./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 7b2dab56 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/run_dir_97282af7-25f2-48d5-aead-ef44704a1e15/bin/utaipan/data/config -Xmx15G -Xms4m -jar /tmp/vcloud-vcloud-master/worker/run_dir_97282af7-25f2-48d5-aead-ef44704a1e15/bin/utaipan/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_97282af7-25f2-48d5-aead-ef44704a1e15/bin/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_97282af7-25f2-48d5-aead-ef44704a1e15/bin/utaipan/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/array-memsafety/openbsd_cstrlen-alloca-1.i -s /tmp/vcloud-vcloud-master/worker/run_dir_97282af7-25f2-48d5-aead-ef44704a1e15/bin/utaipan/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_97282af7-25f2-48d5-aead-ef44704a1e15/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 0.2.0-7b2dab5 [2020-12-09 20:42:51,630 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-12-09 20:42:51,631 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-12-09 20:42:51,658 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-12-09 20:42:51,659 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-12-09 20:42:51,660 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-12-09 20:42:51,662 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-12-09 20:42:51,664 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-12-09 20:42:51,666 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-12-09 20:42:51,667 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-12-09 20:42:51,668 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-12-09 20:42:51,669 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-12-09 20:42:51,670 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-12-09 20:42:51,671 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-12-09 20:42:51,672 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-12-09 20:42:51,673 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-12-09 20:42:51,674 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-12-09 20:42:51,675 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-12-09 20:42:51,677 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-12-09 20:42:51,679 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-12-09 20:42:51,681 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-12-09 20:42:51,682 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-12-09 20:42:51,683 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-12-09 20:42:51,684 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-12-09 20:42:51,687 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-12-09 20:42:51,687 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-12-09 20:42:51,687 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-12-09 20:42:51,688 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-12-09 20:42:51,688 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-12-09 20:42:51,689 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-12-09 20:42:51,690 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-12-09 20:42:51,690 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-12-09 20:42:51,691 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-12-09 20:42:51,692 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-12-09 20:42:51,692 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-12-09 20:42:51,692 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-12-09 20:42:51,693 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-12-09 20:42:51,693 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-12-09 20:42:51,693 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-12-09 20:42:51,694 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-12-09 20:42:51,694 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-12-09 20:42:51,695 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/run_dir_97282af7-25f2-48d5-aead-ef44704a1e15/bin/utaipan/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2020-12-09 20:42:51,711 INFO L113 SettingsManager]: Loading preferences was successful [2020-12-09 20:42:51,711 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-12-09 20:42:51,712 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2020-12-09 20:42:51,712 INFO L138 SettingsManager]: * User list type=DISABLED [2020-12-09 20:42:51,712 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2020-12-09 20:42:51,712 INFO L138 SettingsManager]: * Explicit value domain=true [2020-12-09 20:42:51,712 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2020-12-09 20:42:51,712 INFO L138 SettingsManager]: * Octagon Domain=false [2020-12-09 20:42:51,712 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2020-12-09 20:42:51,713 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2020-12-09 20:42:51,713 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2020-12-09 20:42:51,713 INFO L138 SettingsManager]: * Interval Domain=false [2020-12-09 20:42:51,713 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2020-12-09 20:42:51,713 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2020-12-09 20:42:51,713 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2020-12-09 20:42:51,714 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-12-09 20:42:51,714 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-12-09 20:42:51,714 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-12-09 20:42:51,714 INFO L138 SettingsManager]: * sizeof long=4 [2020-12-09 20:42:51,714 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2020-12-09 20:42:51,714 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-12-09 20:42:51,714 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-12-09 20:42:51,714 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-12-09 20:42:51,714 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2020-12-09 20:42:51,715 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2020-12-09 20:42:51,715 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2020-12-09 20:42:51,715 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-12-09 20:42:51,715 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2020-12-09 20:42:51,715 INFO L138 SettingsManager]: * sizeof long double=12 [2020-12-09 20:42:51,715 INFO L138 SettingsManager]: * Use constant arrays=true [2020-12-09 20:42:51,715 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-12-09 20:42:51,715 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-12-09 20:42:51,715 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-12-09 20:42:51,715 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-12-09 20:42:51,716 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-12-09 20:42:51,716 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2020-12-09 20:42:51,716 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-12-09 20:42:51,716 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-12-09 20:42:51,716 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2020-12-09 20:42:51,716 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_97282af7-25f2-48d5-aead-ef44704a1e15/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud-vcloud-master/worker/run_dir_97282af7-25f2-48d5-aead-ef44704a1e15/bin/utaipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> b812e7d14425eea3a24125f5e2db40eadfc6c14c [2020-12-09 20:42:51,888 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-12-09 20:42:51,907 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-12-09 20:42:51,909 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-12-09 20:42:51,910 INFO L271 PluginConnector]: Initializing CDTParser... [2020-12-09 20:42:51,910 INFO L275 PluginConnector]: CDTParser initialized [2020-12-09 20:42:51,911 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_97282af7-25f2-48d5-aead-ef44704a1e15/bin/utaipan/../../sv-benchmarks/c/array-memsafety/openbsd_cstrlen-alloca-1.i [2020-12-09 20:42:51,950 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_97282af7-25f2-48d5-aead-ef44704a1e15/bin/utaipan/data/53f326f8c/d2b921d4ecf14ee39399918c4db5e789/FLAG1c2283430 [2020-12-09 20:42:52,346 INFO L306 CDTParser]: Found 1 translation units. [2020-12-09 20:42:52,346 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_97282af7-25f2-48d5-aead-ef44704a1e15/sv-benchmarks/c/array-memsafety/openbsd_cstrlen-alloca-1.i [2020-12-09 20:42:52,356 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_97282af7-25f2-48d5-aead-ef44704a1e15/bin/utaipan/data/53f326f8c/d2b921d4ecf14ee39399918c4db5e789/FLAG1c2283430 [2020-12-09 20:42:52,365 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_97282af7-25f2-48d5-aead-ef44704a1e15/bin/utaipan/data/53f326f8c/d2b921d4ecf14ee39399918c4db5e789 [2020-12-09 20:42:52,367 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-12-09 20:42:52,368 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-12-09 20:42:52,369 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-12-09 20:42:52,369 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-12-09 20:42:52,371 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-12-09 20:42:52,372 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 09.12 08:42:52" (1/1) ... [2020-12-09 20:42:52,373 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@20a99e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 08:42:52, skipping insertion in model container [2020-12-09 20:42:52,373 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 09.12 08:42:52" (1/1) ... [2020-12-09 20:42:52,378 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-12-09 20:42:52,404 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-12-09 20:42:52,570 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-09 20:42:52,576 INFO L203 MainTranslator]: Completed pre-run [2020-12-09 20:42:52,600 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-09 20:42:52,634 INFO L208 MainTranslator]: Completed translation [2020-12-09 20:42:52,634 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 08:42:52 WrapperNode [2020-12-09 20:42:52,635 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-12-09 20:42:52,635 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-12-09 20:42:52,636 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-12-09 20:42:52,636 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-12-09 20:42:52,641 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 08:42:52" (1/1) ... [2020-12-09 20:42:52,652 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 08:42:52" (1/1) ... [2020-12-09 20:42:52,667 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-12-09 20:42:52,668 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-12-09 20:42:52,668 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-12-09 20:42:52,668 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-12-09 20:42:52,674 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 08:42:52" (1/1) ... [2020-12-09 20:42:52,675 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 08:42:52" (1/1) ... [2020-12-09 20:42:52,678 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 08:42:52" (1/1) ... [2020-12-09 20:42:52,678 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 08:42:52" (1/1) ... [2020-12-09 20:42:52,683 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 08:42:52" (1/1) ... [2020-12-09 20:42:52,687 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 08:42:52" (1/1) ... [2020-12-09 20:42:52,688 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 08:42:52" (1/1) ... [2020-12-09 20:42:52,691 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-12-09 20:42:52,692 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-12-09 20:42:52,692 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-12-09 20:42:52,692 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-12-09 20:42:52,693 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 08:42:52" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_97282af7-25f2-48d5-aead-ef44704a1e15/bin/utaipan/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-12-09 20:42:52,750 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-12-09 20:42:52,750 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-12-09 20:42:52,750 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-12-09 20:42:52,750 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-12-09 20:42:52,750 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-12-09 20:42:52,750 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-12-09 20:42:53,035 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-12-09 20:42:53,035 INFO L299 CfgBuilder]: Removed 8 assume(true) statements. [2020-12-09 20:42:53,038 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.12 08:42:53 BoogieIcfgContainer [2020-12-09 20:42:53,039 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-12-09 20:42:53,040 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-12-09 20:42:53,040 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-12-09 20:42:53,043 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-12-09 20:42:53,043 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 09.12 08:42:52" (1/3) ... [2020-12-09 20:42:53,044 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@50d92e3d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 09.12 08:42:53, skipping insertion in model container [2020-12-09 20:42:53,044 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 08:42:52" (2/3) ... [2020-12-09 20:42:53,045 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@50d92e3d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 09.12 08:42:53, skipping insertion in model container [2020-12-09 20:42:53,045 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.12 08:42:53" (3/3) ... [2020-12-09 20:42:53,046 INFO L111 eAbstractionObserver]: Analyzing ICFG openbsd_cstrlen-alloca-1.i [2020-12-09 20:42:53,058 INFO L180 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-12-09 20:42:53,061 INFO L192 ceAbstractionStarter]: Appying trace abstraction to program that has 7 error locations. [2020-12-09 20:42:53,071 INFO L253 AbstractCegarLoop]: Starting to check reachability of 7 error locations. [2020-12-09 20:42:53,091 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-12-09 20:42:53,091 INFO L378 AbstractCegarLoop]: Hoare is false [2020-12-09 20:42:53,091 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-12-09 20:42:53,091 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-12-09 20:42:53,091 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-12-09 20:42:53,091 INFO L382 AbstractCegarLoop]: Difference is false [2020-12-09 20:42:53,091 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-12-09 20:42:53,092 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-12-09 20:42:53,101 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states. [2020-12-09 20:42:53,105 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2020-12-09 20:42:53,105 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 20:42:53,105 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1] [2020-12-09 20:42:53,106 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]=== [2020-12-09 20:42:53,109 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 20:42:53,110 INFO L82 PathProgramCache]: Analyzing trace with hash 91841, now seen corresponding path program 1 times [2020-12-09 20:42:53,116 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 20:42:53,117 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1716654035] [2020-12-09 20:42:53,117 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 20:42:53,183 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 20:42:53,224 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 20:42:53,225 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1716654035] [2020-12-09 20:42:53,226 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-09 20:42:53,226 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2020-12-09 20:42:53,227 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [352149866] [2020-12-09 20:42:53,231 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-12-09 20:42:53,231 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 20:42:53,244 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-12-09 20:42:53,244 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-09 20:42:53,246 INFO L87 Difference]: Start difference. First operand 16 states. Second operand 3 states. [2020-12-09 20:42:53,284 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 20:42:53,284 INFO L93 Difference]: Finished difference Result 14 states and 15 transitions. [2020-12-09 20:42:53,284 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-12-09 20:42:53,285 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 3 [2020-12-09 20:42:53,286 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 20:42:53,293 INFO L225 Difference]: With dead ends: 14 [2020-12-09 20:42:53,293 INFO L226 Difference]: Without dead ends: 13 [2020-12-09 20:42:53,294 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 [2020-12-09 20:42:53,310 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2020-12-09 20:42:53,319 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2020-12-09 20:42:53,320 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2020-12-09 20:42:53,320 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2020-12-09 20:42:53,321 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 3 [2020-12-09 20:42:53,321 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 20:42:53,322 INFO L481 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2020-12-09 20:42:53,322 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-12-09 20:42:53,322 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2020-12-09 20:42:53,322 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2020-12-09 20:42:53,322 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 20:42:53,322 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1] [2020-12-09 20:42:53,322 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-12-09 20:42:53,323 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]=== [2020-12-09 20:42:53,323 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 20:42:53,324 INFO L82 PathProgramCache]: Analyzing trace with hash 91842, now seen corresponding path program 1 times [2020-12-09 20:42:53,324 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 20:42:53,324 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [703372365] [2020-12-09 20:42:53,324 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 20:42:53,341 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 20:42:53,381 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 20:42:53,381 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [703372365] [2020-12-09 20:42:53,381 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-09 20:42:53,381 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-12-09 20:42:53,382 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1525570940] [2020-12-09 20:42:53,383 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-12-09 20:42:53,383 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 20:42:53,384 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-12-09 20:42:53,384 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-12-09 20:42:53,384 INFO L87 Difference]: Start difference. First operand 13 states and 14 transitions. Second operand 4 states. [2020-12-09 20:42:53,428 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 20:42:53,428 INFO L93 Difference]: Finished difference Result 24 states and 26 transitions. [2020-12-09 20:42:53,428 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-12-09 20:42:53,429 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 3 [2020-12-09 20:42:53,429 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 20:42:53,429 INFO L225 Difference]: With dead ends: 24 [2020-12-09 20:42:53,430 INFO L226 Difference]: Without dead ends: 24 [2020-12-09 20:42:53,430 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 [2020-12-09 20:42:53,431 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-12-09 20:42:53,433 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 15. [2020-12-09 20:42:53,433 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-12-09 20:42:53,434 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2020-12-09 20:42:53,434 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 3 [2020-12-09 20:42:53,434 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 20:42:53,434 INFO L481 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2020-12-09 20:42:53,434 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-12-09 20:42:53,435 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2020-12-09 20:42:53,435 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2020-12-09 20:42:53,435 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 20:42:53,435 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1] [2020-12-09 20:42:53,435 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-12-09 20:42:53,436 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]=== [2020-12-09 20:42:53,436 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 20:42:53,436 INFO L82 PathProgramCache]: Analyzing trace with hash 93215, now seen corresponding path program 1 times [2020-12-09 20:42:53,436 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 20:42:53,437 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1994439540] [2020-12-09 20:42:53,437 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 20:42:53,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 20:42:53,477 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 20:42:53,477 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1994439540] [2020-12-09 20:42:53,478 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-09 20:42:53,478 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2020-12-09 20:42:53,478 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2001974515] [2020-12-09 20:42:53,478 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-12-09 20:42:53,479 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 20:42:53,479 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-12-09 20:42:53,480 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-09 20:42:53,480 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand 3 states. [2020-12-09 20:42:53,491 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 20:42:53,491 INFO L93 Difference]: Finished difference Result 14 states and 16 transitions. [2020-12-09 20:42:53,492 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-12-09 20:42:53,492 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 3 [2020-12-09 20:42:53,492 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 20:42:53,492 INFO L225 Difference]: With dead ends: 14 [2020-12-09 20:42:53,493 INFO L226 Difference]: Without dead ends: 14 [2020-12-09 20:42:53,493 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 [2020-12-09 20:42:53,493 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-12-09 20:42:53,494 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-12-09 20:42:53,495 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-12-09 20:42:53,495 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 16 transitions. [2020-12-09 20:42:53,495 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 16 transitions. Word has length 3 [2020-12-09 20:42:53,495 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 20:42:53,495 INFO L481 AbstractCegarLoop]: Abstraction has 14 states and 16 transitions. [2020-12-09 20:42:53,495 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-12-09 20:42:53,495 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 16 