./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/array-memsafety/cstrlen_unsafe.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_dbfac229-bc90-4acf-9af1-66e734163255/bin/utaipan/data/config -Xmx15G -Xms4m -jar /tmp/vcloud-vcloud-master/worker/run_dir_dbfac229-bc90-4acf-9af1-66e734163255/bin/utaipan/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_dbfac229-bc90-4acf-9af1-66e734163255/bin/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_dbfac229-bc90-4acf-9af1-66e734163255/bin/utaipan/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/array-memsafety/cstrlen_unsafe.i -s /tmp/vcloud-vcloud-master/worker/run_dir_dbfac229-bc90-4acf-9af1-66e734163255/bin/utaipan/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_dbfac229-bc90-4acf-9af1-66e734163255/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 15362e3354379e86b7768de02eb760f50ed72879 ............................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ Execution finished normally Writing output log to file Ultimate.log Writing human readable error path to file UltimateCounterExample.errorpath Result: FALSE(valid-deref) --- Real Ultimate output --- This is Ultimate 0.2.0-7b2dab5 [2020-12-09 06:34:19,611 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-12-09 06:34:19,613 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-12-09 06:34:19,640 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-12-09 06:34:19,640 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-12-09 06:34:19,641 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-12-09 06:34:19,642 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-12-09 06:34:19,644 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-12-09 06:34:19,645 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-12-09 06:34:19,646 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-12-09 06:34:19,647 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-12-09 06:34:19,648 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-12-09 06:34:19,648 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-12-09 06:34:19,649 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-12-09 06:34:19,650 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-12-09 06:34:19,651 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-12-09 06:34:19,651 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-12-09 06:34:19,652 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-12-09 06:34:19,654 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-12-09 06:34:19,655 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-12-09 06:34:19,656 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-12-09 06:34:19,658 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-12-09 06:34:19,659 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-12-09 06:34:19,659 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-12-09 06:34:19,662 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-12-09 06:34:19,662 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-12-09 06:34:19,662 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-12-09 06:34:19,663 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-12-09 06:34:19,663 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-12-09 06:34:19,664 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-12-09 06:34:19,664 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-12-09 06:34:19,665 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-12-09 06:34:19,666 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-12-09 06:34:19,666 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-12-09 06:34:19,667 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-12-09 06:34:19,667 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-12-09 06:34:19,668 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-12-09 06:34:19,668 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-12-09 06:34:19,668 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-12-09 06:34:19,669 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-12-09 06:34:19,670 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-12-09 06:34:19,670 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/run_dir_dbfac229-bc90-4acf-9af1-66e734163255/bin/utaipan/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2020-12-09 06:34:19,687 INFO L113 SettingsManager]: Loading preferences was successful [2020-12-09 06:34:19,687 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-12-09 06:34:19,688 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2020-12-09 06:34:19,688 INFO L138 SettingsManager]: * User list type=DISABLED [2020-12-09 06:34:19,688 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2020-12-09 06:34:19,688 INFO L138 SettingsManager]: * Explicit value domain=true [2020-12-09 06:34:19,688 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2020-12-09 06:34:19,688 INFO L138 SettingsManager]: * Octagon Domain=false [2020-12-09 06:34:19,688 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2020-12-09 06:34:19,688 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2020-12-09 06:34:19,688 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2020-12-09 06:34:19,689 INFO L138 SettingsManager]: * Interval Domain=false [2020-12-09 06:34:19,689 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2020-12-09 06:34:19,689 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2020-12-09 06:34:19,689 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2020-12-09 06:34:19,689 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-12-09 06:34:19,689 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-12-09 06:34:19,690 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-12-09 06:34:19,690 INFO L138 SettingsManager]: * sizeof long=4 [2020-12-09 06:34:19,690 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2020-12-09 06:34:19,690 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-12-09 06:34:19,690 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-12-09 06:34:19,690 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-12-09 06:34:19,690 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2020-12-09 06:34:19,690 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2020-12-09 06:34:19,690 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2020-12-09 06:34:19,690 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-12-09 06:34:19,691 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2020-12-09 06:34:19,691 INFO L138 SettingsManager]: * sizeof long double=12 [2020-12-09 06:34:19,691 INFO L138 SettingsManager]: * Use constant arrays=true [2020-12-09 06:34:19,691 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-12-09 06:34:19,691 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-12-09 06:34:19,691 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-12-09 06:34:19,691 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-12-09 06:34:19,691 