:43:42,079 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 07:43:42,079 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2020-11-28 07:43:42,079 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-11-28 07:43:42,080 INFO L429 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr6ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr5REQUIRES_VIOLATION, ULTIMATE.startErr4REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION]=== [2020-11-28 07:43:42,080 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 07:43:42,080 INFO L82 PathProgramCache]: Analyzing trace with hash 2013045642, now seen corresponding path program 1 times [2020-11-28 07:43:42,080 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-28 07:43:42,080 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [217805907] [2020-11-28 07:43:42,080 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 07:43:42,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 07:43:42,193 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 07:43:42,193 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [217805907] [2020-11-28 07:43:42,193 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1534959653] [2020-11-28 07:43:42,193 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_81c6220f-3d32-4594-b91e-bad073ac52d8/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 [2020-11-28 07:43:42,248 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 07:43:42,249 INFO L263 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 22 conjunts are in the unsatisfiable core [2020-11-28 07:43:42,251 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 07:43:42,383 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 07:43:42,383 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-28 07:43:42,521 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 07:43:42,521 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1729388516] [2020-11-28 07:43:42,523 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2020-11-28 07:43:42,524 INFO L166 IcfgInterpreter]: Building call graph [2020-11-28 07:43:42,524 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-11-28 07:43:42,524 INFO L176 IcfgInterpreter]: Starting interpretation [2020-11-28 07:43:42,524 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-11-28 07:43:42,651 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-11-28 07:43:43,247 INFO L180 IcfgInterpreter]: Interpretation finished [2020-11-28 07:43:43,502 WARN L193 SmtUtils]: Spent 200.00 ms on a formula simplification. DAG size of input: 79 DAG size of output: 44 [2020-11-28 07:43:44,233 WARN L193 SmtUtils]: Spent 361.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 64 [2020-11-28 07:43:44,394 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 44 DAG size of output: 38 [2020-11-28 07:43:44,395 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-11-28 07:43:44,395 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-28 07:43:44,396 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 15 [2020-11-28 07:43:44,396 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1583570288] [2020-11-28 07:43:44,396 INFO L461 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-11-28 07:43:44,396 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-28 07:43:44,397 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-11-28 07:43:44,397 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=427, Unknown=0, NotChecked=0, Total=506 [2020-11-28 07:43:44,397 INFO L87 Difference]: Start difference. First operand 9 states and 10 transitions. Second operand 17 states. [2020-11-28 07:43:44,650 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 07:43:44,650 INFO L93 Difference]: Finished difference Result 13 states and 14 transitions. [2020-11-28 07:43:44,651 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-11-28 07:43:44,651 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 8 [2020-11-28 07:43:44,651 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-28 07:43:44,651 INFO L225 Difference]: With dead ends: 13 [2020-11-28 07:43:44,651 INFO L226 Difference]: Without dead ends: 13 [2020-11-28 07:43:44,652 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 179 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=132, Invalid=624, Unknown=0, NotChecked=0, Total=756 [2020-11-28 07:43:44,652 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2020-11-28 07:43:44,653 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 11. [2020-11-28 07:43:44,653 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2020-11-28 07:43:44,654 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 12 transitions. [2020-11-28 07:43:44,654 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 12 transitions. Word has length 8 [2020-11-28 07:43:44,654 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-28 07:43:44,654 INFO L481 AbstractCegarLoop]: Abstraction has 11 states and 12 transitions. [2020-11-28 07:43:44,654 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-11-28 07:43:44,654 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 12 transitions. [2020-11-28 07:43:44,655 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-11-28 07:43:44,655 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 07:43:44,655 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1] [2020-11-28 07:43:44,862 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2020-11-28 07:43:44,863 INFO L429 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr6ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr5REQUIRES_VIOLATION, ULTIMATE.startErr4REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION]=== [2020-11-28 07:43:44,863 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 07:43:44,863 INFO L82 PathProgramCache]: Analyzing trace with hash 1801578643, now seen corresponding path program 2 times [2020-11-28 07:43:44,863 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-28 07:43:44,864 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [629587552] [2020-11-28 07:43:44,864 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 07:43:44,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 07:43:45,118 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 07:43:45,118 