./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_7f19bb21-c54c-4ae5-85f8-961a059818cd/bin/utaipan/data/config -Xmx15G -Xms4m -jar /tmp/vcloud-vcloud-master/worker/run_dir_7f19bb21-c54c-4ae5-85f8-961a059818cd/bin/utaipan/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_7f19bb21-c54c-4ae5-85f8-961a059818cd/bin/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_7f19bb21-c54c-4ae5-85f8-961a059818cd/bin/utaipan/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/array-memsafety/openbsd_cstrlen-alloca-1.i -s /tmp/vcloud-vcloud-master/worker/run_dir_7f19bb21-c54c-4ae5-85f8-961a059818cd/bin/utaipan/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_7f19bb21-c54c-4ae5-85f8-961a059818cd/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 [2020-11-22 13:02:18,916 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-11-22 13:02:18,919 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-11-22 13:02:18,976 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-11-22 13:02:18,987 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-11-22 13:02:18,988 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-11-22 13:02:18,990 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-11-22 13:02:18,993 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-11-22 13:02:19,005 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-11-22 13:02:19,006 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-11-22 13:02:19,008 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-11-22 13:02:19,009 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-11-22 13:02:19,011 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-11-22 13:02:19,014 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-11-22 13:02:19,016 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-11-22 13:02:19,018 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-11-22 13:02:19,020 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-11-22 13:02:19,027 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-11-22 13:02:19,029 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-11-22 13:02:19,031 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-11-22 13:02:19,033 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-11-22 13:02:19,034 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-11-22 13:02:19,035 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-11-22 13:02:19,036 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-11-22 13:02:19,040 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-11-22 13:02:19,040 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-11-22 13:02:19,040 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-11-22 13:02:19,041 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-11-22 13:02:19,042 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-11-22 13:02:19,043 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-11-22 13:02:19,043 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-11-22 13:02:19,044 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-11-22 13:02:19,045 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-11-22 13:02:19,046 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-11-22 13:02:19,047 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-11-22 13:02:19,047 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-11-22 13:02:19,048 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-11-22 13:02:19,048 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-11-22 13:02:19,048 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-11-22 13:02:19,049 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-11-22 13:02:19,050 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-11-22 13:02:19,051 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/run_dir_7f19bb21-c54c-4ae5-85f8-961a059818cd/bin/utaipan/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2020-11-22 13:02:19,079 INFO L113 SettingsManager]: Loading preferences was successful [2020-11-22 13:02:19,080 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-11-22 13:02:19,080 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2020-11-22 13:02:19,081 INFO L138 SettingsManager]: * User list type=DISABLED [2020-11-22 13:02:19,081 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2020-11-22 13:02:19,081 INFO L138 SettingsManager]: * Explicit value domain=true [2020-11-22 13:02:19,081 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2020-11-22 13:02:19,082 INFO L138 SettingsManager]: * Octagon Domain=false [2020-11-22 13:02:19,082 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2020-11-22 13:02:19,082 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2020-11-22 13:02:19,082 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2020-11-22 13:02:19,082 INFO L138 SettingsManager]: * Interval Domain=false [2020-11-22 13:02:19,083 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2020-11-22 13:02:19,083 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2020-11-22 13:02:19,083 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2020-11-22 13:02:19,084 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-11-22 13:02:19,086 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-11-22 13:02:19,086 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-11-22 13:02:19,086 INFO L138 SettingsManager]: * sizeof long=4 [2020-11-22 13:02:19,086 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2020-11-22 13:02:19,086 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-11-22 13:02:19,087 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-11-22 13:02:19,087 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-11-22 13:02:19,087 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2020-11-22 13:02:19,088 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2020-11-22 13:02:19,088 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2020-11-22 13:02:19,090 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-11-22 13:02:19,090 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2020-11-22 13:02:19,091 INFO L138 SettingsManager]: * sizeof long double=12 [2020-11-22 13:02:19,091 INFO L138 SettingsManager]: * Use constant arrays=true [2020-11-22 13:02:19,091 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-11-22 13:02:19,091 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-11-22 13:02:19,091 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-11-22 13:02:19,092 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-11-22 13:02:19,092 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-11-22 13:02:19,092 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-11-22 13:02:19,093 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2020-11-22 13:02:19,093 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-11-22 13:02:19,094 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-11-22 13:02:19,094 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2020-11-22 13:02:19,094 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_7f19bb21-c54c-4ae5-85f8-961a059818cd/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud-vcloud-master/worker/run_dir_7f19bb21-c54c-4ae5-85f8-961a059818cd/bin/utaipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> b812e7d14425eea3a24125f5e2db40eadfc6c14c [2020-11-22 13:02:19,331 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-11-22 13:02:19,367 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-11-22 13:02:19,369 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-11-22 13:02:19,370 INFO L271 PluginConnector]: Initializing CDTParser... [2020-11-22 13:02:19,372 INFO L275 PluginConnector]: CDTParser initialized [2020-11-22 13:02:19,373 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_7f19bb21-c54c-4ae5-85f8-961a059818cd/bin/utaipan/../../sv-benchmarks/c/array-memsafety/openbsd_cstrlen-alloca-1.i [2020-11-22 13:02:19,474 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_7f19bb21-c54c-4ae5-85f8-961a059818cd/bin/utaipan/data/a2a52397f/7435099ad8de4865a36ef95386f4071f/FLAGd5e3ed790 [2020-11-22 13:02:19,992 INFO L306 CDTParser]: Found 1 translation units. [2020-11-22 13:02:19,993 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_7f19bb21-c54c-4ae5-85f8-961a059818cd/sv-benchmarks/c/array-memsafety/openbsd_cstrlen-alloca-1.i [2020-11-22 13:02:20,020 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_7f19bb21-c54c-4ae5-85f8-961a059818cd/bin/utaipan/data/a2a52397f/7435099ad8de4865a36ef95386f4071f/FLAGd5e3ed790 [2020-11-22 13:02:20,340 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_7f19bb21-c54c-4ae5-85f8-961a059818cd/bin/utaipan/data/a2a52397f/7435099ad8de4865a36ef95386f4071f [2020-11-22 13:02:20,344 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-11-22 13:02:20,345 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-11-22 13:02:20,351 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-11-22 13:02:20,351 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-11-22 13:02:20,354 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-11-22 13:02:20,355 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.11 01:02:20" (1/1) ... [2020-11-22 13:02:20,358 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@735947b8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:02:20, skipping insertion in model container [2020-11-22 13:02:20,359 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.11 01:02:20" (1/1) ... [2020-11-22 13:02:20,366 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-11-22 13:02:20,399 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-11-22 13:02:20,665 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-22 13:02:20,673 INFO L203 MainTranslator]: Completed pre-run [2020-11-22 13:02:20,708 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-22 13:02:20,757 INFO L208 MainTranslator]: Completed translation [2020-11-22 13:02:20,758 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:02:20 WrapperNode [2020-11-22 13:02:20,758 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-11-22 13:02:20,759 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-11-22 13:02:20,759 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-11-22 13:02:20,759 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-11-22 13:02:20,766 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:02:20" (1/1) ... [2020-11-22 13:02:20,778 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:02:20" (1/1) ... [2020-11-22 13:02:20,795 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-11-22 13:02:20,796 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-11-22 13:02:20,796 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-11-22 13:02:20,797 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-11-22 13:02:20,804 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:02:20" (1/1) ... [2020-11-22 13:02:20,804 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:02:20" (1/1) ... [2020-11-22 13:02:20,807 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:02:20" (1/1) ... [2020-11-22 13:02:20,807 