./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loops/invert_string-1.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version a4ecdabc Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/run_dir_c876b157-2b63-47b3-8cb2-dbe56c6dd481/bin/utaipan/data/config -Xmx15G -Xms4m -jar /tmp/vcloud-vcloud-master/worker/run_dir_c876b157-2b63-47b3-8cb2-dbe56c6dd481/bin/utaipan/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_c876b157-2b63-47b3-8cb2-dbe56c6dd481/bin/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_c876b157-2b63-47b3-8cb2-dbe56c6dd481/bin/utaipan/config/TaipanReach.xml -i ../../sv-benchmarks/c/loops/invert_string-1.c -s /tmp/vcloud-vcloud-master/worker/run_dir_c876b157-2b63-47b3-8cb2-dbe56c6dd481/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_c876b157-2b63-47b3-8cb2-dbe56c6dd481/bin/utaipan --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 1b9a71645175fee79e6d6cd797db38ce6044ffb9 ......................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... Execution finished normally Writing output log to file Ultimate.log Writing human readable error path to file UltimateCounterExample.errorpath Result: FALSE --- Real Ultimate output --- This is Ultimate 0.2.0-a4ecdab [2020-11-28 07:43:44,736 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-11-28 07:43:44,739 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-11-28 07:43:44,776 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-11-28 07:43:44,777 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-11-28 07:43:44,779 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-11-28 07:43:44,782 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-11-28 07:43:44,785 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-11-28 07:43:44,788 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-11-28 07:43:44,790 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-11-28 07:43:44,791 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-11-28 07:43:44,793 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-11-28 07:43:44,794 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-11-28 07:43:44,796 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-11-28 07:43:44,798 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-11-28 07:43:44,800 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-11-28 07:43:44,802 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-11-28 07:43:44,803 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-11-28 07:43:44,806 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-11-28 07:43:44,809 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-11-28 07:43:44,812 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-11-28 07:43:44,816 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-11-28 07:43:44,818 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-11-28 07:43:44,819 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-11-28 07:43:44,824 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-11-28 07:43:44,824 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-11-28 07:43:44,825 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-11-28 07:43:44,826 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-11-28 07:43:44,827 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-11-28 07:43:44,828 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-11-28 07:43:44,829 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-11-28 07:43:44,830 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-11-28 07:43:44,831 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-11-28 07:43:44,832 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-11-28 07:43:44,834 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-11-28 07:43:44,835 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-11-28 07:43:44,836 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-11-28 07:43:44,836 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-11-28 07:43:44,837 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-11-28 07:43:44,838 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-11-28 07:43:44,839 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-11-28 07:43:44,841 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/run_dir_c876b157-2b63-47b3-8cb2-dbe56c6dd481/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf [2020-11-28 07:43:44,868 INFO L113 SettingsManager]: Loading preferences was successful [2020-11-28 07:43:44,868 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-11-28 07:43:44,869 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2020-11-28 07:43:44,869 INFO L138 SettingsManager]: * User list type=DISABLED [2020-11-28 07:43:44,870 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2020-11-28 07:43:44,870 INFO L138 SettingsManager]: * Explicit value domain=true [2020-11-28 07:43:44,870 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2020-11-28 07:43:44,870 INFO L138 SettingsManager]: * Octagon Domain=false [2020-11-28 07:43:44,871 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2020-11-28 07:43:44,871 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2020-11-28 07:43:44,871 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2020-11-28 07:43:44,871 INFO L138 SettingsManager]: * Interval Domain=false [2020-11-28 07:43:44,872 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2020-11-28 07:43:44,872 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2020-11-28 07:43:44,872 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2020-11-28 07:43:44,873 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-11-28 07:43:44,873 INFO L138 SettingsManager]: * sizeof long=4 [2020-11-28 07:43:44,874 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-11-28 07:43:44,874 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-11-28 07:43:44,874 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-11-28 07:43:44,874 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-11-28 07:43:44,875 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-11-28 07:43:44,875 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-11-28 07:43:44,875 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2020-11-28 07:43:44,875 INFO L138 SettingsManager]: * sizeof long double=12 [2020-11-28 07:43:44,876 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-11-28 07:43:44,876 INFO L138 SettingsManager]: * Use constant arrays=true [2020-11-28 07:43:44,876 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-11-28 07:43:44,876 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-11-28 07:43:44,877 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-11-28 07:43:44,877 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-11-28 