./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loops/string-2.i --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_db4baf74-9512-4006-92c7-2c39e6198b11/bin/utaipan/data/config -Xmx15G -Xms4m -jar /tmp/vcloud-vcloud-master/worker/run_dir_db4baf74-9512-4006-92c7-2c39e6198b11/bin/utaipan/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_db4baf74-9512-4006-92c7-2c39e6198b11/bin/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_db4baf74-9512-4006-92c7-2c39e6198b11/bin/utaipan/config/TaipanReach.xml -i ../../sv-benchmarks/c/loops/string-2.i -s /tmp/vcloud-vcloud-master/worker/run_dir_db4baf74-9512-4006-92c7-2c39e6198b11/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_db4baf74-9512-4006-92c7-2c39e6198b11/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 826ba3ecb74a591f4e23afc2c932e6d22d2291c8 ................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... Execution finished normally Using bit-precise analysis Retrying with bit-precise analysis Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/run_dir_db4baf74-9512-4006-92c7-2c39e6198b11/bin/utaipan/data/config -Xmx15G -Xms4m -jar /tmp/vcloud-vcloud-master/worker/run_dir_db4baf74-9512-4006-92c7-2c39e6198b11/bin/utaipan/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_db4baf74-9512-4006-92c7-2c39e6198b11/bin/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_db4baf74-9512-4006-92c7-2c39e6198b11/bin/utaipan/config/TaipanReach.xml -i ../../sv-benchmarks/c/loops/string-2.i -s /tmp/vcloud-vcloud-master/worker/run_dir_db4baf74-9512-4006-92c7-2c39e6198b11/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Bitvector.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_db4baf74-9512-4006-92c7-2c39e6198b11/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 826ba3ecb74a591f4e23afc2c932e6d22d2291c8 .................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................. 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 07:42:30,739 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-11-28 07:42:30,745 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-11-28 07:42:30,784 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-11-28 07:42:30,785 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-11-28 07:42:30,792 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-11-28 07:42:30,794 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-11-28 07:42:30,801 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-11-28 07:42:30,804 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-11-28 07:42:30,843 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-11-28 07:42:30,844 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-11-28 07:42:30,846 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-11-28 07:42:30,847 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-11-28 07:42:30,850 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-11-28 07:42:30,852 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-11-28 07:42:30,854 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-11-28 07:42:30,855 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-11-28 07:42:30,859 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-11-28 07:42:30,862 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-11-28 07:42:30,870 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-11-28 07:42:30,872 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-11-28 07:42:30,873 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-11-28 07:42:30,875 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-11-28 07:42:30,876 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-11-28 07:42:30,885 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-11-28 07:42:30,885 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-11-28 07:42:30,886 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-11-28 07:42:30,887 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-11-28 07:42:30,888 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-11-28 07:42:30,889 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-11-28 07:42:30,890 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-11-28 07:42:30,891 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-11-28 07:42:30,893 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-11-28 07:42:30,894 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-11-28 07:42:30,895 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-11-28 07:42:30,896 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-11-28 07:42:30,896 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-11-28 07:42:30,897 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-11-28 07:42:30,897 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-11-28 07:42:30,898 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-11-28 07:42:30,900 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-11-28 07:42:30,902 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/run_dir_db4baf74-9512-4006-92c7-2c39e6198b11/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf [2020-11-28 07:42:30,940 INFO L113 SettingsManager]: Loading preferences was successful [2020-11-28 07:42:30,941 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-11-28 07:42:30,941 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2020-11-28 07:42:30,945 INFO L138 SettingsManager]: * User list type=DISABLED [2020-11-28 07:42:30,945 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2020-11-28 07:42:30,946 INFO L138 SettingsManager]: * Explicit value domain=true [2020-11-28 07:42:30,946 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2020-11-28 07:42:30,946 INFO L138 SettingsManager]: * Octagon Domain=false [2020-11-28 07:42:30,946 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2020-11-28 07:42:30,946 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2020-11-28 07:42:30,948 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2020-11-28 07:42:30,948 INFO L138 SettingsManager]: * Interval Domain=false [2020-11-28 07:42:30,948 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2020-11-28 07:42:30,948 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2020-11-28 07:42:30,949 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2020-11-28 07:42:30,949 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-11-28 07:42:30,950 INFO L138 SettingsManager]: * sizeof long=4 [2020-11-28 07:42:30,950 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-11-28 07:42:30,950 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-11-28 07:42:30,950 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-11-28 07:42:30,951 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-11-28 07:42:30,951 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-11-28 07:42:30,951 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-11-28 07:42:30,952 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2020-11-28 07:42:30,952 INFO L138 SettingsManager]: * sizeof long double=12 [2020-11-28 07:42:30,952 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-11-28 07:42:30,952 INFO L138 SettingsManager]: * Use constant arrays=true [2020-11-28 07:42:30,953 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-11-28 07:42:30,953 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-11-28 07:42:30,954 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-11-28 07:42:30,955 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-11-28 07:42:30,955 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-11-28 07:42:30,955 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-11-28 07:42:30,956 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-11-28 07:42:30,956 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-11-28 07:42:30,956 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2020-11-28 07:42:30,956 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-11-28 07:42:30,956 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-11-28 07:42:30,957 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-11-28 07:42:30,957 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2020-11-28 07:42:30,957 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_db4baf74-9512-4006-92c7-2c39e6198b11/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud-vcloud-master/worker/run_dir_db4baf74-9512-4006-92c7-2c39e6198b11/bin/utaipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 826ba3ecb74a591f4e23afc2c932e6d22d2291c8 [2020-11-28 07:42:31,261 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-11-28 07:42:31,300 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-11-28 07:42:31,303 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-11-28 07:42:31,304 INFO L271 PluginConnector]: Initializing CDTParser... [2020-11-28 07:42:31,306 INFO L275 PluginConnector]: CDTParser initialized [2020-11-28 07:42:31,307 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_db4baf74-9512-4006-92c7-2c39e6198b11/bin/utaipan/../../sv-benchmarks/c/loops/string-2.i [2020-11-28 07:42:31,379 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_db4baf74-9512-4006-92c7-2c39e6198b11/bin/utaipan/data/1db43d724/82f0d35dcdfa40cfbb847a291ab2ff60/FLAG7a5056d87 [2020-11-28 07:42:31,848 INFO L306 CDTParser]: Found 1 translation units. [2020-11-28 07:42:31,849 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_db4baf74-9512-4006-92c7-2c39e6198b11/sv-benchmarks/c/loops/string-2.i [2020-11-28 07:42:31,861 