transitions. [2020-12-09 20:42:53,496 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2020-12-09 20:42:53,496 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 20:42:53,496 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2020-12-09 20:42:53,496 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-12-09 20:42:53,496 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]=== [2020-12-09 20:42:53,497 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 20:42:53,497 INFO L82 PathProgramCache]: Analyzing trace with hash 2890506, now seen corresponding path program 1 times [2020-12-09 20:42:53,497 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 20:42:53,497 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [461355924] [2020-12-09 20:42:53,497 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 20:42:53,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 20:42:53,518 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 20:42:53,518 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [461355924] [2020-12-09 20:42:53,518 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-09 20:42:53,518 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-12-09 20:42:53,519 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [495794598] [2020-12-09 20:42:53,519 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-12-09 20:42:53,519 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 20:42:53,520 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-12-09 20:42:53,520 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-09 20:42:53,520 INFO L87 Difference]: Start difference. First operand 14 states and 16 transitions. Second operand 3 states. [2020-12-09 20:42:53,532 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 20:42:53,532 INFO L93 Difference]: Finished difference Result 13 states and 15 transitions. [2020-12-09 20:42:53,533 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-12-09 20:42:53,533 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 4 [2020-12-09 20:42:53,533 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 20:42:53,534 INFO L225 Difference]: With dead ends: 13 [2020-12-09 20:42:53,534 INFO L226 Difference]: Without dead ends: 13 [2020-12-09 20:42:53,534 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-09 20:42:53,534 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2020-12-09 20:42:53,535 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2020-12-09 20:42:53,536 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2020-12-09 20:42:53,536 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 15 transitions. [2020-12-09 20:42:53,536 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 15 transitions. Word has length 4 [2020-12-09 20:42:53,536 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 20:42:53,537 INFO L481 AbstractCegarLoop]: Abstraction has 13 states and 15 transitions. [2020-12-09 20:42:53,537 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-12-09 20:42:53,537 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 15 transitions. [2020-12-09 20:42:53,537 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2020-12-09 20:42:53,537 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 20:42:53,537 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2020-12-09 20:42:53,538 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-12-09 20:42:53,538 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]=== [2020-12-09 20:42:53,538 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 20:42:53,538 INFO L82 PathProgramCache]: Analyzing trace with hash 2890507, now seen corresponding path program 1 times [2020-12-09 20:42:53,538 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 20:42:53,539 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1455801199] [2020-12-09 20:42:53,539 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 20:42:53,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 20:42:53,570 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 20:42:53,570 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1455801199] [2020-12-09 20:42:53,570 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-09 20:42:53,571 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-12-09 20:42:53,571 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1685785477] [2020-12-09 20:42:53,571 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-12-09 20:42:53,571 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 20:42:53,572 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-12-09 20:42:53,572 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-12-09 20:42:53,572 INFO L87 Difference]: Start difference. First operand 13 states and 15 transitions. Second operand 4 states. [2020-12-09 20:42:53,599 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 20:42:53,599 INFO L93 Difference]: Finished difference Result 14 states and 16 transitions. [2020-12-09 20:42:53,600 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-12-09 20:42:53,600 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 4 [2020-12-09 20:42:53,600 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 20:42:53,600 INFO L225 Difference]: With dead ends: 14 [2020-12-09 20:42:53,600 INFO L226 Difference]: Without dead ends: 14 [2020-12-09 20:42:53,601 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 [2020-12-09 20:42:53,601 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-12-09 20:42:53,603 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-12-09 20:42:53,603 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-12-09 20:42:53,603 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 16 transitions. [2020-12-09 20:42:53,603 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 16 transitions. Word has length 4 [2020-12-09 20:42:53,604 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 20:42:53,604 INFO L481 AbstractCegarLoop]: Abstraction has 14 states and 16 transitions. [2020-12-09 20:42:53,604 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-12-09 20:42:53,604 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 16 transitions. [2020-12-09 20:42:53,604 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2020-12-09 20:42:53,605 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 20:42:53,605 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1] [2020-12-09 20:42:53,605 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-12-09 20:42:53,605 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]=== [2020-12-09 20:42:53,606 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 20:42:53,606 INFO L82 PathProgramCache]: Analyzing trace with hash 88298188, now seen corresponding path program 1 times [2020-12-09 20:42:53,606 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 20:42:53,606 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2081928660] [2020-12-09 20:42:53,606 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 20:42:53,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 20:42:53,655 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 20:42:53,656 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2081928660] [2020-12-09 20:42:53,656 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1526365051] [2020-12-09 20:42:53,656 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_97282af7-25f2-48d5-aead-ef44704a1e15/bin/utaipan/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 20:42:53,684 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 20:42:53,686 INFO L263 TraceCheckSpWp]: Trace formula consists of 39 conjuncts, 11 conjunts are in the unsatisfiable core [2020-12-09 20:42:53,690 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 20:42:53,729 INFO L382 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 [2020-12-09 20:42:53,730 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-09 20:42:53,735 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-09 20:42:53,736 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2020-12-09 20:42:53,737 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:13, output treesize:12 [2020-12-09 20:42:53,767 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 20:42:53,767 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 20:42:53,799 INFO L639 QuantifierPusher]: Distributing 2 disjuncts over 3 conjuncts [2020-12-09 20:42:53,822 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 20:42:53,822 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1624675919] [2020-12-09 20:42:53,836 INFO L159 IcfgInterpreter]: Started Sifa with 4 locations of interest [2020-12-09 20:42:53,836 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 20:42:53,839 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-09 20:42:53,843 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-09 20:42:53,844 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-09 20:42:54,207 INFO L180 IcfgInterpreter]: Interpretation finished [2020-12-09 20:42:54,451 WARN L197 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 63 [2020-12-09 20:42:54,517 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-12-09 20:42:54,517 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 20:42:54,517 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 7 [2020-12-09 20:42:54,517 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [998328278] [2020-12-09 20:42:54,518 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-12-09 20:42:54,518 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 20:42:54,518 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-12-09 20:42:54,518 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2020-12-09 20:42:54,518 INFO L87 Difference]: Start difference. First operand 14 states and 16 transitions. Second operand 9 states. [2020-12-09 20:42:54,607 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 20:42:54,607 INFO L93 Difference]: Finished difference Result 30 states and 33 transitions. [2020-12-09 20:42:54,607 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-12-09 20:42:54,608 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 5 [2020-12-09 20:42:54,608 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 20:42:54,608 INFO L225 Difference]: With dead ends: 30 [2020-12-09 20:42:54,608 INFO L226 Difference]: Without dead ends: 30 [2020-12-09 20:42:54,609 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 5 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=56, Invalid=154, Unknown=0, NotChecked=0, Total=210 [2020-12-09 20:42:54,609 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-12-09 20:42:54,610 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 11. [2020-12-09 20:42:54,610 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2020-12-09 20:42:54,610 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 12 transitions. [2020-12-09 20:42:54,610 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 12 transitions. Word has length 5 [2020-12-09 20:42:54,610 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 20:42:54,610 INFO L481 AbstractCegarLoop]: Abstraction has 11 states and 12 transitions. [2020-12-09 20:42:54,610 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-12-09 20:42:54,611 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 12 transitions. [2020-12-09 20:42:54,611 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2020-12-09 20:42:54,611 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 20:42:54,611 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2020-12-09 20:42:54,812 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2020-12-09 20:42:54,813 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]=== [2020-12-09 20:42:54,814 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 20:42:54,814 INFO L82 PathProgramCache]: Analyzing trace with hash -1517190188, now seen corresponding path program 1 times [2020-12-09 20:42:54,815 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 20:42:54,816 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [842882157] [2020-12-09 20:42:54,816 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 20:42:54,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 20:42:55,014 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 20:42:55,015 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [842882157] [2020-12-09 20:42:55,015 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-09 20:42:55,015 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-12-09 20:42:55,015 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [602989137] [2020-12-09 20:42:55,015 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-12-09 20:42:55,016 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 20:42:55,016 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-12-09 20:42:55,016 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-12-09 20:42:55,017 INFO L87 Difference]: Start difference. First operand 11 states and 12 transitions. Second operand 6 states. [2020-12-09 20:42:55,114 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 20:42:55,114 INFO L93 Difference]: Finished difference Result 19 states and 20 transitions. [2020-12-09 20:42:55,114 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-12-09 20:42:55,114 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 6 [2020-12-09 20:42:55,114 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 20:42:55,115 INFO L225 Difference]: With dead ends: 19 [2020-12-09 20:42:55,115 INFO L226 Difference]: Without dead ends: 19 [2020-12-09 20:42:55,115 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 [2020-12-09 20:42:55,115 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-12-09 20:42:55,116 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 15. [2020-12-09 20:42:55,116 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-12-09 20:42:55,117 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2020-12-09 20:42:55,117 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 6 [2020-12-09 20:42:55,117 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 20:42:55,117 INFO L481 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2020-12-09 20:42:55,117 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-12-09 20:42:55,117 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2020-12-09 20:42:55,117 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2020-12-09 20:42:55,118 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 20:42:55,118 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2020-12-09 20:42:55,118 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-12-09 20:42:55,118 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]=== [2020-12-09 20:42:55,118 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 20:42:55,118 INFO L82 PathProgramCache]: Analyzing trace with hash 211727863, now seen corresponding path program 1 times [2020-12-09 20:42:55,118 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 20:42:55,119 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [584962360] [2020-12-09 20:42:55,119 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 20:42:55,133 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 20:42:55,153 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 20:42:55,154 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [584962360] [2020-12-09 20:42:55,154 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-09 20:42:55,154 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-12-09 20:42:55,154 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1713504834] [2020-12-09 20:42:55,154 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-12-09 20:42:55,154 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 20:42:55,155 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-12-09 20:42:55,155 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-12-09 20:42:55,155 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand 4 states. [2020-12-09 20:42:55,165 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 20:42:55,165 INFO L93 Difference]: Finished difference Result 14 states and 16 transitions. [2020-12-09 20:42:55,165 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-12-09 20:42:55,165 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 7 [2020-12-09 20:42:55,165 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 20:42:55,166 INFO L225 Difference]: With dead ends: 14 [2020-12-09 20:42:55,166 INFO L226 Difference]: Without dead ends: 9 [2020-12-09 20:42:55,166 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 [2020-12-09 20:42:55,166 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2020-12-09 20:42:55,167 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 9. [2020-12-09 20:42:55,167 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 9 states. [2020-12-09 20:42:55,167 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 10 transitions. [2020-12-09 20:42:55,167 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 10 transitions. Word has length 7 [2020-12-09 20:42:55,167 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 20:42:55,168 INFO L481 AbstractCegarLoop]: Abstraction has 9 states and 10 transitions. [2020-12-09 20:42:55,168 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-12-09 20:42:55,168 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 10 transitions. [2020-12-09 20:42:55,168 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2020-12-09 20:42:55,168 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 20:42:55,168 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2020-12-09 20:42:55,168 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-12-09 20:42:55,168 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]=== [2020-12-09 20:42:55,169 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 20:42:55,169 INFO L82 PathProgramCache]: Analyzing trace with hash 2013045642, now seen corresponding path program 1 times [2020-12-09 20:42:55,169 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 20:42:55,169 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [635588401] [2020-12-09 20:42:55,169 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 20:42:55,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 20:42:55,232 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 20:42:55,232 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [635588401] [2020-12-09 20:42:55,232 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1170415817] [2020-12-09 20:42:55,232 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_97282af7-25f2-48d5-aead-ef44704a1e15/bin/utaipan/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 20:42:55,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 20:42:55,260 INFO L263 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 22 conjunts are in the unsatisfiable core [2020-12-09 20:42:55,261 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 20:42:55,329 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 20:42:55,329 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 20:42:55,414 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 20:42:55,414 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [303148647] [2020-12-09 20:42:55,416 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2020-12-09 20:42:55,416 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 20:42:55,416 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-09 20:42:55,417 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-09 20:42:55,417 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-09 20:42:55,676 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 20:42:55,683 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 20:42:55,779 INFO L180 IcfgInterpreter]: Interpretation finished [2020-12-09 20:42:56,041 WARN L197 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 60 [2020-12-09 20:42:56,279 WARN L197 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 76 DAG size of output: 62 [2020-12-09 20:42:56,368 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-12-09 20:42:56,369 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 20:42:56,369 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5, 5] total 16 [2020-12-09 20:42:56,369 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1618934215] [2020-12-09 20:42:56,369 INFO L461 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-12-09 20:42:56,369 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 20:42:56,370 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-12-09 20:42:56,370 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=427, Unknown=0, NotChecked=0, Total=506 [2020-12-09 20:42:56,370 INFO L87 Difference]: Start difference. First operand 9 states and 10 transitions. Second operand 18 states. [2020-12-09 20:42:56,502 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 20:42:56,502 INFO L93 Difference]: Finished difference Result 13 states and 14 transitions. [2020-12-09 20:42:56,502 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-12-09 20:42:56,502 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 8 [2020-12-09 20:42:56,503 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 20:42:56,503 INFO L225 Difference]: With dead ends: 13 [2020-12-09 20:42:56,503 INFO L226 Difference]: Without dead ends: 13 [2020-12-09 20:42:56,503 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 178 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=124, Invalid=578, Unknown=0, NotChecked=0, Total=702 [2020-12-09 20:42:56,503 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2020-12-09 20:42:56,504 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 11. [2020-12-09 20:42:56,504 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2020-12-09 20:42:56,504 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 12 transitions. [2020-12-09 20:42:56,505 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 12 transitions. Word has length 8 [2020-12-09 20:42:56,505 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 20:42:56,505 INFO L481 AbstractCegarLoop]: Abstraction has 11 states and 12 transitions. [2020-12-09 20:42:56,505 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-12-09 20:42:56,505 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 12 transitions. [2020-12-09 20:42:56,505 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-12-09 20:42:56,505 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 20:42:56,505 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1] [2020-12-09 20:42:56,706 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2020-12-09 20:42:56,706 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]=== [2020-12-09 20:42:56,707 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 20:42:56,707 INFO L82 PathProgramCache]: Analyzing trace with hash 1801578643, now seen corresponding path program 2 times [2020-12-09 20:42:56,707 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 20:42:56,707 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [171868119] [2020-12-09 20:42:56,707 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 20:42:56,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 20:42:56,831 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 20:42:56,831 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [171868119] [2020-12-09 20:42:56,832 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [205910728] [2020-12-09 20:42:56,832 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_97282af7-25f2-48d5-aead-ef44704a1e15/bin/utaipan/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 20:42:56,869 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2020-12-09 20:42:56,869 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-09 