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-12-09 06:34:19,691 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2020-12-09 06:34:19,692 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-12-09 06:34:19,692 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-12-09 06:34:19,692 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2020-12-09 06:34:19,692 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_dbfac229-bc90-4acf-9af1-66e734163255/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud-vcloud-master/worker/run_dir_dbfac229-bc90-4acf-9af1-66e734163255/bin/utaipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 15362e3354379e86b7768de02eb760f50ed72879 [2020-12-09 06:34:19,884 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-12-09 06:34:19,900 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-12-09 06:34:19,902 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-12-09 06:34:19,903 INFO L271 PluginConnector]: Initializing CDTParser... [2020-12-09 06:34:19,904 INFO L275 PluginConnector]: CDTParser initialized [2020-12-09 06:34:19,905 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_dbfac229-bc90-4acf-9af1-66e734163255/bin/utaipan/../../sv-benchmarks/c/array-memsafety/cstrlen_unsafe.i [2020-12-09 06:34:19,948 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_dbfac229-bc90-4acf-9af1-66e734163255/bin/utaipan/data/f91ff5147/8c27a773c71a4972ba7999296e3b06b6/FLAG5f54ed52e [2020-12-09 06:34:20,342 INFO L306 CDTParser]: Found 1 translation units. [2020-12-09 06:34:20,343 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_dbfac229-bc90-4acf-9af1-66e734163255/sv-benchmarks/c/array-memsafety/cstrlen_unsafe.i [2020-12-09 06:34:20,352 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_dbfac229-bc90-4acf-9af1-66e734163255/bin/utaipan/data/f91ff5147/8c27a773c71a4972ba7999296e3b06b6/FLAG5f54ed52e [2020-12-09 06:34:20,361 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_dbfac229-bc90-4acf-9af1-66e734163255/bin/utaipan/data/f91ff5147/8c27a773c71a4972ba7999296e3b06b6 [2020-12-09 06:34:20,362 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-12-09 06:34:20,363 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-12-09 06:34:20,365 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-12-09 06:34:20,365 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-12-09 06:34:20,367 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-12-09 06:34:20,367 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 09.12 06:34:20" (1/1) ... [2020-12-09 06:34:20,368 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3eccef70 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 06:34:20, skipping insertion in model container [2020-12-09 06:34:20,369 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 09.12 06:34:20" (1/1) ... [2020-12-09 06:34:20,373 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-12-09 06:34:20,401 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-12-09 06:34:20,574 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-09 06:34:20,579 INFO L203 MainTranslator]: Completed pre-run [2020-12-09 06:34:20,605 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-09 06:34:20,638 INFO L208 MainTranslator]: Completed translation [2020-12-09 06:34:20,638 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 06:34:20 WrapperNode [2020-12-09 06:34:20,638 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-12-09 06:34:20,639 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-12-09 06:34:20,639 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-12-09 06:34:20,639 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-12-09 06:34:20,645 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 06:34:20" (1/1) ... [2020-12-09 06:34:20,654 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 06:34:20" (1/1) ... [2020-12-09 06:34:20,667 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-12-09 06:34:20,668 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-12-09 06:34:20,668 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-12-09 06:34:20,668 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-12-09 06:34:20,673 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 06:34:20" (1/1) ... [2020-12-09 06:34:20,673 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 06:34:20" (1/1) ... [2020-12-09 06:34:20,676 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 06:34:20" (1/1) ... [2020-12-09 06:34:20,676 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 06:34:20" (1/1) ... [2020-12-09 06:34:20,680 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 06:34:20" (1/1) ... [2020-12-09 06:34:20,683 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 06:34:20" (1/1) ... [2020-12-09 06:34:20,684 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 06:34:20" (1/1) ... [2020-12-09 06:34:20,686 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-12-09 06:34:20,686 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-12-09 06:34:20,686 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-12-09 06:34:20,687 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-12-09 06:34:20,687 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 06:34:20" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_dbfac229-bc90-4acf-9af1-66e734163255/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 06:34:20,748 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-12-09 06:34:20,748 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-12-09 06:34:20,748 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2020-12-09 06:34:20,748 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-12-09 06:34:20,748 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-12-09 06:34:20,749 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-12-09 06:34:21,021 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-12-09 06:34:21,022 INFO L299 CfgBuilder]: Removed 10 assume(true) statements. [2020-12-09 06:34:21,024 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.12 06:34:21 BoogieIcfgContainer [2020-12-09 06:34:21,024 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-12-09 06:34:21,025 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-12-09 06:34:21,026 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-12-09 06:34:21,028 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-12-09 06:34:21,028 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 09.12 06:34:20" (1/3) ... [2020-12-09 06:34:21,029 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@46264f0b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 09.12 06:34:21, skipping insertion in model container [2020-12-09 06:34:21,029 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 06:34:20" (2/3) ... [2020-12-09 06:34:21,029 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@46264f0b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 09.12 06:34:21, skipping insertion in model container [2020-12-09 