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_db4baf74-9512-4006-92c7-2c39e6198b11/bin/utaipan/data/1db43d724/82f0d35dcdfa40cfbb847a291ab2ff60/FLAG7a5056d87 [2020-11-28 07:42:32,223 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_db4baf74-9512-4006-92c7-2c39e6198b11/bin/utaipan/data/1db43d724/82f0d35dcdfa40cfbb847a291ab2ff60 [2020-11-28 07:42:32,225 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-11-28 07:42:32,227 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-11-28 07:42:32,233 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-11-28 07:42:32,233 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-11-28 07:42:32,237 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-11-28 07:42:32,238 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 28.11 07:42:32" (1/1) ... [2020-11-28 07:42:32,241 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3077ce58 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:42:32, skipping insertion in model container [2020-11-28 07:42:32,241 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 28.11 07:42:32" (1/1) ... [2020-11-28 07:42:32,248 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-11-28 07:42:32,270 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-11-28 07:42:32,479 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-28 07:42:32,489 INFO L203 MainTranslator]: Completed pre-run [2020-11-28 07:42:32,531 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-28 07:42:32,551 INFO L208 MainTranslator]: Completed translation [2020-11-28 07:42:32,552 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:42:32 WrapperNode [2020-11-28 07:42:32,552 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-11-28 07:42:32,554 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-11-28 07:42:32,555 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-11-28 07:42:32,555 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-11-28 07:42:32,562 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:42:32" (1/1) ... [2020-11-28 07:42:32,580 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:42:32" (1/1) ... [2020-11-28 07:42:32,610 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-11-28 07:42:32,611 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-11-28 07:42:32,611 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-11-28 07:42:32,611 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-11-28 07:42:32,619 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:42:32" (1/1) ... [2020-11-28 07:42:32,620 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:42:32" (1/1) ... [2020-11-28 07:42:32,633 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:42:32" (1/1) ... [2020-11-28 07:42:32,633 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:42:32" (1/1) ... [2020-11-28 07:42:32,644 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:42:32" (1/1) ... [2020-11-28 07:42:32,653 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:42:32" (1/1) ... [2020-11-28 07:42:32,660 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:42:32" (1/1) ... [2020-11-28 07:42:32,663 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-11-28 07:42:32,667 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-11-28 07:42:32,668 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-11-28 07:42:32,668 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-11-28 07:42:32,669 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:42:32" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_db4baf74-9512-4006-92c7-2c39e6198b11/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 07:42:32,741 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-11-28 07:42:32,742 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-11-28 07:42:32,742 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-11-28 07:42:32,742 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-11-28 07:42:32,742 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-11-28 07:42:32,743 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-11-28 07:42:32,743 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-11-28 07:42:33,358 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-11-28 07:42:33,358 INFO L298 CfgBuilder]: Removed 13 assume(true) statements. [2020-11-28 07:42:33,360 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.11 07:42:33 BoogieIcfgContainer [2020-11-28 07:42:33,360 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-11-28 07:42:33,361 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-11-28 07:42:33,362 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-11-28 07:42:33,364 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-11-28 07:42:33,365 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 28.11 07:42:32" (1/3) ... [2020-11-28 07:42:33,366 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@490ee6b6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 28.11 07:42:33, skipping insertion in model container [2020-11-28 07:42:33,366 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:42:32" (2/3) ... [2020-11-28 07:42:33,366 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@490ee6b6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 28.11 07:42:33, skipping insertion in model container [2020-11-28 07:42:33,366 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.11 07:42:33" (3/3) ... [2020-11-28 07:42:33,368 INFO L111 eAbstractionObserver]: Analyzing ICFG string-2.i [2020-11-28 07:42:33,378 INFO L164 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-11-28 07:42:33,382 INFO L176 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-11-28 07:42:33,393 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-11-28 07:42:33,428 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-11-28 07:42:33,428 INFO L378 AbstractCegarLoop]: Hoare is true [2020-11-28 07:42:33,428 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-11-28 07:42:33,429 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-11-28 07:42:33,429 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-11-28 07:42:33,429 INFO L382 AbstractCegarLoop]: Difference is false [2020-11-28 07:42:33,429 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-11-28 07:42:33,429 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-11-28 07:42:33,442 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2020-11-28 07:42:33,452 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-11-28 07:42:33,452 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 07:42:33,453 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-28 07:42:33,453 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-28 07:42:33,458 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 07:42:33,459 INFO L82 PathProgramCache]: Analyzing trace with hash 137572861, now seen corresponding path program 1 times [2020-11-28 07:42:33,468 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-28 07:42:33,469 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1047303894] [2020-11-28 07:42:33,469 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 07:42:33,594 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 07:42:33,675 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 07:42:33,675 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1047303894] [2020-11-28 07:42:33,676 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-28 07:42:33,676 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-11-28 07:42:33,677 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [661543] [2020-11-28 07:42:33,681 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-11-28 07:42:33,681 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-28 07:42:33,697 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-11-28 07:42:33,698 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-11-28 07:42:33,700 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 3 states. [2020-11-28 07:42:33,762 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 07:42:33,762 INFO L93 Difference]: Finished difference Result 47 states and 72 transitions. [2020-11-28 07:42:33,763 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-11-28 07:42:33,764 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 13 [2020-11-28 07:42:33,765 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-28 07:42:33,782 INFO L225 Difference]: With dead ends: 47 [2020-11-28 07:42:33,782 INFO L226 Difference]: Without dead ends: 23 [2020-11-28 07:42:33,785 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 07:42:33,813 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-11-28 07:42:33,829 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 18. [2020-11-28 07:42:33,830 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-11-28 07:42:33,832 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 22 transitions. [2020-11-28 07:42:33,833 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 22 transitions. Word has length 13 [2020-11-28 07:42:33,834 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-28 07:42:33,834 INFO L481 AbstractCegarLoop]: Abstraction has 18 states and 22 transitions. [2020-11-28 07:42:33,834 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-11-28 07:42:33,834 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 22 transitions. [2020-11-28 07:42:33,835 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-11-28 07:42:33,835 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 07:42:33,835 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-28 07:42:33,836 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-11-28 