20:42:56,870 INFO L263 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 30 conjunts are in the unsatisfiable core [2020-12-09 20:42:56,871 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 20:42:57,091 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 20:42:57,091 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 20:42:57,295 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 20:42:57,295 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [326375986] [2020-12-09 20:42:57,296 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2020-12-09 20:42:57,296 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 20:42:57,297 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-09 20:42:57,297 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-09 20:42:57,297 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-09 20:42:57,350 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 20:42:57,514 INFO L180 IcfgInterpreter]: Interpretation finished [2020-12-09 20:42:57,685 WARN L197 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 79 DAG size of output: 44 [2020-12-09 20:42:58,072 WARN L197 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 61 [2020-12-09 20:42:58,170 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-12-09 20:42:58,170 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 20:42:58,170 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7, 7] total 22 [2020-12-09 20:42:58,170 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1420105995] [2020-12-09 20:42:58,170 INFO L461 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-12-09 20:42:58,170 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 20:42:58,171 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-12-09 20:42:58,171 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=722, Unknown=0, NotChecked=0, Total=812 [2020-12-09 20:42:58,171 INFO L87 Difference]: Start difference. First operand 11 states and 12 transitions. Second operand 23 states. [2020-12-09 20:42:58,698 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 20:42:58,698 INFO L93 Difference]: Finished difference Result 23 states and 24 transitions. [2020-12-09 20:42:58,699 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-12-09 20:42:58,699 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 10 [2020-12-09 20:42:58,699 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 20:42:58,699 INFO L225 Difference]: With dead ends: 23 [2020-12-09 20:42:58,699 INFO L226 Difference]: Without dead ends: 18 [2020-12-09 20:42:58,700 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 339 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=274, Invalid=1618, Unknown=0, NotChecked=0, Total=1892 [2020-12-09 20:42:58,700 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-12-09 20:42:58,701 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 17. [2020-12-09 20:42:58,701 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-12-09 20:42:58,702 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2020-12-09 20:42:58,702 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 10 [2020-12-09 20:42:58,702 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 20:42:58,702 INFO L481 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2020-12-09 20:42:58,702 INFO L482 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-12-09 20:42:58,702 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2020-12-09 20:42:58,702 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-12-09 20:42:58,702 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 20:42:58,703 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 2, 2, 1, 1, 1, 1] [2020-12-09 20:42:58,903 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable83,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 20:42:58,904 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]=== [2020-12-09 20:42:58,905 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 20:42:58,906 INFO L82 PathProgramCache]: Analyzing trace with hash -1983467109, now seen corresponding path program 3 times [2020-12-09 20:42:58,906 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 20:42:58,907 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1235415988] [2020-12-09 20:42:58,907 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 20:42:58,925 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 20:42:58,991 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 13 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 20:42:58,991 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1235415988] [2020-12-09 20:42:58,992 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [62132968] [2020-12-09 20:42:58,992 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_97282af7-25f2-48d5-aead-ef44704a1e15/bin/utaipan/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 20:42:59,034 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-09 20:42:59,034 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-09 20:42:59,035 INFO L263 TraceCheckSpWp]: Trace formula consists of 108 conjuncts, 37 conjunts are in the unsatisfiable core [2020-12-09 20:42:59,037 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 20:42:59,315 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 9 proven. 10 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-12-09 20:42:59,315 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 20:42:59,560 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 15 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-12-09 20:42:59,560 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1196481836] [2020-12-09 20:42:59,561 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2020-12-09 20:42:59,561 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 20:42:59,562 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-09 20:42:59,562 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-09 20:42:59,562 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-09 20:42:59,747 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 20:42:59,755 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 20:42:59,832 INFO L180 IcfgInterpreter]: Interpretation finished [2020-12-09 20:43:00,122 WARN L197 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 60 [2020-12-09 20:43:00,369 WARN L197 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 76 DAG size of output: 62 [2020-12-09 20:43:00,461 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-12-09 20:43:00,461 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 20:43:00,461 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 11, 11] total 29 [2020-12-09 20:43:00,461 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1762740435] [2020-12-09 20:43:00,461 INFO L461 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-12-09 20:43:00,461 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 20:43:00,462 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-12-09 20:43:00,462 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=115, Invalid=1075, Unknown=0, NotChecked=0, Total=1190 [2020-12-09 20:43:00,462 INFO L87 Difference]: Start difference. First operand 17 states and 18 transitions. Second operand 30 states. [2020-12-09 20:43:00,859 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 20:43:00,859 INFO L93 Difference]: Finished difference Result 27 states and 28 transitions. [2020-12-09 20:43:00,860 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-12-09 20:43:00,860 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 16 [2020-12-09 20:43:00,860 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 20:43:00,860 INFO L225 Difference]: With dead ends: 27 [2020-12-09 20:43:00,860 INFO L226 Difference]: Without dead ends: 20 [2020-12-09 20:43:00,861 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 387 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=257, Invalid=1723, Unknown=0, NotChecked=0, Total=1980 [2020-12-09 20:43:00,861 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-12-09 20:43:00,862 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 19. [2020-12-09 20:43:00,862 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-12-09 20:43:00,862 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2020-12-09 20:43:00,862 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 16 [2020-12-09 20:43:00,862 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 20:43:00,863 INFO L481 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2020-12-09 20:43:00,863 INFO L482 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-12-09 20:43:00,863 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2020-12-09 20:43:00,863 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-12-09 20:43:00,863 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 20:43:00,863 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 1, 1, 1, 1] [2020-12-09 20:43:01,064 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable127,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 20:43:01,064 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]=== [2020-12-09 20:43:01,065 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 20:43:01,065 INFO L82 PathProgramCache]: Analyzing trace with hash 514729425, now seen corresponding path program 4 times [2020-12-09 20:43:01,065 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 20:43:01,065 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [46797058] [2020-12-09 20:43:01,065 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 20:43:01,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 20:43:01,186 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 4 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 20:43:01,186 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [46797058] [2020-12-09 20:43:01,186 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [712183207] [2020-12-09 20:43:01,186 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_97282af7-25f2-48d5-aead-ef44704a1e15/bin/utaipan/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 20:43:01,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 20:43:01,219 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 40 conjunts are in the unsatisfiable core [2020-12-09 20:43:01,220 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 20:43:01,555 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 4 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 20:43:01,555 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 20:43:01,971 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 9 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 20:43:01,972 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [336971030] [2020-12-09 20:43:01,973 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2020-12-09 20:43:01,973 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 20:43:01,973 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-09 20:43:01,973 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-09 20:43:01,973 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-09 20:43:02,157 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 20:43:02,184 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 20:43:02,279 INFO L180 IcfgInterpreter]: Interpretation finished [2020-12-09 20:43:02,665 WARN L197 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 60 [2020-12-09 20:43:02,934 WARN L197 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 76 DAG size of output: 62 [2020-12-09 20:43:03,033 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-12-09 20:43:03,034 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 20:43:03,034 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11, 11] total 34 [2020-12-09 20:43:03,034 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [863532633] [2020-12-09 20:43:03,034 INFO L461 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-12-09 20:43:03,034 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 20:43:03,035 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-12-09 20:43:03,035 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=1424, Unknown=0, NotChecked=0, Total=1560 [2020-12-09 20:43:03,035 INFO L87 Difference]: Start difference. First operand 19 states and 20 transitions. Second operand 35 states. [2020-12-09 20:43:04,032 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 20:43:04,032 INFO L93 Difference]: Finished difference Result 35 states and 36 transitions. [2020-12-09 20:43:04,032 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-12-09 20:43:04,032 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 18 [2020-12-09 20:43:04,033 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 20:43:04,033 INFO L225 Difference]: With dead ends: 35 [2020-12-09 20:43:04,033 INFO L226 Difference]: Without dead ends: 26 [2020-12-09 20:43:04,034 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 26 SyntacticMatches, 1 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 443 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=478, Invalid=3182, Unknown=0, NotChecked=0, Total=3660 [2020-12-09 20:43:04,034 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-12-09 20:43:04,035 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 25. [2020-12-09 20:43:04,035 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-12-09 20:43:04,036 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 26 transitions. [2020-12-09 20:43:04,036 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 26 transitions. Word has length 18 [2020-12-09 20:43:04,036 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 20:43:04,036 INFO L481 AbstractCegarLoop]: Abstraction has 25 states and 26 transitions. [2020-12-09 20:43:04,036 INFO L482 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-12-09 20:43:04,036 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 26 transitions. [2020-12-09 20:43:04,036 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-12-09 20:43:04,037 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 20:43:04,037 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 4, 4, 1, 1, 1, 1] [2020-12-09 20:43:04,237 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable182 [2020-12-09 20:43:04,238 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]=== [2020-12-09 20:43:04,239 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 20:43:04,239 INFO L82 PathProgramCache]: Analyzing trace with hash -1281095207, now seen corresponding path program 5 times [2020-12-09 20:43:04,239 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 20:43:04,240 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1635913141] [2020-12-09 20:43:04,240 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 20:43:04,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 20:43:04,353 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 31 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 20:43:04,353 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1635913141] [2020-12-09 20:43:04,353 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [160678153] [2020-12-09 20:43:04,353 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_97282af7-25f2-48d5-aead-ef44704a1e15/bin/utaipan/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 20:43:04,401 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2020-12-09 20:43:04,401 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-09 20:43:04,402 INFO L263 TraceCheckSpWp]: Trace formula consists of 150 conjuncts, 36 conjunts are in the unsatisfiable core [2020-12-09 20:43:04,403 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 20:43:04,582 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 36 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 20:43:04,582 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 20:43:04,715 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 36 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 20:43:04,715 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1074899531] [2020-12-09 20:43:04,717 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2020-12-09 20:43:04,717 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 20:43:04,717 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-09 20:43:04,717 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-09 20:43:04,717 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-09 20:43:04,898 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 20:43:04,906 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 20:43:04,986 INFO L180 IcfgInterpreter]: Interpretation finished [2020-12-09 20:43:05,230 WARN L197 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 63 [2020-12-09 20:43:05,450 WARN L197 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 76 DAG size of output: 65 [2020-12-09 20:43:05,533 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-12-09 20:43:05,534 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 20:43:05,534 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13, 13] total 32 [2020-12-09 20:43:05,534 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2132070739] [2020-12-09 20:43:05,534 INFO L461 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-12-09 20:43:05,534 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 20:43:05,535 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-12-09 20:43:05,535 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=208, Invalid=1198, Unknown=0, NotChecked=0, Total=1406 [2020-12-09 20:43:05,536 INFO L87 Difference]: Start difference. First operand 25 states and 26 transitions. Second operand 33 states. [2020-12-09 20:43:05,755 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 20:43:05,756 INFO L93 Difference]: Finished difference Result 40 states and 41 transitions. [2020-12-09 20:43:05,756 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-12-09 20:43:05,756 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 24 [2020-12-09 20:43:05,756 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 20:43:05,756 INFO L225 Difference]: With dead ends: 40 [2020-12-09 20:43:05,757 INFO L226 Difference]: Without dead ends: 28 [2020-12-09 20:43:05,757 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 47 SyntacticMatches, 1 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 624 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=378, Invalid=1692, Unknown=0, NotChecked=0, Total=2070 [2020-12-09 20:43:05,757 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-12-09 20:43:05,759 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 27. [2020-12-09 20:43:05,759 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-12-09 20:43:05,759 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2020-12-09 20:43:05,759 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 24 [2020-12-09 20:43:05,759 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 20:43:05,759 INFO L481 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2020-12-09 20:43:05,759 INFO L482 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-12-09 20:43:05,759 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2020-12-09 20:43:05,760 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-12-09 20:43:05,760 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 20:43:05,760 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 1, 1, 1, 1] [2020-12-09 20:43:05,961 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable237,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 20:43:05,962 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]=== [2020-12-09 20:43:05,963 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 20:43:05,963 INFO L82 PathProgramCache]: Analyzing trace with hash -1169758193, now seen corresponding path program 6 times [2020-12-09 20:43:05,963 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 20:43:05,964 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1413730338] [2020-12-09 20:43:05,964 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 20:43:05,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 20:43:06,130 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 6 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 20:43:06,130 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1413730338] [2020-12-09 20:43:06,131 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [376542733] [2020-12-09 20:43:06,131 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_97282af7-25f2-48d5-aead-ef44704a1e15/bin/utaipan/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 20:43:06,171 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-09 20:43:06,171 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-09 20:43:06,172 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 49 conjunts are in the unsatisfiable core [2020-12-09 20:43:06,174 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 20:43:06,344 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 6 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 20:43:06,344 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 20:43:06,481 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 6 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 20:43:06,482 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [67079412] [2020-12-09 20:43:06,483 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2020-12-09 20:43:06,484 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 20:43:06,484 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-09 20:43:06,484 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-09 20:43:06,484 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-09 20:43:06,551 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 20:43:06,701 INFO L180 IcfgInterpreter]: Interpretation finished [2020-12-09 20:43:06,896 WARN L197 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 79 DAG size of output: 44 [2020-12-09 20:43:07,288 WARN L197 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 61 [2020-12-09 20:43:07,387 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-12-09 20:43:07,387 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 20:43:07,387 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 28 [2020-12-09 20:43:07,388 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1313562478] [2020-12-09 20:43:07,388 INFO L461 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-12-09 20:43:07,388 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 20:43:07,388 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-12-09 20:43:07,389 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=1089, Unknown=0, NotChecked=0, Total=1190 [2020-12-09 20:43:07,389 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand 29 states. [2020-12-09 20:43:07,839 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 20:43:07,840 INFO L93 Difference]: Finished difference Result 43 states and 44 transitions. [2020-12-09 20:43:07,840 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-12-09 20:43:07,840 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 26 [2020-12-09 20:43:07,840 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 20:43:07,840 INFO L225 Difference]: With dead ends: 43 [2020-12-09 20:43:07,840 INFO L226 Difference]: Without dead ends: 30 [2020-12-09 20:43:07,841 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 54 SyntacticMatches, 6 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 373 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=213, Invalid=2043, Unknown=0, NotChecked=0, Total=2256 [2020-12-09 20:43:07,841 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-12-09 20:43:07,842 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2020-12-09 20:43:07,843 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-12-09 20:43:07,843 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 30 transitions. [2020-12-09 20:43:07,843 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 30 transitions. Word has length 26 [2020-12-09 20:43:07,843 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 20:43:07,843 INFO L481 AbstractCegarLoop]: Abstraction has 29 states and 30 transitions. [2020-12-09 20:43:07,843 INFO L482 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-12-09 20:43:07,843 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 30 transitions. [2020-12-09 20:43:07,844 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-12-09 20:43:07,844 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 20:43:07,844 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 1, 1, 1, 1] [2020-12-09 20:43:08,044 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable292,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 20:43:08,046 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]=== [2020-12-09 20:43:08,046 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 20:43:08,047 INFO L82 PathProgramCache]: Analyzing trace with hash -1549070139, now seen corresponding path program 7 times [2020-12-09 20:43:08,047 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 20:43:08,048 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1945635711] [2020-12-09 20:43:08,048 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 20:43:08,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 20:43:08,218 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 16 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 20:43:08,218 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1945635711] [2020-12-09 20:43:08,218 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1628670527] [2020-12-09 20:43:08,218 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_97282af7-25f2-48d5-aead-ef44704a1e15/bin/utaipan/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 20:43:08,255 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 20:43:08,257 INFO L263 TraceCheckSpWp]: Trace formula consists of 170 conjuncts, 47 conjunts are in the unsatisfiable core [2020-12-09 20:43:08,258 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 20:43:08,535 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 25 proven. 