06:34:21,029 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.12 06:34:21" (3/3) ... [2020-12-09 06:34:21,030 INFO L111 eAbstractionObserver]: Analyzing ICFG cstrlen_unsafe.i [2020-12-09 06:34:21,040 INFO L180 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-12-09 06:34:21,043 INFO L192 ceAbstractionStarter]: Appying trace abstraction to program that has 10 error locations. [2020-12-09 06:34:21,049 INFO L253 AbstractCegarLoop]: Starting to check reachability of 10 error locations. [2020-12-09 06:34:21,065 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-12-09 06:34:21,066 INFO L378 AbstractCegarLoop]: Hoare is false [2020-12-09 06:34:21,066 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-12-09 06:34:21,066 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-12-09 06:34:21,066 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-12-09 06:34:21,066 INFO L382 AbstractCegarLoop]: Difference is false [2020-12-09 06:34:21,066 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-12-09 06:34:21,066 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-12-09 06:34:21,075 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states. [2020-12-09 06:34:21,079 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2020-12-09 06:34:21,080 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 06:34:21,080 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1] [2020-12-09 06:34:21,080 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr7ASSERT_VIOLATIONMEMORY_FREE, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr8ASSERT_VIOLATIONMEMORY_FREE, ULTIMATE.startErr5REQUIRES_VIOLATION, ULTIMATE.startErr4REQUIRES_VIOLATION, ULTIMATE.startErr9ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr3REQUIRES_VIOLATION, ULTIMATE.startErr6ASSERT_VIOLATIONMEMORY_FREE, ULTIMATE.startErr2REQUIRES_VIOLATION]=== [2020-12-09 06:34:21,084 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 06:34:21,084 INFO L82 PathProgramCache]: Analyzing trace with hash 97607, now seen corresponding path program 1 times [2020-12-09 06:34:21,090 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 06:34:21,091 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [949454669] [2020-12-09 06:34:21,091 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 06:34:21,161 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 06:34:21,203 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 06:34:21,204 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [949454669] [2020-12-09 06:34:21,204 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-09 06:34:21,204 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2020-12-09 06:34:21,205 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1849821315] [2020-12-09 06:34:21,208 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-12-09 06:34:21,208 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 06:34:21,218 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-12-09 06:34:21,219 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-09 06:34:21,220 INFO L87 Difference]: Start difference. First operand 22 states. Second operand 3 states. [2020-12-09 06:34:21,250 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 06:34:21,251 INFO L93 Difference]: Finished difference Result 20 states and 21 transitions. [2020-12-09 06:34:21,251 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-12-09 06:34:21,252 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 3 [2020-12-09 06:34:21,253 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 06:34:21,260 INFO L225 Difference]: With dead ends: 20 [2020-12-09 06:34:21,260 INFO L226 Difference]: Without dead ends: 19 [2020-12-09 06:34:21,261 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 06:34:21,274 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-12-09 06:34:21,282 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2020-12-09 06:34:21,283 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-12-09 06:34:21,284 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2020-12-09 06:34:21,285 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 3 [2020-12-09 06:34:21,285 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 06:34:21,286 INFO L481 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2020-12-09 06:34:21,286 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-12-09 06:34:21,286 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2020-12-09 06:34:21,286 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2020-12-09 06:34:21,286 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 06:34:21,286 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1] [2020-12-09 06:34:21,286 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-12-09 06:34:21,287 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr7ASSERT_VIOLATIONMEMORY_FREE, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr8ASSERT_VIOLATIONMEMORY_FREE, ULTIMATE.startErr5REQUIRES_VIOLATION, ULTIMATE.startErr4REQUIRES_VIOLATION, ULTIMATE.startErr9ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr3REQUIRES_VIOLATION, ULTIMATE.startErr6ASSERT_VIOLATIONMEMORY_FREE, ULTIMATE.startErr2REQUIRES_VIOLATION]=== [2020-12-09 06:34:21,287 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 06:34:21,288 INFO L82 PathProgramCache]: Analyzing trace with hash 97608, now seen corresponding path program 1 times [2020-12-09 06:34:21,288 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 06:34:21,288 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1343910799] [2020-12-09 06:34:21,288 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 06:34:21,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 06:34:21,346 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 06:34:21,346 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1343910799] [2020-12-09 06:34:21,347 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-09 06:34:21,347 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-12-09 06:34:21,347 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1943035446] [2020-12-09 06:34:21,348 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-12-09 06:34:21,349 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 06:34:21,349 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-12-09 06:34:21,350 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-12-09 06:34:21,350 INFO L87 Difference]: Start difference. First operand 19 states and 20 transitions. Second operand 4 states. [2020-12-09 06:34:21,392 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 06:34:21,393 INFO L93 Difference]: Finished difference Result 36 states and 38 transitions. [2020-12-09 06:34:21,393 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-12-09 06:34:21,393 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 3 [2020-12-09 06:34:21,393 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 06:34:21,394 INFO L225 Difference]: With dead ends: 36 [2020-12-09 