07:43:44,877 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-11-28 07:43:44,877 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-11-28 07:43:44,878 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-11-28 07:43:44,878 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-11-28 07:43:44,878 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2020-11-28 07:43:44,878 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-11-28 07:43:44,879 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-11-28 07:43:44,879 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-11-28 07:43:44,879 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2020-11-28 07:43:44,879 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_c876b157-2b63-47b3-8cb2-dbe56c6dd481/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud-vcloud-master/worker/run_dir_c876b157-2b63-47b3-8cb2-dbe56c6dd481/bin/utaipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 1b9a71645175fee79e6d6cd797db38ce6044ffb9 [2020-11-28 07:43:45,206 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-11-28 07:43:45,242 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-11-28 07:43:45,245 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-11-28 07:43:45,246 INFO L271 PluginConnector]: Initializing CDTParser... [2020-11-28 07:43:45,249 INFO L275 PluginConnector]: CDTParser initialized [2020-11-28 07:43:45,250 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_c876b157-2b63-47b3-8cb2-dbe56c6dd481/bin/utaipan/../../sv-benchmarks/c/loops/invert_string-1.c [2020-11-28 07:43:45,316 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_c876b157-2b63-47b3-8cb2-dbe56c6dd481/bin/utaipan/data/442e41830/fdad34937ffb4c17973f429c61b327e9/FLAG3bd37f0c5 [2020-11-28 07:43:45,790 INFO L306 CDTParser]: Found 1 translation units. [2020-11-28 07:43:45,790 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_c876b157-2b63-47b3-8cb2-dbe56c6dd481/sv-benchmarks/c/loops/invert_string-1.c [2020-11-28 07:43:45,796 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_c876b157-2b63-47b3-8cb2-dbe56c6dd481/bin/utaipan/data/442e41830/fdad34937ffb4c17973f429c61b327e9/FLAG3bd37f0c5 [2020-11-28 07:43:46,168 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_c876b157-2b63-47b3-8cb2-dbe56c6dd481/bin/utaipan/data/442e41830/fdad34937ffb4c17973f429c61b327e9 [2020-11-28 07:43:46,172 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-11-28 07:43:46,173 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-11-28 07:43:46,178 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-11-28 07:43:46,178 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-11-28 07:43:46,182 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-11-28 07:43:46,183 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 28.11 07:43:46" (1/1) ... [2020-11-28 07:43:46,185 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@43da585b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:43:46, skipping insertion in model container [2020-11-28 07:43:46,185 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 28.11 07:43:46" (1/1) ... [2020-11-28 07:43:46,194 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-11-28 07:43:46,212 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-11-28 07:43:46,422 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-28 07:43:46,430 INFO L203 MainTranslator]: Completed pre-run [2020-11-28 07:43:46,462 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-28 07:43:46,477 INFO L208 MainTranslator]: Completed translation [2020-11-28 07:43:46,479 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:43:46 WrapperNode [2020-11-28 07:43:46,479 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-11-28 07:43:46,480 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-11-28 07:43:46,481 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-11-28 07:43:46,481 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-11-28 07:43:46,488 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:43:46" (1/1) ... [2020-11-28 07:43:46,497 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:43:46" (1/1) ... [2020-11-28 07:43:46,523 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-11-28 07:43:46,525 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-11-28 07:43:46,525 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-11-28 07:43:46,525 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-11-28 07:43:46,534 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:43:46" (1/1) ... [2020-11-28 07:43:46,534 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:43:46" (1/1) ... [2020-11-28 07:43:46,546 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:43:46" (1/1) ... [2020-11-28 07:43:46,546 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:43:46" (1/1) ... [2020-11-28 07:43:46,551 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:43:46" (1/1) ... [2020-11-28 07:43:46,557 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:43:46" (1/1) ... [2020-11-28 07:43:46,568 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:43:46" (1/1) ... [2020-11-28 07:43:46,570 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-11-28 07:43:46,571 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-11-28 07:43:46,571 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-11-28 07:43:46,571 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-11-28 07:43:46,573 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:43:46" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_c876b157-2b63-47b3-8cb2-dbe56c6dd481/bin/utaipan/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-11-28 07:43:46,647 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-11-28 07:43:46,648 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-11-28 07:43:46,648 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-11-28 07:43:46,648 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-11-28 07:43:46,648 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-11-28 07:43:46,648 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-11-28 07:43:46,648 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-11-28 07:43:47,221 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-11-28 07:43:47,222 INFO L298 CfgBuilder]: Removed 11 assume(true) statements. [2020-11-28 07:43:47,224 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.11 07:43:47 BoogieIcfgContainer [2020-11-28 07:43:47,224 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-11-28 07:43:47,226 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-11-28 07:43:47,226 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-11-28 07:43:47,231 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-11-28 