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:02:20" (1/1) ... [2020-11-22 13:02:20,812 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:02:20" (1/1) ... [2020-11-22 13:02:20,816 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:02:20" (1/1) ... [2020-11-22 13:02:20,817 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:02:20" (1/1) ... [2020-11-22 13:02:20,819 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-11-22 13:02:20,820 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-11-22 13:02:20,820 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-11-22 13:02:20,820 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-11-22 13:02:20,821 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:02:20" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_7f19bb21-c54c-4ae5-85f8-961a059818cd/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 [2020-11-22 13:02:20,886 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-11-22 13:02:20,887 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-11-22 13:02:20,887 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-11-22 13:02:20,887 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-11-22 13:02:20,887 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-11-22 13:02:20,888 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-11-22 13:02:21,392 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-11-22 13:02:21,392 INFO L298 CfgBuilder]: Removed 8 assume(true) statements. [2020-11-22 13:02:21,394 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.11 01:02:21 BoogieIcfgContainer [2020-11-22 13:02:21,394 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-11-22 13:02:21,396 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-11-22 13:02:21,396 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-11-22 13:02:21,399 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-11-22 13:02:21,400 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.11 01:02:20" (1/3) ... [2020-11-22 13:02:21,400 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@71172c0b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.11 01:02:21, skipping insertion in model container [2020-11-22 13:02:21,401 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:02:20" (2/3) ... [2020-11-22 13:02:21,401 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@71172c0b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.11 01:02:21, skipping insertion in model container [2020-11-22 13:02:21,401 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.11 01:02:21" (3/3) ... [2020-11-22 13:02:21,403 INFO L111 eAbstractionObserver]: Analyzing ICFG openbsd_cstrlen-alloca-1.i [2020-11-22 13:02:21,413 INFO L164 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-11-22 13:02:21,417 INFO L176 ceAbstractionStarter]: Appying trace abstraction to program that has 7 error locations. [2020-11-22 13:02:21,427 INFO L253 AbstractCegarLoop]: Starting to check reachability of 7 error locations. [2020-11-22 13:02:21,446 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-11-22 13:02:21,446 INFO L378 AbstractCegarLoop]: Hoare is false [2020-11-22 13:02:21,446 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-11-22 13:02:21,447 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-11-22 13:02:21,447 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-11-22 13:02:21,447 INFO L382 AbstractCegarLoop]: Difference is false [2020-11-22 13:02:21,447 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-11-22 13:02:21,447 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-11-22 13:02:21,458 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states. [2020-11-22 13:02:21,463 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2020-11-22 13:02:21,463 INFO L414 BasicCegarLoop]: Found error trace [2020-11-22 13:02:21,464 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1] [2020-11-22 13:02:21,465 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]=== [2020-11-22 13:02:21,470 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-22 13:02:21,470 INFO L82 PathProgramCache]: Analyzing trace with hash 91841, now seen corresponding path program 1 times [2020-11-22 13:02:21,479 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-22 13:02:21,479 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1048662169] [2020-11-22 13:02:21,479 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-22 13:02:21,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 13:02:21,621 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-22 13:02:21,624 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1048662169] [2020-11-22 13:02:21,624 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-22 13:02:21,625 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2020-11-22 13:02:21,625 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [217182608] [2020-11-22 13:02:21,629 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-11-22 13:02:21,629 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-22 13:02:21,645 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-11-22 13:02:21,646 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-11-22 13:02:21,648 INFO L87 Difference]: Start difference. First operand 16 states. Second operand 3 states. [2020-11-22 13:02:21,707 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-22 13:02:21,707 INFO L93 Difference]: Finished difference Result 14 states and 15 transitions. [2020-11-22 13:02:21,708 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-11-22 13:02:21,709 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 3 [2020-11-22 13:02:21,709 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-22 13:02:21,717 INFO L225 Difference]: With dead ends: 14 [2020-11-22 13:02:21,718 INFO L226 Difference]: Without dead ends: 13 [2020-11-22 13:02:21,720 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 [2020-11-22 13:02:21,736 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2020-11-22 13:02:21,745 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2020-11-22 13:02:21,746 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2020-11-22 13:02:21,747 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2020-11-22 13:02:21,748 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 3 [2020-11-22 13:02:21,748 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-22 13:02:21,748 INFO L481 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2020-11-22 13:02:21,748 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-11-22 13:02:21,748 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2020-11-22 13:02:21,754 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2020-11-22 13:02:21,755 INFO L414 BasicCegarLoop]: Found error trace [2020-11-22 13:02:21,755 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1] [2020-11-22 13:02:21,755 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-11-22 13:02:21,755 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]=== [2020-11-22 13:02:21,756 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-22 13:02:21,756 INFO L82 PathProgramCache]: Analyzing trace with hash 91842, now seen corresponding path program 1 times [2020-11-22 13:02:21,756 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-22 13:02:21,756 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [349855091] [2020-11-22 13:02:21,756 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-22 13:02:21,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 13:02:21,840 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-22 13:02:21,841 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [349855091] [2020-11-22 13:02:21,841 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-22 13:02:21,841 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-11-22 13:02:21,841 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [137314178] [2020-11-22 13:02:21,842 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-11-22 13:02:21,842 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-22 13:02:21,843 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-11-22 13:02:21,843 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-11-22 13:02:21,843 INFO L87 Difference]: Start difference. First operand 13 states and 14 transitions. Second operand 4 states. [2020-11-22 13:02:21,941 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-22 13:02:21,941 INFO L93 Difference]: Finished difference Result 24 states and 26 transitions. [2020-11-22 13:02:21,941 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-11-22 13:02:21,942 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 3 [2020-11-22 13:02:21,942 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-22 13:02:21,942 INFO L225 Difference]: With dead ends: 24 [2020-11-22 13:02:21,942 INFO L226 Difference]: Without dead ends: 24 [2020-11-22 13:02:21,943 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 [2020-11-22 13:02:21,944 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-11-22 13:02:21,946 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 15. [2020-11-22 13:02:21,946 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-11-22 13:02:21,946 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2020-11-22 13:02:21,947 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 3 [2020-11-22 13:02:21,947 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-22 13:02:21,947 INFO L481 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2020-11-22 13:02:21,947 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-11-22 13:02:21,947 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2020-11-22 13:02:21,947 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2020-11-22 13:02:21,947 INFO L414 BasicCegarLoop]: Found error trace [2020-11-22 13:02:21,948 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1] [2020-11-22 13:02:21,948 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-11-22 13:02:21,948 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]=== [2020-11-22 13:02:21,949 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-22 13:02:21,949 INFO L82 PathProgramCache]: Analyzing trace with hash 93215, now seen corresponding path program 1 times [2020-11-22 13:02:21,949 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-22 13:02:21,949 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1579231366] [2020-11-22 13:02:21,949 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-22 13:02:21,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 13:02:22,014 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-22 13:02:22,014 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1579231366] [2020-11-22 13:02:22,014 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-22 13:02:22,014 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2020-11-22 13:02:22,014 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2100316278] [2020-11-22 13:02:22,015 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-11-22 13:02:22,015 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-22 13:02:22,016 