06:34:21,394 INFO L226 Difference]: Without dead ends: 36 [2020-12-09 06:34:21,395 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 06:34:21,395 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-12-09 06:34:21,398 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 21. [2020-12-09 06:34:21,398 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-12-09 06:34:21,399 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 23 transitions. [2020-12-09 06:34:21,399 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 23 transitions. Word has length 3 [2020-12-09 06:34:21,399 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 06:34:21,399 INFO L481 AbstractCegarLoop]: Abstraction has 21 states and 23 transitions. [2020-12-09 06:34:21,399 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-12-09 06:34:21,399 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 23 transitions. [2020-12-09 06:34:21,400 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2020-12-09 06:34:21,400 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 06:34:21,400 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1] [2020-12-09 06:34:21,400 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-12-09 06:34:21,400 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr7ASSERT_VIOLATIONMEMORY_FREE, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr8ASSERT_VIOLATIONMEMORY_FREE, ULTIMATE.startErr5REQUIRES_VIOLATION, ULTIMATE.startErr4REQUIRES_VIOLATION, ULTIMATE.startErr9ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr3REQUIRES_VIOLATION, ULTIMATE.startErr6ASSERT_VIOLATIONMEMORY_FREE, ULTIMATE.startErr2REQUIRES_VIOLATION]=== [2020-12-09 06:34:21,401 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 06:34:21,401 INFO L82 PathProgramCache]: Analyzing trace with hash 99291, now seen corresponding path program 1 times [2020-12-09 06:34:21,401 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 06:34:21,401 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2034928694] [2020-12-09 06:34:21,401 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 06:34:21,416 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 06:34:21,448 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 06:34:21,448 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2034928694] [2020-12-09 06:34:21,448 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-09 06:34:21,449 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2020-12-09 06:34:21,449 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1986923376] [2020-12-09 06:34:21,449 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-12-09 06:34:21,449 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 06:34:21,450 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-12-09 06:34:21,450 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-09 06:34:21,451 INFO L87 Difference]: Start difference. First operand 21 states and 23 transitions. Second operand 3 states. [2020-12-09 06:34:21,463 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 06:34:21,463 INFO L93 Difference]: Finished difference Result 20 states and 22 transitions. [2020-12-09 06:34:21,463 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-12-09 06:34:21,464 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 3 [2020-12-09 06:34:21,464 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 06:34:21,464 INFO L225 Difference]: With dead ends: 20 [2020-12-09 06:34:21,464 INFO L226 Difference]: Without dead ends: 20 [2020-12-09 06:34:21,465 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 06:34:21,465 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-12-09 06:34:21,467 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-12-09 06:34:21,467 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-12-09 06:34:21,468 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2020-12-09 06:34:21,468 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 3 [2020-12-09 06:34:21,468 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 06:34:21,468 INFO L481 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2020-12-09 06:34:21,468 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-12-09 06:34:21,468 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2020-12-09 06:34:21,469 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2020-12-09 06:34:21,469 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 06:34:21,469 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2020-12-09 06:34:21,469 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-12-09 06:34:21,469 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr7ASSERT_VIOLATIONMEMORY_FREE, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr8ASSERT_VIOLATIONMEMORY_FREE, ULTIMATE.startErr5REQUIRES_VIOLATION, ULTIMATE.startErr4REQUIRES_VIOLATION, ULTIMATE.startErr9ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr3REQUIRES_VIOLATION, ULTIMATE.startErr6ASSERT_VIOLATIONMEMORY_FREE, ULTIMATE.startErr2REQUIRES_VIOLATION]=== [2020-12-09 06:34:21,470 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 06:34:21,470 INFO L82 PathProgramCache]: Analyzing trace with hash 3079237, now seen corresponding path program 1 times [2020-12-09 06:34:21,470 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 06:34:21,470 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [340336285] [2020-12-09 06:34:21,470 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 06:34:21,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 06:34:21,499 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 06:34:21,499 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [340336285] [2020-12-09 06:34:21,499 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-09 06:34:21,499 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-12-09 06:34:21,500 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1198853042] [2020-12-09 06:34:21,500 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-12-09 06:34:21,500 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 06:34:21,500 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-12-09 06:34:21,500 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-09 06:34:21,501 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand 3 states. [2020-12-09 06:34:21,514 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 06:34:21,514 INFO L93 Difference]: Finished difference Result 19 states and 21 transitions. [2020-12-09 06:34:21,515 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-12-09 06:34:21,515 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 4 [2020-12-09 06:34:21,515 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 06:34:21,515 INFO L225 Difference]: With dead ends: 19 [2020-12-09 06:34:21,515 INFO L226 Difference]: Without dead ends: 19 [2020-12-09 06:34:21,516 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 06:34:21,516 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-12-09 06:34:21,518 