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [629587552] [2020-11-28 07:43:45,118 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [986627145] [2020-11-28 07:43:45,118 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_81c6220f-3d32-4594-b91e-bad073ac52d8/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 [2020-11-28 07:43:45,186 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2020-11-28 07:43:45,186 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-28 07:43:45,187 INFO L263 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 27 conjunts are in the unsatisfiable core [2020-11-28 07:43:45,189 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 07:43:45,460 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 07:43:45,460 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-28 07:43:45,663 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 07:43:45,664 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1439658979] [2020-11-28 07:43:45,666 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2020-11-28 07:43:45,666 INFO L166 IcfgInterpreter]: Building call graph [2020-11-28 07:43:45,666 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-11-28 07:43:45,666 INFO L176 IcfgInterpreter]: Starting interpretation [2020-11-28 07:43:45,667 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-11-28 07:43:45,763 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-11-28 07:43:46,142 INFO L180 IcfgInterpreter]: Interpretation finished [2020-11-28 07:43:46,397 WARN L193 SmtUtils]: Spent 203.00 ms on a formula simplification. DAG size of input: 79 DAG size of output: 44 [2020-11-28 07:43:47,238 WARN L193 SmtUtils]: Spent 433.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 64 [2020-11-28 07:43:47,443 WARN L193 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 44 DAG size of output: 38 [2020-11-28 07:43:47,444 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-11-28 07:43:47,444 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-28 07:43:47,445 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 18 [2020-11-28 07:43:47,445 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1672626938] [2020-11-28 07:43:47,445 INFO L461 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-11-28 07:43:47,445 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-28 07:43:47,446 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-11-28 07:43:47,446 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=516, Unknown=0, NotChecked=0, Total=600 [2020-11-28 07:43:47,446 INFO L87 Difference]: Start difference. First operand 11 states and 12 transitions. Second operand 19 states. [2020-11-28 07:43:47,747 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 07:43:47,747 INFO L93 Difference]: Finished difference Result 19 states and 20 transitions. [2020-11-28 07:43:47,748 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-11-28 07:43:47,748 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 10 [2020-11-28 07:43:47,748 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-28 07:43:47,749 INFO L225 Difference]: With dead ends: 19 [2020-11-28 07:43:47,749 INFO L226 Difference]: Without dead ends: 14 [2020-11-28 07:43:47,750 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 11 SyntacticMatches, 3 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 2 DeprecatedPredicates, 256 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=140, Invalid=730, Unknown=0, NotChecked=0, Total=870 [2020-11-28 07:43:47,750 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-11-28 07:43:47,751 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 13. [2020-11-28 07:43:47,751 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2020-11-28 07:43:47,752 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2020-11-28 07:43:47,752 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 10 [2020-11-28 07:43:47,752 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-28 07:43:47,752 INFO L481 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2020-11-28 07:43:47,752 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-11-28 07:43:47,752 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2020-11-28 07:43:47,753 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-11-28 07:43:47,753 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 07:43:47,753 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1] [2020-11-28 07:43:47,960 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable71,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-28 07:43:47,960 INFO L429 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr6ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr5REQUIRES_VIOLATION, ULTIMATE.startErr4REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION]=== [2020-11-28 07:43:47,961 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 07:43:47,961 INFO L82 PathProgramCache]: Analyzing trace with hash -819315383, now seen corresponding path program 3 times [2020-11-28 07:43:47,961 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-28 07:43:47,961 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [145143405] [2020-11-28 07:43:47,961 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 07:43:47,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 07:43:48,127 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 07:43:48,127 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [145143405] [2020-11-28 07:43:48,127 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2105214326] [2020-11-28 07:43:48,127 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_81c6220f-3d32-4594-b91e-bad073ac52d8/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 [2020-11-28 07:43:48,192 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-11-28 07:43:48,192 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-28 07:43:48,197 INFO L263 TraceCheckSpWp]: Trace formula consists of 86 conjuncts, 23 conjunts are in the unsatisfiable core [2020-11-28 07:43:48,199 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 07:43:48,271 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 1 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 07:43:48,272 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-28 07:43:48,415 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 1 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 07:43:48,415 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [770291167] [2020-11-28 07:43:48,417 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2020-11-28 07:43:48,417 INFO L166 IcfgInterpreter]: Building call graph [2020-11-28 07:43:48,418 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-11-28 07:43:48,418 INFO L176 IcfgInterpreter]: Starting interpretation [2020-11-28 07:43:48,418 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-11-28 07:43:48,534 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-11-28 07:43:49,033 INFO L180 IcfgInterpreter]: Interpretation finished [2020-11-28 07:43:49,298 WARN L193 SmtUtils]: Spent 209.00 ms on a formula simplification. DAG size of input: 79 DAG size of output: 44 [2020-11-28 07:43:50,126 WARN L193 SmtUtils]: Spent 426.