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-11-22 13:02:22,016 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-11-22 13:02:22,016 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand 3 states. [2020-11-22 13:02:22,065 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-22 13:02:22,066 INFO L93 Difference]: Finished difference Result 14 states and 16 transitions. [2020-11-22 13:02:22,066 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-11-22 13:02:22,067 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 3 [2020-11-22 13:02:22,067 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-22 13:02:22,067 INFO L225 Difference]: With dead ends: 14 [2020-11-22 13:02:22,067 INFO L226 Difference]: Without dead ends: 14 [2020-11-22 13:02:22,068 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 [2020-11-22 13:02:22,068 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-11-22 13:02:22,069 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-11-22 13:02:22,069 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-11-22 13:02:22,070 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 16 transitions. [2020-11-22 13:02:22,070 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 16 transitions. Word has length 3 [2020-11-22 13:02:22,070 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-22 13:02:22,070 INFO L481 AbstractCegarLoop]: Abstraction has 14 states and 16 transitions. [2020-11-22 13:02:22,070 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-11-22 13:02:22,070 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 16 transitions. [2020-11-22 13:02:22,071 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2020-11-22 13:02:22,071 INFO L414 BasicCegarLoop]: Found error trace [2020-11-22 13:02:22,071 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2020-11-22 13:02:22,071 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-11-22 13:02:22,071 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]=== [2020-11-22 13:02:22,072 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-22 13:02:22,072 INFO L82 PathProgramCache]: Analyzing trace with hash 2890506, now seen corresponding path program 1 times [2020-11-22 13:02:22,073 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-22 13:02:22,073 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [138267129] [2020-11-22 13:02:22,073 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-22 13:02:22,084 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 13:02:22,100 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-22 13:02:22,100 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [138267129] [2020-11-22 13:02:22,101 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-22 13:02:22,101 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-11-22 13:02:22,101 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1906325437] [2020-11-22 13:02:22,101 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-11-22 13:02:22,101 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-22 13:02:22,102 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-11-22 13:02:22,102 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-11-22 13:02:22,102 INFO L87 Difference]: Start difference. First operand 14 states and 16 transitions. Second operand 3 states. [2020-11-22 13:02:22,123 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-22 13:02:22,123 INFO L93 Difference]: Finished difference Result 13 states and 15 transitions. [2020-11-22 13:02:22,123 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-11-22 13:02:22,124 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 4 [2020-11-22 13:02:22,124 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-22 13:02:22,124 INFO L225 Difference]: With dead ends: 13 [2020-11-22 13:02:22,124 INFO L226 Difference]: Without dead ends: 13 [2020-11-22 13:02:22,125 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 [2020-11-22 13:02:22,125 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2020-11-22 13:02:22,126 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2020-11-22 13:02:22,126 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2020-11-22 13:02:22,127 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 15 transitions. [2020-11-22 13:02:22,127 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 15 transitions. Word has length 4 [2020-11-22 13:02:22,127 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-22 13:02:22,127 INFO L481 AbstractCegarLoop]: Abstraction has 13 states and 15 transitions. [2020-11-22 13:02:22,127 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-11-22 13:02:22,127 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 15 transitions. [2020-11-22 13:02:22,128 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2020-11-22 13:02:22,128 INFO L414 BasicCegarLoop]: Found error trace [2020-11-22 13:02:22,128 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2020-11-22 13:02:22,128 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-11-22 13:02:22,128 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]=== [2020-11-22 13:02:22,129 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-22 13:02:22,129 INFO L82 PathProgramCache]: Analyzing trace with hash 2890507, now seen corresponding path program 1 times [2020-11-22 13:02:22,129 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-22 13:02:22,129 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1246944350] [2020-11-22 13:02:22,129 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-22 13:02:22,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 13:02:22,196 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-22 13:02:22,196 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1246944350] [2020-11-22 13:02:22,197 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-22 13:02:22,197 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-11-22 13:02:22,197 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [711377972] [2020-11-22 13:02:22,197 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-11-22 13:02:22,197 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-22 13:02:22,198 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-11-22 13:02:22,198 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-11-22 13:02:22,198 INFO L87 Difference]: Start difference. First operand 13 states and 15 transitions. Second operand 4 states. [2020-11-22 13:02:22,247 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-22 13:02:22,247 INFO L93 Difference]: Finished difference Result 14 states and 16 transitions. [2020-11-22 13:02:22,248 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-11-22 13:02:22,248 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 4 [2020-11-22 13:02:22,248 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-22 13:02:22,248 INFO L225 Difference]: With dead ends: 14 [2020-11-22 13:02:22,248 INFO L226 Difference]: Without dead ends: 14 [2020-11-22 13:02:22,249 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 [2020-11-22 13:02:22,249 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-11-22 13:02:22,250 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-11-22 13:02:22,250 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-11-22 13:02:22,251 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 16 transitions. [2020-11-22 13:02:22,251 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 16 transitions. Word has length 4 [2020-11-22 13:02:22,251 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-22 13:02:22,251 INFO L481 AbstractCegarLoop]: Abstraction has 14 states and 16 transitions. [2020-11-22 13:02:22,251 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-11-22 13:02:22,252 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 16 transitions. [2020-11-22 13:02:22,252 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2020-11-22 13:02:22,252 INFO L414 BasicCegarLoop]: Found error trace [2020-11-22 13:02:22,252 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1] [2020-11-22 13:02:22,252 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-11-22 13:02:22,252 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]=== [2020-11-22 13:02:22,253 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-22 13:02:22,253 INFO L82 PathProgramCache]: Analyzing trace with hash 88298188, now seen corresponding path program 1 times [2020-11-22 13:02:22,253 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-22 13:02:22,253 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [84925319] [2020-11-22 13:02:22,253 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-22 13:02:22,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 13:02:22,336 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-22 13:02:22,337 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [84925319] [2020-11-22 13:02:22,337 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [143383388] [2020-11-22 13:02:22,337 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_7f19bb21-c54c-4ae5-85f8-961a059818cd/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 [2020-11-22 13:02:22,428 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 13:02:22,431 INFO L263 TraceCheckSpWp]: Trace formula consists of 39 conjuncts, 11 conjunts are in the unsatisfiable core [2020-11-22 13:02:22,435 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-22 13:02:22,489 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 [2020-11-22 13:02:22,489 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-11-22 13:02:22,504 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-11-22 13:02:22,505 INFO L545 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2020-11-22 13:02:22,505 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:13, output treesize:12 [2020-11-22 13:02:22,549 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-22 13:02:22,549 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-22 13:02:22,627 INFO L603 QuantifierPusher]: Distributing 2 disjuncts over 3 conjuncts [2020-11-22 13:02:22,668 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-22 13:02:22,668 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [206696819] [2020-11-22 13:02:22,688 INFO L159 IcfgInterpreter]: Started Sifa with 4 locations of interest [2020-11-22 13:02:22,688 INFO L166 IcfgInterpreter]: Building call graph [2020-11-22 13:02:22,692 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-11-22 13:02:22,697 INFO L176 IcfgInterpreter]: Starting interpretation [2020-11-22 13:02:22,698 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-11-22 13:02:22,933 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-11-22 13:02:23,146 INFO L180 IcfgInterpreter]: Interpretation finished [2020-11-22 13:02:23,273 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 43 DAG size of output: 34 [2020-11-22 13:02:23,453 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-11-22 13:02:23,454 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-22 13:02:23,454 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 7 [2020-11-22 