07:43:47,231 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 28.11 07:43:46" (1/3) ... [2020-11-28 07:43:47,232 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@440209db and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 28.11 07:43:47, skipping insertion in model container [2020-11-28 07:43:47,232 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:43:46" (2/3) ... [2020-11-28 07:43:47,232 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@440209db and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 28.11 07:43:47, skipping insertion in model container [2020-11-28 07:43:47,232 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.11 07:43:47" (3/3) ... [2020-11-28 07:43:47,234 INFO L111 eAbstractionObserver]: Analyzing ICFG invert_string-1.c [2020-11-28 07:43:47,245 INFO L164 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-11-28 07:43:47,252 INFO L176 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-11-28 07:43:47,267 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-11-28 07:43:47,302 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-11-28 07:43:47,302 INFO L378 AbstractCegarLoop]: Hoare is true [2020-11-28 07:43:47,302 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-11-28 07:43:47,303 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-11-28 07:43:47,303 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-11-28 07:43:47,303 INFO L382 AbstractCegarLoop]: Difference is false [2020-11-28 07:43:47,303 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-11-28 07:43:47,303 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-11-28 07:43:47,314 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states. [2020-11-28 07:43:47,319 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2020-11-28 07:43:47,319 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 07:43:47,320 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2020-11-28 07:43:47,320 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-28 07:43:47,328 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 07:43:47,328 INFO L82 PathProgramCache]: Analyzing trace with hash -1009541242, now seen corresponding path program 1 times [2020-11-28 07:43:47,337 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-28 07:43:47,339 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [876981963] [2020-11-28 07:43:47,339 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 07:43:47,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 07:43:47,509 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 07:43:47,509 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [876981963] [2020-11-28 07:43:47,510 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-28 07:43:47,510 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-11-28 07:43:47,511 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [758291462] [2020-11-28 07:43:47,516 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-11-28 07:43:47,516 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-28 07:43:47,533 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-11-28 07:43:47,534 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-11-28 07:43:47,536 INFO L87 Difference]: Start difference. First operand 9 states. Second operand 3 states. [2020-11-28 07:43:47,579 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 07:43:47,579 INFO L93 Difference]: Finished difference Result 17 states and 23 transitions. [2020-11-28 07:43:47,580 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-11-28 07:43:47,581 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 6 [2020-11-28 07:43:47,582 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-28 07:43:47,588 INFO L225 Difference]: With dead ends: 17 [2020-11-28 07:43:47,589 INFO L226 Difference]: Without dead ends: 9 [2020-11-28 07:43:47,591 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-11-28 07:43:47,608 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2020-11-28 07:43:47,619 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 9. [2020-11-28 07:43:47,620 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 9 states. [2020-11-28 07:43:47,621 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 11 transitions. [2020-11-28 07:43:47,622 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 11 transitions. Word has length 6 [2020-11-28 07:43:47,622 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-28 07:43:47,622 INFO L481 AbstractCegarLoop]: Abstraction has 9 states and 11 transitions. [2020-11-28 07:43:47,623 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-11-28 07:43:47,623 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 11 transitions. [2020-11-28 07:43:47,623 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2020-11-28 07:43:47,623 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 07:43:47,624 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2020-11-28 07:43:47,624 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-11-28 07:43:47,624 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-28 07:43:47,625 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 07:43:47,625 INFO L82 PathProgramCache]: Analyzing trace with hash -1481284516, now seen corresponding path program 1 times [2020-11-28 07:43:47,625 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-28 07:43:47,626 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [454902010] [2020-11-28 07:43:47,626 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 07:43:47,677 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 07:43:47,711 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-11-28 07:43:47,712 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [454902010] [2020-11-28 07:43:47,712 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-28 07:43:47,712 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-11-28 07:43:47,712 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1930301104] [2020-11-28 07:43:47,713 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-11-28 07:43:47,714 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-28 07:43:47,714 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-11-28 07:43:47,715 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-11-28 07:43:47,715 INFO L87 Difference]: Start difference. First operand 9 states and 11 transitions. Second operand 4 states. [2020-11-28 07:43:47,755 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 07:43:47,755 INFO L93 Difference]: Finished difference Result 15 states and 18 transitions. [2020-11-28 07:43:47,756 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-11-28 07:43:47,756 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 7 [2020-11-28 07:43:47,756 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-28 07:43:47,756 INFO L225 Difference]: With dead ends: 15 [2020-11-28 07:43:47,757 INFO L226 Difference]: Without dead ends: 10 [2020-11-28 07:43:47,757 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-11-28 07:43:47,758 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10 states. [2020-11-28 07:43:47,760 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10 to 10. [2020-11-28 07:43:47,760 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 10 states. [2020-11-28 07:43:47,761 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 12 transitions. [2020-11-28 07:43:47,761 INFO L78 Accepts]: Start accepts. Automaton has 10 states and 12 transitions. Word has length 7 [2020-11-28 07:43:47,761 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-28 07:43:47,761 INFO L481 AbstractCegarLoop]: Abstraction has 10 states and 12 transitions. [2020-11-28 07:43:47,762 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-11-28 07:43:47,762 INFO L276 IsEmpty]: Start isEmpty. Operand 10 states and 12 transitions. [2020-11-28 07:43:47,762 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2020-11-28 07:43:47,762 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 07:43:47,762 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2020-11-28 07:43:47,763 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-11-28 07:43:47,763 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-28 07:43:47,763 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 07:43:47,763 INFO L82 PathProgramCache]: Analyzing trace with hash 1320199760, now seen corresponding path program 1 times [2020-11-28 07:43:47,764 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-28 07:43:47,764 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1945393285] [2020-11-28 07:43:47,764 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 07:43:47,835 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 07:43:48,188 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 07:43:48,189 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1945393285] [2020-11-28 07:43:48,189 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [637143632] [2020-11-28 07:43:48,189 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_c876b157-2b63-47b3-8cb2-dbe56c6dd481/bin/utaipan/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-28 07:43:48,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 07:43:48,257 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 19 conjunts are in the unsatisfiable core [2020-11-28 07:43:48,262 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 07:43:48,330 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 238 treesize of output 222 [2020-11-28 07:43:48,340 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 2 xjuncts. [2020-11-28 07:43:48,415 INFO L625 ElimStorePlain]: treesize reduction 172, result has 11.8 percent of original size [2020-11-28 07:43:48,423 INFO L545 ElimStorePlain]: Start of recursive call 1: 3 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2020-11-28 07:43:48,423 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 4 variables, input treesize:27, output treesize:11 [2020-11-28 07:43:48,513 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 15 [2020-11-28 07:43:48,514 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-11-28 07:43:48,523 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-11-28 07:43:48,523 INFO L545 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-11-28 07:43:48,523 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:26, output treesize:22 [2020-11-28 07:43:48,630 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-28 07:43:48,648 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-28 07:43:48,657 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-28 07:43:48,665 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-28 07:43:48,679 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-28 07:43:48,686 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-28 07:43:48,695 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-28 07:43:48,702 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-28 07:43:48,774 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 07:43:48,774 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-28 07:43:48,797 INFO L603 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-11-28 07:43:48,865 INFO L350 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2020-11-28 07:43:48,866 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 26 [2020-11-28 07:43:48,867 INFO L603 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-11-28 07:43:48,869 INFO L441 ElimStorePlain]: Different costs {0=[v_arrayElimCell_4], 1=[v_arrayElimCell_3]} [2020-11-28 07:43:48,877 WARN L838 $PredicateComparison]: unable to prove that (forall ((|#memory_int| (Array Int (Array Int Int))) (|ULTIMATE.start_main_~#str1~0.offset| Int) (|ULTIMATE.start_main_~#str2~0.offset| Int)) (let ((.cse0 (store (select |#memory_int| |c_ULTIMATE.start_main_~#str2~0.base|) (+ |ULTIMATE.start_main_~#str2~0.offset| c_ULTIMATE.start_main_~j~0) (select (select |#memory_int| |c_ULTIMATE.start_main_~#str1~0.base|) |ULTIMATE.start_main_~#str1~0.offset|)))) (= (select (select (store |#memory_int| |c_ULTIMATE.start_main_~#str2~0.base| .cse0) |c_ULTIMATE.start_main_~#str1~0.base|) |ULTIMATE.start_main_~#str1~0.offset|) (select .cse0 (+ c_ULTIMATE.start_main_~MAX~0 |ULTIMATE.start_main_~#str2~0.offset| (- 1)))))) is different from false [2020-11-28 07:43:48,921 INFO L350 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2020-11-28 07:43:48,921 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 21 treesize of output 24 [2020-11-28 07:43:48,922 INFO L603 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-11-28 07:43:48,926 INFO L441 ElimStorePlain]: Different costs {0=[v_arrayElimCell_6], 1=[v_arrayElimCell_5]} [2020-11-28 07:43:48,998 INFO L350 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2020-11-28 07:43:48,999 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 21 treesize of output 24 [2020-11-28 07:43:49,000 INFO L603 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-11-28 07:43:49,003 INFO L441 ElimStorePlain]: Different costs {0=[v_arrayElimCell_8], 1=[v_arrayElimCell_7]} [2020-11-28 07:43:49,056 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 1 not checked. [2020-11-28 07:43:49,057 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2044423103] [2020-11-28 07:43:49,081 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2020-11-28 07:43:49,081 INFO L166 IcfgInterpreter]: Building call graph [2020-11-28 07:43:49,088 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-11-28 07:43:49,094 INFO L176 IcfgInterpreter]: Starting interpretation [2020-11-28 07:43:49,095 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-11-28 07:43:49,235 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-11-28 07:43:49,585 WARN L193 SmtUtils]: Spent 189.