47 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 20:43:08,535 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 20:43:08,890 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 36 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 20:43:08,890 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1422635533] [2020-12-09 20:43:08,891 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2020-12-09 20:43:08,891 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 20:43:08,891 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-09 20:43:08,891 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-09 20:43:08,892 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-09 20:43:09,059 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 20:43:09,072 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 20:43:09,144 INFO L180 IcfgInterpreter]: Interpretation finished [2020-12-09 20:43:09,444 WARN L197 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 60 [2020-12-09 20:43:09,704 WARN L197 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 76 DAG size of output: 62 [2020-12-09 20:43:09,809 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-12-09 20:43:09,809 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 20:43:09,809 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 45 [2020-12-09 20:43:09,809 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [929331620] [2020-12-09 20:43:09,809 INFO L461 AbstractCegarLoop]: Interpolant automaton has 47 states [2020-12-09 20:43:09,809 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 20:43:09,810 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2020-12-09 20:43:09,811 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=306, Invalid=2346, Unknown=0, NotChecked=0, Total=2652 [2020-12-09 20:43:09,811 INFO L87 Difference]: Start difference. First operand 29 states and 30 transitions. Second operand 47 states. [2020-12-09 20:43:10,177 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 20:43:10,177 INFO L93 Difference]: Finished difference Result 32 states and 33 transitions. [2020-12-09 20:43:10,178 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-12-09 20:43:10,178 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 28 [2020-12-09 20:43:10,178 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 20:43:10,178 INFO L225 Difference]: With dead ends: 32 [2020-12-09 20:43:10,178 INFO L226 Difference]: Without dead ends: 32 [2020-12-09 20:43:10,179 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1103 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=565, Invalid=3095, Unknown=0, NotChecked=0, Total=3660 [2020-12-09 20:43:10,179 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-12-09 20:43:10,181 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 31. [2020-12-09 20:43:10,181 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-12-09 20:43:10,181 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 32 transitions. [2020-12-09 20:43:10,181 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 32 transitions. Word has length 28 [2020-12-09 20:43:10,181 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 20:43:10,182 INFO L481 AbstractCegarLoop]: Abstraction has 31 states and 32 transitions. [2020-12-09 20:43:10,182 INFO L482 AbstractCegarLoop]: Interpolant automaton has 47 states. [2020-12-09 20:43:10,182 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 32 transitions. [2020-12-09 20:43:10,182 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-12-09 20:43:10,182 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 20:43:10,182 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 1, 1, 1, 1] [2020-12-09 20:43:10,383 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable337 [2020-12-09 20:43:10,383 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]=== [2020-12-09 20:43:10,383 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 20:43:10,383 INFO L82 PathProgramCache]: Analyzing trace with hash 1697248014, now seen corresponding path program 8 times [2020-12-09 20:43:10,383 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 20:43:10,383 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [346709106] [2020-12-09 20:43:10,383 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 20:43:10,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 20:43:10,622 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 7 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 20:43:10,623 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [346709106] [2020-12-09 20:43:10,623 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2031641438] [2020-12-09 20:43:10,623 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_97282af7-25f2-48d5-aead-ef44704a1e15/bin/utaipan/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 20:43:10,689 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2020-12-09 20:43:10,689 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-09 20:43:10,691 INFO L263 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 57 conjunts are in the unsatisfiable core [2020-12-09 20:43:10,692 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 20:43:10,903 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 7 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 20:43:10,903 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 20:43:11,083 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 7 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 20:43:11,083 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [876720962] [2020-12-09 20:43:11,084 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2020-12-09 20:43:11,084 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 20:43:11,084 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-09 20:43:11,085 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-09 20:43:11,085 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-09 20:43:11,132 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 20:43:11,272 INFO L180 IcfgInterpreter]: Interpretation finished [2020-12-09 20:43:11,473 WARN L197 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 79 DAG size of output: 44 [2020-12-09 20:43:11,923 WARN L197 SmtUtils]: Spent 156.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 61 [2020-12-09 20:43:12,029 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-12-09 20:43:12,029 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 20:43:12,029 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 31 [2020-12-09 20:43:12,029 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [865690120] [2020-12-09 20:43:12,030 INFO L461 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-12-09 20:43:12,030 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 20:43:12,030 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-12-09 20:43:12,031 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=1298, Unknown=0, NotChecked=0, Total=1406 [2020-12-09 20:43:12,031 INFO L87 Difference]: Start difference. First operand 31 states and 32 transitions. Second operand 32 states. [2020-12-09 20:43:12,570 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 20:43:12,571 INFO L93 Difference]: Finished difference Result 49 states and 50 transitions. [2020-12-09 20:43:12,571 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-12-09 20:43:12,571 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 30 [2020-12-09 20:43:12,571 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 20:43:12,572 INFO L225 Difference]: With dead ends: 49 [2020-12-09 20:43:12,572 INFO L226 Difference]: Without dead ends: 34 [2020-12-09 20:43:12,573 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 64 SyntacticMatches, 7 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 448 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=235, Invalid=2521, Unknown=0, NotChecked=0, Total=2756 [2020-12-09 20:43:12,573 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-12-09 20:43:12,574 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2020-12-09 20:43:12,574 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-12-09 20:43:12,575 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2020-12-09 20:43:12,575 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 30 [2020-12-09 20:43:12,575 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 20:43:12,575 INFO L481 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2020-12-09 20:43:12,575 INFO L482 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-12-09 20:43:12,575 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2020-12-09 20:43:12,576 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-12-09 20:43:12,576 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 20:43:12,576 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 1, 1, 1, 1] [2020-12-09 20:43:12,777 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable392,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 20:43:12,778 INFO L429 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr6ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr5REQUIRES_VIOLATION, ULTIMATE.startErr4REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION]=== [2020-12-09 20:43:12,779 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 20:43:12,779 INFO L82 PathProgramCache]: Analyzing trace with hash 977195204, now seen corresponding path program 9 times [2020-12-09 20:43:12,780 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 20:43:12,780 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1909072767] [2020-12-09 20:43:12,781 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 20:43:12,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 20:43:13,037 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 25 proven. 73 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 20:43:13,037 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1909072767] [2020-12-09 20:43:13,037 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1558485564] [2020-12-09 20:43:13,037 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_97282af7-25f2-48d5-aead-ef44704a1e15/bin/utaipan/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 20:43:13,101 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-09 20:43:13,101 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-09 20:43:13,103 INFO L263 TraceCheckSpWp]: Trace formula consists of 191 conjuncts, 52 conjunts are in the unsatisfiable core [2020-12-09 20:43:13,104 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 20:43:13,432 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 36 proven. 62 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 20:43:13,432 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 20:43:13,876 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 49 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 20:43:13,876 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [220546704] [2020-12-09 20:43:13,877 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2020-12-09 20:43:13,878 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 20:43:13,878 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-09 20:43:13,878 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-09 20:43:13,878 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-09 20:43:13,924 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 20:43:14,078 INFO L180 IcfgInterpreter]: Interpretation finished [2020-12-09 20:43:14,284 WARN L197 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 79 DAG size of output: 44 [2020-12-09 20:43:14,752 WARN L197 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 61 [2020-12-09 20:43:14,863 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-12-09 20:43:14,864 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 20:43:14,864 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 51 [2020-12-09 20:43:14,864 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [984805550] [2020-12-09 20:43:14,864 INFO L461 AbstractCegarLoop]: Interpolant automaton has 53 states [2020-12-09 20:43:14,864 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 20:43:14,865 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2020-12-09 20:43:14,865 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=385, Invalid=3037, Unknown=0, NotChecked=0, Total=3422 [2020-12-09 20:43:14,866 INFO L87 Difference]: Start difference. First operand 33 states and 34 transitions. Second operand 53 states. [2020-12-09 20:43:15,293 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 20:43:15,293 INFO L93 Difference]: Finished difference Result 36 states and 37 transitions. [2020-12-09 20:43:15,294 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-12-09 20:43:15,294 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 32 [2020-12-09 20:43:15,294 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 20:43:15,294 INFO L225 Difference]: With dead ends: 36 [2020-12-09 20:43:15,294 INFO L226 Difference]: Without dead ends: 36 [2020-12-09 20:43:15,295 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 54 SyntacticMatches, 0 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1491 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=708, Invalid=3984, Unknown=0, NotChecked=0, Total=4692 [2020-12-09 20:43:15,296 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-12-09 20:43:15,297 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2020-12-09 20:43:15,297 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-12-09 20:43:15,297 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 36 transitions. [2020-12-09 20:43:15,297 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 36 transitions. Word has length 32 [2020-12-09 20:43:15,297 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 20:43:15,298 INFO L481 AbstractCegarLoop]: Abstraction has 35 states and 36 transitions. [2020-12-09 20:43:15,298 INFO L482 AbstractCegarLoop]: Interpolant automaton has 53 states. [2020-12-09 20:43:15,298 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 36 transitions. [2020-12-09 20:43:15,298 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-12-09 20:43:15,298 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 20:43:15,298 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 1, 1, 1, 1] [2020-12-09 20:43:15,499 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable437 [2020-12-09 20:43:15,500 INFO L429 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr6ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr5REQUIRES_VIOLATION, ULTIMATE.startErr4REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION]=== [2020-12-09 20:43:15,500 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 20:43:15,501 INFO L82 PathProgramCache]: Analyzing trace with hash -1513246899, now seen corresponding path program 10 times [2020-12-09 20:43:15,501 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 20:43:15,502 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [797543117] [2020-12-09 20:43:15,502 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 20:43:15,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 20:43:15,761 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 8 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 20:43:15,761 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [797543117] [2020-12-09 20:43:15,761 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [956908307] [2020-12-09 20:43:15,761 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_97282af7-25f2-48d5-aead-ef44704a1e15/bin/utaipan/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 20:43:15,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 20:43:15,804 INFO L263 TraceCheckSpWp]: Trace formula consists of 202 conjuncts, 63 conjunts are in the unsatisfiable core [2020-12-09 20:43:15,805 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 20:43:16,072 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 8 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 20:43:16,072 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 20:43:16,285 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 8 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 20:43:16,285 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1691212180] [2020-12-09 20:43:16,286 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2020-12-09 20:43:16,286 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 20:43:16,286 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-09 20:43:16,287 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-09 20:43:16,287 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-09 20:43:16,334 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 20:43:16,473 INFO L180 IcfgInterpreter]: Interpretation finished [2020-12-09 20:43:16,674 WARN L197 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 79 DAG size of output: 44 [2020-12-09 20:43:17,151 WARN L197 SmtUtils]: Spent 154.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 61 [2020-12-09 20:43:17,266 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-12-09 20:43:17,266 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 20:43:17,266 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 34 [2020-12-09 20:43:17,266 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [853499505] [2020-12-09 20:43:17,267 INFO L461 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-12-09 20:43:17,267 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 20:43:17,267 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-12-09 20:43:17,267 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=115, Invalid=1525, Unknown=0, NotChecked=0, Total=1640 [2020-12-09 20:43:17,268 INFO L87 Difference]: Start difference. First operand 35 states and 36 transitions. Second operand 35 states. [2020-12-09 20:43:17,905 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 20:43:17,905 INFO L93 Difference]: Finished difference Result 55 states and 56 transitions. [2020-12-09 20:43:17,906 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-12-09 20:43:17,906 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 34 [2020-12-09 20:43:17,906 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 20:43:17,906 INFO L225 Difference]: With dead ends: 55 [2020-12-09 20:43:17,906 INFO L226 Difference]: Without dead ends: 38 [2020-12-09 20:43:17,907 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 74 SyntacticMatches, 8 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 530 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=257, Invalid=3049, Unknown=0, NotChecked=0, Total=3306 [2020-12-09 20:43:17,908 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-12-09 20:43:17,909 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2020-12-09 20:43:17,909 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-12-09 20:43:17,909 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 38 transitions. [2020-12-09 20:43:17,909 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 38 transitions. Word has length 34 [2020-12-09 20:43:17,910 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 20:43:17,910 INFO L481 AbstractCegarLoop]: Abstraction has 37 states and 38 transitions. [2020-12-09 20:43:17,910 INFO L482 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-12-09 20:43:17,910 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 38 transitions. [2020-12-09 20:43:17,910 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-12-09 20:43:17,910 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 20:43:17,910 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 1, 1, 1, 1] [2020-12-09 20:43:18,111 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable482,12 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 20:43:18,111 INFO L429 AbstractCegarLoop]: === Iteration 19 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr6ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr5REQUIRES_VIOLATION, ULTIMATE.startErr4REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION]=== [2020-12-09 20:43:18,112 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 20:43:18,112 INFO L82 PathProgramCache]: Analyzing trace with hash 87081475, now seen corresponding path program 11 times [2020-12-09 20:43:18,113 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 20:43:18,113 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [838754423] [2020-12-09 20:43:18,114 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 20:43:18,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 20:43:18,365 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 36 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 20:43:18,366 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [838754423] [2020-12-09 20:43:18,366 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1019344164] [2020-12-09 20:43:18,366 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_97282af7-25f2-48d5-aead-ef44704a1e15/bin/utaipan/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 20:43:18,440 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2020-12-09 20:43:18,440 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-09 20:43:18,442 INFO L263 TraceCheckSpWp]: Trace formula consists of 212 conjuncts, 61 conjunts are in the unsatisfiable core [2020-12-09 20:43:18,443 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 20:43:18,684 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 49 proven. 