07:42:33,836 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-28 07:42:33,838 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 07:42:33,839 INFO L82 PathProgramCache]: Analyzing trace with hash 78315596, now seen corresponding path program 1 times [2020-11-28 07:42:33,839 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-28 07:42:33,839 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [548772509] [2020-11-28 07:42:33,839 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 07:42:33,874 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 07:42:33,924 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-11-28 07:42:33,925 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [548772509] [2020-11-28 07:42:33,925 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1255015419] [2020-11-28 07:42:33,925 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_db4baf74-9512-4006-92c7-2c39e6198b11/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 07:42:34,002 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 07:42:34,004 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 3 conjunts are in the unsatisfiable core [2020-11-28 07:42:34,009 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 07:42:34,066 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-11-28 07:42:34,066 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-28 07:42:34,103 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-11-28 07:42:34,104 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1159299456] [2020-11-28 07:42:34,141 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2020-11-28 07:42:34,141 INFO L166 IcfgInterpreter]: Building call graph [2020-11-28 07:42:34,146 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-11-28 07:42:34,152 INFO L176 IcfgInterpreter]: Starting interpretation [2020-11-28 07:42:34,153 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-11-28 07:42:35,342 INFO L180 IcfgInterpreter]: Interpretation finished [2020-11-28 07:42:35,555 WARN L193 SmtUtils]: Spent 205.00 ms on a formula simplification. DAG size of input: 77 DAG size of output: 58 [2020-11-28 07:42:35,668 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 42 DAG size of output: 30 [2020-11-28 07:42:35,822 WARN L193 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 51 DAG size of output: 38 [2020-11-28 07:42:35,984 WARN L193 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 51 DAG size of output: 38 [2020-11-28 07:42:36,184 WARN L193 SmtUtils]: Spent 179.00 ms on a formula simplification. DAG size of input: 52 DAG size of output: 39 [2020-11-28 07:42:36,332 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 57 DAG size of output: 44 [2020-11-28 07:42:36,467 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 56 DAG size of output: 43 [2020-11-28 07:42:36,638 WARN L193 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 45 [2020-11-28 07:42:36,864 WARN L193 SmtUtils]: Spent 180.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 49 [2020-11-28 07:42:37,068 WARN L193 SmtUtils]: Spent 165.00 ms on a formula simplification. DAG size of input: 61 DAG size of output: 48 [2020-11-28 07:42:37,285 WARN L193 SmtUtils]: Spent 171.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 49 [2020-11-28 07:42:37,520 WARN L193 SmtUtils]: Spent 206.00 ms on a formula simplification. DAG size of input: 76 DAG size of output: 62 [2020-11-28 07:42:37,523 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-11-28 07:42:37,523 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-28 07:42:37,523 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2020-11-28 07:42:37,524 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [176342755] [2020-11-28 07:42:37,525 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-11-28 07:42:37,525 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-28 07:42:37,526 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-11-28 07:42:37,526 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=262, Unknown=0, NotChecked=0, Total=342 [2020-11-28 07:42:37,527 INFO L87 Difference]: Start difference. First operand 18 states and 22 transitions. Second operand 7 states. [2020-11-28 07:42:37,602 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 07:42:37,603 INFO L93 Difference]: Finished difference Result 44 states and 57 transitions. [2020-11-28 07:42:37,603 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-11-28 07:42:37,604 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 17 [2020-11-28 07:42:37,604 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-28 07:42:37,604 INFO L225 Difference]: With dead ends: 44 [2020-11-28 07:42:37,605 INFO L226 Difference]: Without dead ends: 29 [2020-11-28 07:42:37,606 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 105 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=80, Invalid=262, Unknown=0, NotChecked=0, Total=342 [2020-11-28 07:42:37,606 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-11-28 07:42:37,610 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 24. [2020-11-28 07:42:37,610 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-11-28 07:42:37,611 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 28 transitions. [2020-11-28 07:42:37,611 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 28 transitions. Word has length 17 [2020-11-28 07:42:37,611 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-28 07:42:37,611 INFO L481 AbstractCegarLoop]: Abstraction has 24 states and 28 transitions. [2020-11-28 07:42:37,611 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-11-28 07:42:37,611 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 28 transitions. [2020-11-28 07:42:37,612 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-11-28 07:42:37,612 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 07:42:37,612 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-28 07:42:37,826 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2020-11-28 07:42:37,826 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-28 07:42:37,827 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 07:42:37,827 INFO L82 PathProgramCache]: Analyzing trace with hash 971216999, now seen corresponding path program 2 times [2020-11-28 07:42:37,827 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-28 07:42:37,827 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1311824401] [2020-11-28 07:42:37,827 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 07:42:37,882 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 07:42:37,969 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2020-11-28 07:42:37,970 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1311824401] [2020-11-28 07:42:37,970 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [114489750] [2020-11-28 07:42:37,970 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_db4baf74-9512-4006-92c7-2c39e6198b11/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 07:42:38,054 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2020-11-28 07:42:38,054 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-28 07:42:38,056 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 6 conjunts are in the unsatisfiable core [2020-11-28 07:42:38,058 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 07:42:38,108 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2020-11-28 07:42:38,108 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-28 07:42:38,146 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2020-11-28 07:42:38,149 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [964697839] [2020-11-28 07:42:38,155 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2020-11-28 07:42:38,155 INFO L166 IcfgInterpreter]: Building call graph [2020-11-28 07:42:38,155 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-11-28 07:42:38,156 INFO L176 IcfgInterpreter]: Starting interpretation [2020-11-28 07:42:38,156 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-11-28 07:42:39,040 INFO L180 IcfgInterpreter]: Interpretation finished [2020-11-28 07:42:39,266 WARN L193 SmtUtils]: Spent 217.00 ms on a formula simplification. DAG size of input: 77 DAG size of output: 58 [2020-11-28 07:42:39,425 WARN L193 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 42 DAG size of output: 30 [2020-11-28 07:42:39,578 WARN L193 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 51 DAG size of output: 38 [2020-11-28 07:42:39,733 WARN L193 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 51 DAG size of output: 38 [2020-11-28 07:42:39,895 WARN L193 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 52 DAG size of output: 39 [2020-11-28 07:42:40,123 WARN L193 SmtUtils]: Spent 200.00 ms on a formula simplification. DAG size of input: 57 DAG size of output: 44 [2020-11-28 07:42:40,301 WARN L193 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 56 DAG size of output: 43 [2020-11-28 07:42:40,485 WARN L193 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 45 [2020-11-28 07:42:40,636 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 49 [2020-11-28 07:42:40,797 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 61 DAG size of output: 48 [2020-11-28 07:42:40,965 WARN L193 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 49 [2020-11-28 07:42:41,175 WARN L193 SmtUtils]: Spent 181.00 ms on a formula simplification. DAG size of input: 76 DAG size of output: 62 [2020-11-28 07:42:41,177 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-11-28 