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2020-12-09 06:34:21,518 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-12-09 06:34:21,519 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 21 transitions. [2020-12-09 06:34:21,519 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 21 transitions. Word has length 4 [2020-12-09 06:34:21,519 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 06:34:21,519 INFO L481 AbstractCegarLoop]: Abstraction has 19 states and 21 transitions. [2020-12-09 06:34:21,519 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-12-09 06:34:21,519 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 21 transitions. [2020-12-09 06:34:21,519 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2020-12-09 06:34:21,519 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 06:34:21,520 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2020-12-09 06:34:21,520 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-12-09 06:34:21,520 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr7ASSERT_VIOLATIONMEMORY_FREE, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr8ASSERT_VIOLATIONMEMORY_FREE, ULTIMATE.startErr5REQUIRES_VIOLATION, ULTIMATE.startErr4REQUIRES_VIOLATION, ULTIMATE.startErr9ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr3REQUIRES_VIOLATION, ULTIMATE.startErr6ASSERT_VIOLATIONMEMORY_FREE, ULTIMATE.startErr2REQUIRES_VIOLATION]=== [2020-12-09 06:34:21,520 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 06:34:21,520 INFO L82 PathProgramCache]: Analyzing trace with hash 3079238, now seen corresponding path program 1 times [2020-12-09 06:34:21,520 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 06:34:21,521 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [946623011] [2020-12-09 06:34:21,521 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 06:34:21,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 06:34:21,569 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 06:34:21,569 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [946623011] [2020-12-09 06:34:21,569 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-09 06:34:21,570 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-12-09 06:34:21,570 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1622401935] [2020-12-09 06:34:21,570 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-12-09 06:34:21,570 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 06:34:21,570 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-12-09 06:34:21,571 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-12-09 06:34:21,571 INFO L87 Difference]: Start difference. First operand 19 states and 21 transitions. Second operand 5 states. [2020-12-09 06:34:21,615 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 06:34:21,615 INFO L93 Difference]: Finished difference Result 33 states and 35 transitions. [2020-12-09 06:34:21,616 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-12-09 06:34:21,616 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 4 [2020-12-09 06:34:21,616 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 06:34:21,616 INFO L225 Difference]: With dead ends: 33 [2020-12-09 06:34:21,616 INFO L226 Difference]: Without dead ends: 33 [2020-12-09 06:34:21,616 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-12-09 06:34:21,617 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-12-09 06:34:21,618 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 21. [2020-12-09 06:34:21,618 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-12-09 06:34:21,619 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 23 transitions. [2020-12-09 06:34:21,619 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 23 transitions. Word has length 4 [2020-12-09 06:34:21,619 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 06:34:21,619 INFO L481 AbstractCegarLoop]: Abstraction has 21 states and 23 transitions. [2020-12-09 06:34:21,619 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-12-09 06:34:21,619 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 23 transitions. [2020-12-09 06:34:21,619 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2020-12-09 06:34:21,619 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 06:34:21,619 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1] [2020-12-09 06:34:21,619 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-12-09 06:34:21,620 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr7ASSERT_VIOLATIONMEMORY_FREE, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr8ASSERT_VIOLATIONMEMORY_FREE, ULTIMATE.startErr5REQUIRES_VIOLATION, ULTIMATE.startErr4REQUIRES_VIOLATION, ULTIMATE.startErr9ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr3REQUIRES_VIOLATION, ULTIMATE.startErr6ASSERT_VIOLATIONMEMORY_FREE, ULTIMATE.startErr2REQUIRES_VIOLATION]=== [2020-12-09 06:34:21,620 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 06:34:21,620 INFO L82 PathProgramCache]: Analyzing trace with hash 93846041, now seen corresponding path program 1 times [2020-12-09 06:34:21,620 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 06:34:21,620 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [727563400] [2020-12-09 06:34:21,620 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 06:34:21,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 06:34:21,659 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 06:34:21,659 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [727563400] [2020-12-09 06:34:21,659 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [135983104] [2020-12-09 06:34:21,659 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_dbfac229-bc90-4acf-9af1-66e734163255/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 06:34:21,684 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 06:34:21,685 INFO L263 TraceCheckSpWp]: Trace formula consists of 39 conjuncts, 11 conjunts are in the unsatisfiable core [2020-12-09 06:34:21,688 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 06:34:21,726 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 06:34:21,727 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-09 06:34:21,732 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-09 06:34:21,733 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2020-12-09 06:34:21,734 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:13, output treesize:12 [2020-12-09 06:34:21,768 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 06:34:21,769 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 06:34:21,814 INFO L639 QuantifierPusher]: Distributing 2 disjuncts over 3 conjuncts [2020-12-09 06:34:21,845 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 06:34:21,846 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [517871576] [2020-12-09 06:34:21,865 INFO L159 IcfgInterpreter]: Started Sifa with 4 locations of interest [2020-12-09 06:34:21,865 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 