79 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 20:43:18,684 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 20:43:19,239 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 64 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 20:43:19,239 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [187252679] [2020-12-09 20:43:19,240 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2020-12-09 20:43:19,240 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 20:43:19,241 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-09 20:43:19,241 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-09 20:43:19,241 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-09 20:43:19,407 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 20:43:19,422 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 20:43:19,492 INFO L180 IcfgInterpreter]: Interpretation finished [2020-12-09 20:43:19,823 WARN L197 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 60 [2020-12-09 20:43:20,148 WARN L197 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 76 DAG size of output: 62 [2020-12-09 20:43:20,264 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-12-09 20:43:20,264 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 20:43:20,264 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18, 18] total 48 [2020-12-09 20:43:20,265 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1247369383] [2020-12-09 20:43:20,265 INFO L461 AbstractCegarLoop]: Interpolant automaton has 50 states [2020-12-09 20:43:20,265 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 20:43:20,265 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2020-12-09 20:43:20,266 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=340, Invalid=2630, Unknown=0, NotChecked=0, Total=2970 [2020-12-09 20:43:20,266 INFO L87 Difference]: Start difference. First operand 37 states and 38 transitions. Second operand 50 states. [2020-12-09 20:43:20,800 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 20:43:20,800 INFO L93 Difference]: Finished difference Result 40 states and 41 transitions. [2020-12-09 20:43:20,801 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-12-09 20:43:20,801 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 36 [2020-12-09 20:43:20,801 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 20:43:20,801 INFO L225 Difference]: With dead ends: 40 [2020-12-09 20:43:20,801 INFO L226 Difference]: Without dead ends: 40 [2020-12-09 20:43:20,802 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 72 SyntacticMatches, 0 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1081 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=655, Invalid=3635, Unknown=0, NotChecked=0, Total=4290 [2020-12-09 20:43:20,802 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-12-09 20:43:20,804 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 39. [2020-12-09 20:43:20,804 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-12-09 20:43:20,804 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2020-12-09 20:43:20,804 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 36 [2020-12-09 20:43:20,804 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 20:43:20,804 INFO L481 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2020-12-09 20:43:20,805 INFO L482 AbstractCegarLoop]: Interpolant automaton has 50 states. [2020-12-09 20:43:20,805 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2020-12-09 20:43:20,805 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-12-09 20:43:20,805 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 20:43:20,805 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 8, 8, 1, 1, 1, 1] [2020-12-09 20:43:21,006 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable527,13 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 20:43:21,006 INFO L429 AbstractCegarLoop]: === Iteration 20 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr6ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr5REQUIRES_VIOLATION, ULTIMATE.startErr4REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION]=== [2020-12-09 20:43:21,007 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 20:43:21,007 INFO L82 PathProgramCache]: Analyzing trace with hash 2080918732, now seen corresponding path program 12 times [2020-12-09 20:43:21,008 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 20:43:21,008 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2117015382] [2020-12-09 20:43:21,008 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 20:43:21,034 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 20:43:21,344 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 9 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 20:43:21,344 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2117015382] [2020-12-09 20:43:21,344 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [339912686] [2020-12-09 20:43:21,344 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_97282af7-25f2-48d5-aead-ef44704a1e15/bin/utaipan/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 20:43:21,413 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-09 20:43:21,413 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-09 20:43:21,415 INFO L263 TraceCheckSpWp]: Trace formula consists of 223 conjuncts, 53 conjunts are in the unsatisfiable core [2020-12-09 20:43:21,417 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 20:43:22,242 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 73 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 20:43:22,242 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 20:43:23,277 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 65 proven. 80 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 20:43:23,277 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1967712876] [2020-12-09 20:43:23,278 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2020-12-09 20:43:23,278 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 20:43:23,278 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-09 20:43:23,278 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-09 20:43:23,278 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-09 20:43:23,442 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 20:43:23,471 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 20:43:23,546 INFO L180 IcfgInterpreter]: Interpretation finished [2020-12-09 20:43:23,875 WARN L197 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 60 [2020-12-09 20:43:24,237 WARN L197 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 76 DAG size of output: 62 [2020-12-09 20:43:24,362 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-12-09 20:43:24,362 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 20:43:24,362 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21, 21] total 60 [2020-12-09 20:43:24,362 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [477511421] [2020-12-09 20:43:24,363 INFO L461 AbstractCegarLoop]: Interpolant automaton has 61 states [2020-12-09 20:43:24,363 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 20:43:24,363 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2020-12-09 20:43:24,364 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=388, Invalid=3902, Unknown=0, NotChecked=0, Total=4290 [2020-12-09 20:43:24,364 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand 61 states. [2020-12-09 20:43:25,691 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 20:43:25,691 INFO L93 Difference]: Finished difference Result 61 states and 62 transitions. [2020-12-09 20:43:25,692 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-12-09 20:43:25,692 INFO L78 Accepts]: Start accepts. Automaton has 61 states. Word has length 38 [2020-12-09 20:43:25,692 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 20:43:25,692 INFO L225 Difference]: With dead ends: 61 [2020-12-09 20:43:25,692 INFO L226 Difference]: Without dead ends: 42 [2020-12-09 20:43:25,694 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 156 GetRequests, 70 SyntacticMatches, 1 SemanticMatches, 85 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1168 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=833, Invalid=6649, Unknown=0, NotChecked=0, Total=7482 [2020-12-09 20:43:25,694 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-12-09 20:43:25,696 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2020-12-09 20:43:25,696 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-12-09 20:43:25,696 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 42 transitions. [2020-12-09 20:43:25,696 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 42 transitions. Word has length 38 [2020-12-09 20:43:25,696 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 20:43:25,696 INFO L481 AbstractCegarLoop]: Abstraction has 41 states and 42 transitions. [2020-12-09 20:43:25,696 INFO L482 AbstractCegarLoop]: Interpolant automaton has 61 states. [2020-12-09 20:43:25,696 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 42 transitions. [2020-12-09 20:43:25,697 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-12-09 20:43:25,697 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 20:43:25,697 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 1, 1, 1, 1] [2020-12-09 20:43:25,897 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable582 [2020-12-09 20:43:25,898 INFO L429 AbstractCegarLoop]: === Iteration 21 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr6ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr5REQUIRES_VIOLATION, ULTIMATE.startErr4REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION]=== [2020-12-09 20:43:25,899 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 20:43:25,899 INFO L82 PathProgramCache]: Analyzing trace with hash 2039944322, now seen corresponding path program 13 times [2020-12-09 20:43:25,899 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 20:43:25,900 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1139497725] [2020-12-09 20:43:25,900 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 20:43:25,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 20:43:26,191 INFO L134 CoverageAnalysis]: Checked inductivity of 162 backedges. 49 proven. 113 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 20:43:26,191 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1139497725] [2020-12-09 20:43:26,191 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [613500504] [2020-12-09 20:43:26,191 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_97282af7-25f2-48d5-aead-ef44704a1e15/bin/utaipan/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 20:43:26,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 20:43:26,233 INFO L263 TraceCheckSpWp]: Trace formula consists of 233 conjuncts, 62 conjunts are in the unsatisfiable core [2020-12-09 20:43:26,235 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 20:43:26,756 INFO L134 CoverageAnalysis]: Checked inductivity of 162 backedges. 64 proven. 98 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 20:43:26,756 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 20:43:27,477 INFO L134 CoverageAnalysis]: Checked inductivity of 162 backedges. 81 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 20:43:27,477 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1046760772] [2020-12-09 20:43:27,478 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2020-12-09 20:43:27,478 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 20:43:27,478 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-09 20:43:27,478 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-09 20:43:27,478 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-09 20:43:27,529 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 20:43:27,670 INFO L180 IcfgInterpreter]: Interpretation finished [2020-12-09 20:43:27,911 WARN L197 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 79 DAG size of output: 44 [2020-12-09 20:43:28,394 WARN L197 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 61 [2020-12-09 20:43:28,514 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-12-09 20:43:28,514 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 20:43:28,514 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 63 [2020-12-09 20:43:28,514 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1908124442] [2020-12-09 20:43:28,514 INFO L461 AbstractCegarLoop]: Interpolant automaton has 65 states [2020-12-09 20:43:28,515 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 20:43:28,515 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2020-12-09 20:43:28,515 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=551, Invalid=4419, Unknown=0, NotChecked=0, Total=4970 [2020-12-09 20:43:28,515 INFO L87 Difference]: Start difference. First operand 41 states and 42 transitions. Second operand 65 states. [2020-12-09 20:43:29,133 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 20:43:29,133 INFO L93 Difference]: Finished difference Result 44 states and 45 transitions. [2020-12-09 20:43:29,133 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-12-09 20:43:29,134 INFO L78 Accepts]: Start accepts. Automaton has 65 states. Word has length 40 [2020-12-09 20:43:29,134 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 20:43:29,134 INFO L225 Difference]: With dead ends: 44 [2020-12-09 20:43:29,134 INFO L226 Difference]: Without dead ends: 44 [2020-12-09 20:43:29,135 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 70 SyntacticMatches, 0 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2236 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=1023, Invalid=5783, Unknown=0, NotChecked=0, Total=6806 [2020-12-09 20:43:29,135 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-12-09 20:43:29,136 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 43. [2020-12-09 20:43:29,136 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-12-09 20:43:29,137 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 44 transitions. [2020-12-09 20:43:29,137 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 44 transitions. Word has length 40 [2020-12-09 20:43:29,137 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 20:43:29,137 INFO L481 AbstractCegarLoop]: Abstraction has 43 states and 44 transitions. [2020-12-09 20:43:29,137 INFO L482 AbstractCegarLoop]: Interpolant automaton has 65 states. [2020-12-09 20:43:29,140 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 44 transitions. [2020-12-09 20:43:29,140 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-12-09 20:43:29,140 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 20:43:29,140 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 1, 1, 1, 1] [2020-12-09 20:43:29,341 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable637,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 20:43:29,342 INFO L429 AbstractCegarLoop]: === Iteration 22 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr6ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr5REQUIRES_VIOLATION, ULTIMATE.startErr4REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION]=== [2020-12-09 20:43:29,342 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 20:43:29,343 INFO L82 PathProgramCache]: Analyzing trace with hash 1881406347, now seen corresponding path program 14 times [2020-12-09 20:43:29,343 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 20:43:29,344 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [766438394] [2020-12-09 20:43:29,344 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 20:43:29,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 20:43:29,717 INFO L134 CoverageAnalysis]: Checked inductivity of 181 backedges. 10 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 20:43:29,718 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [766438394] [2020-12-09 20:43:29,718 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1640275321] [2020-12-09 20:43:29,718 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_97282af7-25f2-48d5-aead-ef44704a1e15/bin/utaipan/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 20:43:29,831 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2020-12-09 20:43:29,831 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-09 20:43:29,834 INFO L263 TraceCheckSpWp]: Trace formula consists of 244 conjuncts, 75 conjunts are in the unsatisfiable core [2020-12-09 20:43:29,835 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 20:43:30,200 INFO L134 CoverageAnalysis]: Checked inductivity of 181 backedges. 10 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 20:43:30,200 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 20:43:30,503 INFO L134 CoverageAnalysis]: Checked inductivity of 181 backedges. 10 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 20:43:30,503 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [363835028] [2020-12-09 20:43:30,504 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2020-12-09 20:43:30,504 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 20:43:30,504 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-09 20:43:30,504 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-09 20:43:30,504 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-09 20:43:30,555 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 20:43:30,699 INFO L180 IcfgInterpreter]: Interpretation finished [2020-12-09 20:43:30,938 WARN L197 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 79 DAG size of output: 44 [2020-12-09 20:43:31,428 WARN L197 SmtUtils]: Spent 154.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 61 [2020-12-09 20:43:31,538 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-12-09 20:43:31,538 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 20:43:31,538 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 40 [2020-12-09 20:43:31,538 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [486530786] [2020-12-09 20:43:31,538 INFO L461 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-12-09 20:43:31,538 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 20:43:31,539 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-12-09 20:43:31,539 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=2033, Unknown=0, NotChecked=0, Total=2162 [2020-12-09 20:43:31,539 INFO L87 Difference]: Start difference. First operand 43 states and 44 transitions. Second operand 41 states. [2020-12-09 20:43:32,665 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 20:43:32,666 INFO L93 Difference]: Finished difference Result 67 states and 68 transitions. [2020-12-09 20:43:32,666 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-12-09 20:43:32,666 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 42 [2020-12-09 20:43:32,666 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 20:43:32,666 INFO L225 Difference]: With dead ends: 67 [2020-12-09 20:43:32,667 INFO L226 Difference]: Without dead ends: 46 [2020-12-09 20:43:32,667 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 170 GetRequests, 94 SyntacticMatches, 10 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 715 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=301, Invalid=4255, Unknown=0, NotChecked=0, Total=4556 [2020-12-09 20:43:32,667 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-12-09 20:43:32,669 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 45. [2020-12-09 20:43:32,669 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-12-09 20:43:32,669 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 46 transitions. [2020-12-09 20:43:32,669 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 46 transitions. Word has length 42 [2020-12-09 20:43:32,670 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 20:43:32,670 INFO L481 AbstractCegarLoop]: Abstraction has 45 states and 46 transitions. [2020-12-09 20:43:32,670 INFO L482 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-12-09 20:43:32,670 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 46 transitions. [2020-12-09 20:43:32,670 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-12-09 20:43:32,670 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 20:43:32,670 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 1, 1, 1, 1] [2020-12-09 20:43:32,871 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable682,16 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 20:43:32,872 INFO L429 AbstractCegarLoop]: === Iteration 23 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr6ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr5REQUIRES_VIOLATION, ULTIMATE.startErr4REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION]=== [2020-12-09 20:43:32,872 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 20:43:32,873 INFO L82 PathProgramCache]: Analyzing trace with hash -184813503, now seen corresponding path program 15 times [2020-12-09 20:43:32,873 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 20:43:32,874 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1629489208] [2020-12-09 20:43:32,874 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 20:43:32,907 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 20:43:33,217 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 64 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 20:43:33,217 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1629489208] [2020-12-09 20:43:33,217 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1872115577] [2020-12-09 20:43:33,217 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_97282af7-25f2-48d5-aead-ef44704a1e15/bin/utaipan/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 20:43:33,320 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-09 20:43:33,320 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-09 20:43:33,322 INFO L263 TraceCheckSpWp]: Trace formula consists of 254 conjuncts, 67 conjunts are in the unsatisfiable core [2020-12-09 20:43:33,323 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 20:43:33,945 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 81 proven. 