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 64 [2020-11-28 07:43:50,287 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 44 DAG size of output: 38 [2020-11-28 07:43:50,288 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-11-28 07:43:50,289 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-28 07:43:50,289 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 14 [2020-11-28 07:43:50,289 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [120703706] [2020-11-28 07:43:50,289 INFO L461 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-11-28 07:43:50,289 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-28 07:43:50,290 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-11-28 07:43:50,290 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=392, Unknown=0, NotChecked=0, Total=462 [2020-11-28 07:43:50,290 INFO L87 Difference]: Start difference. First operand 13 states and 14 transitions. Second operand 16 states. [2020-11-28 07:43:50,662 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 07:43:50,662 INFO L93 Difference]: Finished difference Result 16 states and 17 transitions. [2020-11-28 07:43:50,662 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-11-28 07:43:50,663 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 12 [2020-11-28 07:43:50,663 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-28 07:43:50,663 INFO L225 Difference]: With dead ends: 16 [2020-11-28 07:43:50,663 INFO L226 Difference]: Without dead ends: 16 [2020-11-28 07:43:50,664 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 19 SyntacticMatches, 2 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 128 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=124, Invalid=578, Unknown=0, NotChecked=0, Total=702 [2020-11-28 07:43:50,664 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-11-28 07:43:50,665 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 15. [2020-11-28 07:43:50,665 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-11-28 07:43:50,665 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2020-11-28 07:43:50,666 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 12 [2020-11-28 07:43:50,666 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-28 07:43:50,666 INFO L481 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2020-11-28 07:43:50,666 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-11-28 07:43:50,666 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2020-11-28 07:43:50,666 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-11-28 07:43:50,666 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 07:43:50,666 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1] [2020-11-28 07:43:50,867 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable115,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-28 07:43:50,867 INFO L429 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr6ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr5REQUIRES_VIOLATION, ULTIMATE.startErr4REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION]=== [2020-11-28 07:43:50,867 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 07:43:50,868 INFO L82 PathProgramCache]: Analyzing trace with hash -1383068014, now seen corresponding path program 4 times [2020-11-28 07:43:50,868 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-28 07:43:50,868 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [108169825] [2020-11-28 07:43:50,868 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 07:43:50,887 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 07:43:51,094 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 3 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 07:43:51,094 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [108169825] [2020-11-28 07:43:51,095 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1189652522] [2020-11-28 07:43:51,095 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_81c6220f-3d32-4594-b91e-bad073ac52d8/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 [2020-11-28 07:43:51,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 07:43:51,156 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 29 conjunts are in the unsatisfiable core [2020-11-28 07:43:51,157 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 07:43:51,513 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 07:43:51,513 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-28 07:43:51,983 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 4 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 07:43:51,983 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [724158208] [2020-11-28 07:43:51,985 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2020-11-28 07:43:51,986 INFO L166 IcfgInterpreter]: Building call graph [2020-11-28 07:43:51,986 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-11-28 07:43:51,986 INFO L176 IcfgInterpreter]: Starting interpretation [2020-11-28 07:43:51,986 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-11-28 07:43:52,302 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-11-28 07:43:52,380 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-11-28 07:43:52,546 INFO L180 IcfgInterpreter]: Interpretation finished [2020-11-28 07:43:52,716 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 42 [2020-11-28 07:43:52,953 WARN L193 