07:42:41,177 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-28 07:42:41,177 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 7 [2020-11-28 07:42:41,178 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [908540417] [2020-11-28 07:42:41,178 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-11-28 07:42:41,178 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-28 07:42:41,179 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-11-28 07:42:41,179 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=290, Unknown=0, NotChecked=0, Total=380 [2020-11-28 07:42:41,179 INFO L87 Difference]: Start difference. First operand 24 states and 28 transitions. Second operand 8 states. [2020-11-28 07:42:41,247 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 07:42:41,248 INFO L93 Difference]: Finished difference Result 49 states and 58 transitions. [2020-11-28 07:42:41,250 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-11-28 07:42:41,250 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 23 [2020-11-28 07:42:41,250 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-28 07:42:41,251 INFO L225 Difference]: With dead ends: 49 [2020-11-28 07:42:41,251 INFO L226 Difference]: Without dead ends: 31 [2020-11-28 07:42:41,252 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 54 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 115 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=90, Invalid=290, Unknown=0, NotChecked=0, Total=380 [2020-11-28 07:42:41,252 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-11-28 07:42:41,260 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 26. [2020-11-28 07:42:41,260 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-11-28 07:42:41,260 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 30 transitions. [2020-11-28 07:42:41,261 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 30 transitions. Word has length 23 [2020-11-28 07:42:41,261 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-28 07:42:41,261 INFO L481 AbstractCegarLoop]: Abstraction has 26 states and 30 transitions. [2020-11-28 07:42:41,261 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-11-28 07:42:41,261 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 30 transitions. [2020-11-28 07:42:41,262 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-11-28 07:42:41,262 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 07:42:41,262 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-28 07:42:41,462 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-28 07:42:41,463 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-28 07:42:41,463 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 07:42:41,463 INFO L82 PathProgramCache]: Analyzing trace with hash -1292619764, now seen corresponding path program 3 times [2020-11-28 07:42:41,463 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-28 07:42:41,463 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [743460718] [2020-11-28 07:42:41,464 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 07:42:41,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-28 07:42:41,522 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-28 07:42:41,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-28 07:42:41,559 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-28 07:42:41,585 INFO L173 FreeRefinementEngine]: Strategy SIFA_TAIPAN found a feasible trace [2020-11-28 07:42:41,585 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-11-28 07:42:41,585 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable59 [2020-11-28 07:42:41,625 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 28.11 07:42:41 BoogieIcfgContainer [2020-11-28 07:42:41,625 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-11-28 07:42:41,626 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-11-28 07:42:41,626 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-11-28 07:42:41,626 INFO L275 PluginConnector]: Witness Printer initialized [2020-11-28 07:42:41,627 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.11 07:42:33" (3/4) ... [2020-11-28 07:42:41,630 INFO L140 WitnessPrinter]: No result that supports witness generation found [2020-11-28 07:42:41,631 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-11-28 07:42:41,632 INFO L168 Benchmark]: Toolchain (without parser) took 9404.44 ms. Allocated memory was 100.7 MB in the beginning and 155.2 MB in the end (delta: 54.5 MB). Free memory was 71.4 MB in the beginning and 89.9 MB in the end (delta: -18.5 MB). Peak memory consumption was 34.8 MB. Max. memory is 16.1 GB. [2020-11-28 07:42:41,632 INFO L168 Benchmark]: CDTParser took 0.28 ms. Allocated memory is still 83.9 MB. Free memory is still 42.3 MB. There was no memory consumed. Max. memory is 16.1 GB. [2020-11-28 07:42:41,635 INFO L168 Benchmark]: CACSL2BoogieTranslator took 319.82 ms. Allocated memory is still 100.7 MB. Free memory was 71.4 MB in the beginning and 77.7 MB in the end (delta: -6.3 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. [2020-11-28 07:42:41,637 INFO L168 Benchmark]: Boogie Procedure Inliner took 55.72 ms. Allocated memory is still 100.7 MB. Free memory was 77.7 MB in the beginning and 76.0 MB in the end (delta: 1.7 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-11-28 07:42:41,642 INFO L168 Benchmark]: Boogie Preprocessor took 56.03 ms. Allocated memory is still 100.7 MB. Free memory was 76.0 MB in the beginning and 74.8 MB in the end (delta: 1.2 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-11-28 07:42:41,644 INFO L168 Benchmark]: RCFGBuilder took 692.68 ms. Allocated memory is still 100.7 MB. Free memory was 74.8 MB in the beginning and 50.8 MB in the end (delta: 24.0 MB). Peak memory consumption was 23.1 MB. Max. memory is 16.1 GB. [2020-11-28 07:42:41,647 INFO L168 Benchmark]: TraceAbstraction took 8264.06 ms. Allocated memory was 100.7 MB in the beginning and 155.2 MB in the end (delta: 54.5 MB). Free memory was 50.4 MB in the beginning and 89.9 MB in the end (delta: -39.5 MB). Peak memory consumption was 16.8 MB. Max. memory is 16.1 GB. [2020-11-28 07:42:41,648 INFO L168 Benchmark]: Witness Printer took 4.79 ms. Allocated memory is still 155.2 MB. Free memory is still 89.9 MB. There was no memory consumed. Max. memory is 16.1 GB. [2020-11-28 07:42:41,653 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.28 ms. Allocated memory is still 83.9 MB. Free memory is still 42.3 MB. There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 319.82 ms. Allocated memory is still 100.7 MB. Free memory was 71.4 MB in the beginning and 77.7 MB in the end (delta: -6.3 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 55.72 ms. Allocated memory is still 100.7 MB. Free memory was 77.7 MB in the beginning and 76.0 MB in the end (delta: 1.7 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Boogie Preprocessor took 56.03 ms. Allocated memory is still 100.7 MB. Free memory was 76.0 MB in the beginning and 74.8 MB in the end (delta: 1.2 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * RCFGBuilder took 692.68 ms. Allocated memory is still 100.7 MB. Free memory was 74.8 MB in the beginning and 50.8 MB in the end (delta: 24.0 MB). Peak memory consumption was 23.1 MB. Max. memory is 16.1 GB. * TraceAbstraction took 8264.06 ms. Allocated memory was 100.7 MB in the beginning and 155.2 MB in the end (delta: 54.5 MB). Free memory was 50.4 MB in the beginning and 89.9 MB in the end (delta: -39.5 MB). Peak memory consumption was 16.8 MB. Max. memory is 16.1 GB. * Witness Printer took 4.79 ms. Allocated memory is still 155.2 MB. Free memory is still 89.9 MB. There was no memory consumed. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - UnprovableResult [Line: 12]: Unable to prove that call of __VERIFIER_error() unreachable Unable to prove that call of __VERIFIER_error() unreachable Reason: overapproximation of shiftLeft at line 69. Possible FailurePath: [L31] char string_A[5], string_B[5]; [L32] int i, j, nc_A, nc_B, found=0; [L35] i=0 [L35] COND TRUE i<5 [L36] string_A[i]=__VERIFIER_nondet_char() [L35] i++ [L35] COND TRUE i<5 [L36] string_A[i]=__VERIFIER_nondet_char() [L35] i++ [L35] COND TRUE i<5 [L36] string_A[i]=__VERIFIER_nondet_char() [L35] i++ [L35] COND TRUE i<5 [L36] string_A[i]=__VERIFIER_nondet_char() [L35] i++ [L35] COND TRUE i<5 [L36] string_A[i]=__VERIFIER_nondet_char() [L35] i++ [L35] COND FALSE !(i<5) [L37] EXPR string_A[5 -1] [L37] COND FALSE !(!(string_A[5 -1]=='\0')) [L39] i=0 [L39] COND TRUE i<5 [L40] string_B[i]=__VERIFIER_nondet_char() [L39] i++ [L39] COND TRUE i<5 [L40] string_B[i]=__VERIFIER_nondet_char() [L39] i++ [L39] COND TRUE i<5 [L40] string_B[i]=__VERIFIER_nondet_char() [L39] i++ [L39] COND TRUE i<5 [L40] string_B[i]=__VERIFIER_nondet_char() [L39] i++ [L39] COND TRUE i<5 [L40] string_B[i]=__VERIFIER_nondet_char() [L39] i++ [L39] COND FALSE !(i<5) [L41] EXPR string_B[5 -1] [L41] COND FALSE !(!(string_B[5 -1]=='\0')) [L43] nc_A = 0 [L44] EXPR string_A[nc_A] [L44] COND FALSE !(string_A[nc_A]!='\0') [L47] nc_B = 0 [L48] EXPR string_B[nc_B] [L48] COND FALSE !(string_B[nc_B]!='\0') [L51] COND FALSE !(!(nc_B >= nc_A)) [L54] EXPR j=0 [L54] i=j=0 [L55] COND FALSE !