06:34:21,868 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-09 06:34:21,872 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-09 06:34:21,872 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-09 06:34:22,197 INFO L180 IcfgInterpreter]: Interpretation finished [2020-12-09 06:34:22,412 WARN L197 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 70 DAG size of output: 59 [2020-12-09 06:34:22,471 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-12-09 06:34:22,471 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 06:34:22,471 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 7 [2020-12-09 06:34:22,471 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1977352113] [2020-12-09 06:34:22,472 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-12-09 06:34:22,472 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 06:34:22,472 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-12-09 06:34:22,473 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2020-12-09 06:34:22,473 INFO L87 Difference]: Start difference. First operand 21 states and 23 transitions. Second operand 9 states. [2020-12-09 06:34:22,563 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 06:34:22,563 INFO L93 Difference]: Finished difference Result 46 states and 49 transitions. [2020-12-09 06:34:22,563 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-12-09 06:34:22,563 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 5 [2020-12-09 06:34:22,564 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 06:34:22,564 INFO L225 Difference]: With dead ends: 46 [2020-12-09 06:34:22,564 INFO L226 Difference]: Without dead ends: 46 [2020-12-09 06:34:22,565 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 5 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=56, Invalid=154, Unknown=0, NotChecked=0, Total=210 [2020-12-09 06:34:22,565 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-12-09 06:34:22,567 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 19. [2020-12-09 06:34:22,567 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-12-09 06:34:22,568 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 21 transitions. [2020-12-09 06:34:22,568 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 21 transitions. Word has length 5 [2020-12-09 06:34:22,568 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 06:34:22,568 INFO L481 AbstractCegarLoop]: Abstraction has 19 states and 21 transitions. [2020-12-09 06:34:22,568 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-12-09 06:34:22,568 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 21 transitions. [2020-12-09 06:34:22,568 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2020-12-09 06:34:22,569 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 06:34:22,569 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2020-12-09 06:34:22,769 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2020-12-09 06:34:22,771 INFO L429 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr7ASSERT_VIOLATIONMEMORY_FREE, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr8ASSERT_VIOLATIONMEMORY_FREE, ULTIMATE.startErr5REQUIRES_VIOLATION, ULTIMATE.startErr4REQUIRES_VIOLATION, ULTIMATE.startErr9ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr3REQUIRES_VIOLATION, ULTIMATE.startErr6ASSERT_VIOLATIONMEMORY_FREE, ULTIMATE.startErr2REQUIRES_VIOLATION]=== [2020-12-09 06:34:22,772 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 06:34:22,772 INFO L82 PathProgramCache]: Analyzing trace with hash -1385686635, now seen corresponding path program 1 times [2020-12-09 06:34:22,772 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 06:34:22,773 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2138428518] [2020-12-09 06:34:22,773 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 06:34:22,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 06:34:22,934 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 06:34:22,934 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2138428518] [2020-12-09 06:34:22,935 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1736811804] [2020-12-09 06:34:22,935 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_dbfac229-bc90-4acf-9af1-66e734163255/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 06:34:22,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 06:34:22,977 INFO L263 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 28 conjunts are in the unsatisfiable core [2020-12-09 06:34:22,978 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 06:34:23,014 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 06:34:23,014 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 06:34:23,075 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 06:34:23,075 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1605660149] [2020-12-09 06:34:23,076 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2020-12-09 06:34:23,077 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 06:34:23,077 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-09 06:34:23,077 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-09 06:34:23,077 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-09 06:34:23,304 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 06:34:23,314 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 06:34:23,340 INFO L180 IcfgInterpreter]: Interpretation finished [2020-12-09 06:34:23,500 WARN L197 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 70 DAG size of output: 59 [2020-12-09 06:34:23,730 WARN L197 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 72 DAG size of output: 61 [2020-12-09 06:34:24,029 WARN L197 SmtUtils]: Spent 262.00 ms on a formula simplification. DAG size of input: 92 DAG size of output: 85 [2020-12-09 06:34:24,029 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 3 imperfect interpolant sequences. [2020-12-09 06:34:24,030 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [4, 3, 3] total 13 [2020-12-09 06:34:24,030 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [842817982] [2020-12-09 06:34:24,030 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-12-09 06:34:24,030 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 06:34:24,031 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-12-09 06:34:24,031 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=154, Unknown=0, NotChecked=0, Total=210 [2020-12-09 06:34:24,031 INFO L87 Difference]: Start difference. First operand 19 states and 21 transitions. Second operand 6 states. [2020-12-09 06:34:24,225 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 06:34:24,225 INFO L93 Difference]: Finished difference Result 26 states and 29 transitions. [2020-12-09 06:34:24,226 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-12-09 06:34:24,226 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 6 [2020-12-09 06:34:24,226 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 