SmtUtils]: Spent 170.00 ms on a formula simplification. DAG size of input: 77 DAG size of output: 60 [2020-11-28 07:43:53,286 WARN L193 SmtUtils]: Spent 170.00 ms on a formula simplification. DAG size of input: 79 DAG size of output: 62 [2020-11-28 07:43:53,423 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-11-28 07:43:53,423 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-28 07:43:53,423 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 26 [2020-11-28 07:43:53,423 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [223358926] [2020-11-28 07:43:53,424 INFO L461 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-11-28 07:43:53,424 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-28 07:43:53,424 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-11-28 07:43:53,425 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=887, Unknown=0, NotChecked=0, Total=992 [2020-11-28 07:43:53,425 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand 27 states. [2020-11-28 07:43:53,930 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 07:43:53,930 INFO L93 Difference]: Finished difference Result 25 states and 26 transitions. [2020-11-28 07:43:53,931 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-11-28 07:43:53,931 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 14 [2020-11-28 07:43:53,931 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-28 07:43:53,931 INFO L225 Difference]: With dead ends: 25 [2020-11-28 07:43:53,931 INFO L226 Difference]: Without dead ends: 18 [2020-11-28 07:43:53,932 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 20 SyntacticMatches, 1 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 239 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=228, Invalid=1412, Unknown=0, NotChecked=0, Total=1640 [2020-11-28 07:43:53,932 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-11-28 07:43:53,934 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 17. [2020-11-28 07:43:53,934 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-11-28 07:43:53,934 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2020-11-28 07:43:53,934 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 14 [2020-11-28 07:43:53,934 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-28 07:43:53,934 INFO L481 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2020-11-28 07:43:53,935 INFO L482 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-11-28 07:43:53,935 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2020-11-28 07:43:53,935 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-11-28 07:43:53,935 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 07:43:53,935 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1] [2020-11-28 07:43:54,136 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable160 [2020-11-28 07:43:54,136 INFO L429 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr6ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr5REQUIRES_VIOLATION, ULTIMATE.startErr4REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION]=== [2020-11-28 07:43:54,136 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 07:43:54,136 INFO L82 PathProgramCache]: Analyzing trace with hash -1760356280, now seen corresponding path program 5 times [2020-11-28 07:43:54,136 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-28 07:43:54,136 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1634164233] [2020-11-28 07:43:54,137 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 07:43:54,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 07:43:54,316 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 1 proven. 17 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 07:43:54,316 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1634164233] [2020-11-28 07:43:54,316 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [252054822] [2020-11-28 07:43:54,316 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_81c6220f-3d32-4594-b91e-bad073ac52d8/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 [2020-11-28 07:43:54,377 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2020-11-28 07:43:54,378 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-28 07:43:54,379 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 30 conjunts are in the unsatisfiable core [2020-11-28 07:43:54,382 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 07:43:54,614 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 4 proven. 14 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 07:43:54,614 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-28 07:43:54,867 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 9 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 07:43:54,867 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [194988685] [2020-11-28 07:43:54,869 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2020-11-28 07:43:54,869 INFO L166 IcfgInterpreter]: Building call graph [2020-11-28 07:43:54,869 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-11-28 07:43:54,870 INFO L176 IcfgInterpreter]: Starting interpretation [2020-11-28 07:43:54,870 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-11-28 07:43:55,247 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-11-28 07:43:55,258 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-11-28 07:43:55,454 INFO L180 IcfgInterpreter]: Interpretation finished [2020-11-28 07:43:55,619 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 42 [2020-11-28 07:43:55,840 WARN L193 SmtUtils]: Spent 163.00 ms on a formula simplification. DAG size of input: 77 DAG size of output: 60 [2020-11-28 07:43:56,160 WARN L193 SmtUtils]: Spent 169.00 ms on a formula simplification. DAG size of input: 79 DAG size of output: 62 [2020-11-28 07:43:56,293 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-11-28 07:43:56,293 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-28 07:43:56,293 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 27 [2020-11-28 07:43:56,293 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [252334181] [2020-11-28 07:43:56,294 INFO L461 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-11-28 07:43:56,294 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-28 07:43:56,295 