((inc_B-1)< main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud-vcloud-master/worker/run_dir_db4baf74-9512-4006-92c7-2c39e6198b11/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 -> 826ba3ecb74a591f4e23afc2c932e6d22d2291c8 [2020-11-28 07:42:44,859 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-11-28 07:42:44,891 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-11-28 07:42:44,896 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-11-28 07:42:44,898 INFO L271 PluginConnector]: Initializing CDTParser... [2020-11-28 07:42:44,900 INFO L275 PluginConnector]: CDTParser initialized [2020-11-28 07:42:44,901 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_db4baf74-9512-4006-92c7-2c39e6198b11/bin/utaipan/../../sv-benchmarks/c/loops/string-2.i [2020-11-28 07:42:44,974 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_db4baf74-9512-4006-92c7-2c39e6198b11/bin/utaipan/data/fbd9a869d/dbbb8db061024827a57c990d90a4cea0/FLAG74cc36bca [2020-11-28 07:42:45,466 INFO L306 CDTParser]: Found 1 translation units. [2020-11-28 07:42:45,466 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_db4baf74-9512-4006-92c7-2c39e6198b11/sv-benchmarks/c/loops/string-2.i [2020-11-28 07:42:45,473 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_db4baf74-9512-4006-92c7-2c39e6198b11/bin/utaipan/data/fbd9a869d/dbbb8db061024827a57c990d90a4cea0/FLAG74cc36bca [2020-11-28 07:42:45,832 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_db4baf74-9512-4006-92c7-2c39e6198b11/bin/utaipan/data/fbd9a869d/dbbb8db061024827a57c990d90a4cea0 [2020-11-28 07:42:45,835 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-11-28 07:42:45,836 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-11-28 07:42:45,843 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-11-28 07:42:45,843 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-11-28 07:42:45,848 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-11-28 07:42:45,849 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 28.11 07:42:45" (1/1) ... [2020-11-28 07:42:45,851 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6a788778 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:42:45, skipping insertion in model container [2020-11-28 07:42:45,851 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 28.11 07:42:45" (1/1) ... [2020-11-28 07:42:45,859 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-11-28 07:42:45,875 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-11-28 07:42:46,051 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-28 07:42:46,062 INFO L203 MainTranslator]: Completed pre-run [2020-11-28 07:42:46,145 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-28 07:42:46,161 INFO L208 MainTranslator]: Completed translation [2020-11-28 07:42:46,168 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:42:46 WrapperNode [2020-11-28 07:42:46,169 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-11-28 07:42:46,170 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-11-28 07:42:46,170 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-11-28 07:42:46,170 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-11-28 07:42:46,178 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:42:46" (1/1) ... [2020-11-28 07:42:46,188 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:42:46" (1/1) ... [2020-11-28 07:42:46,212 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-11-28 07:42:46,213 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-11-28 07:42:46,213 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-11-28 07:42:46,213 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-11-28 07:42:46,222 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:42:46" (1/1) ... [2020-11-28 07:42:46,222 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:42:46" (1/1) ... [2020-11-28 07:42:46,226 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:42:46" (1/1) ... [2020-11-28 07:42:46,226 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:42:46" (1/1) ... [2020-11-28 07:42:46,234 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:42:46" (1/1) ... [2020-11-28 07:42:46,240 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:42:46" (1/1) ... [2020-11-28 07:42:46,242 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:42:46" (1/1) ... [2020-11-28 07:42:46,245 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-11-28 07:42:46,246 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-11-28 07:42:46,247 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-11-28 07:42:46,247 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-11-28 07:42:46,248 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:42:46" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_db4baf74-9512-4006-92c7-2c39e6198b11/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 07:42:46,322 INFO L130 BoogieDeclarations]: Found specification of procedure read~intINTTYPE1 [2020-11-28 07:42:46,322 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2020-11-28 07:42:46,325 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-11-28 07:42:46,325 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-11-28 07:42:46,325 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-11-28 07:42:46,326 INFO L130 BoogieDeclarations]: Found specification of procedure write~intINTTYPE1 [2020-11-28 07:42:46,326 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-11-28 07:42:46,950 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-11-28 07:42:46,951 INFO L298 CfgBuilder]: Removed 13 assume(true) statements. [2020-11-28 07:42:46,953 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.11 07:42:46 BoogieIcfgContainer [2020-11-28 07:42:46,953 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-11-28 07:42:46,955 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-11-28 07:42:46,955 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-11-28 07:42:46,958 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-11-28 07:42:46,959 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 28.11 07:42:45" (1/3) ... [2020-11-28 07:42:46,960 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@9689706 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 28.11 07:42:46, skipping insertion in model container [2020-11-28 07:42:46,960 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:42:46" (2/3) ... [2020-11-28 07:42:46,961 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@9689706 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 28.11 07:42:46, skipping insertion in model container [2020-11-28 07:42:46,962 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.11 07:42:46" (3/3) ... [2020-11-28 07:42:46,963 INFO L111 eAbstractionObserver]: Analyzing ICFG string-2.i [2020-11-28 07:42:46,975 INFO L164 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-11-28 07:42:46,979 INFO L176 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-11-28 07:42:46,991 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-11-28 07:42:47,032 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-11-28 07:42:47,032 INFO L378 AbstractCegarLoop]: Hoare is true [2020-11-28 07:42:47,033 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-11-28 07:42:47,033 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-11-28 07:42:47,033 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-11-28 07:42:47,033 INFO L382 AbstractCegarLoop]: Difference is false [2020-11-28 07:42:47,033 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-11-28 07:42:47,034 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-11-28 07:42:47,051 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states. [2020-11-28 07:42:47,056 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-11-28 07:42:47,057 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 07:42:47,058 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-28 07:42:47,058 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-28 07:42:47,065 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 07:42:47,065 INFO L82 PathProgramCache]: Analyzing trace with hash -610986519, now seen corresponding path program 1 times [2020-11-28 07:42:47,078 INFO L162 FreeRefinementEngine]: Executing refinement strategy WALRUS [2020-11-28 07:42:47,079 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [774195304] [2020-11-28 07:42:47,080 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_db4baf74-9512-4006-92c7-2c39e6198b11/bin/utaipan/mathsat Starting monitored process 2 with mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with mathsat -unsat_core_generation=3 [2020-11-28 07:42:47,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 07:42:47,207 INFO L263 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 1 conjunts are in the unsatisfiable core [2020-11-28 07:42:47,211 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 07:42:47,229 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 07:42:47,230 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-28 07:42:47,236 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 07:42:47,237 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [774195304] [2020-11-28 07:42:47,238 INFO L219 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2020-11-28 07:42:47,238 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 2] imperfect sequences [] total 2 [2020-11-28 07:42:47,239 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1314797252] [2020-11-28 07:42:47,243 INFO L461 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-11-28 07:42:47,244 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2020-11-28 07:42:47,255 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-11-28 07:42:47,257 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-11-28 