06:34:24,226 INFO L225 Difference]: With dead ends: 26 [2020-12-09 06:34:24,226 INFO L226 Difference]: Without dead ends: 26 [2020-12-09 06:34:24,226 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 5 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 58 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=63, Invalid=177, Unknown=0, NotChecked=0, Total=240 [2020-12-09 06:34:24,227 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-12-09 06:34:24,228 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 22. [2020-12-09 06:34:24,228 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-12-09 06:34:24,229 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 25 transitions. [2020-12-09 06:34:24,229 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 25 transitions. Word has length 6 [2020-12-09 06:34:24,229 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 06:34:24,229 INFO L481 AbstractCegarLoop]: Abstraction has 22 states and 25 transitions. [2020-12-09 06:34:24,229 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-12-09 06:34:24,229 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 25 transitions. [2020-12-09 06:34:24,230 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2020-12-09 06:34:24,230 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 06:34:24,230 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2020-12-09 06:34:24,431 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2020-12-09 06:34:24,432 INFO L429 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr7ASSERT_VIOLATIONMEMORY_FREE, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr8ASSERT_VIOLATIONMEMORY_FREE, ULTIMATE.startErr5REQUIRES_VIOLATION, ULTIMATE.startErr4REQUIRES_VIOLATION, ULTIMATE.startErr9ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr3REQUIRES_VIOLATION, ULTIMATE.startErr6ASSERT_VIOLATIONMEMORY_FREE, ULTIMATE.startErr2REQUIRES_VIOLATION]=== [2020-12-09 06:34:24,433 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 06:34:24,433 INFO L82 PathProgramCache]: Analyzing trace with hash -1335820097, now seen corresponding path program 1 times [2020-12-09 06:34:24,434 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 06:34:24,434 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [451384741] [2020-12-09 06:34:24,434 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 06:34:24,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 06:34:24,525 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 06:34:24,526 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [451384741] [2020-12-09 06:34:24,526 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-09 06:34:24,526 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-12-09 06:34:24,526 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [533289747] [2020-12-09 06:34:24,526 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-12-09 06:34:24,526 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 06:34:24,527 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-12-09 06:34:24,527 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-12-09 06:34:24,527 INFO L87 Difference]: Start difference. First operand 22 states and 25 transitions. Second operand 6 states. [2020-12-09 06:34:24,603 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 06:34:24,603 INFO L93 Difference]: Finished difference Result 34 states and 37 transitions. [2020-12-09 06:34:24,604 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-12-09 06:34:24,604 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 6 [2020-12-09 06:34:24,604 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 06:34:24,604 INFO L225 Difference]: With dead ends: 34 [2020-12-09 06:34:24,604 INFO L226 Difference]: Without dead ends: 34 [2020-12-09 06:34:24,604 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2020-12-09 06:34:24,605 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-12-09 06:34:24,606 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 26. [2020-12-09 06:34:24,606 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-12-09 06:34:24,606 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 30 transitions. [2020-12-09 06:34:24,607 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 30 transitions. Word has length 6 [2020-12-09 06:34:24,607 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 06:34:24,607 INFO L481 AbstractCegarLoop]: Abstraction has 26 states and 30 transitions. [2020-12-09 06:34:24,607 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-12-09 06:34:24,607 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 30 transitions. [2020-12-09 06:34:24,607 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2020-12-09 06:34:24,607 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 06:34:24,607 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2020-12-09 06:34:24,607 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51 [2020-12-09 06:34:24,607 INFO L429 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr7ASSERT_VIOLATIONMEMORY_FREE, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr8ASSERT_VIOLATIONMEMORY_FREE, ULTIMATE.startErr5REQUIRES_VIOLATION, ULTIMATE.startErr4REQUIRES_VIOLATION, ULTIMATE.startErr9ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr3REQUIRES_VIOLATION, ULTIMATE.startErr6ASSERT_VIOLATIONMEMORY_FREE, ULTIMATE.startErr2REQUIRES_VIOLATION]=== [2020-12-09 06:34:24,608 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 06:34:24,608 INFO L82 PathProgramCache]: Analyzing trace with hash -204994994, now seen corresponding path program 1 times [2020-12-09 06:34:24,608 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 06:34:24,608 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [296750747] [2020-12-09 06:34:24,608 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 06:34:24,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-12-09 06:34:24,621 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-12-09 06:34:24,632 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-12-09 06:34:24,632 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-12-09 06:34:24,643 INFO L173 FreeRefinementEngine]: Strategy SIFA_TAIPAN found a feasible trace [2020-12-09 06:34:24,643 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-12-09 06:34:24,643 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable52 [2020-12-09 06:34:24,658 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 09.12 06:34:24 BoogieIcfgContainer [2020-12-09 06:34:24,659 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-12-09 06:34:24,659 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-12-09 06:34:24,659 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-12-09 06:34:24,659 INFO L275 PluginConnector]: Witness Printer initialized [2020-12-09 06:34:24,659 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.12 06:34:21" (3/4) ... [2020-12-09 06:34:24,661 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2020-12-09 