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 49 [2020-11-28 07:43:50,137 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 159 [2020-11-28 07:43:50,492 INFO L180 IcfgInterpreter]: Interpretation finished [2020-11-28 07:43:50,790 WARN L193 SmtUtils]: Spent 244.00 ms on a formula simplification. DAG size of input: 75 DAG size of output: 59 [2020-11-28 07:43:51,004 WARN L193 SmtUtils]: Spent 156.00 ms on a formula simplification. DAG size of input: 52 DAG size of output: 37 [2020-11-28 07:43:51,217 WARN L193 SmtUtils]: Spent 173.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 43 [2020-11-28 07:43:51,446 WARN L193 SmtUtils]: Spent 176.00 ms on a formula simplification. DAG size of input: 56 DAG size of output: 41 [2020-11-28 07:43:51,735 WARN L193 SmtUtils]: Spent 225.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 58 [2020-11-28 07:43:51,737 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-11-28 07:43:51,737 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-28 07:43:51,738 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 18 [2020-11-28 07:43:51,738 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1105122132] [2020-11-28 07:43:51,738 INFO L461 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-11-28 07:43:51,739 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-28 07:43:51,739 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-11-28 07:43:51,740 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=426, Unknown=1, NotChecked=42, Total=552 [2020-11-28 07:43:51,741 INFO L87 Difference]: Start difference. First operand 10 states and 12 transitions. Second operand 19 states. [2020-11-28 07:43:52,487 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 07:43:52,487 INFO L93 Difference]: Finished difference Result 25 states and 29 transitions. [2020-11-28 07:43:52,488 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-11-28 07:43:52,488 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 8 [2020-11-28 07:43:52,488 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-28 07:43:52,489 INFO L225 Difference]: With dead ends: 25 [2020-11-28 07:43:52,489 INFO L226 Difference]: Without dead ends: 23 [2020-11-28 07:43:52,490 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 6 SyntacticMatches, 1 SemanticMatches, 30 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 131 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=190, Invalid=743, Unknown=1, NotChecked=58, Total=992 [2020-11-28 07:43:52,490 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-11-28 07:43:52,494 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 15. [2020-11-28 07:43:52,494 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-11-28 07:43:52,495 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 19 transitions. [2020-11-28 07:43:52,495 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 19 transitions. Word has length 8 [2020-11-28 07:43:52,495 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-28 07:43:52,496 INFO L481 AbstractCegarLoop]: Abstraction has 15 states and 19 transitions. [2020-11-28 07:43:52,496 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-11-28 07:43:52,496 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 19 transitions. [2020-11-28 07:43:52,496 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2020-11-28 07:43:52,496 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 07:43:52,497 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1] [2020-11-28 07:43:52,711 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2020-11-28 07:43:52,711 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-28 07:43:52,711 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 07:43:52,711 INFO L82 PathProgramCache]: Analyzing trace with hash -1053520474, now seen corresponding path program 2 times [2020-11-28 07:43:52,711 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-28 07:43:52,712 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1826186824] [2020-11-28 07:43:52,712 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 07:43:52,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 07:43:52,806 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 07:43:52,806 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1826186824] [2020-11-28 07:43:52,806 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2023110920] [2020-11-28 07:43:52,806 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_c876b157-2b63-47b3-8cb2-dbe56c6dd481/bin/utaipan/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-28 07:43:52,856 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2020-11-28 07:43:52,856 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-28 07:43:52,857 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 6 conjunts are in the unsatisfiable core [2020-11-28 07:43:52,859 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 07:43:52,874 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 07:43:52,874 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-28 07:43:52,884 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 07:43:52,884 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1917626691] [2020-11-28 07:43:52,888 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2020-11-28 07:43:52,888 INFO L166 IcfgInterpreter]: Building call graph [2020-11-28 07:43:52,889 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-11-28 07:43:52,889 INFO L176 IcfgInterpreter]: Starting interpretation [2020-11-28 07:43:52,889 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-11-28 07:43:52,934 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-11-28 07:43:53,200 WARN L193 SmtUtils]: Spent 159.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 49 [2020-11-28 07:43:53,929 INFO L180 IcfgInterpreter]: Interpretation finished [2020-11-28 07:43:54,193 WARN L193 SmtUtils]: Spent 241.00 ms on a formula simplification. DAG size of input: 75 DAG size of output: 59 [2020-11-28 07:43:54,373 WARN L193 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 52 DAG size of output: 37 [2020-11-28 07:43:54,577 WARN L193 SmtUtils]: Spent 187.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 43 [2020-11-28 07:43:54,761 WARN L193 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 56 DAG size of output: 41 [2020-11-28 07:43:54,964 WARN L193 SmtUtils]: Spent 179.