13:02:23,454 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1354814340] [2020-11-22 13:02:23,454 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-11-22 13:02:23,454 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-22 13:02:23,455 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-11-22 13:02:23,455 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=97, Unknown=0, NotChecked=0, Total=132 [2020-11-22 13:02:23,455 INFO L87 Difference]: Start difference. First operand 14 states and 16 transitions. Second operand 9 states. [2020-11-22 13:02:23,616 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-22 13:02:23,617 INFO L93 Difference]: Finished difference Result 30 states and 33 transitions. [2020-11-22 13:02:23,617 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-11-22 13:02:23,617 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 5 [2020-11-22 13:02:23,617 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-22 13:02:23,618 INFO L225 Difference]: With dead ends: 30 [2020-11-22 13:02:23,618 INFO L226 Difference]: Without dead ends: 30 [2020-11-22 13:02:23,619 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 [2020-11-22 13:02:23,619 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-11-22 13:02:23,620 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 11. [2020-11-22 13:02:23,620 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2020-11-22 13:02:23,621 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 12 transitions. [2020-11-22 13:02:23,621 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 12 transitions. Word has length 5 [2020-11-22 13:02:23,621 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-22 13:02:23,621 INFO L481 AbstractCegarLoop]: Abstraction has 11 states and 12 transitions. [2020-11-22 13:02:23,621 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-11-22 13:02:23,621 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 12 transitions. [2020-11-22 13:02:23,621 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2020-11-22 13:02:23,622 INFO L414 BasicCegarLoop]: Found error trace [2020-11-22 13:02:23,622 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2020-11-22 13:02:23,822 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2020-11-22 13:02:23,823 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]=== [2020-11-22 13:02:23,823 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-22 13:02:23,823 INFO L82 PathProgramCache]: Analyzing trace with hash -1517190188, now seen corresponding path program 1 times [2020-11-22 13:02:23,823 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-22 13:02:23,823 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [902829012] [2020-11-22 13:02:23,823 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-22 13:02:23,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 13:02:23,947 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-22 13:02:23,947 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [902829012] [2020-11-22 13:02:23,948 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-22 13:02:23,948 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-11-22 13:02:23,948 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [284659822] [2020-11-22 13:02:23,948 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-11-22 13:02:23,948 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-22 13:02:23,949 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-11-22 13:02:23,949 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-11-22 13:02:23,949 INFO L87 Difference]: Start difference. First operand 11 states and 12 transitions. Second operand 6 states. [2020-11-22 13:02:24,035 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-22 13:02:24,036 INFO L93 Difference]: Finished difference Result 19 states and 20 transitions. [2020-11-22 13:02:24,036 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-11-22 13:02:24,036 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 6 [2020-11-22 13:02:24,036 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-22 13:02:24,037 INFO L225 Difference]: With dead ends: 19 [2020-11-22 13:02:24,037 INFO L226 Difference]: Without dead ends: 19 [2020-11-22 13:02:24,037 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2020-11-22 13:02:24,037 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-11-22 13:02:24,039 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 15. [2020-11-22 13:02:24,039 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-11-22 13:02:24,039 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2020-11-22 13:02:24,039 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 6 [2020-11-22 13:02:24,039 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-22 13:02:24,039 INFO L481 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2020-11-22 13:02:24,039 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-11-22 13:02:24,040 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2020-11-22 13:02:24,040 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2020-11-22 13:02:24,040 INFO L414 BasicCegarLoop]: Found error trace [2020-11-22 13:02:24,040 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2020-11-22 13:02:24,040 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-11-22 13:02:24,040 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]=== [2020-11-22 13:02:24,041 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-22 13:02:24,041 INFO L82 PathProgramCache]: Analyzing trace with hash 211727863, now seen corresponding path program 1 times [2020-11-22 13:02:24,041 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-22 13:02:24,041 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [67199759] [2020-11-22 13:02:24,041 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-22 13:02:24,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 13:02:24,086 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-22 13:02:24,086 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [67199759] [2020-11-22 13:02:24,086 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-22 13:02:24,086 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-11-22 13:02:24,086 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [268960360] [2020-11-22 13:02:24,086 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-11-22 13:02:24,087 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-22 13:02:24,087 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-11-22 13:02:24,087 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-11-22 13:02:24,087 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand 4 states. [2020-11-22 13:02:24,100 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-22 13:02:24,100 INFO L93 Difference]: Finished difference Result 14 states and 16 transitions. [2020-11-22 13:02:24,101 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-11-22 13:02:24,101 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 7 [2020-11-22 13:02:24,101 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-22 13:02:24,101 INFO L225 Difference]: With dead ends: 14 [2020-11-22 13:02:24,101 INFO L226 Difference]: Without dead ends: 9 [2020-11-22 13:02:24,102 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 [2020-11-22 13:02:24,102 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2020-11-22 13:02:24,102 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 9. [2020-11-22 13:02:24,103 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 9 states. [2020-11-22 13:02:24,103 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 10 transitions. [2020-11-22 13:02:24,103 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 10 transitions. Word has length 7 [2020-11-22 13:02:24,103 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-22 13:02:24,103 INFO L481 AbstractCegarLoop]: Abstraction has 9 states and 10 transitions. [2020-11-22 13:02:24,103 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-11-22 13:02:24,103 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 10 transitions. [2020-11-22 13:02:24,103 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2020-11-22 13:02:24,103 INFO L414 BasicCegarLoop]: Found error trace [2020-11-22 13:02:24,104 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2020-11-22 13:02:24,104 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-11-22 13:02:24,104 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]=== [2020-11-22 13:02:24,104 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-22 13:02:24,104 INFO L82 PathProgramCache]: Analyzing trace with hash 2013045642, now seen corresponding path program 1 times [2020-11-22 13:02:24,104 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-22 13:02:24,105 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [408892010] [2020-11-22 13:02:24,105 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-22 13:02:24,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 13:02:24,232 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-22 13:02:24,232 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [408892010] [2020-11-22 13:02:24,233 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [330249867] [2020-11-22 13:02:24,233 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_7f19bb21-c54c-4ae5-85f8-961a059818cd/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 [2020-11-22 13:02:24,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 13:02:24,291 INFO L263 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 22 conjunts are in the unsatisfiable core [2020-11-22 13:02:24,293 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-22 13:02:24,438 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-22 13:02:24,438 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-22 13:02:24,582 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-22 13:02:24,583 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [902899172] [2020-11-22 13:02:24,586 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2020-11-22 13:02:24,586 INFO L166 IcfgInterpreter]: Building call graph [2020-11-22 13:02:24,587 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-11-22 13:02:24,587 INFO L176 IcfgInterpreter]: Starting interpretation [2020-11-22 13:02:24,587 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-11-22 13:02:24,728 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-11-22 13:02:25,192 INFO L180 IcfgInterpreter]: Interpretation finished [2020-11-22 13:02:25,420 WARN L193 SmtUtils]: Spent 181.00 ms on a formula simplification. DAG size of input: 79 DAG size of output: 44 [2020-11-22 13:02:26,076 WARN L193 SmtUtils]: Spent 300.