07:42:47,259 INFO L87 Difference]: Start difference. First operand 29 states. Second operand 2 states. [2020-11-28 07:42:47,286 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 07:42:47,296 INFO L93 Difference]: Finished difference Result 53 states and 81 transitions. [2020-11-28 07:42:47,297 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-11-28 07:42:47,299 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 18 [2020-11-28 07:42:47,299 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-28 07:42:47,308 INFO L225 Difference]: With dead ends: 53 [2020-11-28 07:42:47,309 INFO L226 Difference]: Without dead ends: 24 [2020-11-28 07:42:47,312 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-11-28 07:42:47,329 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-11-28 07:42:47,343 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-11-28 07:42:47,344 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-11-28 07:42:47,345 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 29 transitions. [2020-11-28 07:42:47,346 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 29 transitions. Word has length 18 [2020-11-28 07:42:47,346 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-28 07:42:47,347 INFO L481 AbstractCegarLoop]: Abstraction has 24 states and 29 transitions. [2020-11-28 07:42:47,347 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-11-28 07:42:47,347 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 29 transitions. [2020-11-28 07:42:47,347 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-11-28 07:42:47,348 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 07:42:47,348 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-28 07:42:47,554 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 mathsat -unsat_core_generation=3 [2020-11-28 07:42:47,554 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-28 07:42:47,555 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 07:42:47,555 INFO L82 PathProgramCache]: Analyzing trace with hash -2052613417, now seen corresponding path program 1 times [2020-11-28 07:42:47,556 INFO L162 FreeRefinementEngine]: Executing refinement strategy WALRUS [2020-11-28 07:42:47,557 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1763088200] [2020-11-28 07:42:47,557 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_db4baf74-9512-4006-92c7-2c39e6198b11/bin/utaipan/mathsat Starting monitored process 3 with mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with mathsat -unsat_core_generation=3 [2020-11-28 07:42:47,654 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 07:42:47,657 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 2 conjunts are in the unsatisfiable core [2020-11-28 07:42:47,658 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 07:42:47,723 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 07:42:47,734 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-28 07:42:47,796 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 07:42:47,797 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1763088200] [2020-11-28 07:42:47,797 INFO L219 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2020-11-28 07:42:47,797 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 4 [2020-11-28 07:42:47,797 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [607701687] [2020-11-28 07:42:47,798 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-11-28 07:42:47,799 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2020-11-28 07:42:47,799 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-11-28 07:42:47,809 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-11-28 07:42:47,809 INFO L87 Difference]: Start difference. First operand 24 states and 29 transitions. Second operand 4 states. [2020-11-28 07:42:48,017 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 07:42:48,017 INFO L93 Difference]: Finished difference Result 66 states and 81 transitions. [2020-11-28 07:42:48,019 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-11-28 07:42:48,019 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 20 [2020-11-28 07:42:48,020 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-28 07:42:48,022 INFO L225 Difference]: With dead ends: 66 [2020-11-28 07:42:48,022 INFO L226 Difference]: Without dead ends: 46 [2020-11-28 07:42:48,023 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-11-28 07:42:48,023 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-11-28 07:42:48,036 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 30. [2020-11-28 07:42:48,039 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-11-28 07:42:48,040 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 35 transitions. [2020-11-28 07:42:48,041 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 35 transitions. Word has length 20 [2020-11-28 07:42:48,042 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-28 07:42:48,043 INFO L481 AbstractCegarLoop]: Abstraction has 30 states and 35 transitions. [2020-11-28 07:42:48,043 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-11-28 07:42:48,044 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 35 transitions. [2020-11-28 07:42:48,044 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-11-28 07:42:48,046 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 07:42:48,046 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-28 07:42:48,264 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 mathsat -unsat_core_generation=3 [2020-11-28 07:42:48,265 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-28 07:42:48,265 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 07:42:48,265 INFO L82 PathProgramCache]: Analyzing trace with hash -326197737, now seen corresponding path program 1 times [2020-11-28 07:42:48,266 INFO L162 FreeRefinementEngine]: Executing refinement strategy WALRUS [2020-11-28 07:42:48,267 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [260452392] [2020-11-28 07:42:48,267 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_db4baf74-9512-4006-92c7-2c39e6198b11/bin/utaipan/mathsat Starting monitored process 4 with mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with mathsat -unsat_core_generation=3 [2020-11-28 07:42:48,379 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 07:42:48,382 INFO L263 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 4 conjunts are in the unsatisfiable core [2020-11-28 07:42:48,385 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 07:42:48,431 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-11-28 07:42:48,432 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-28 07:42:48,630 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-11-28 07:42:48,631 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [260452392] [2020-11-28 07:42:48,631 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [183414419] [2020-11-28 07:42:48,631 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_db4baf74-9512-4006-92c7-2c39e6198b11/bin/utaipan/cvc4 Starting monitored process 5 with cvc4 --incremental --print-success --lang smt --rewrite-divk (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with cvc4 --incremental --print-success --lang smt --rewrite-divk [2020-11-28 07:42:48,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 07:42:48,786 INFO L263 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 4 conjunts are in the unsatisfiable core [2020-11-28 07:42:48,788 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 07:42:48,799 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-11-28 07:42:48,800 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-28 07:42:48,895 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-11-28 07:42:48,895 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1133567783] [2020-11-28 07:42:48,895 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_db4baf74-9512-4006-92c7-2c39e6198b11/bin/utaipan/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-28 07:42:49,006 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 07:42:49,009 INFO L263 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 8 conjunts are in the unsatisfiable core [2020-11-28 07:42:49,010 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 07:42:49,098 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2020-11-28 07:42:49,098 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-28 07:42:49,129 INFO L603 QuantifierPusher]: Distributing 2 disjuncts over 3 conjuncts [2020-11-28 07:42:49,260 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2020-11-28 07:42:49,261 INFO L219 FreeRefinementEngine]: Constructing automaton from 2 perfect and 4 imperfect interpolant sequences. [2020-11-28 07:42:49,261 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 4] imperfect sequences [5, 6, 5, 5] total 14 [2020-11-28 07:42:49,261 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1567896638] [2020-11-28 07:42:49,262 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-11-28 07:42:49,262 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2020-11-28 07:42:49,263 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-11-28 07:42:49,263 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=134, Unknown=0, NotChecked=0, Total=182 [2020-11-28 07:42:49,263 INFO L87 Difference]: Start difference. First operand 30 states and 35 transitions. Second operand 7 states. [2020-11-28 07:42:49,666 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 07:42:49,666 INFO