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-11-28 07:43:56,295 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=143, Invalid=979, Unknown=0, NotChecked=0, Total=1122 [2020-11-28 07:43:56,295 INFO L87 Difference]: Start difference. First operand 17 states and 18 transitions. Second operand 29 states. [2020-11-28 07:43:56,700 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 07:43:56,700 INFO L93 Difference]: Finished difference Result 20 states and 21 transitions. [2020-11-28 07:43:56,700 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-11-28 07:43:56,700 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 16 [2020-11-28 07:43:56,700 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-28 07:43:56,701 INFO L225 Difference]: With dead ends: 20 [2020-11-28 07:43:56,701 INFO L226 Difference]: Without dead ends: 20 [2020-11-28 07:43:56,702 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 371 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=261, Invalid=1299, Unknown=0, NotChecked=0, Total=1560 [2020-11-28 07:43:56,702 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-11-28 07:43:56,703 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 19. [2020-11-28 07:43:56,704 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-11-28 07:43:56,704 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2020-11-28 07:43:56,704 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 16 [2020-11-28 07:43:56,705 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-28 07:43:56,705 INFO L481 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2020-11-28 07:43:56,705 INFO L482 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-11-28 07:43:56,705 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2020-11-28 07:43:56,705 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-11-28 07:43:56,706 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 07:43:56,706 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 1, 1, 1, 1] [2020-11-28 07:43:56,916 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable215,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-28 07:43:56,916 INFO L429 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr6ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr5REQUIRES_VIOLATION, ULTIMATE.startErr4REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION]=== [2020-11-28 07:43:56,916 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 07:43:56,917 INFO L82 PathProgramCache]: Analyzing trace with hash 514729425, now seen corresponding path program 6 times [2020-11-28 07:43:56,917 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-28 07:43:56,917 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1264287722] [2020-11-28 07:43:56,917 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 07:43:56,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 07:43:57,114 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 4 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 07:43:57,114 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1264287722] [2020-11-28 07:43:57,114 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [427253228] [2020-11-28 07:43:57,114 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_81c6220f-3d32-4594-b91e-bad073ac52d8/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 [2020-11-28 07:43:57,170 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-11-28 07:43:57,170 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-28 07:43:57,171 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 37 conjunts are in the unsatisfiable core [2020-11-28 07:43:57,172 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 07:43:57,378 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 4 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 07:43:57,378 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-28 07:43:57,559 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 4 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 07:43:57,559 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1173092962] [2020-11-28 07:43:57,561 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2020-11-28 07:43:57,561 INFO L166 IcfgInterpreter]: Building call graph [2020-11-28 07:43:57,561 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-11-28 07:43:57,561 INFO L176 IcfgInterpreter]: Starting interpretation [2020-11-28 07:43:57,561 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-11-28 07:43:57,927 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-11-28 07:43:57,948 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-11-28 07:43:58,076 INFO L180 IcfgInterpreter]: Interpretation finished [2020-11-28 07:43:58,498 WARN L193 SmtUtils]: Spent 160.00 ms on a formula simplification. DAG size of input: 77 DAG size of output: 60 [2020-11-28 07:43:58,828 WARN L193 SmtUtils]: Spent 187.00 ms on a formula simplification. DAG size of input: 79 DAG size of output: 62 [2020-11-28 07:43:58,961 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-11-28 07:43:58,961 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-28 07:43:58,961 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 22 [2020-11-28 07:43:58,961 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1905240682] [2020-11-28 07:43:58,962 INFO L461 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-11-28 07:43:58,962 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-28 07:43:58,962 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-11-28 07:43:58,962 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=677, Unknown=0, NotChecked=0, Total=756 [2020-11-28 07:43:58,963 INFO L87 Difference]: Start difference. First operand 19 states and 20 transitions. Second operand 23 states. [2020-11-28 07:43:59,425 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 07:43:59,425 INFO L93 Difference]: Finished difference Result 31 states and 32 transitions. [2020-11-28 07:43:59,426 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-11-28 07:43:59,426 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 18 [2020-11-28 07:43:59,426 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-28 07:43:59,426 INFO L225 Difference]: With dead ends: 31 [2020-11-28 07:43:59,426 INFO L226 Difference]: Without