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 64 [2020-11-22 13:02:26,216 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 44 DAG size of output: 38 [2020-11-22 13:02:26,217 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-11-22 13:02:26,217 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-22 13:02:26,217 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 15 [2020-11-22 13:02:26,217 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [221977848] [2020-11-22 13:02:26,218 INFO L461 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-11-22 13:02:26,218 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-22 13:02:26,218 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-11-22 13:02:26,219 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=427, Unknown=0, NotChecked=0, Total=506 [2020-11-22 13:02:26,219 INFO L87 Difference]: Start difference. First operand 9 states and 10 transitions. Second operand 17 states. [2020-11-22 13:02:26,408 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-22 13:02:26,408 INFO L93 Difference]: Finished difference Result 13 states and 14 transitions. [2020-11-22 13:02:26,409 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-11-22 13:02:26,409 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 8 [2020-11-22 13:02:26,409 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-22 13:02:26,409 INFO L225 Difference]: With dead ends: 13 [2020-11-22 13:02:26,409 INFO L226 Difference]: Without dead ends: 13 [2020-11-22 13:02:26,410 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 179 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=132, Invalid=624, Unknown=0, NotChecked=0, Total=756 [2020-11-22 13:02:26,410 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2020-11-22 13:02:26,411 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 11. [2020-11-22 13:02:26,411 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2020-11-22 13:02:26,412 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 12 transitions. [2020-11-22 13:02:26,412 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 12 transitions. Word has length 8 [2020-11-22 13:02:26,412 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-22 13:02:26,412 INFO L481 AbstractCegarLoop]: Abstraction has 11 states and 12 transitions. [2020-11-22 13:02:26,412 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-11-22 13:02:26,412 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 12 transitions. [2020-11-22 13:02:26,412 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-11-22 13:02:26,412 INFO L414 BasicCegarLoop]: Found error trace [2020-11-22 13:02:26,413 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1] [2020-11-22 13:02:26,613 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2020-11-22 13:02:26,613 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]=== [2020-11-22 13:02:26,614 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-22 13:02:26,614 INFO L82 PathProgramCache]: Analyzing trace with hash 1801578643, now seen corresponding path program 2 times [2020-11-22 13:02:26,614 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-22 13:02:26,614 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1807109584] [2020-11-22 13:02:26,614 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-22 13:02:26,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 13:02:26,874 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-22 13:02:26,874 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1807109584] [2020-11-22 13:02:26,874 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1386388295] [2020-11-22 13:02:26,874 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_7f19bb21-c54c-4ae5-85f8-961a059818cd/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 [2020-11-22 13:02:26,938 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2020-11-22 13:02:26,938 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-22 13:02:26,940 INFO L263 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 27 conjunts are in the unsatisfiable core [2020-11-22 13:02:26,942 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-22 13:02:27,154 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-22 13:02:27,155 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-22 13:02:27,333 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-22 13:02:27,333 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1051836378] [2020-11-22 13:02:27,335 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2020-11-22 13:02:27,335 INFO L166 IcfgInterpreter]: Building call graph [2020-11-22 13:02:27,335 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-11-22 13:02:27,336 INFO L176 IcfgInterpreter]: Starting interpretation [2020-11-22 13:02:27,336 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-11-22 13:02:27,455 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-11-22 13:02:27,829 INFO L180 IcfgInterpreter]: Interpretation finished [2020-11-22 13:02:28,073 WARN L193 SmtUtils]: Spent 192.00 ms on a formula simplification. DAG size of input: 79 DAG size of output: 44 [2020-11-22 13:02:28,683 WARN L193 SmtUtils]: Spent 299.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 64 [2020-11-22 13:02:28,815 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-11-22 13:02:28,816 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-22 13:02:28,816 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 18 [2020-11-22 13:02:28,816 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1043558591] [2020-11-22 13:02:28,816 INFO L461 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-11-22 13:02:28,816 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-22 13:02:28,817 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-11-22 13:02:28,817 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=516, Unknown=0, NotChecked=0, Total=600 [2020-11-22 13:02:28,817 INFO L87 Difference]: Start difference. First operand 11 states and 12 transitions. Second operand 19 states. [2020-11-22 13:02:28,994 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-22 13:02:28,994 INFO L93 Difference]: Finished difference Result 19 states and 20 transitions. [2020-11-22 13:02:28,994 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-11-22 13:02:28,994 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 10 [2020-11-22 13:02:28,994 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-22 13:02:28,995 INFO L225 Difference]: With dead ends: 19 [2020-11-22 13:02:28,995 INFO L226 Difference]: Without dead ends: 14 [2020-11-22 13:02:28,995 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 11 SyntacticMatches, 3 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 2 DeprecatedPredicates, 256 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=140, Invalid=730, Unknown=0, NotChecked=0, Total=870 [2020-11-22 13:02:28,995 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-11-22 13:02:28,997 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 13. [2020-11-22 13:02:28,997 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2020-11-22 13:02:28,997 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2020-11-22 13:02:28,997 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 10 [2020-11-22 13:02:28,997 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-22 13:02:28,997 INFO L481 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2020-11-22 13:02:28,997 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-11-22 13:02:28,997 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2020-11-22 13:02:28,998 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-11-22 13:02:28,998 INFO L414 BasicCegarLoop]: Found error trace [2020-11-22 13:02:28,998 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1] [2020-11-22 13:02:29,198 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable71,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-22 13:02:29,198 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]=== [2020-11-22 13:02:29,199 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-22 13:02:29,199 INFO L82 PathProgramCache]: Analyzing trace with hash -819315383, now seen corresponding path program 3 times [2020-11-22 13:02:29,199 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-22 13:02:29,199 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [479415163] [2020-11-22 13:02:29,199 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-22 13:02:29,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 13:02:29,292 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-22 13:02:29,293 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [479415163] [2020-11-22 13:02:29,293 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [479296119] [2020-11-22 13:02:29,293 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_7f19bb21-c54c-4ae5-85f8-961a059818cd/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 [2020-11-22 13:02:29,367 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-11-22 13:02:29,368 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-22 13:02:29,369 INFO L263 TraceCheckSpWp]: Trace formula consists of 86 conjuncts, 23 conjunts are in the unsatisfiable core [2020-11-22 13:02:29,371 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-22 13:02:29,427 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 1 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-22 13:02:29,427 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-22 13:02:29,549 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 1 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-22 13:02:29,549 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [643201081] [2020-11-22 13:02:29,551 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2020-11-22 13:02:29,551 INFO L166 IcfgInterpreter]: Building call graph [2020-11-22 13:02:29,551 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-11-22 13:02:29,551 INFO L176 IcfgInterpreter]: Starting interpretation [2020-11-22 13:02:29,551 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-11-22 13:02:29,681 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-11-22 13:02:30,055 INFO L180 IcfgInterpreter]: Interpretation finished [2020-11-22 13:02:30,280 WARN L193 SmtUtils]: Spent 173.00 ms on a formula simplification. DAG size of input: 79 DAG size of output: 44 [2020-11-22 13:02:30,846 WARN L193 SmtUtils]: Spent 247.