L93 Difference]: Finished difference Result 47 states and 56 transitions. [2020-11-28 07:42:49,667 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-11-28 07:42:49,668 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 28 [2020-11-28 07:42:49,668 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-28 07:42:49,669 INFO L225 Difference]: With dead ends: 47 [2020-11-28 07:42:49,669 INFO L226 Difference]: Without dead ends: 33 [2020-11-28 07:42:49,670 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 164 GetRequests, 148 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=66, Invalid=174, Unknown=0, NotChecked=0, Total=240 [2020-11-28 07:42:49,670 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-11-28 07:42:49,678 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-11-28 07:42:49,678 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-11-28 07:42:49,680 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 38 transitions. [2020-11-28 07:42:49,680 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 38 transitions. Word has length 28 [2020-11-28 07:42:49,681 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-28 07:42:49,681 INFO L481 AbstractCegarLoop]: Abstraction has 33 states and 38 transitions. [2020-11-28 07:42:49,682 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-11-28 07:42:49,682 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 38 transitions. [2020-11-28 07:42:49,683 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-11-28 07:42:49,684 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 07:42:49,685 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-28 07:42:50,298 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 mathsat -unsat_core_generation=3,5 cvc4 --incremental --print-success --lang smt --rewrite-divk,6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-28 07:42:50,299 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-28 07:42:50,299 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 07:42:50,299 INFO L82 PathProgramCache]: Analyzing trace with hash 133280437, now seen corresponding path program 1 times [2020-11-28 07:42:50,300 INFO L162 FreeRefinementEngine]: Executing refinement strategy WALRUS [2020-11-28 07:42:50,300 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1457979521] [2020-11-28 07:42:50,300 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_db4baf74-9512-4006-92c7-2c39e6198b11/bin/utaipan/mathsat Starting monitored process 7 with mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with mathsat -unsat_core_generation=3 [2020-11-28 07:42:50,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 07:42:50,378 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 4 conjunts are in the unsatisfiable core [2020-11-28 07:42:50,379 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 07:42:50,404 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2020-11-28 07:42:50,404 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-28 07:42:50,507 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2020-11-28 07:42:50,507 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1457979521] [2020-11-28 07:42:50,507 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1243881368] [2020-11-28 07:42:50,507 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_db4baf74-9512-4006-92c7-2c39e6198b11/bin/utaipan/cvc4 Starting monitored process 8 with cvc4 --incremental --print-success --lang smt --rewrite-divk (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with cvc4 --incremental --print-success --lang smt --rewrite-divk [2020-11-28 07:42:50,646 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 07:42:50,649 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 4 conjunts are in the unsatisfiable core [2020-11-28 07:42:50,650 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 07:42:50,654 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2020-11-28 07:42:50,654 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-28 07:42:50,708 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2020-11-28 07:42:50,709 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1442279506] [2020-11-28 07:42:50,709 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_db4baf74-9512-4006-92c7-2c39e6198b11/bin/utaipan/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-28 07:42:50,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 07:42:50,792 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 4 conjunts are in the unsatisfiable core [2020-11-28 07:42:50,793 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 07:42:50,824 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2020-11-28 07:42:50,825 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-28 07:42:50,882 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2020-11-28 07:42:50,882 INFO L219 FreeRefinementEngine]: Constructing automaton from 2 perfect and 4 imperfect interpolant sequences. [2020-11-28 07:42:50,882 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [5, 6, 5, 5] total 13 [2020-11-28 07:42:50,883 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2005951577] [2020-11-28 07:42:50,883 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-11-28 07:42:50,883 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2020-11-28 07:42:50,884 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-11-28 07:42:50,884 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=110, Unknown=0, NotChecked=0, Total=156 [2020-11-28 07:42:50,885 INFO L87 Difference]: Start difference. First operand 33 states and 38 transitions. Second operand 6 states. [2020-11-28 07:42:50,977 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 07:42:50,978 INFO L93 Difference]: Finished difference Result 50 states and 58 transitions. [2020-11-28 07:42:50,979 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-11-28 07:42:50,979 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 32 [2020-11-28 07:42:50,979 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-28 07:42:50,979 INFO L225 Difference]: With dead ends: 50 [2020-11-28 07:42:50,979 INFO L226 Difference]: Without dead ends: 35 [2020-11-28 07:42:50,980 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 186 GetRequests, 174 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=46, Invalid=110, Unknown=0, NotChecked=0, Total=156 [2020-11-28 07:42:50,980 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-11-28 07:42:50,984 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2020-11-28 07:42:50,984 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-11-28 07:42:50,985 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 40 transitions. [2020-11-28 07:42:50,985 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 40 transitions. Word has length 32 [2020-11-28 07:42:50,986 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-28 07:42:50,986 INFO L481 AbstractCegarLoop]: Abstraction has 35 states and 40 transitions. [2020-11-28 07:42:50,986 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-11-28 07:42:50,986 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 40 transitions. [2020-11-28 07:42:50,987 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-11-28 07:42:50,987 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 07:42:50,988 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-28 07:42:51,602 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,7 mathsat -unsat_core_generation=3,8 cvc4 --incremental --print-success --lang smt --rewrite-divk [2020-11-28 07:42:51,603 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-28 07:42:51,603 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 07:42:51,604 INFO L82 PathProgramCache]: Analyzing trace with hash -2061676326, now seen corresponding path program 1 times [2020-11-28 07:42:51,604 INFO L162 FreeRefinementEngine]: Executing refinement strategy WALRUS [2020-11-28 07:42:51,604 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [371665585] [2020-11-28 07:42:51,604 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_db4baf74-9512-4006-92c7-2c39e6198b11/bin/utaipan/mathsat Starting monitored process 10 with mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with mathsat -unsat_core_generation=3 [2020-11-28 07:42:51,691 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 07:42:51,695 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 4 conjunts are in the unsatisfiable core [2020-11-28 07:42:51,697 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 07:42:51,722 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-11-28 07:42:51,722 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-28 07:42:51,875 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-11-28 07:42:51,876 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [371665585] [2020-11-28 07:42:51,876 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [7697355] [2020-11-28 07:42:51,876 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_db4baf74-9512-4006-92c7-2c39e6198b11/bin/utaipan/cvc4 Starting monitored process 11 with cvc4 --incremental --print-success --lang smt --rewrite-divk (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with cvc4 --incremental --print-success --lang smt --rewrite-divk [2020-11-28 07:42:52,033 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 07:42:52,035 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 4 conjunts are in the unsatisfiable core [2020-11-28 07:42:52,036 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 