119 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 20:43:33,945 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 20:43:34,758 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 100 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 20:43:34,759 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1327398710] [2020-12-09 20:43:34,760 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2020-12-09 20:43:34,760 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 20:43:34,760 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-09 20:43:34,760 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-09 20:43:34,760 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-09 20:43:34,815 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 20:43:34,962 INFO L180 IcfgInterpreter]: Interpretation finished [2020-12-09 20:43:35,219 WARN L197 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 79 DAG size of output: 44 [2020-12-09 20:43:35,767 WARN L197 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 61 [2020-12-09 20:43:35,895 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-12-09 20:43:35,895 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 20:43:35,896 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 69 [2020-12-09 20:43:35,896 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1355393401] [2020-12-09 20:43:35,896 INFO L461 AbstractCegarLoop]: Interpolant automaton has 71 states [2020-12-09 20:43:35,896 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 20:43:35,896 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2020-12-09 20:43:35,897 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=646, Invalid=5206, Unknown=0, NotChecked=0, Total=5852 [2020-12-09 20:43:35,897 INFO L87 Difference]: Start difference. First operand 45 states and 46 transitions. Second operand 71 states. [2020-12-09 20:43:36,642 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 20:43:36,642 INFO L93 Difference]: Finished difference Result 48 states and 49 transitions. [2020-12-09 20:43:36,643 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-12-09 20:43:36,643 INFO L78 Accepts]: Start accepts. Automaton has 71 states. Word has length 44 [2020-12-09 20:43:36,643 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 20:43:36,643 INFO L225 Difference]: With dead ends: 48 [2020-12-09 20:43:36,643 INFO L226 Difference]: Without dead ends: 48 [2020-12-09 20:43:36,644 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 166 GetRequests, 78 SyntacticMatches, 0 SemanticMatches, 88 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2664 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=1203, Invalid=6807, Unknown=0, NotChecked=0, Total=8010 [2020-12-09 20:43:36,644 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-12-09 20:43:36,645 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 47. [2020-12-09 20:43:36,645 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-12-09 20:43:36,645 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 48 transitions. [2020-12-09 20:43:36,646 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 48 transitions. Word has length 44 [2020-12-09 20:43:36,646 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 20:43:36,646 INFO L481 AbstractCegarLoop]: Abstraction has 47 states and 48 transitions. [2020-12-09 20:43:36,646 INFO L482 AbstractCegarLoop]: Interpolant automaton has 71 states. [2020-12-09 20:43:36,646 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 48 transitions. [2020-12-09 20:43:36,646 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-12-09 20:43:36,646 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 20:43:36,646 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 1, 1, 1, 1] [2020-12-09 20:43:36,847 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable727,17 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 20:43:36,848 INFO L429 AbstractCegarLoop]: === Iteration 24 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr6ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr5REQUIRES_VIOLATION, ULTIMATE.startErr4REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION]=== [2020-12-09 20:43:36,848 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 20:43:36,849 INFO L82 PathProgramCache]: Analyzing trace with hash -1512117366, now seen corresponding path program 16 times [2020-12-09 20:43:36,849 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 20:43:36,849 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1400759232] [2020-12-09 20:43:36,850 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 20:43:36,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 20:43:37,298 INFO L134 CoverageAnalysis]: Checked inductivity of 221 backedges. 11 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 20:43:37,299 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1400759232] [2020-12-09 20:43:37,299 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [755764961] [2020-12-09 20:43:37,299 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_97282af7-25f2-48d5-aead-ef44704a1e15/bin/utaipan/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 20:43:37,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 20:43:37,353 INFO L263 TraceCheckSpWp]: Trace formula consists of 265 conjuncts, 81 conjunts are in the unsatisfiable core [2020-12-09 20:43:37,354 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 20:43:37,787 INFO L134 CoverageAnalysis]: Checked inductivity of 221 backedges. 11 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 20:43:37,787 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 20:43:38,141 INFO L134 CoverageAnalysis]: Checked inductivity of 221 backedges. 11 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 20:43:38,141 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1592891545] [2020-12-09 20:43:38,142 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2020-12-09 20:43:38,142 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 20:43:38,142 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-09 20:43:38,142 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-09 20:43:38,142 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-09 20:43:38,286 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 20:43:38,317 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 20:43:38,395 INFO L180 IcfgInterpreter]: Interpretation finished [2020-12-09 20:43:38,747 WARN L197 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 60 [2020-12-09 20:43:39,100 WARN L197 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 76 DAG size of output: 62 [2020-12-09 20:43:39,219 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-12-09 20:43:39,219 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 20:43:39,219 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 43 [2020-12-09 20:43:39,219 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1252951116] [2020-12-09 20:43:39,220 INFO L461 AbstractCegarLoop]: Interpolant automaton has 44 states [2020-12-09 20:43:39,220 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 20:43:39,220 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2020-12-09 20:43:39,220 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=128, Invalid=2224, Unknown=0, NotChecked=0, Total=2352 [2020-12-09 20:43:39,220 INFO L87 Difference]: Start difference. First operand 47 states and 48 transitions. Second operand 44 states. [2020-12-09 20:43:40,516 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 20:43:40,516 INFO L93 Difference]: Finished difference Result 73 states and 74 transitions. [2020-12-09 20:43:40,517 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-12-09 20:43:40,517 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 46 [2020-12-09 20:43:40,517 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 20:43:40,517 INFO L225 Difference]: With dead ends: 73 [2020-12-09 20:43:40,517 INFO L226 Difference]: Without dead ends: 50 [2020-12-09 20:43:40,518 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 186 GetRequests, 105 SyntacticMatches, 11 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 728 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=315, Invalid=4797, Unknown=0, NotChecked=0, Total=5112 [2020-12-09 20:43:40,518 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-12-09 20:43:40,519 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 49. [2020-12-09 20:43:40,519 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-12-09 20:43:40,519 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 50 transitions. [2020-12-09 20:43:40,519 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 50 transitions. Word has length 46 [2020-12-09 20:43:40,520 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 20:43:40,520 INFO L481 AbstractCegarLoop]: Abstraction has 49 states and 50 transitions. [2020-12-09 20:43:40,520 INFO L482 AbstractCegarLoop]: Interpolant automaton has 44 states. [2020-12-09 20:43:40,520 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 50 transitions. [2020-12-09 20:43:40,520 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-12-09 20:43:40,520 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 20:43:40,520 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 1, 1, 1, 1] [2020-12-09 20:43:40,721 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable772 [2020-12-09 20:43:40,722 INFO L429 AbstractCegarLoop]: === Iteration 25 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr6ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr5REQUIRES_VIOLATION, ULTIMATE.startErr4REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION]=== [2020-12-09 20:43:40,722 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 20:43:40,723 INFO L82 PathProgramCache]: Analyzing trace with hash -799171264, now seen corresponding path program 17 times [2020-12-09 20:43:40,723 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 20:43:40,724 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1822713994] [2020-12-09 20:43:40,724 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 20:43:40,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 20:43:41,143 INFO L134 CoverageAnalysis]: Checked inductivity of 242 backedges. 81 proven. 161 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 20:43:41,143 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1822713994] [2020-12-09 20:43:41,143 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1123207749] [2020-12-09 20:43:41,143 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_97282af7-25f2-48d5-aead-ef44704a1e15/bin/utaipan/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 20:43:41,267 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2020-12-09 20:43:41,267 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-09 20:43:41,269 INFO L263 TraceCheckSpWp]: Trace formula consists of 275 conjuncts, 76 conjunts are in the unsatisfiable core [2020-12-09 20:43:41,270 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 20:43:41,675 INFO L134 CoverageAnalysis]: Checked inductivity of 242 backedges. 100 proven. 142 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 20:43:41,676 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 20:43:42,652 INFO L134 CoverageAnalysis]: Checked inductivity of 242 backedges. 121 proven. 121 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 20:43:42,653 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [889688430] [2020-12-09 20:43:42,654 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2020-12-09 20:43:42,654 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 20:43:42,654 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-09 20:43:42,654 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-09 20:43:42,654 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-09 20:43:42,719 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 20:43:42,860 INFO L180 IcfgInterpreter]: Interpretation finished [2020-12-09 20:43:43,147 WARN L197 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 79 DAG size of output: 44 [2020-12-09 20:43:43,743 WARN L197 SmtUtils]: Spent 168.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 61 [2020-12-09 20:43:43,880 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-12-09 20:43:43,880 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 20:43:43,880 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 24, 24] total 63 [2020-12-09 20:43:43,880 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1873988904] [2020-12-09 20:43:43,880 INFO L461 AbstractCegarLoop]: Interpolant automaton has 65 states [2020-12-09 20:43:43,881 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 20:43:43,881 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2020-12-09 20:43:43,881 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=543, Invalid=4427, Unknown=0, NotChecked=0, Total=4970 [2020-12-09 20:43:43,881 INFO L87 Difference]: Start difference. First operand 49 states and 50 transitions. Second operand 65 states. [2020-12-09 20:43:44,806 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 20:43:44,806 INFO L93 Difference]: Finished difference Result 52 states and 53 transitions. [2020-12-09 20:43:44,807 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-12-09 20:43:44,807 INFO L78 Accepts]: Start accepts. Automaton has 65 states. Word has length 48 [2020-12-09 20:43:44,807 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 20:43:44,807 INFO L225 Difference]: With dead ends: 52 [2020-12-09 20:43:44,807 INFO L226 Difference]: Without dead ends: 52 [2020-12-09 20:43:44,808 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 181 GetRequests, 98 SyntacticMatches, 0 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1916 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=1050, Invalid=6090, Unknown=0, NotChecked=0, Total=7140 [2020-12-09 20:43:44,808 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-12-09 20:43:44,809 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 51. [2020-12-09 20:43:44,809 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-12-09 20:43:44,810 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 52 transitions. [2020-12-09 20:43:44,810 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 52 transitions. Word has length 48 [2020-12-09 20:43:44,810 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 20:43:44,810 INFO L481 AbstractCegarLoop]: Abstraction has 51 states and 52 transitions. [2020-12-09 20:43:44,810 INFO L482 AbstractCegarLoop]: Interpolant automaton has 65 states. [2020-12-09 20:43:44,810 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 52 transitions. [2020-12-09 20:43:44,810 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-12-09 20:43:44,810 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 20:43:44,810 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 11, 11, 1, 1, 1, 1] [2020-12-09 20:43:45,011 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable827,19 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 20:43:45,012 INFO L429 AbstractCegarLoop]: === Iteration 26 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr6ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr5REQUIRES_VIOLATION, ULTIMATE.startErr4REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION]=== [2020-12-09 20:43:45,012 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 20:43:45,013 INFO L82 PathProgramCache]: Analyzing trace with hash 795561161, now seen corresponding path program 18 times [2020-12-09 20:43:45,013 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 20:43:45,013 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [692110837] [2020-12-09 20:43:45,014 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 20:43:45,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 20:43:45,538 INFO L134 CoverageAnalysis]: Checked inductivity of 265 backedges. 12 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 20:43:45,538 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [692110837] [2020-12-09 20:43:45,539 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [129879218] [2020-12-09 20:43:45,539 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_97282af7-25f2-48d5-aead-ef44704a1e15/bin/utaipan/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 20:43:45,704 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-09 20:43:45,704 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-09 20:43:45,707 INFO L263 TraceCheckSpWp]: Trace formula consists of 286 conjuncts, 109 conjunts are in the unsatisfiable core [2020-12-09 20:43:45,708 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 20:43:49,026 INFO L134 CoverageAnalysis]: Checked inductivity of 265 backedges. 12 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 20:43:49,026 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 20:43:53,714 INFO L134 CoverageAnalysis]: Checked inductivity of 265 backedges. 144 proven. 121 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 20:43:53,714 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [620394386] [2020-12-09 20:43:53,715 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2020-12-09 20:43:53,715 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 20:43:53,715 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-09 20:43:53,715 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-09 20:43:53,715 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-09 20:43:53,782 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 20:43:53,929 INFO L180 IcfgInterpreter]: Interpretation finished [2020-12-09 20:43:54,324 WARN L197 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 79 DAG size of output: 44 [2020-12-09 20:43:55,179 WARN L197 SmtUtils]: Spent 156.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 61 [2020-12-09 20:43:55,389 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-12-09 20:43:55,389 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 20:43:55,390 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 38, 38] total 99 [2020-12-09 20:43:55,390 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1454182508] [2020-12-09 20:43:55,390 INFO L461 AbstractCegarLoop]: Interpolant automaton has 100 states [2020-12-09 20:43:55,390 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 20:43:55,390 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 100 interpolants. [2020-12-09 20:43:55,391 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1077, Invalid=10053, Unknown=0, NotChecked=0, Total=11130 [2020-12-09 20:43:55,391 INFO L87 Difference]: Start difference. First operand 51 states and 52 transitions. Second operand 100 states. [2020-12-09 20:44:00,190 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 20:44:00,190 INFO L93 Difference]: Finished difference Result 79 states and 80 transitions. [2020-12-09 20:44:00,191 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-12-09 20:44:00,191 INFO L78 Accepts]: Start accepts. Automaton has 100 states. Word has length 50 [2020-12-09 20:44:00,191 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 20:44:00,191 INFO L225 Difference]: With dead ends: 79 [2020-12-09 20:44:00,191 INFO L226 Difference]: Without dead ends: 54 [2020-12-09 20:44:00,192 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 203 GetRequests, 72 SyntacticMatches, 1 SemanticMatches, 130 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3307 ImplicationChecksByTransitivity, 11.9s TimeCoverageRelationStatistics Valid=1679, Invalid=15613, Unknown=0, NotChecked=0, Total=17292 [2020-12-09 20:44:00,192 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-12-09 20:44:00,193 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2020-12-09 20:44:00,193 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-12-09 20:44:00,193 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 54 transitions. [2020-12-09 20:44:00,193 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 54 transitions. Word has length 50 [2020-12-09 20:44:00,193 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 20:44:00,194 INFO L481 AbstractCegarLoop]: Abstraction has 53 states and 54 transitions. [2020-12-09 20:44:00,194 INFO L482 AbstractCegarLoop]: Interpolant automaton has 100 states. [2020-12-09 20:44:00,194 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 54 transitions. [2020-12-09 20:44:00,194 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-12-09 20:44:00,194 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 20:44:00,194 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 12, 12, 1, 1, 1, 1] [2020-12-09 20:44:00,395 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable872 [2020-12-09 20:44:00,395 INFO L429 AbstractCegarLoop]: === Iteration 27 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr6ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr5REQUIRES_VIOLATION, ULTIMATE.startErr4REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION]=== [2020-12-09 20:44:00,396 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 20:44:00,396 INFO L82 PathProgramCache]: Analyzing trace with hash -1288817793, now seen corresponding path program 19 times [2020-12-09 20:44:00,397 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 20:44:00,397 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2039696325] [2020-12-09 20:44:00,397 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 20:44:00,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 20:44:00,846 INFO L134 CoverageAnalysis]: Checked inductivity of 288 backedges. 100 proven. 188 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 20:44:00,846 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2039696325] [2020-12-09 20:44:00,847 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1614617987] [2020-12-09 20:44:00,847 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_97282af7-25f2-48d5-aead-ef44704a1e15/bin/utaipan/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 20:44:00,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 20:44:00,897 INFO L263 TraceCheckSpWp]: Trace formula consists of 296 conjuncts, 77 conjunts are in the unsatisfiable core [2020-12-09 20:44:00,898 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 20:44:01,787 INFO L134 CoverageAnalysis]: Checked inductivity of 288 backedges. 121 proven. 167 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 20:44:01,787 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 20:44:02,953 INFO L134 CoverageAnalysis]: Checked inductivity of 288 backedges. 144 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 20:44:02,953 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [949907735] [2020-12-09 20:44:02,954 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2020-12-09 20:44:02,954 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 20:44:02,954 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-09 20:44:02,955 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-09 20:44:02,955 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-09 20:44:03,124 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 20:44:03,158 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 20:44:03,235 INFO L180 IcfgInterpreter]: Interpretation finished [2020-12-09 20:44:03,702 WARN L197 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 60 [2020-12-09 20:44:04,123 WARN L197 SmtUtils]: Spent 164.00 ms on a formula simplification. DAG size of input: 76 DAG size of output: 62 [2020-12-09 20:44:04,278 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-12-09 20:44:04,278 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 20:44:04,279 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 81 [2020-12-09 20:44:04,279 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [730448430] [2020-12-09 20:44:04,279 INFO L461 AbstractCegarLoop]: Interpolant automaton has 83 states [2020-12-09 20:44:04,279 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 20:44:04,279 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 83 interpolants. [2020-12-09 20:44:04,280 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=852, Invalid=6804, Unknown=0, NotChecked=0, Total=7656 [2020-12-09 20:44:04,280 INFO L87 Difference]: Start difference. First operand 53 states and 54 transitions. Second operand 83 states. [2020-12-09 20:44:05,431 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 20:44:05,431 INFO L93 Difference]: Finished difference Result 56 states and 57 transitions. [2020-12-09 20:44:05,432 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-12-09 20:44:05,432 INFO L78 Accepts]: Start accepts. Automaton has 83 states. Word has length 52 [2020-12-09 20:44:05,432 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 20:44:05,432 INFO L225 Difference]: With dead ends: 56 [2020-12-09 20:44:05,432 INFO L226 Difference]: Without dead ends: 56 [2020-12-09 20:44:05,433 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 196 GetRequests, 95 SyntacticMatches, 0 SemanticMatches, 101 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3506 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=1600, Invalid=8906, Unknown=0, NotChecked=0, Total=10506 [2020-12-09 20:44:05,433 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-12-09 20:44:05,434 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 55. [2020-12-09 20:44:05,434 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-12-09 20:44:05,434 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 56 transitions. [2020-12-09 20:44:05,434 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 56 transitions. Word has length 52 [2020-12-09 20:44:05,434 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 20:44:05,434 INFO L481 AbstractCegarLoop]: Abstraction has 55 states and 56 transitions. [2020-12-09 20:44:05,434 INFO L482 AbstractCegarLoop]: Interpolant automaton has 83 states. [2020-12-09 20:44:05,434 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 56 transitions. [2020-12-09 20:44:05,435 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-12-09 20:44:05,435 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 20:44:05,435 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 12, 12, 1, 1, 1, 1] [2020-12-09 20:44:05,635 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable917 [2020-12-09 20:44:05,636 INFO L429 AbstractCegarLoop]: === Iteration 28 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr6ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr5REQUIRES_VIOLATION, ULTIMATE.startErr4REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION]=== [2020-12-09 20:44:05,637 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 20:44:05,637 INFO L82 PathProgramCache]: Analyzing trace with hash -1603317944, now seen corresponding path program 20 times [2020-12-09 20:44:05,637 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 20:44:05,638 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [997736558] [2020-12-09 20:44:05,638 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 20:44:05,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 20:44:06,264 INFO L134 CoverageAnalysis]: Checked inductivity of 313 backedges. 