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 64 [2020-11-22 13:02:30,986 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 44 DAG size of output: 38 [2020-11-22 13:02:30,987 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-11-22 13:02:30,987 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-22 13:02:30,987 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 14 [2020-11-22 13:02:30,987 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [248705411] [2020-11-22 13:02:30,987 INFO L461 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-11-22 13:02:30,988 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-22 13:02:30,988 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-11-22 13:02:30,988 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=392, Unknown=0, NotChecked=0, Total=462 [2020-11-22 13:02:30,988 INFO L87 Difference]: Start difference. First operand 13 states and 14 transitions. Second operand 16 states. [2020-11-22 13:02:31,245 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-22 13:02:31,245 INFO L93 Difference]: Finished difference Result 16 states and 17 transitions. [2020-11-22 13:02:31,245 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-11-22 13:02:31,245 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 12 [2020-11-22 13:02:31,246 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-22 13:02:31,246 INFO L225 Difference]: With dead ends: 16 [2020-11-22 13:02:31,246 INFO L226 Difference]: Without dead ends: 16 [2020-11-22 13:02:31,246 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 19 SyntacticMatches, 2 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 128 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=124, Invalid=578, Unknown=0, NotChecked=0, Total=702 [2020-11-22 13:02:31,247 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-11-22 13:02:31,248 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 15. [2020-11-22 13:02:31,248 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-11-22 13:02:31,249 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2020-11-22 13:02:31,249 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 12 [2020-11-22 13:02:31,249 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-22 13:02:31,249 INFO L481 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2020-11-22 13:02:31,249 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-11-22 13:02:31,249 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2020-11-22 13:02:31,249 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-11-22 13:02:31,250 INFO L414 BasicCegarLoop]: Found error trace [2020-11-22 13:02:31,250 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1] [2020-11-22 13:02:31,450 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable115,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-22 13:02:31,451 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]=== [2020-11-22 13:02:31,451 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-22 13:02:31,451 INFO L82 PathProgramCache]: Analyzing trace with hash -1383068014, now seen corresponding path program 4 times [2020-11-22 13:02:31,451 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-22 13:02:31,451 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [310433097] [2020-11-22 13:02:31,451 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-22 13:02:31,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 13:02:31,654 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 3 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-22 13:02:31,654 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [310433097] [2020-11-22 13:02:31,654 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1820049062] [2020-11-22 13:02:31,655 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_7f19bb21-c54c-4ae5-85f8-961a059818cd/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 [2020-11-22 13:02:31,714 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 13:02:31,716 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 29 conjunts are in the unsatisfiable core [2020-11-22 13:02:31,717 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-22 13:02:32,113 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-22 13:02:32,114 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-22 13:02:32,559 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 4 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-22 13:02:32,559 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2048918897] [2020-11-22 13:02:32,561 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2020-11-22 13:02:32,561 INFO L166 IcfgInterpreter]: Building call graph [2020-11-22 13:02:32,562 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-11-22 13:02:32,562 INFO L176 IcfgInterpreter]: Starting interpretation [2020-11-22 13:02:32,562 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-11-22 13:02:32,888 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-11-22 13:02:32,943 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-11-22 13:02:33,116 INFO L180 IcfgInterpreter]: Interpretation finished [2020-11-22 13:02:33,280 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 42 [2020-11-22 13:02:33,564 WARN L193 SmtUtils]: Spent 204.00 ms on a formula simplification. DAG size of input: 77 DAG size of output: 60 [2020-11-22 13:02:33,933 WARN L193 SmtUtils]: Spent 169.00 ms on a formula simplification. DAG size of input: 79 DAG size of output: 62 [2020-11-22 13:02:34,035 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-11-22 13:02:34,036 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-22 13:02:34,036 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 26 [2020-11-22 13:02:34,036 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [29587988] [2020-11-22 13:02:34,036 INFO L461 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-11-22 13:02:34,036 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-22 13:02:34,037 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-11-22 13:02:34,037 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=887, Unknown=0, NotChecked=0, Total=992 [2020-11-22 13:02:34,037 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand 27 states. [2020-11-22 13:02:34,466 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-22 13:02:34,466 INFO L93 Difference]: Finished difference Result 25 states and 26 transitions. [2020-11-22 13:02:34,466 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-11-22 13:02:34,466 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 14 [2020-11-22 13:02:34,467 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-22 13:02:34,467 INFO L225 Difference]: With dead ends: 25 [2020-11-22 13:02:34,467 INFO L226 Difference]: Without dead ends: 18 [2020-11-22 13:02:34,468 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 20 SyntacticMatches, 1 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 239 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=228, Invalid=1412, Unknown=0, NotChecked=0, Total=1640 [2020-11-22 13:02:34,468 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-11-22 13:02:34,469 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 17. [2020-11-22 13:02:34,469 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-11-22 13:02:34,469 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2020-11-22 13:02:34,470 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 14 [2020-11-22 13:02:34,470 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-22 13:02:34,470 INFO L481 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2020-11-22 13:02:34,470 INFO L482 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-11-22 13:02:34,470 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2020-11-22 13:02:34,470 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-11-22 13:02:34,470 INFO L414 BasicCegarLoop]: Found error trace [2020-11-22 13:02:34,470 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1] [2020-11-22 13:02:34,676 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable160 [2020-11-22 13:02:34,676 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]=== [2020-11-22 13:02:34,676 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-22 13:02:34,676 INFO L82 PathProgramCache]: Analyzing trace with hash -1760356280, now seen corresponding path program 5 times [2020-11-22 13:02:34,677 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-22 13:02:34,677 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [43685219] [2020-11-22 13:02:34,677 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-22 13:02:34,691 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 13:02:34,809 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 1 proven. 17 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-22 13:02:34,809 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [43685219] [2020-11-22 13:02:34,809 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1758553876] [2020-11-22 13:02:34,810 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_7f19bb21-c54c-4ae5-85f8-961a059818cd/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 [2020-11-22 13:02:34,863 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2020-11-22 13:02:34,863 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-22 13:02:34,864 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 30 conjunts are in the unsatisfiable core [2020-11-22 13:02:34,866 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-22 13:02:35,045 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 4 proven. 14 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-22 13:02:35,045 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-22 13:02:35,291 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 9 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-22 13:02:35,291 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [331874718] [2020-11-22 13:02:35,292 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2020-11-22 13:02:35,293 INFO L166 IcfgInterpreter]: Building call graph [2020-11-22 13:02:35,293 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-11-22 13:02:35,293 INFO L176 IcfgInterpreter]: Starting interpretation [2020-11-22 13:02:35,293 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-11-22 13:02:35,594 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-11-22 13:02:35,603 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-11-22 13:02:35,783 INFO L180 IcfgInterpreter]: Interpretation finished [2020-11-22 13:02:35,928 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 42 [2020-11-22 13:02:36,184 WARN L193 SmtUtils]: Spent 197.00 ms on a formula simplification. DAG size of input: 77 DAG size of output: 60 [2020-11-22 13:02:36,443 WARN L193 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 79 DAG size of output: 62 [2020-11-22 13:02:36,615 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-11-22 13:02:36,615 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-22 13:02:36,616 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 27 [2020-11-22 13:02:36,616 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [390789775] [2020-11-22 13:02:36,616 INFO L461 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-11-22 13:02:36,616 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-22 13:02:36,617 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-11-22 13:02:36,617 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=143, Invalid=979, Unknown=0, NotChecked=0, Total=1122 [2020-11-22 13:02:36,617 INFO L87 Difference]: Start difference. First operand 17 states and 18 transitions. Second operand 29 states. [2020-11-22 13:02:36,957 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-22 13:02:36,957 INFO L93 Difference]: Finished difference Result 20 states and 21 transitions. [2020-11-22 13:02:36,957 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-11-22 13:02:36,957 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 16 [2020-11-22 13:02:36,957 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-22 13:02:36,958 INFO L225 Difference]: With dead ends: 20 [2020-11-22 13:02:36,958 INFO