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 58 [2020-11-28 07:43:54,965 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-11-28 07:43:54,965 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-28 07:43:54,965 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 4 [2020-11-28 07:43:54,965 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1172854510] [2020-11-28 07:43:54,966 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-11-28 07:43:54,966 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-28 07:43:54,966 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-11-28 07:43:54,967 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2020-11-28 07:43:54,967 INFO L87 Difference]: Start difference. First operand 15 states and 19 transitions. Second operand 5 states. [2020-11-28 07:43:55,073 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 07:43:55,074 INFO L93 Difference]: Finished difference Result 28 states and 33 transitions. [2020-11-28 07:43:55,074 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-11-28 07:43:55,074 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 9 [2020-11-28 07:43:55,074 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-28 07:43:55,075 INFO L225 Difference]: With dead ends: 28 [2020-11-28 07:43:55,075 INFO L226 Difference]: Without dead ends: 23 [2020-11-28 07:43:55,075 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 22 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=40, Invalid=92, Unknown=0, NotChecked=0, Total=132 [2020-11-28 07:43:55,076 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-11-28 07:43:55,079 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 16. [2020-11-28 07:43:55,080 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-11-28 07:43:55,080 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 20 transitions. [2020-11-28 07:43:55,080 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 20 transitions. Word has length 9 [2020-11-28 07:43:55,080 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-28 07:43:55,081 INFO L481 AbstractCegarLoop]: Abstraction has 16 states and 20 transitions. [2020-11-28 07:43:55,081 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-11-28 07:43:55,081 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 20 transitions. [2020-11-28 07:43:55,081 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-11-28 07:43:55,081 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 07:43:55,081 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1] [2020-11-28 07:43:55,291 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable33 [2020-11-28 07:43:55,291 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-28 07:43:55,291 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 07:43:55,291 INFO L82 PathProgramCache]: Analyzing trace with hash 1695983174, now seen corresponding path program 3 times [2020-11-28 07:43:55,292 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-28 07:43:55,292 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [411640756] [2020-11-28 07:43:55,292 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 07:43:55,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 07:43:55,640 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 07:43:55,641 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [411640756] [2020-11-28 07:43:55,641 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1770015713] [2020-11-28 07:43:55,641 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_c876b157-2b63-47b3-8cb2-dbe56c6dd481/bin/utaipan/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-28 07:43:55,683 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-11-28 07:43:55,684 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-28 07:43:55,685 WARN L261 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 24 conjunts are in the unsatisfiable core [2020-11-28 07:43:55,687 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 07:43:56,026 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-11-28 07:43:56,026 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-28 07:43:56,290 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-11-28 07:43:56,291 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [580578950] [2020-11-28 07:43:56,293 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2020-11-28 07:43:56,293 INFO L166 IcfgInterpreter]: Building call graph [2020-11-28 07:43:56,294 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-11-28 07:43:56,294 INFO L176 IcfgInterpreter]: Starting interpretation [2020-11-28 07:43:56,294 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-11-28 07:43:56,383 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-11-28 07:43:56,618 WARN L193 SmtUtils]: Spent 154.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 49 [2020-11-28 07:43:57,369 INFO L180 IcfgInterpreter]: Interpretation finished [2020-11-28 07:43:57,672 WARN L193 SmtUtils]: Spent 225.00 ms on a formula simplification. DAG size of input: 75 DAG size of output: 59 [2020-11-28 07:43:57,862 WARN L193 SmtUtils]: Spent 153.00 ms on a formula simplification. DAG size of input: 52 DAG size of output: 37 [2020-11-28 07:43:58,060 WARN L193 SmtUtils]: Spent 160.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 43 [2020-11-28 07:43:58,369 WARN L193 SmtUtils]: Spent 190.00 ms on a formula simplification. DAG size of input: 56 DAG size of output: 41 [2020-11-28 07:43:58,678 WARN L193 SmtUtils]: Spent 227.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 58 [2020-11-28 07:43:58,679 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-11-28 07:43:58,679 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-28 07:43:58,680 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 7, 7] total 19 [2020-11-28 07:43:58,680 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2130003565] [2020-11-28 07:43:58,680 INFO L461 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-11-28 07:43:58,680 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-28 07:43:58,681 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-11-28 07:43:58,681 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=468, Unknown=0, NotChecked=0, Total=552 [2020-11-28 07:43:58,682 INFO L87 Difference]: Start difference. First operand 16 states and 20 transitions. Second operand 19 states. [2020-11-28 07:43:58,916 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 48 DAG size of output: 47 [2020-11-28 07:43:59,898 WARN L193 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 48 DAG size of output: 47 [2020-11-28 07:44:00,683 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 42 DAG size of output: 41 [2020-11-28 07:44:01,264 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 45 DAG size of output: 44 [2020-11-28 07:44:01,718 WARN L193 SmtUtils]: Spent 246.