dead ends: 22 [2020-11-28 07:43:59,427 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 34 SyntacticMatches, 5 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 212 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=161, Invalid=1171, Unknown=0, NotChecked=0, Total=1332 [2020-11-28 07:43:59,427 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-11-28 07:43:59,429 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2020-11-28 07:43:59,429 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-11-28 07:43:59,429 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2020-11-28 07:43:59,430 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 18 [2020-11-28 07:43:59,430 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-28 07:43:59,430 INFO L481 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2020-11-28 07:43:59,430 INFO L482 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-11-28 07:43:59,430 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2020-11-28 07:43:59,430 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-11-28 07:43:59,431 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 07:43:59,431 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 1, 1, 1, 1] [2020-11-28 07:43:59,636 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable270,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-28 07:43:59,636 INFO L429 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr6ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr5REQUIRES_VIOLATION, ULTIMATE.startErr4REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION]=== [2020-11-28 07:43:59,637 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 07:43:59,637 INFO L82 PathProgramCache]: Analyzing trace with hash 394880135, now seen corresponding path program 7 times [2020-11-28 07:43:59,637 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-28 07:43:59,637 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1143917335] [2020-11-28 07:43:59,637 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 07:43:59,647 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 07:43:59,806 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 4 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 07:43:59,806 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1143917335] [2020-11-28 07:43:59,806 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1816966064] [2020-11-28 07:43:59,806 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_81c6220f-3d32-4594-b91e-bad073ac52d8/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 [2020-11-28 07:43:59,851 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 07:43:59,852 INFO L263 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 37 conjunts are in the unsatisfiable core [2020-11-28 07:43:59,854 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 07:44:00,158 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 9 proven. 23 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 07:44:00,158 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-28 07:44:00,546 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 16 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 07:44:00,546 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [796547329] [2020-11-28 07:44:00,548 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2020-11-28 07:44:00,548 INFO L166 IcfgInterpreter]: Building call graph [2020-11-28 07:44:00,548 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-11-28 07:44:00,549 INFO L176 IcfgInterpreter]: Starting interpretation [2020-11-28 07:44:00,549 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-11-28 07:44:00,635 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-11-28 07:44:00,863 INFO L180 IcfgInterpreter]: Interpretation finished [2020-11-28 07:44:01,110 WARN L193 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 79 DAG size of output: 44 [2020-11-28 07:44:01,766 WARN L193 SmtUtils]: Spent 306.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 64 [2020-11-28 07:44:01,930 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 44 DAG size of output: 38 [2020-11-28 07:44:01,932 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-11-28 07:44:01,933 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-28 07:44:01,933 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 33 [2020-11-28 07:44:01,933 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [255006095] [2020-11-28 07:44:01,933 INFO L461 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-11-28 07:44:01,933 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-28 07:44:01,934 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-11-28 07:44:01,935 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=196, Invalid=1444, Unknown=0, NotChecked=0, Total=1640 [2020-11-28 07:44:01,935 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 35 states. [2020-11-28 07:44:02,365 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 07:44:02,365 INFO L93 Difference]: Finished difference Result 24 states and 25 transitions. [2020-11-28 07:44:02,373 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-11-28 07:44:02,373 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 20 [2020-11-28 07:44:02,374 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-28 07:44:02,374 INFO L225 Difference]: With dead ends: 24 [2020-11-28 07:44:02,374 INFO L226 Difference]: Without dead ends: 24 [2020-11-28 07:44:02,375 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 651 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=348, Invalid=1908, Unknown=0, NotChecked=0, Total=2256 [2020-11-28 07:44:02,375 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-11-28 07:44:02,376 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 23. [2020-11-28 07:44:02,377 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-11-28 07:44:02,377 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2020-11-28 07:44:02,377 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 20 [2020-11-28 07:44:02,377 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-28 07:44:02,377 INFO L481 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2020-11-28 07:44:02,378 INFO L482 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-11-28 