L226 Difference]: Without dead ends: 20 [2020-11-22 13:02:36,959 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 371 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=261, Invalid=1299, Unknown=0, NotChecked=0, Total=1560 [2020-11-22 13:02:36,959 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-11-22 13:02:36,960 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 19. [2020-11-22 13:02:36,960 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-11-22 13:02:36,960 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2020-11-22 13:02:36,960 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 16 [2020-11-22 13:02:36,961 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-22 13:02:36,961 INFO L481 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2020-11-22 13:02:36,961 INFO L482 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-11-22 13:02:36,961 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2020-11-22 13:02:36,961 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-11-22 13:02:36,961 INFO L414 BasicCegarLoop]: Found error trace [2020-11-22 13:02:36,961 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 1, 1, 1, 1] [2020-11-22 13:02:37,172 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable215,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-22 13:02:37,172 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]=== [2020-11-22 13:02:37,172 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-22 13:02:37,173 INFO L82 PathProgramCache]: Analyzing trace with hash 514729425, now seen corresponding path program 6 times [2020-11-22 13:02:37,173 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-22 13:02:37,173 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1763595626] [2020-11-22 13:02:37,173 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-22 13:02:37,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 13:02:37,341 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 4 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-22 13:02:37,341 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1763595626] [2020-11-22 13:02:37,342 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [162609882] [2020-11-22 13:02:37,342 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_7f19bb21-c54c-4ae5-85f8-961a059818cd/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 [2020-11-22 13:02:37,396 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-11-22 13:02:37,396 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-22 13:02:37,397 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 37 conjunts are in the unsatisfiable core [2020-11-22 13:02:37,398 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-22 13:02:37,565 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 4 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-22 13:02:37,565 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-22 13:02:37,730 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 4 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-22 13:02:37,731 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1037811798] [2020-11-22 13:02:37,732 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2020-11-22 13:02:37,733 INFO L166 IcfgInterpreter]: Building call graph [2020-11-22 13:02:37,733 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-11-22 13:02:37,733 INFO L176 IcfgInterpreter]: Starting interpretation [2020-11-22 13:02:37,733 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-11-22 13:02:38,048 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-11-22 13:02:38,068 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-11-22 13:02:38,197 INFO L180 IcfgInterpreter]: Interpretation finished [2020-11-22 13:02:38,493 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 77 DAG size of output: 60 [2020-11-22 13:02:38,744 WARN L193 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 79 DAG size of output: 62 [2020-11-22 13:02:38,854 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-11-22 13:02:38,854 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-22 13:02:38,854 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 22 [2020-11-22 13:02:38,854 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1060866960] [2020-11-22 13:02:38,855 INFO L461 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-11-22 13:02:38,855 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-22 13:02:38,855 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-11-22 13:02:38,856 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=677, Unknown=0, NotChecked=0, Total=756 [2020-11-22 13:02:38,856 INFO L87 Difference]: Start difference. First operand 19 states and 20 transitions. Second operand 23 states. [2020-11-22 13:02:39,176 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-22 13:02:39,176 INFO L93 Difference]: Finished difference Result 31 states and 32 transitions. [2020-11-22 13:02:39,176 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-11-22 13:02:39,176 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 18 [2020-11-22 13:02:39,176 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-22 13:02:39,177 INFO L225 Difference]: With dead ends: 31 [2020-11-22 13:02:39,177 INFO L226 Difference]: Without dead ends: 22 [2020-11-22 13:02:39,177 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 34 SyntacticMatches, 5 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 212 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=161, Invalid=1171, Unknown=0, NotChecked=0, Total=1332 [2020-11-22 13:02:39,177 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-11-22 13:02:39,180 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2020-11-22 13:02:39,180 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-11-22 13:02:39,181 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2020-11-22 13:02:39,181 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 18 [2020-11-22 13:02:39,181 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-22 13:02:39,181 INFO L481 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2020-11-22 13:02:39,181 INFO L482 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-11-22 13:02:39,181 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2020-11-22 13:02:39,181 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-11-22 13:02:39,181 INFO L414 BasicCegarLoop]: Found error trace [2020-11-22 13:02:39,181 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 1, 1, 1, 1] [2020-11-22 13:02:39,381 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable270,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-22 13:02:39,382 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]=== [2020-11-22 13:02:39,382 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-22 13:02:39,382 INFO L82 PathProgramCache]: Analyzing trace with hash 394880135, now seen corresponding path program 7 times [2020-11-22 13:02:39,382 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-22 13:02:39,382 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [317170580] [2020-11-22 13:02:39,382 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-22 13:02:39,394 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 13:02:39,524 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 4 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-22 13:02:39,524 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [317170580] [2020-11-22 13:02:39,524 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [512786137] [2020-11-22 13:02:39,524 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_7f19bb21-c54c-4ae5-85f8-961a059818cd/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 [2020-11-22 13:02:39,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 13:02:39,564 INFO L263 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 37 conjunts are in the unsatisfiable core [2020-11-22 13:02:39,566 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-22 13:02:39,820 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 9 proven. 23 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-22 13:02:39,820 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-22 13:02:40,098 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 16 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-22 13:02:40,098 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1733471438] [2020-11-22 13:02:40,099 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2020-11-22 13:02:40,100 INFO L166 IcfgInterpreter]: Building call graph [2020-11-22 13:02:40,100 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-11-22 13:02:40,100 INFO L176 IcfgInterpreter]: Starting interpretation [2020-11-22 13:02:40,100 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-11-22 13:02:40,189 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-11-22 13:02:40,454 INFO L180 IcfgInterpreter]: Interpretation finished [2020-11-22 13:02:40,618 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 79 DAG size of output: 44 [2020-11-22 13:02:41,150 WARN L193 SmtUtils]: Spent 210.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 64 [2020-11-22 13:02:41,256 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-11-22 13:02:41,257 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-22 13:02:41,257 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 33 [2020-11-22 13:02:41,257 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [359003158] [2020-11-22 13:02:41,257 INFO L461 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-11-22 13:02:41,257 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-22 13:02:41,258 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-11-22 13:02:41,258 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=196, Invalid=1444, Unknown=0, NotChecked=0, Total=1640 [2020-11-22 13:02:41,258 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 35 states. [2020-11-22 13:02:41,558 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-22 13:02:41,558 INFO L93 Difference]: Finished difference Result 24 states and 25 transitions. [2020-11-22 13:02:41,558 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-11-22 13:02:41,558 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 20 [2020-11-22 13:02:41,559 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-22 13:02:41,559 INFO L225 Difference]: With dead ends: 24 [2020-11-22 13:02:41,559 INFO L226 Difference]: Without dead ends: 24 [2020-11-22 13:02:41,560 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 651 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=348, Invalid=1908, Unknown=0, NotChecked=0, Total=2256 [2020-11-22 13:02:41,560 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-11-22 13:02:41,562 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 23. [2020-11-22 13:02:41,562 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-11-22 13:02:41,562 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2020-11-22 13:02:41,562 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 20 [2020-11-22 13:02:41,562 