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 49 [2020-11-28 07:44:02,308 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 07:44:02,308 INFO L93 Difference]: Finished difference Result 80 states and 97 transitions. [2020-11-28 07:44:02,309 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-11-28 07:44:02,309 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 10 [2020-11-28 07:44:02,309 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-28 07:44:02,310 INFO L225 Difference]: With dead ends: 80 [2020-11-28 07:44:02,310 INFO L226 Difference]: Without dead ends: 78 [2020-11-28 07:44:02,313 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 505 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=529, Invalid=2332, Unknown=1, NotChecked=0, Total=2862 [2020-11-28 07:44:02,314 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-11-28 07:44:02,324 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 21. [2020-11-28 07:44:02,324 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-11-28 07:44:02,325 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 29 transitions. [2020-11-28 07:44:02,325 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 29 transitions. Word has length 10 [2020-11-28 07:44:02,325 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-28 07:44:02,326 INFO L481 AbstractCegarLoop]: Abstraction has 21 states and 29 transitions. [2020-11-28 07:44:02,326 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-11-28 07:44:02,326 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 29 transitions. [2020-11-28 07:44:02,326 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-11-28 07:44:02,327 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 07:44:02,327 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-28 07:44:02,535 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable64 [2020-11-28 07:44:02,535 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-28 07:44:02,535 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 07:44:02,536 INFO L82 PathProgramCache]: Analyzing trace with hash 1062655729, now seen corresponding path program 1 times [2020-11-28 07:44:02,536 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-28 07:44:02,536 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [737096855] [2020-11-28 07:44:02,536 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 07:44:02,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 07:44:02,608 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-11-28 07:44:02,608 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [737096855] [2020-11-28 07:44:02,608 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1276385431] [2020-11-28 07:44:02,608 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_c876b157-2b63-47b3-8cb2-dbe56c6dd481/bin/utaipan/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-28 07:44:02,671 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 07:44:02,672 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 6 conjunts are in the unsatisfiable core [2020-11-28 07:44:02,674 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 07:44:02,713 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-11-28 07:44:02,713 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-28 07:44:02,729 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-11-28 07:44:02,729 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2110149308] [2020-11-28 07:44:02,731 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2020-11-28 07:44:02,732 INFO L166 IcfgInterpreter]: Building call graph [2020-11-28 07:44:02,732 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-11-28 07:44:02,732 INFO L176 IcfgInterpreter]: Starting interpretation [2020-11-28 07:44:02,732 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-11-28 07:44:02,829 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-11-28 07:44:03,078 WARN L193 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 49 [2020-11-28 07:44:03,946 INFO L180 IcfgInterpreter]: Interpretation finished [2020-11-28 07:44:04,106 WARN L193 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 63 DAG size of output: 46 [2020-11-28 07:44:04,223 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 52 DAG size of output: 37 [2020-11-28 07:44:04,369 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 43 [2020-11-28 07:44:04,876 WARN L193 SmtUtils]: Spent 436.00 ms on a formula simplification. DAG size of input: 78 DAG size of output: 62 [2020-11-28 07:44:05,052 WARN L193 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 47 [2020-11-28 07:44:05,253 WARN L193 SmtUtils]: Spent 167.00 ms on a formula simplification. DAG size of input: 64 DAG size of output: 49 [2020-11-28 07:44:05,254 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-11-28 07:44:05,254 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-28 07:44:05,255 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 9 [2020-11-28 07:44:05,255 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [232728543] [2020-11-28 07:44:05,255 INFO L461 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-11-28 07:44:05,255 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-28 07:44:05,256 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-11-28 07:44:05,256 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2020-11-28 07:44:05,256 INFO L87 Difference]: Start difference. First operand 21 states and 29 transitions. Second operand 10 states. [2020-11-28 07:44:05,430 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 07:44:05,430 INFO L93 Difference]: Finished difference Result 42 states and 51 transitions. [2020-11-28 07:44:05,432 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-11-28 07:44:05,432 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 11 [2020-11-28 07:44:05,432 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-28 07:44:05,434 INFO L225 Difference]: With dead ends: 42 [2020-11-28 07:44:05,434 INFO L226 Difference]: Without dead ends: 31 [2020-11-28 07:44:05,435 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=70, Invalid=272, Unknown=0, NotChecked=0, Total=342 [2020-11-28 07:44:05,435 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-11-28 07:44:05,451 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 21. [2020-11-28 07:44:05,453 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-11-28 07:44:05,454 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 28 transitions. [2020-11-28 07:44:05,454 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 28 transitions. Word has length 11 [2020-11-28 07:44:05,454 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-28 