07:44:02,378 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2020-11-28 07:44:02,378 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-11-28 07:44:02,378 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 07:44:02,378 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 1, 1, 1, 1] [2020-11-28 07:44:02,584 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable325 [2020-11-28 07:44:02,584 INFO L429 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr6ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr5REQUIRES_VIOLATION, ULTIMATE.startErr4REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION]=== [2020-11-28 07:44:02,585 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 07:44:02,585 INFO L82 PathProgramCache]: Analyzing trace with hash 1522687568, now seen corresponding path program 8 times [2020-11-28 07:44:02,585 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-28 07:44:02,585 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [957008282] [2020-11-28 07:44:02,585 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 07:44:02,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 07:44:02,871 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 5 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 07:44:02,872 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [957008282] [2020-11-28 07:44:02,872 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2090840708] [2020-11-28 07:44:02,872 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_81c6220f-3d32-4594-b91e-bad073ac52d8/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 [2020-11-28 07:44:02,956 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2020-11-28 07:44:02,956 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-28 07:44:02,958 INFO L263 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 32 conjunts are in the unsatisfiable core [2020-11-28 07:44:02,960 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 07:44:03,181 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2020-11-28 07:44:03,181 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-28 07:44:03,519 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2020-11-28 07:44:03,520 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1666923291] [2020-11-28 07:44:03,526 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2020-11-28 07:44:03,527 INFO L166 IcfgInterpreter]: Building call graph [2020-11-28 07:44:03,527 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-11-28 07:44:03,527 INFO L176 IcfgInterpreter]: Starting interpretation [2020-11-28 07:44:03,528 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-11-28 07:44:03,884 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-11-28 07:44:03,909 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-11-28 07:44:04,075 INFO L180 IcfgInterpreter]: Interpretation finished [2020-11-28 07:44:04,359 WARN L193 SmtUtils]: Spent 240.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 42 [2020-11-28 07:44:04,624 WARN L193 SmtUtils]: Spent 178.00 ms on a formula simplification. DAG size of input: 77 DAG size of output: 60 [2020-11-28 07:44:05,037 WARN L193 SmtUtils]: Spent 207.00 ms on a formula simplification. DAG size of input: 79 DAG size of output: 62 [2020-11-28 07:44:05,272 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 44 DAG size of output: 38 [2020-11-28 07:44:05,273 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-11-28 07:44:05,273 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-28 07:44:05,273 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 4, 4] total 22 [2020-11-28 07:44:05,273 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [153784980] [2020-11-28 07:44:05,273 INFO L461 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-11-28 07:44:05,274 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-28 07:44:05,274 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-11-28 07:44:05,274 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=694, Unknown=0, NotChecked=0, Total=756 [2020-11-28 07:44:05,275 INFO L87 Difference]: Start difference. First operand 23 states and 24 transitions. Second operand 23 states. [2020-11-28 07:44:06,389 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 07:44:06,389 INFO L93 Difference]: Finished difference Result 36 states and 37 transitions. [2020-11-28 07:44:06,389 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-11-28 07:44:06,390 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 22 [2020-11-28 07:44:06,390 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-28 07:44:06,390 INFO L225 Difference]: With dead ends: 36 [2020-11-28 07:44:06,390 INFO L226 Difference]: Without dead ends: 0 [2020-11-28 07:44:06,391 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 52 SyntacticMatches, 1 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 209 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=299, Invalid=1957, Unknown=0, NotChecked=0, Total=2256 [2020-11-28 07:44:06,391 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-11-28 07:44:06,391 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-11-28 07:44:06,391 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-11-28 07:44:06,391 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-11-28 07:44:06,391 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 22 [2020-11-28 07:44:06,392 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-28 07:44:06,392 INFO L481 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-11-28 07:44:06,392 INFO L482 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-11-28 07:44:06,392 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-11-28 07:44:06,392 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-11-28 07:44:06,592 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable369,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-28 07:44:06,597 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 28.11 07:44:06 BoogieIcfgContainer [2020-11-28 07:44:06,597 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-11-28 07:44:06,597 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-11-28 07:44:06,597 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-11-28 07:44:06,598 INFO L275 PluginConnector]: Witness Printer