06:34:24,684 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/run_dir_dbfac229-bc90-4acf-9af1-66e734163255/bin/utaipan/witness.graphml [2020-12-09 06:34:24,684 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-12-09 06:34:24,684 INFO L168 Benchmark]: Toolchain (without parser) took 4320.69 ms. Allocated memory was 94.4 MB in the beginning and 163.6 MB in the end (delta: 69.2 MB). Free memory was 57.3 MB in the beginning and 111.1 MB in the end (delta: -53.8 MB). Peak memory consumption was 16.4 MB. Max. memory is 16.1 GB. [2020-12-09 06:34:24,685 INFO L168 Benchmark]: CDTParser took 0.16 ms. Allocated memory is still 94.4 MB. Free memory is still 74.8 MB. There was no memory consumed. Max. memory is 16.1 GB. [2020-12-09 06:34:24,685 INFO L168 Benchmark]: CACSL2BoogieTranslator took 273.86 ms. Allocated memory is still 94.4 MB. Free memory was 57.2 MB in the beginning and 60.1 MB in the end (delta: -3.0 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. [2020-12-09 06:34:24,685 INFO L168 Benchmark]: Boogie Procedure Inliner took 28.40 ms. Allocated memory is still 94.4 MB. Free memory was 60.1 MB in the beginning and 58.3 MB in the end (delta: 1.8 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-12-09 06:34:24,685 INFO L168 Benchmark]: Boogie Preprocessor took 18.12 ms. Allocated memory is still 94.4 MB. Free memory was 58.3 MB in the beginning and 57.1 MB in the end (delta: 1.3 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-12-09 06:34:24,686 INFO L168 Benchmark]: RCFGBuilder took 337.61 ms. Allocated memory is still 94.4 MB. Free memory was 57.1 MB in the beginning and 66.9 MB in the end (delta: -9.8 MB). Peak memory consumption was 23.1 MB. Max. memory is 16.1 GB. [2020-12-09 06:34:24,686 INFO L168 Benchmark]: TraceAbstraction took 3633.19 ms. Allocated memory was 94.4 MB in the beginning and 163.6 MB in the end (delta: 69.2 MB). Free memory was 66.9 MB in the beginning and 112.2 MB in the end (delta: -45.3 MB). Peak memory consumption was 22.8 MB. Max. memory is 16.1 GB. [2020-12-09 06:34:24,686 INFO L168 Benchmark]: Witness Printer took 24.74 ms. Allocated memory is still 163.6 MB. Free memory was 112.2 MB in the beginning and 111.1 MB in the end (delta: 1.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-12-09 06:34:24,688 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.16 ms. Allocated memory is still 94.4 MB. Free memory is still 74.8 MB. There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 273.86 ms. Allocated memory is still 94.4 MB. Free memory was 57.2 MB in the beginning and 60.1 MB in the end (delta: -3.0 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 28.40 ms. Allocated memory is still 94.4 MB. Free memory was 60.1 MB in the beginning and 58.3 MB in the end (delta: 1.8 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Boogie Preprocessor took 18.12 ms. Allocated memory is still 94.4 MB. Free memory was 58.3 MB in the beginning and 57.1 MB in the end (delta: 1.3 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * RCFGBuilder took 337.61 ms. Allocated memory is still 94.4 MB. Free memory was 57.1 MB in the beginning and 66.9 MB in the end (delta: -9.8 MB). Peak memory consumption was 23.1 MB. Max. memory is 16.1 GB. * TraceAbstraction took 3633.19 ms. Allocated memory was 94.4 MB in the beginning and 163.6 MB in the end (delta: 69.2 MB). Free memory was 66.9 MB in the beginning and 112.2 MB in the end (delta: -45.3 MB). Peak memory consumption was 22.8 MB. Max. memory is 16.1 GB. * Witness Printer took 24.74 ms. Allocated memory is still 163.6 MB. Free memory was 112.2 MB in the beginning and 111.1 MB in the end (delta: 1.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 532]: pointer dereference may fail pointer dereference may fail We found a FailurePath: [L515] int length = __VERIFIER_nondet_int(); [L516] COND FALSE !(length < 1) [L519] char* nondetString = (char*) malloc(length * sizeof(char)); [L521] int i = 0; [L521] COND TRUE i < length - 1 [L523] nondetString[i] = __VERIFIER_nondet_char() [L521] i++ [L521] COND FALSE !(i < length - 1) [L526] nondetString[length-1] = '\0' [L527] return nondetString; [L537] char* p = build_nondet_String(); [L531] const char *p = s; [L532] EXPR \read(*p) [L532] COND TRUE *p != '\0' [L533] p = p+2 [L532] \read(*p) - StatisticsResult: Ultimate Automizer benchmark data CFG has 1 procedures, 22 locations, 10 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 3.5s, OverallIterations: 9, TraceHistogramMax: 2, AutomataDifference: 0.5s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 108 SDtfs, 257 SDslu, 161 SDs, 0 SdLazy, 211 SolverSat, 20 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.1s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 60 GetRequests, 12 SyntacticMatches, 3 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 77 ImplicationChecksByTransitivity, 1.4s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=26occurred in iteration=8, 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, 8 MinimizatonAttempts, 66 StatesRemovedByMinimization, 5 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 0.6s InterpolantComputationTime, 53 NumberOfCodeBlocks, 53 NumberOfCodeBlocksAsserted, 11 NumberOfCheckSat, 44 ConstructedInterpolants, 0 QuantifiedInterpolants, 1828 SizeOfPredicates, 19 NumberOfNonLiveVariables, 101 ConjunctsInSsa, 39 ConjunctsInUnsatCore, 12 InterpolantComputations, 6 PerfectInterpolantSequences, 2/10 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: OVERALL_TIME[ms]: 264, ICFG_INTERPRETER_ENTERED_PROCEDURES: 1, DAG_INTERPRETER_EARLY_EXIT_QUERIES_NONTRIVIAL: 6, DAG_INTERPRETER_EARLY_EXITS: 0, TOOLS_POST_APPLICATIONS: 12, TOOLS_POST_TIME[ms]: 183, TOOLS_POST_CALL_APPLICATIONS: 0, TOOLS_POST_CALL_TIME[ms]: 0, TOOLS_POST_RETURN_APPLICATIONS: 0, TOOLS_POST_RETURN_TIME[ms]: 0, TOOLS_QUANTIFIERELIM_APPLICATIONS: 12, TOOLS_QUANTIFIERELIM_TIME[ms]: 180, TOOLS_QUANTIFIERELIM_MAX_TIME[ms]: 74, FLUID_QUERY_TIME[ms]: 0, FLUID_QUERIES: 26, FLUID_YES_ANSWERS: 0, DOMAIN_JOIN_APPLICATIONS: 2, DOMAIN_JOIN_TIME[ms]: 30, DOMAIN_ALPHA_APPLICATIONS: 0, DOMAIN_ALPHA_TIME[ms]: 0, DOMAIN_WIDEN_APPLICATIONS: 2, DOMAIN_WIDEN_TIME[ms]: 34, DOMAIN_ISSUBSETEQ_APPLICATIONS: 3, DOMAIN_ISSUBSETEQ_TIME[ms]: 5, DOMAIN_ISBOTTOM_APPLICATIONS: 6, DOMAIN_ISBOTTOM_TIME[ms]: 7, LOOP_SUMMARIZER_APPLICATIONS: 1, LOOP_SUMMARIZER_CACHE_MISSES: 1, LOOP_SUMMARIZER_OVERALL_TIME[ms]: 109, LOOP_SUMMARIZER_NEW_COMPUTATION_TIME[ms]: 109, LOOP_SUMMARIZER_FIXPOINT_ITERATIONS: 3, CALL_SUMMARIZER_APPLICATIONS: 0, CALL_SUMMARIZER_CACHE_MISSES: 0, CALL_SUMMARIZER_OVERALL_TIME[ms]: 0, CALL_SUMMARIZER_NEW_COMPUTATION_TIME[ms]: 0, PROCEDURE_GRAPH_BUILDER_TIME[ms]: 0, PATH_EXPR_TIME[ms]: 0, REGEX_TO_DAG_TIME[ms]: 0, DAG_COMPRESSION_TIME[ms]: 2, DAG_COMPRESSION_PROCESSED_NODES: 51, DAG_COMPRESSION_RETAINED_NODES: 20, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...