13 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 20:44:06,264 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [997736558] [2020-12-09 20:44:06,264 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1391300747] [2020-12-09 20:44:06,264 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_97282af7-25f2-48d5-aead-ef44704a1e15/bin/utaipan/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 20:44:06,428 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2020-12-09 20:44:06,428 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-09 20:44:06,431 INFO L263 TraceCheckSpWp]: Trace formula consists of 307 conjuncts, 93 conjunts are in the unsatisfiable core [2020-12-09 20:44:06,432 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 20:44:07,075 INFO L134 CoverageAnalysis]: Checked inductivity of 313 backedges. 13 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 20:44:07,076 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 20:44:07,544 INFO L134 CoverageAnalysis]: Checked inductivity of 313 backedges. 13 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 20:44:07,544 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [363289742] [2020-12-09 20:44:07,545 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2020-12-09 20:44:07,545 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 20:44:07,545 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-09 20:44:07,545 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-09 20:44:07,546 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-09 20:44:07,704 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 20:44:07,736 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 20:44:07,820 INFO L180 IcfgInterpreter]: Interpretation finished [2020-12-09 20:44:08,268 WARN L197 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 60 [2020-12-09 20:44:08,640 WARN L197 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 76 DAG size of output: 62 [2020-12-09 20:44:08,769 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-12-09 20:44:08,769 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 20:44:08,769 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 49 [2020-12-09 20:44:08,769 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [660462989] [2020-12-09 20:44:08,769 INFO L461 AbstractCegarLoop]: Interpolant automaton has 50 states [2020-12-09 20:44:08,770 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 20:44:08,770 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2020-12-09 20:44:08,770 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=142, Invalid=2828, Unknown=0, NotChecked=0, Total=2970 [2020-12-09 20:44:08,770 INFO L87 Difference]: Start difference. First operand 55 states and 56 transitions. Second operand 50 states. [2020-12-09 20:44:10,787 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 20:44:10,787 INFO L93 Difference]: Finished difference Result 85 states and 86 transitions. [2020-12-09 20:44:10,788 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-12-09 20:44:10,788 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 54 [2020-12-09 20:44:10,788 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 20:44:10,788 INFO L225 Difference]: With dead ends: 85 [2020-12-09 20:44:10,788 INFO L226 Difference]: Without dead ends: 58 [2020-12-09 20:44:10,789 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 218 GetRequests, 127 SyntacticMatches, 11 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 905 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=359, Invalid=6283, Unknown=0, NotChecked=0, Total=6642 [2020-12-09 20:44:10,789 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-12-09 20:44:10,790 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 57. [2020-12-09 20:44:10,790 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-12-09 20:44:10,790 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 58 transitions. [2020-12-09 20:44:10,790 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 58 transitions. Word has length 54 [2020-12-09 20:44:10,790 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 20:44:10,790 INFO L481 AbstractCegarLoop]: Abstraction has 57 states and 58 transitions. [2020-12-09 20:44:10,790 INFO L482 AbstractCegarLoop]: Interpolant automaton has 50 states. [2020-12-09 20:44:10,790 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 58 transitions. [2020-12-09 20:44:10,791 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-12-09 20:44:10,791 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 20:44:10,791 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 13, 13, 1, 1, 1, 1] [2020-12-09 20:44:10,991 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable971 [2020-12-09 20:44:10,992 INFO L429 AbstractCegarLoop]: === Iteration 29 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr6ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr5REQUIRES_VIOLATION, ULTIMATE.startErr4REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION]=== [2020-12-09 20:44:10,992 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 20:44:10,993 INFO L82 PathProgramCache]: Analyzing trace with hash 643033854, now seen corresponding path program 21 times [2020-12-09 20:44:10,993 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 20:44:10,993 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [16954116] [2020-12-09 20:44:10,994 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 20:44:11,008 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 20:44:11,558 INFO L134 CoverageAnalysis]: Checked inductivity of 338 backedges. 121 proven. 217 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 20:44:11,559 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [16954116] [2020-12-09 20:44:11,559 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1261815040] [2020-12-09 20:44:11,559 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_97282af7-25f2-48d5-aead-ef44704a1e15/bin/utaipan/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 20:44:11,727 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-09 20:44:11,727 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-09 20:44:11,730 INFO L263 TraceCheckSpWp]: Trace formula consists of 317 conjuncts, 82 conjunts are in the unsatisfiable core [2020-12-09 20:44:11,731 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 20:44:12,705 INFO L134 CoverageAnalysis]: Checked inductivity of 338 backedges. 144 proven. 194 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 20:44:12,705 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 20:44:14,056 INFO L134 CoverageAnalysis]: Checked inductivity of 338 backedges. 169 proven. 169 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 20:44:14,056 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1339619007] [2020-12-09 20:44:14,057 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2020-12-09 20:44:14,057 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 20:44:14,057 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-09 20:44:14,057 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-09 20:44:14,057 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-09 20:44:14,233 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 20:44:14,241 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 20:44:14,341 INFO L180 IcfgInterpreter]: Interpretation finished [2020-12-09 20:44:14,834 WARN L197 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 60 [2020-12-09 20:44:15,286 WARN L197 SmtUtils]: Spent 178.00 ms on a formula simplification. DAG size of input: 76 DAG size of output: 62 [2020-12-09 20:44:15,467 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-12-09 20:44:15,468 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 20:44:15,468 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 87 [2020-12-09 20:44:15,468 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1981417189] [2020-12-09 20:44:15,468 INFO L461 AbstractCegarLoop]: Interpolant automaton has 89 states [2020-12-09 20:44:15,468 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 20:44:15,468 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 89 interpolants. [2020-12-09 20:44:15,469 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=971, Invalid=7771, Unknown=0, NotChecked=0, Total=8742 [2020-12-09 20:44:15,469 INFO L87 Difference]: Start difference. First operand 57 states and 58 transitions. Second operand 89 states. [2020-12-09 20:44:16,748 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 20:44:16,749 INFO L93 Difference]: Finished difference Result 60 states and 61 transitions. [2020-12-09 20:44:16,749 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-12-09 20:44:16,749 INFO L78 Accepts]: Start accepts. Automaton has 89 states. Word has length 56 [2020-12-09 20:44:16,749 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 20:44:16,750 INFO L225 Difference]: With dead ends: 60 [2020-12-09 20:44:16,750 INFO L226 Difference]: Without dead ends: 60 [2020-12-09 20:44:16,750 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 211 GetRequests, 103 SyntacticMatches, 0 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4036 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=1825, Invalid=10165, Unknown=0, NotChecked=0, Total=11990 [2020-12-09 20:44:16,750 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-12-09 20:44:16,751 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 59. [2020-12-09 20:44:16,751 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-12-09 20:44:16,751 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 60 transitions. [2020-12-09 20:44:16,751 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 60 transitions. Word has length 56 [2020-12-09 20:44:16,752 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 20:44:16,752 INFO L481 AbstractCegarLoop]: Abstraction has 59 states and 60 transitions. [2020-12-09 20:44:16,752 INFO L482 AbstractCegarLoop]: Interpolant automaton has 89 states. [2020-12-09 20:44:16,752 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 60 transitions. [2020-12-09 20:44:16,752 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2020-12-09 20:44:16,752 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 20:44:16,752 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 13, 13, 1, 1, 1, 1] [2020-12-09 20:44:16,953 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1026,23 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 20:44:16,954 INFO L429 AbstractCegarLoop]: === Iteration 30 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr6ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr5REQUIRES_VIOLATION, ULTIMATE.startErr4REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION]=== [2020-12-09 20:44:16,954 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 20:44:16,955 INFO L82 PathProgramCache]: Analyzing trace with hash -519757049, now seen corresponding path program 22 times [2020-12-09 20:44:16,955 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 20:44:16,955 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [558270217] [2020-12-09 20:44:16,955 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 20:44:16,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 20:44:17,762 INFO L134 CoverageAnalysis]: Checked inductivity of 365 backedges. 14 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 20:44:17,762 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [558270217] [2020-12-09 20:44:17,762 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [659389962] [2020-12-09 20:44:17,762 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_97282af7-25f2-48d5-aead-ef44704a1e15/bin/utaipan/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 20:44:17,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 20:44:17,829 INFO L263 TraceCheckSpWp]: Trace formula consists of 328 conjuncts, 99 conjunts are in the unsatisfiable core [2020-12-09 20:44:17,830 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 20:44:18,589 INFO L134 CoverageAnalysis]: Checked inductivity of 365 backedges. 14 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 20:44:18,589 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 20:44:19,112 INFO L134 CoverageAnalysis]: Checked inductivity of 365 backedges. 14 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 20:44:19,112 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1212426632] [2020-12-09 20:44:19,113 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2020-12-09 20:44:19,113 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 20:44:19,113 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-09 20:44:19,113 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-09 20:44:19,113 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-09 20:44:19,271 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 20:44:19,279 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 20:44:19,385 INFO L180 IcfgInterpreter]: Interpretation finished [2020-12-09 20:44:19,864 WARN L197 SmtUtils]: Spent 167.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 60 [2020-12-09 20:44:20,300 WARN L197 SmtUtils]: Spent 161.00 ms on a formula simplification. DAG size of input: 76 DAG size of output: 62 [2020-12-09 20:44:20,455 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-12-09 20:44:20,455 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 20:44:20,455 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 52 [2020-12-09 20:44:20,455 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [673980184] [2020-12-09 20:44:20,456 INFO L461 AbstractCegarLoop]: Interpolant automaton has 53 states [2020-12-09 20:44:20,456 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 20:44:20,456 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2020-12-09 20:44:20,456 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=149, Invalid=3157, Unknown=0, NotChecked=0, Total=3306 [2020-12-09 20:44:20,456 INFO L87 Difference]: Start difference. First operand 59 states and 60 transitions. Second operand 53 states. [2020-12-09 20:44:22,639 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 20:44:22,639 INFO L93 Difference]: Finished difference Result 91 states and 92 transitions. [2020-12-09 20:44:22,640 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2020-12-09 20:44:22,640 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 58 [2020-12-09 20:44:22,640 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 20:44:22,640 INFO L225 Difference]: With dead ends: 91 [2020-12-09 20:44:22,640 INFO L226 Difference]: Without dead ends: 62 [2020-12-09 20:44:22,641 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 234 GetRequests, 137 SyntacticMatches, 12 SemanticMatches, 85 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 1020 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=381, Invalid=7101, Unknown=0, NotChecked=0, Total=7482 [2020-12-09 20:44:22,641 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2020-12-09 20:44:22,642 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 61. [2020-12-09 20:44:22,642 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-12-09 20:44:22,642 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 62 transitions. [2020-12-09 20:44:22,642 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 62 transitions. Word has length 58 [2020-12-09 20:44:22,642 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 20:44:22,642 INFO L481 AbstractCegarLoop]: Abstraction has 61 states and 62 transitions. [2020-12-09 20:44:22,642 INFO L482 AbstractCegarLoop]: Interpolant automaton has 53 states. [2020-12-09 20:44:22,642 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 62 transitions. [2020-12-09 20:44:22,642 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2020-12-09 20:44:22,643 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 20:44:22,643 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 14, 14, 1, 1, 1, 1] [2020-12-09 20:44:22,843 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1080 [2020-12-09 20:44:22,844 INFO L429 AbstractCegarLoop]: === Iteration 31 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr6ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr5REQUIRES_VIOLATION, ULTIMATE.startErr4REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION]=== [2020-12-09 20:44:22,844 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 20:44:22,845 INFO L82 PathProgramCache]: Analyzing trace with hash 1730737085, now seen corresponding path program 23 times [2020-12-09 20:44:22,845 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 20:44:22,846 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1880321883] [2020-12-09 20:44:22,846 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 20:44:22,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 20:44:23,533 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 144 proven. 248 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 20:44:23,533 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1880321883] [2020-12-09 20:44:23,534 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [567618827] [2020-12-09 20:44:23,534 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_97282af7-25f2-48d5-aead-ef44704a1e15/bin/utaipan/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 20:44:23,745 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2020-12-09 20:44:23,745 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-09 20:44:23,747 INFO L263 TraceCheckSpWp]: Trace formula consists of 338 conjuncts, 74 conjunts are in the unsatisfiable core [2020-12-09 20:44:23,749 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 20:44:24,952 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 169 proven. 223 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 20:44:24,952 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 20:44:26,642 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 196 proven. 196 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 20:44:26,642 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [874121383] [2020-12-09 20:44:26,643 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2020-12-09 20:44:26,643 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 20:44:26,643 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-09 20:44:26,644 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-09 20:44:26,644 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-09 20:44:26,843 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 20:44:26,849 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 20:44:26,932 INFO L180 IcfgInterpreter]: Interpretation finished [2020-12-09 20:44:27,429 WARN L197 SmtUtils]: Spent 157.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 60 [2020-12-09 20:44:27,865 WARN L197 SmtUtils]: Spent 161.00 ms on a formula simplification. DAG size of input: 76 DAG size of output: 62 [2020-12-09 20:44:28,016 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-12-09 20:44:28,016 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 20:44:28,016 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31] total 93 [2020-12-09 20:44:28,016 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1151278952] [2020-12-09 20:44:28,016 INFO L461 AbstractCegarLoop]: Interpolant automaton has 95 states [2020-12-09 20:44:28,017 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 20:44:28,017 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 95 interpolants. [2020-12-09 20:44:28,017 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1276, Invalid=8624, Unknown=0, NotChecked=0, Total=9900 [2020-12-09 20:44:28,017 INFO L87 Difference]: Start difference. First operand 61 states and 62 transitions. Second operand 95 states. [2020-12-09 20:44:29,386 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 20:44:29,386 INFO L93 Difference]: Finished difference Result 64 states and 65 transitions. [2020-12-09 20:44:29,387 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-12-09 20:44:29,387 INFO L78 Accepts]: Start accepts. Automaton has 95 states. Word has length 60 [2020-12-09 20:44:29,387 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 20:44:29,388 INFO L225 Difference]: With dead ends: 64 [2020-12-09 20:44:29,388 INFO L226 Difference]: Without dead ends: 64 [2020-12-09 20:44:29,388 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 226 GetRequests, 111 SyntacticMatches, 0 SemanticMatches, 115 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4397 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=2373, Invalid=11199, Unknown=0, NotChecked=0, Total=13572 [2020-12-09 20:44:29,388 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-12-09 20:44:29,389 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 63. [2020-12-09 20:44:29,389 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2020-12-09 20:44:29,390 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 64 transitions. [2020-12-09 20:44:29,390 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 64 transitions. Word has length 60 [2020-12-09 20:44:29,390 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 20:44:29,390 INFO L481 AbstractCegarLoop]: Abstraction has 63 states and 64 transitions. [2020-12-09 20:44:29,390 INFO L482 AbstractCegarLoop]: Interpolant automaton has 95 states. [2020-12-09 20:44:29,390 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 64 transitions. [2020-12-09 20:44:29,390 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2020-12-09 20:44:29,390 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 20:44:29,390 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 14, 14, 1, 1, 1, 1] [2020-12-09 20:44:29,591 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1135,25 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 20:44:29,591 INFO L429 AbstractCegarLoop]: === Iteration 32 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr6ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr5REQUIRES_VIOLATION, ULTIMATE.startErr4REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION]=== [2020-12-09 20:44:29,592 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 20:44:29,592 INFO L82 PathProgramCache]: Analyzing trace with hash 1085995014, now seen corresponding path program 24 times [2020-12-09 20:44:29,593 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 20:44:29,593 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1714271468] [2020-12-09 20:44:29,594 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 20:44:29,644 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 20:44:30,464 INFO L134 CoverageAnalysis]: Checked inductivity of 421 backedges. 