07:44:05,455 INFO L481 AbstractCegarLoop]: Abstraction has 21 states and 28 transitions. [2020-11-28 07:44:05,455 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-11-28 07:44:05,455 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 28 transitions. [2020-11-28 07:44:05,456 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-11-28 07:44:05,456 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 07:44:05,456 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2020-11-28 07:44:05,679 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable95,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-28 07:44:05,679 INFO L429 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-28 07:44:05,679 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 07:44:05,680 INFO L82 PathProgramCache]: Analyzing trace with hash -953398469, now seen corresponding path program 2 times [2020-11-28 07:44:05,680 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-28 07:44:05,680 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2056061810] [2020-11-28 07:44:05,680 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 07:44:05,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-28 07:44:05,706 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-28 07:44:05,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-28 07:44:05,762 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-28 07:44:05,800 INFO L173 FreeRefinementEngine]: Strategy SIFA_TAIPAN found a feasible trace [2020-11-28 07:44:05,800 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-11-28 07:44:05,800 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable142 [2020-11-28 07:44:05,857 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 28.11 07:44:05 BoogieIcfgContainer [2020-11-28 07:44:05,858 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-11-28 07:44:05,858 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-11-28 07:44:05,859 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-11-28 07:44:05,859 INFO L275 PluginConnector]: Witness Printer initialized [2020-11-28 07:44:05,859 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.11 07:43:47" (3/4) ... [2020-11-28 07:44:05,861 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2020-11-28 07:44:05,934 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/run_dir_c876b157-2b63-47b3-8cb2-dbe56c6dd481/bin/utaipan/witness.graphml [2020-11-28 07:44:05,934 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-11-28 07:44:05,935 INFO L168 Benchmark]: Toolchain (without parser) took 19761.62 ms. Allocated memory was 77.6 MB in the beginning and 207.6 MB in the end (delta: 130.0 MB). Free memory was 43.5 MB in the beginning and 109.3 MB in the end (delta: -65.8 MB). Peak memory consumption was 62.7 MB. Max. memory is 16.1 GB. [2020-11-28 07:44:05,936 INFO L168 Benchmark]: CDTParser took 0.26 ms. Allocated memory is still 77.6 MB. Free memory was 59.5 MB in the beginning and 59.4 MB in the end (delta: 75.6 kB). There was no memory consumed. Max. memory is 16.1 GB. [2020-11-28 07:44:05,936 INFO L168 Benchmark]: CACSL2BoogieTranslator took 301.62 ms. Allocated memory was 77.6 MB in the beginning and 94.4 MB in the end (delta: 16.8 MB). Free memory was 43.3 MB in the beginning and 70.1 MB in the end (delta: -26.8 MB). Peak memory consumption was 3.6 MB. Max. memory is 16.1 GB. [2020-11-28 07:44:05,937 INFO L168 Benchmark]: Boogie Procedure Inliner took 43.15 ms. Allocated memory is still 94.4 MB. Free memory was 70.1 MB in the beginning and 68.6 MB in the end (delta: 1.5 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-11-28 07:44:05,937 INFO L168 Benchmark]: Boogie Preprocessor took 45.43 ms. Allocated memory is still 94.4 MB. Free memory was 68.6 MB in the beginning and 67.3 MB in the end (delta: 1.2 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-11-28 07:44:05,938 INFO L168 Benchmark]: RCFGBuilder took 652.90 ms. Allocated memory is still 94.4 MB. Free memory was 67.3 MB in the beginning and 67.2 MB in the end (delta: 69.8 kB). Peak memory consumption was 18.9 MB. Max. memory is 16.1 GB. [2020-11-28 07:44:05,939 INFO L168 Benchmark]: TraceAbstraction took 18632.36 ms. Allocated memory was 94.4 MB in the beginning and 207.6 MB in the end (delta: 113.2 MB). Free memory was 66.9 MB in the beginning and 112.4 MB in the end (delta: -45.5 MB). Peak memory consumption was 69.9 MB. Max. memory is 16.1 GB. [2020-11-28 07:44:05,939 INFO L168 Benchmark]: Witness Printer took 75.69 ms. Allocated memory is still 207.6 MB. Free memory was 111.4 MB in the beginning and 109.3 MB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-11-28 07:44:05,944 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.26 ms. Allocated memory is still 77.6 MB. Free memory was 59.5 MB in the beginning and 59.4 MB in the end (delta: 75.6 kB). There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 301.62 ms. Allocated memory was 77.6 MB in the beginning and 94.4 MB in the end (delta: 16.8 MB). Free memory was 43.3 MB in the beginning and 70.1 MB in the end (delta: -26.8 MB). Peak memory consumption was 3.6 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 43.15 ms. Allocated memory is still 94.4 MB. Free memory was 70.1 MB in the beginning and 68.6 MB in the end (delta: 1.5 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Boogie Preprocessor took 45.43 ms. Allocated memory is still 94.4 MB. Free memory was 68.6 MB in the beginning and 67.3 MB in the end (delta: 1.2 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * RCFGBuilder took 652.90 ms. Allocated memory is still 94.4 MB. Free memory was 67.3 MB in the beginning and 67.2 MB in the end (delta: 69.8 kB). Peak memory consumption was 18.9 MB. Max. memory is 16.1 GB. * TraceAbstraction took 18632.36 ms. Allocated memory was 94.4 MB in the beginning and 207.6 MB in the end (delta: 113.2 MB). Free memory was 66.9 MB in the beginning and 112.4 MB in the end (delta: -45.5 MB). Peak memory consumption was 69.9 MB. Max. memory is 16.1 GB. * Witness Printer took 75.69 ms. Allocated memory is still 207.6 MB. Free memory was 111.4 MB in the beginning and 109.3 MB in the end (delta: 2.1 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: 3]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L16] int MAX = __VERIFIER_nondet_uint(); [L17] COND FALSE !(!(MAX > 0)) [L18] char str1[MAX], str2[MAX]; [L19] int cont, i, j; [L20] cont = 0 [L22] i=0 [L22] COND TRUE i= 0 [L30] EXPR str1[0] [L30] str2[j] = str1[0] [L31] j++ [L29] i-- [L29] COND TRUE i >= 0 [L30] EXPR str1[0] [L30] str2[j] = str1[0] [L31] j++ [L29] i-- [L29] COND FALSE !(i >= 0) [L34] j = MAX-1 [L35] i=0 [L35] COND TRUE i