initialized [2020-11-28 07:44:06,598 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.11 07:43:39" (3/4) ... [2020-11-28 07:44:06,601 INFO L137 WitnessPrinter]: Generating witness for correct program [2020-11-28 07:44:06,609 INFO L902 BoogieBacktranslator]: Reduced CFG by removing 13 nodes and edges [2020-11-28 07:44:06,609 INFO L902 BoogieBacktranslator]: Reduced CFG by removing 6 nodes and edges [2020-11-28 07:44:06,610 INFO L902 BoogieBacktranslator]: Reduced CFG by removing 2 nodes and edges [2020-11-28 07:44:06,647 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/run_dir_81c6220f-3d32-4594-b91e-bad073ac52d8/bin/utaipan/witness.graphml [2020-11-28 07:44:06,647 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-11-28 07:44:06,648 INFO L168 Benchmark]: Toolchain (without parser) took 28600.18 ms. Allocated memory was 86.0 MB in the beginning and 243.3 MB in the end (delta: 157.3 MB). Free memory was 53.4 MB in the beginning and 162.1 MB in the end (delta: -108.7 MB). Peak memory consumption was 48.1 MB. Max. memory is 16.1 GB. [2020-11-28 07:44:06,649 INFO L168 Benchmark]: CDTParser took 0.32 ms. Allocated memory is still 86.0 MB. Free memory is still 43.6 MB. There was no memory consumed. Max. memory is 16.1 GB. [2020-11-28 07:44:06,649 INFO L168 Benchmark]: CACSL2BoogieTranslator took 501.35 ms. Allocated memory was 86.0 MB in the beginning and 115.3 MB in the end (delta: 29.4 MB). Free memory was 53.1 MB in the beginning and 82.5 MB in the end (delta: -29.4 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. [2020-11-28 07:44:06,649 INFO L168 Benchmark]: Boogie Procedure Inliner took 44.64 ms. Allocated memory is still 115.3 MB. Free memory was 82.5 MB in the beginning and 80.4 MB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-11-28 07:44:06,650 INFO L168 Benchmark]: Boogie Preprocessor took 27.33 ms. Allocated memory is still 115.3 MB. Free memory was 80.4 MB in the beginning and 79.6 MB in the end (delta: 772.0 kB). There was no memory consumed. Max. memory is 16.1 GB. [2020-11-28 07:44:06,650 INFO L168 Benchmark]: RCFGBuilder took 687.73 ms. Allocated memory is still 115.3 MB. Free memory was 78.9 MB in the beginning and 57.1 MB in the end (delta: 21.8 MB). Peak memory consumption was 21.0 MB. Max. memory is 16.1 GB. [2020-11-28 07:44:06,651 INFO L168 Benchmark]: TraceAbstraction took 27282.14 ms. Allocated memory was 115.3 MB in the beginning and 243.3 MB in the end (delta: 127.9 MB). Free memory was 57.1 MB in the beginning and 165.2 MB in the end (delta: -108.1 MB). Peak memory consumption was 23.4 MB. Max. memory is 16.1 GB. [2020-11-28 07:44:06,651 INFO L168 Benchmark]: Witness Printer took 50.33 ms. Allocated memory is still 243.3 MB. Free memory was 165.2 MB in the beginning and 162.1 MB in the end (delta: 3.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-11-28 07:44:06,653 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.32 ms. Allocated memory is still 86.0 MB. Free memory is still 43.6 MB. There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 501.35 ms. Allocated memory was 86.0 MB in the beginning and 115.3 MB in the end (delta: 29.4 MB). Free memory was 53.1 MB in the beginning and 82.5 MB in the end (delta: -29.4 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 44.64 ms. Allocated memory is still 115.3 MB. Free memory was 82.5 MB in the beginning and 80.4 MB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Boogie Preprocessor took 27.33 ms. Allocated memory is still 115.3 MB. Free memory was 80.4 MB in the beginning and 79.6 MB in the end (delta: 772.0 kB). There was no memory consumed. Max. memory is 16.1 GB. * RCFGBuilder took 687.73 ms. Allocated memory is still 115.3 MB. Free memory was 78.9 MB in the beginning and 57.1 MB in the end (delta: 21.8 MB). Peak memory consumption was 21.0 MB. Max. memory is 16.1 GB. * TraceAbstraction took 27282.14 ms. Allocated memory was 115.3 MB in the beginning and 243.3 MB in the end (delta: 127.9 MB). Free memory was 57.1 MB in the beginning and 165.2 MB in the end (delta: -108.1 MB). Peak memory consumption was 23.4 MB. Max. memory is 16.1 GB. * Witness Printer took 50.33 ms. Allocated memory is still 243.3 MB. Free memory was 165.2 MB in the beginning and 162.1 MB in the end (delta: 3.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 530]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 530]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 522]: all allocated memory was freed For all program executions holds that all allocated memory was freed at this location - PositiveResult [Line: 518]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 518]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 532]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 532]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - AllSpecificationsHoldResult: All specifications hold 7 specifications checked. All of them hold - StatisticsResult: Ultimate Automizer benchmark data CFG has 1 procedures, 16 locations, 7 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 27.2s, OverallIterations: 16, TraceHistogramMax: 5, AutomataDifference: 4.4s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 69 SDtfs, 365 SDslu, 127 SDs, 0 SdLazy, 1547 SolverSat, 179 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 1.3s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 529 GetRequests, 202 SyntacticMatches, 13 SemanticMatches, 314 ConstructedPredicates, 0 IntricatePredicates, 3 DeprecatedPredicates, 2267 ImplicationChecksByTransitivity, 16.1s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=23occurred in iteration=15, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 16 MinimizatonAttempts, 40 StatesRemovedByMinimization, 10 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.1s SsaConstructionTime, 0.4s SatisfiabilityAnalysisTime, 6.0s InterpolantComputationTime, 280 NumberOfCodeBlocks, 280 NumberOfCodeBlocksAsserted, 37 NumberOfCheckSat, 371 ConstructedInterpolants, 18 QuantifiedInterpolants, 62129 SizeOfPredicates, 99 NumberOfNonLiveVariables, 855 ConjunctsInSsa, 248 ConjunctsInUnsatCore, 34 InterpolantComputations, 7 PerfectInterpolantSequences, 149/439 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...