15 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 20:44:30,464 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1714271468] [2020-12-09 20:44:30,464 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [74660981] [2020-12-09 20:44:30,464 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_97282af7-25f2-48d5-aead-ef44704a1e15/bin/utaipan/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 20:44:30,710 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-09 20:44:30,711 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-09 20:44:30,713 INFO L263 TraceCheckSpWp]: Trace formula consists of 349 conjuncts, 103 conjunts are in the unsatisfiable core [2020-12-09 20:44:30,715 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 20:44:31,562 INFO L134 CoverageAnalysis]: Checked inductivity of 421 backedges. 15 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 20:44:31,562 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 20:44:32,147 INFO L134 CoverageAnalysis]: Checked inductivity of 421 backedges. 15 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 20:44:32,147 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [739993067] [2020-12-09 20:44:32,148 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2020-12-09 20:44:32,148 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 20:44:32,148 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-09 20:44:32,148 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-09 20:44:32,148 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-09 20:44:32,363 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 20:44:32,370 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 20:44:32,451 INFO L180 IcfgInterpreter]: Interpretation finished [2020-12-09 20:44:32,940 WARN L197 SmtUtils]: Spent 156.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 63 [2020-12-09 20:44:33,424 WARN L197 SmtUtils]: Spent 180.00 ms on a formula simplification. DAG size of input: 76 DAG size of output: 65 [2020-12-09 20:44:33,587 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-12-09 20:44:33,587 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 20:44:33,587 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34] total 55 [2020-12-09 20:44:33,587 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [768851297] [2020-12-09 20:44:33,587 INFO L461 AbstractCegarLoop]: Interpolant automaton has 56 states [2020-12-09 20:44:33,587 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 20:44:33,588 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2020-12-09 20:44:33,588 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=156, Invalid=3504, Unknown=0, NotChecked=0, Total=3660 [2020-12-09 20:44:33,588 INFO L87 Difference]: Start difference. First operand 63 states and 64 transitions. Second operand 56 states. [2020-12-09 20:44:36,481 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 20:44:36,481 INFO L93 Difference]: Finished difference Result 97 states and 98 transitions. [2020-12-09 20:44:36,482 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2020-12-09 20:44:36,482 INFO L78 Accepts]: Start accepts. Automaton has 56 states. Word has length 62 [2020-12-09 20:44:36,482 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 20:44:36,483 INFO L225 Difference]: With dead ends: 97 [2020-12-09 20:44:36,483 INFO L226 Difference]: Without dead ends: 66 [2020-12-09 20:44:36,483 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 250 GetRequests, 148 SyntacticMatches, 12 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 1122 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=403, Invalid=7969, Unknown=0, NotChecked=0, Total=8372 [2020-12-09 20:44:36,483 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2020-12-09 20:44:36,484 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 65. [2020-12-09 20:44:36,484 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2020-12-09 20:44:36,484 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 66 transitions. [2020-12-09 20:44:36,484 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 66 transitions. Word has length 62 [2020-12-09 20:44:36,484 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 20:44:36,484 INFO L481 AbstractCegarLoop]: Abstraction has 65 states and 66 transitions. [2020-12-09 20:44:36,485 INFO L482 AbstractCegarLoop]: Interpolant automaton has 56 states. [2020-12-09 20:44:36,485 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 66 transitions. [2020-12-09 20:44:36,485 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2020-12-09 20:44:36,485 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 20:44:36,485 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 15, 15, 1, 1, 1, 1] [2020-12-09 20:44:36,685 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1189 [2020-12-09 20:44:36,685 INFO L429 AbstractCegarLoop]: === Iteration 33 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr6ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr5REQUIRES_VIOLATION, ULTIMATE.startErr4REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION]=== [2020-12-09 20:44:36,686 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 20:44:36,686 INFO L82 PathProgramCache]: Analyzing trace with hash 2054913468, now seen corresponding path program 25 times [2020-12-09 20:44:36,686 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 20:44:36,686 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [590846389] [2020-12-09 20:44:36,686 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 20:44:36,707 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 20:44:37,400 INFO L134 CoverageAnalysis]: Checked inductivity of 450 backedges. 169 proven. 281 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 20:44:37,400 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [590846389] [2020-12-09 20:44:37,400 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2083933046] [2020-12-09 20:44:37,400 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_97282af7-25f2-48d5-aead-ef44704a1e15/bin/utaipan/z3 Starting monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 20:44:37,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 20:44:37,463 INFO L263 TraceCheckSpWp]: Trace formula consists of 359 conjuncts, 92 conjunts are in the unsatisfiable core [2020-12-09 20:44:37,464 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 20:44:38,879 INFO L134 CoverageAnalysis]: Checked inductivity of 450 backedges. 196 proven. 254 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 20:44:38,879 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 20:44:40,827 INFO L134 CoverageAnalysis]: Checked inductivity of 450 backedges. 225 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 20:44:40,827 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [536999959] [2020-12-09 20:44:40,828 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2020-12-09 20:44:40,828 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 20:44:40,828 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-09 20:44:40,828 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-09 20:44:40,828 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-09 20:44:40,909 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 20:44:41,078 INFO L180 IcfgInterpreter]: Interpretation finished [2020-12-09 20:44:41,442 WARN L197 SmtUtils]: Spent 153.00 ms on a formula simplification. DAG size of input: 79 DAG size of output: 44 [2020-12-09 20:44:42,245 WARN L197 SmtUtils]: Spent 207.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 61 [2020-12-09 20:44:42,423 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-12-09 20:44:42,423 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 20:44:42,423 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33] total 99 [2020-12-09 20:44:42,423 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1184777758] [2020-12-09 20:44:42,424 INFO L461 AbstractCegarLoop]: Interpolant automaton has 101 states [2020-12-09 20:44:42,424 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 20:44:42,424 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 101 interpolants. [2020-12-09 20:44:42,425 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1241, Invalid=10101, Unknown=0, NotChecked=0, Total=11342 [2020-12-09 20:44:42,425 INFO L87 Difference]: Start difference. First operand 65 states and 66 transitions. Second operand 101 states. [2020-12-09 20:44:44,626 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 20:44:44,626 INFO L93 Difference]: Finished difference Result 68 states and 69 transitions. [2020-12-09 20:44:44,627 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-12-09 20:44:44,627 INFO L78 Accepts]: Start accepts. Automaton has 101 states. Word has length 64 [2020-12-09 20:44:44,627 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 20:44:44,628 INFO L225 Difference]: With dead ends: 68 [2020-12-09 20:44:44,628 INFO L226 Difference]: Without dead ends: 68 [2020-12-09 20:44:44,629 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 241 GetRequests, 118 SyntacticMatches, 0 SemanticMatches, 123 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5359 ImplicationChecksByTransitivity, 5.6s TimeCoverageRelationStatistics Valid=2328, Invalid=13172, Unknown=0, NotChecked=0, Total=15500 [2020-12-09 20:44:44,629 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-12-09 20:44:44,630 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 67. [2020-12-09 20:44:44,630 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2020-12-09 20:44:44,630 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 68 transitions. [2020-12-09 20:44:44,630 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 68 transitions. Word has length 64 [2020-12-09 20:44:44,630 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 20:44:44,630 INFO L481 AbstractCegarLoop]: Abstraction has 67 states and 68 transitions. [2020-12-09 20:44:44,631 INFO L482 AbstractCegarLoop]: Interpolant automaton has 101 states. [2020-12-09 20:44:44,631 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 68 transitions. [2020-12-09 20:44:44,631 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2020-12-09 20:44:44,631 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 20:44:44,631 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 15, 15, 1, 1, 1, 1] [2020-12-09 20:44:44,832 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1244 [2020-12-09 20:44:44,832 INFO L429 AbstractCegarLoop]: === Iteration 34 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr6ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr5REQUIRES_VIOLATION, ULTIMATE.startErr4REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION]=== [2020-12-09 20:44:44,833 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 20:44:44,833 INFO L82 PathProgramCache]: Analyzing trace with hash -913113531, now seen corresponding path program 26 times [2020-12-09 20:44:44,834 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 20:44:44,834 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1901794870] [2020-12-09 20:44:44,834 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 20:44:44,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 20:44:45,734 INFO L134 CoverageAnalysis]: Checked inductivity of 481 backedges. 16 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 20:44:45,734 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1901794870] [2020-12-09 20:44:45,734 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1938527958] [2020-12-09 20:44:45,734 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_97282af7-25f2-48d5-aead-ef44704a1e15/bin/utaipan/z3 Starting monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 20:44:46,011 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 17 check-sat command(s) [2020-12-09 20:44:46,011 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-09 20:44:46,014 INFO L263 TraceCheckSpWp]: Trace formula consists of 370 conjuncts, 54 conjunts are in the unsatisfiable core [2020-12-09 20:44:46,016 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 20:44:46,330 INFO L134 CoverageAnalysis]: Checked inductivity of 481 backedges. 0 proven. 31 refuted. 0 times theorem prover too weak. 450 trivial. 0 not checked. [2020-12-09 20:44:46,330 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 20:44:46,841 INFO L134 CoverageAnalysis]: Checked inductivity of 481 backedges. 0 proven. 31 refuted. 0 times theorem prover too weak. 450 trivial. 0 not checked. [2020-12-09 20:44:46,842 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1754666990] [2020-12-09 20:44:46,842 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2020-12-09 20:44:46,842 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 20:44:46,843 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-09 20:44:46,843 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-09 20:44:46,843 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-09 20:44:46,909 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 20:44:47,076 INFO L180 IcfgInterpreter]: Interpretation finished [2020-12-09 20:44:47,454 WARN L197 SmtUtils]: Spent 184.00 ms on a formula simplification. DAG size of input: 79 DAG size of output: 44 [2020-12-09 20:44:48,212 WARN L197 SmtUtils]: Spent 226.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 61 [2020-12-09 20:44:48,366 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-12-09 20:44:48,366 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 20:44:48,366 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 4, 4] total 44 [2020-12-09 20:44:48,366 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1540345304] [2020-12-09 20:44:48,367 INFO L461 AbstractCegarLoop]: Interpolant automaton has 45 states [2020-12-09 20:44:48,367 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 20:44:48,367 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2020-12-09 20:44:48,367 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=2436, Unknown=0, NotChecked=0, Total=2550 [2020-12-09 20:44:48,367 INFO L87 Difference]: Start difference. First operand 67 states and 68 transitions. Second operand 45 states. [2020-12-09 20:44:52,742 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 20:44:52,743 INFO L93 Difference]: Finished difference Result 102 states and 103 transitions. [2020-12-09 20:44:52,743 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2020-12-09 20:44:52,743 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 66 [2020-12-09 20:44:52,743 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 20:44:52,743 INFO L225 Difference]: With dead ends: 102 [2020-12-09 20:44:52,743 INFO L226 Difference]: Without dead ends: 0 [2020-12-09 20:44:52,744 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 286 GetRequests, 183 SyntacticMatches, 1 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1485 ImplicationChecksByTransitivity, 5.6s TimeCoverageRelationStatistics Valid=791, Invalid=9921, Unknown=0, NotChecked=0, Total=10712 [2020-12-09 20:44:52,744 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-12-09 20:44:52,744 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-12-09 20:44:52,744 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-12-09 20:44:52,744 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-12-09 20:44:52,744 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 66 [2020-12-09 20:44:52,744 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 20:44:52,744 INFO L481 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-12-09 20:44:52,744 INFO L482 AbstractCegarLoop]: Interpolant automaton has 45 states. [2020-12-09 20:44:52,744 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-12-09 20:44:52,744 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-12-09 20:44:52,945 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1288 [2020-12-09 20:44:52,955 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 09.12 08:44:52 BoogieIcfgContainer [2020-12-09 20:44:52,955 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-12-09 20:44:52,957 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-12-09 20:44:52,957 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-12-09 20:44:52,957 INFO L275 PluginConnector]: Witness Printer initialized [2020-12-09 20:44:52,958 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.12 08:42:53" (3/4) ... [2020-12-09 20:44:52,961 INFO L137 WitnessPrinter]: Generating witness for correct program [2020-12-09 20:44:52,967 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 13 nodes and edges [2020-12-09 20:44:52,967 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 6 nodes and edges [2020-12-09 20:44:52,967 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 2 nodes and edges [2020-12-09 20:44:52,987 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/run_dir_97282af7-25f2-48d5-aead-ef44704a1e15/bin/utaipan/witness.graphml [2020-12-09 20:44:52,988 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-12-09 20:44:52,988 INFO L168 Benchmark]: Toolchain (without parser) took 120620.34 ms. Allocated memory was 92.3 MB in the beginning and 167.8 MB in the end (delta: 75.5 MB). Free memory was 50.8 MB in the beginning and 84.8 MB in the end (delta: -34.0 MB). Peak memory consumption was 44.1 MB. Max. memory is 16.1 GB. [2020-12-09 20:44:52,988 INFO L168 Benchmark]: CDTParser took 0.12 ms. Allocated memory is still 92.3 MB. Free memory is still 68.0 MB. There was no memory consumed. Max. memory is 16.1 GB. [2020-12-09 20:44:52,989 INFO L168 Benchmark]: CACSL2BoogieTranslator took 266.06 ms. Allocated memory is still 92.3 MB. Free memory was 50.6 MB in the beginning and 53.9 MB in the end (delta: -3.2 MB). Peak memory consumption was 7.4 MB. Max. memory is 16.1 GB. [2020-12-09 20:44:52,989 INFO L168 Benchmark]: Boogie Procedure Inliner took 32.20 ms. Allocated memory is still 92.3 MB. Free memory was 53.9 MB in the beginning and 52.1 MB in the end (delta: 1.8 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-12-09 20:44:52,989 INFO L168 Benchmark]: Boogie Preprocessor took 22.75 ms. Allocated memory is still 92.3 MB. Free memory was 52.1 MB in the beginning and 50.9 MB in the end (delta: 1.2 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-12-09 20:44:52,989 INFO L168 Benchmark]: RCFGBuilder took 347.11 ms. Allocated memory is still 92.3 MB. Free memory was 50.9 MB in the beginning and 52.1 MB in the end (delta: -1.2 MB). Peak memory consumption was 4.2 MB. Max. memory is 16.1 GB. [2020-12-09 20:44:52,989 INFO L168 Benchmark]: TraceAbstraction took 119915.52 ms. Allocated memory was 92.3 MB in the beginning and 167.8 MB in the end (delta: 75.5 MB). Free memory was 51.9 MB in the beginning and 87.7 MB in the end (delta: -35.8 MB). Peak memory consumption was 43.6 MB. Max. memory is 16.1 GB. [2020-12-09 20:44:52,990 INFO L168 Benchmark]: Witness Printer took 31.08 ms. Allocated memory is still 167.8 MB. Free memory was 87.7 MB in the beginning and 84.8 MB in the end (delta: 2.9 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-12-09 20:44:52,991 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.12 ms. Allocated memory is still 92.3 MB. Free memory is still 68.0 MB. There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 266.06 ms. Allocated memory is still 92.3 MB. Free memory was 50.6 MB in the beginning and 53.9 MB in the end (delta: -3.2 MB). Peak memory consumption was 7.4 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 32.20 ms. Allocated memory is still 92.3 MB. Free memory was 53.9 MB in the beginning and 52.1 MB in the end (delta: 1.8 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Boogie Preprocessor took 22.75 ms. Allocated memory is still 92.3 MB. Free memory was 52.1 MB in the beginning and 50.9 MB in the end (delta: 1.2 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * RCFGBuilder took 347.11 ms. Allocated memory is still 92.3 MB. Free memory was 50.9 MB in the beginning and 52.1 MB in the end (delta: -1.2 MB). Peak memory consumption was 4.2 MB. Max. memory is 16.1 GB. * TraceAbstraction took 119915.52 ms. Allocated memory was 92.3 MB in the beginning and 167.8 MB in the end (delta: 75.5 MB). Free memory was 51.9 MB in the beginning and 87.7 MB in the end (delta: -35.8 MB). Peak memory consumption was 43.6 MB. Max. memory is 16.1 GB. * Witness Printer took 31.08 ms. Allocated memory is still 167.8 MB. Free memory was 87.7 MB in the beginning and 84.8 MB in the end (delta: 2.9 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 530]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 530]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 522]: all allocated memory was freed For all program executions holds that all allocated memory was freed at this location - PositiveResult [Line: 518]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 518]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 532]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 532]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - AllSpecificationsHoldResult: All specifications hold 7 specifications checked. All of them hold - StatisticsResult: Ultimate Automizer benchmark data CFG has 1 procedures, 16 locations, 7 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 119.8s, OverallIterations: 34, TraceHistogramMax: 16, AutomataDifference: 33.9s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 96 SDtfs, 3138 SDslu, 506 SDs, 0 SdLazy, 28703 SolverSat, 2467 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 10.1s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 4171 GetRequests, 2094 SyntacticMatches, 83 SemanticMatches, 1994 ConstructedPredicates, 0 IntricatePredicates, 8 DeprecatedPredicates, 41580 ImplicationChecksByTransitivity, 82.8s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=67occurred in iteration=33, 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, 34 MinimizatonAttempts, 58 StatesRemovedByMinimization, 28 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.3s SsaConstructionTime, 2.4s SatisfiabilityAnalysisTime, 46.1s InterpolantComputationTime, 2124 NumberOfCodeBlocks, 2124 NumberOfCodeBlocksAsserted, 156 NumberOfCheckSat, 3083 ConstructedInterpolants, 118 QuantifiedInterpolants, 1675939 SizeOfPredicates, 325 NumberOfNonLiveVariables, 6116 ConjunctsInSsa, 1702 ConjunctsInUnsatCore, 88 InterpolantComputations, 7 PerfectInterpolantSequences, 4623/15382 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...