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-22 13:02:41,562 INFO L481 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2020-11-22 13:02:41,563 INFO L482 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-11-22 13:02:41,563 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2020-11-22 13:02:41,563 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-11-22 13:02:41,563 INFO L414 BasicCegarLoop]: Found error trace [2020-11-22 13:02:41,563 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 1, 1, 1, 1] [2020-11-22 13:02:41,768 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable325 [2020-11-22 13:02:41,770 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]=== [2020-11-22 13:02:41,770 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-22 13:02:41,770 INFO L82 PathProgramCache]: Analyzing trace with hash 1522687568, now seen corresponding path program 8 times [2020-11-22 13:02:41,770 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-22 13:02:41,770 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [902363179] [2020-11-22 13:02:41,770 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-22 13:02:41,787 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 13:02:41,990 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 5 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-22 13:02:41,990 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [902363179] [2020-11-22 13:02:41,990 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [548070033] [2020-11-22 13:02:41,991 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_7f19bb21-c54c-4ae5-85f8-961a059818cd/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 [2020-11-22 13:02:42,077 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2020-11-22 13:02:42,077 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-22 13:02:42,079 INFO L263 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 32 conjunts are in the unsatisfiable core [2020-11-22 13:02:42,080 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-22 13:02:42,202 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2020-11-22 13:02:42,203 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-22 13:02:42,417 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2020-11-22 13:02:42,417 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2066646350] [2020-11-22 13:02:42,421 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2020-11-22 13:02:42,424 INFO L166 IcfgInterpreter]: Building call graph [2020-11-22 13:02:42,424 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-11-22 13:02:42,424 INFO L176 IcfgInterpreter]: Starting interpretation [2020-11-22 13:02:42,424 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-11-22 13:02:42,729 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-11-22 13:02:42,739 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-11-22 13:02:42,875 INFO L180 IcfgInterpreter]: Interpretation finished [2020-11-22 13:02:43,183 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 77 DAG size of output: 60 [2020-11-22 13:02:43,464 WARN L193 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 79 DAG size of output: 62 [2020-11-22 13:02:43,637 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-11-22 13:02:43,637 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-22 13:02:43,637 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 4, 4] total 22 [2020-11-22 13:02:43,637 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1099326661] [2020-11-22 13:02:43,637 INFO L461 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-11-22 13:02:43,638 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-22 13:02:43,638 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-11-22 13:02:43,638 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=694, Unknown=0, NotChecked=0, Total=756 [2020-11-22 13:02:43,638 INFO L87 Difference]: Start difference. First operand 23 states and 24 transitions. Second operand 23 states. [2020-11-22 13:02:44,454 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-22 13:02:44,454 INFO L93 Difference]: Finished difference Result 36 states and 37 transitions. [2020-11-22 13:02:44,454 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-11-22 13:02:44,454 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 22 [2020-11-22 13:02:44,454 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-22 13:02:44,454 INFO L225 Difference]: With dead ends: 36 [2020-11-22 13:02:44,454 INFO L226 Difference]: Without dead ends: 0 [2020-11-22 13:02:44,455 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 52 SyntacticMatches, 1 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 209 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=299, Invalid=1957, Unknown=0, NotChecked=0, Total=2256 [2020-11-22 13:02:44,455 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-11-22 13:02:44,455 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-11-22 13:02:44,455 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-11-22 13:02:44,456 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-11-22 13:02:44,456 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 22 [2020-11-22 13:02:44,456 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-22 13:02:44,456 INFO L481 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-11-22 13:02:44,456 INFO L482 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-11-22 13:02:44,456 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-11-22 13:02:44,456 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-11-22 13:02:44,656 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable369,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-22 13:02:44,659 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 22.11 01:02:44 BoogieIcfgContainer [2020-11-22 13:02:44,660 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-11-22 13:02:44,660 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-11-22 13:02:44,660 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-11-22 13:02:44,660 INFO L275 PluginConnector]: Witness Printer initialized [2020-11-22 13:02:44,661 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.11 01:02:21" (3/4) ... [2020-11-22 13:02:44,663 INFO L137 WitnessPrinter]: Generating witness for correct program [2020-11-22 13:02:44,670 INFO L902 BoogieBacktranslator]: Reduced CFG by removing 13 nodes and edges [2020-11-22 13:02:44,671 INFO L902 BoogieBacktranslator]: Reduced CFG by removing 6 nodes and edges [2020-11-22 13:02:44,671 INFO L902 BoogieBacktranslator]: Reduced CFG by removing 2 nodes and edges [2020-11-22 13:02:44,707 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/run_dir_7f19bb21-c54c-4ae5-85f8-961a059818cd/bin/utaipan/witness.graphml [2020-11-22 13:02:44,708 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-11-22 13:02:44,709 INFO L168 Benchmark]: Toolchain (without parser) took 24363.16 ms. Allocated memory was 94.4 MB in the beginning and 283.1 MB in the end (delta: 188.7 MB). Free memory was 61.1 MB in the beginning and 220.4 MB in the end (delta: -159.4 MB). Peak memory consumption was 29.5 MB. Max. memory is 16.1 GB. [2020-11-22 13:02:44,709 INFO L168 Benchmark]: CDTParser took 0.22 ms. Allocated memory is still 77.6 MB. Free memory was 58.5 MB in the beginning and 58.5 MB in the end (delta: 22.2 kB). There was no memory consumed. Max. memory is 16.1 GB. [2020-11-22 13:02:44,710 INFO L168 Benchmark]: CACSL2BoogieTranslator took 407.60 ms. Allocated memory is still 94.4 MB. Free memory was 60.7 MB in the beginning and 61.7 MB in the end (delta: -991.7 kB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. [2020-11-22 13:02:44,710 INFO L168 Benchmark]: Boogie Procedure Inliner took 36.86 ms. Allocated memory is still 94.4 MB. Free memory was 61.3 MB in the beginning and 59.9 MB in the end (delta: 1.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-11-22 13:02:44,710 INFO L168 Benchmark]: Boogie Preprocessor took 22.99 ms. Allocated memory is still 94.4 MB. Free memory was 59.5 MB in the beginning and 58.3 MB in the end (delta: 1.2 MB). There was no memory consumed. Max. memory is 16.1 GB. [2020-11-22 13:02:44,711 INFO L168 Benchmark]: RCFGBuilder took 574.28 ms. Allocated memory is still 94.4 MB. Free memory was 58.3 MB in the beginning and 68.6 MB in the end (delta: -10.3 MB). Peak memory consumption was 22.7 MB. Max. memory is 16.1 GB. [2020-11-22 13:02:44,711 INFO L168 Benchmark]: TraceAbstraction took 23264.23 ms. Allocated memory was 94.4 MB in the beginning and 283.1 MB in the end (delta: 188.7 MB). Free memory was 68.0 MB in the beginning and 223.8 MB in the end (delta: -155.8 MB). Peak memory consumption was 32.2 MB. Max. memory is 16.1 GB. [2020-11-22 13:02:44,713 INFO L168 Benchmark]: Witness Printer took 47.71 ms. Allocated memory is still 283.1 MB. Free memory was 223.8 MB in the beginning and 220.4 MB in the end (delta: 3.3 MB). Peak memory consumption was 4.2 MB. Max. memory is 16.1 GB. [2020-11-22 13:02:44,716 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.22 ms. Allocated memory is still 77.6 MB. Free memory was 58.5 MB in the beginning and 58.5 MB in the end (delta: 22.2 kB). There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 407.60 ms. Allocated memory is still 94.4 MB. Free memory was 60.7 MB in the beginning and 61.7 MB in the end (delta: -991.7 kB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 36.86 ms. Allocated memory is still 94.4 MB. Free memory was 61.3 MB in the beginning and 59.9 MB in the end (delta: 1.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Boogie Preprocessor took 22.99 ms. Allocated memory is still 94.4 MB. Free memory was 59.5 MB in the beginning and 58.3 MB in the end (delta: 1.2 MB). There was no memory consumed. Max. memory is 16.1 GB. * RCFGBuilder took 574.28 ms. Allocated memory is still 94.4 MB. Free memory was 58.3 MB in the beginning and 68.6 MB in the end (delta: -10.3 MB). Peak memory consumption was 22.7 MB. Max. memory is 16.1 GB. * TraceAbstraction took 23264.23 ms. Allocated memory was 94.4 MB in the beginning and 283.1 MB in the end (delta: 188.7 MB). Free memory was 68.0 MB in the beginning and 223.8 MB in the end (delta: -155.8 MB). Peak memory consumption was 32.2 MB. Max. memory is 16.1 GB. * Witness Printer took 47.71 ms. Allocated memory is still 283.1 MB. Free memory was 223.8 MB in the beginning and 220.4 MB in the end (delta: 3.3 MB). Peak memory consumption was 4.2 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: 23.2s, OverallIterations: 16, TraceHistogramMax: 5, AutomataDifference: 3.4s, 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, 1.0s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 529 GetRequests, 202 SyntacticMatches, 13 SemanticMatches, 314 ConstructedPredicates, 0 IntricatePredicates, 3 DeprecatedPredicates, 2267 ImplicationChecksByTransitivity, 13.2s 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: 0.0s SsaConstructionTime, 0.4s SatisfiabilityAnalysisTime, 5.2s 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...