07:42:52,040 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-11-28 07:42:52,040 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-28 07:42:52,078 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-11-28 07:42:52,078 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1934711646] [2020-11-28 07:42:52,078 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_db4baf74-9512-4006-92c7-2c39e6198b11/bin/utaipan/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-28 07:42:52,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 07:42:52,162 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 4 conjunts are in the unsatisfiable core [2020-11-28 07:42:52,163 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 07:42:52,167 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-11-28 07:42:52,167 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-28 07:42:52,178 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-11-28 07:42:52,178 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2020-11-28 07:42:52,179 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 7, 5, 5, 5, 5] total 10 [2020-11-28 07:42:52,179 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [332863560] [2020-11-28 07:42:52,181 INFO L461 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-11-28 07:42:52,181 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2020-11-28 07:42:52,182 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-11-28 07:42:52,182 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=54, Unknown=0, NotChecked=0, Total=90 [2020-11-28 07:42:52,182 INFO L87 Difference]: Start difference. First operand 35 states and 40 transitions. Second operand 10 states. [2020-11-28 07:42:52,630 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 07:42:52,630 INFO L93 Difference]: Finished difference Result 108 states and 128 transitions. [2020-11-28 07:42:52,632 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-11-28 07:42:52,632 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 34 [2020-11-28 07:42:52,632 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-28 07:42:52,633 INFO L225 Difference]: With dead ends: 108 [2020-11-28 07:42:52,633 INFO L226 Difference]: Without dead ends: 80 [2020-11-28 07:42:52,634 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 199 GetRequests, 189 SyntacticMatches, 1 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 2 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=44, Invalid=66, Unknown=0, NotChecked=0, Total=110 [2020-11-28 07:42:52,635 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2020-11-28 07:42:52,641 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 47. [2020-11-28 07:42:52,641 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-11-28 07:42:52,642 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 52 transitions. [2020-11-28 07:42:52,642 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 52 transitions. Word has length 34 [2020-11-28 07:42:52,642 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-28 07:42:52,642 INFO L481 AbstractCegarLoop]: Abstraction has 47 states and 52 transitions. [2020-11-28 07:42:52,642 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-11-28 07:42:52,642 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 52 transitions. [2020-11-28 07:42:52,643 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-11-28 07:42:52,644 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 07:42:52,644 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-28 07:42:53,254 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,10 mathsat -unsat_core_generation=3,11 cvc4 --incremental --print-success --lang smt --rewrite-divk [2020-11-28 07:42:53,255 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-28 07:42:53,255 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 07:42:53,255 INFO L82 PathProgramCache]: Analyzing trace with hash 1658933818, now seen corresponding path program 2 times [2020-11-28 07:42:53,256 INFO L162 FreeRefinementEngine]: Executing refinement strategy WALRUS [2020-11-28 07:42:53,256 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [399130365] [2020-11-28 07:42:53,256 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_db4baf74-9512-4006-92c7-2c39e6198b11/bin/utaipan/mathsat Starting monitored process 13 with mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with mathsat -unsat_core_generation=3 [2020-11-28 07:42:53,439 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-11-28 07:42:53,439 INFO L229 tOrderPrioritization]: Conjunction of SSA is sat [2020-11-28 07:42:53,439 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-28 07:42:53,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-28 07:42:53,579 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-28 07:42:53,642 INFO L173 FreeRefinementEngine]: Strategy WALRUS found a feasible trace [2020-11-28 07:42:53,642 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-11-28 07:42:53,852 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 mathsat -unsat_core_generation=3 [2020-11-28 07:42:53,913 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 28.11 07:42:53 BoogieIcfgContainer [2020-11-28 07:42:53,914 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-11-28 07:42:53,915 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-11-28 07:42:53,925 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-11-28 07:42:53,925 INFO L275 PluginConnector]: Witness Printer initialized [2020-11-28 07:42:53,925 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.11 07:42:46" (3/4) ... [2020-11-28 07:42:53,927 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2020-11-28 07:42:53,993 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/run_dir_db4baf74-9512-4006-92c7-2c39e6198b11/bin/utaipan/witness.graphml [2020-11-28 07:42:53,993 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-11-28 07:42:53,995 INFO L168 Benchmark]: Toolchain (without parser) took 8157.89 ms. Allocated memory was 50.3 MB in the beginning and 73.4 MB in the end (delta: 23.1 MB). Free memory was 27.0 MB in the beginning and 40.3 MB in the end (delta: -13.3 MB). Peak memory consumption was 9.2 MB. Max. memory is 16.1 GB. [2020-11-28 07:42:53,996 INFO L168 Benchmark]: CDTParser took 0.35 ms. Allocated memory is still 50.3 MB. Free memory was 32.2 MB in the beginning and 32.2 MB in the end (delta: 25.1 kB). There was no memory consumed. Max. memory is 16.1 GB. [2020-11-28 07:42:53,997 INFO L168 Benchmark]: CACSL2BoogieTranslator took 326.63 ms. Allocated memory was 50.3 MB in the beginning and 60.8 MB in the end (delta: 10.5 MB). Free memory was 26.9 MB in the beginning and 42.9 MB in the end (delta: -16.0 MB). Peak memory consumption was 7.4 MB. Max. memory is 16.1 GB. [2020-11-28 07:42:53,997 INFO L168 Benchmark]: Boogie Procedure Inliner took 42.40 ms. Allocated memory is still 60.8 MB. Free memory was 42.9 MB in the beginning and 41.3 MB in the end (delta: 1.6 MB). There was no memory consumed. Max. memory is 16.1 GB. [2020-11-28 07:42:53,998 INFO L168 Benchmark]: Boogie Preprocessor took 32.49 ms. Allocated memory is still 60.8 MB. Free memory was 41.3 MB in the beginning and 39.8 MB in the end (delta: 1.5 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-11-28 07:42:53,999 INFO L168 Benchmark]: RCFGBuilder took 707.17 ms. Allocated memory is still 60.8 MB. Free memory was 39.6 MB in the beginning and 35.4 MB in the end (delta: 4.2 MB). Peak memory consumption was 14.0 MB. Max. memory is 16.1 GB. [2020-11-28 07:42:53,999 INFO L168 Benchmark]: TraceAbstraction took 6959.42 ms. Allocated memory was 60.8 MB in the beginning and 73.4 MB in the end (delta: 12.6 MB). Free memory was 34.9 MB in the beginning and 44.0 MB in the end (delta: -9.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-11-28 07:42:54,000 INFO L168 Benchmark]: Witness Printer took 78.41 ms. Allocated memory is still 73.4 MB. Free memory was 44.0 MB in the beginning and 40.3 MB in the end (delta: 3.7 MB). Peak memory consumption was 4.2 MB. Max. memory is 16.1 GB. [2020-11-28 07:42:54,003 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.35 ms. Allocated memory is still 50.3 MB. Free memory was 32.2 MB in the beginning and 32.2 MB in the end (delta: 25.1 kB). There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 326.63 ms. Allocated memory was 50.3 MB in the beginning and 60.8 MB in the end (delta: 10.5 MB). Free memory was 26.9 MB in the beginning and 42.9 MB in the end (delta: -16.0 MB). Peak memory consumption was 7.4 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 42.40 ms. Allocated memory is still 60.8 MB. Free memory was 42.9 MB in the beginning and 41.3 MB in the end (delta: 1.6 MB). There was no memory consumed. Max. memory is 16.1 GB. * Boogie Preprocessor took 32.49 ms. Allocated memory is still 60.8 MB. Free memory was 41.3 MB in the beginning and 39.8 MB in the end (delta: 1.5 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * RCFGBuilder took 707.17 ms. Allocated memory is still 60.8 MB. Free memory was 39.6 MB in the beginning and 35.4 MB in the end (delta: 4.2 MB). Peak memory consumption was 14.0 MB. Max. memory is 16.1 GB. * TraceAbstraction took 6959.42 ms. Allocated memory was 60.8 MB in the beginning and 73.4 MB in the end (delta: 12.6 MB). Free memory was 34.9 MB in the beginning and 44.0 MB in the end (delta: -9.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Witness Printer took 78.41 ms. Allocated memory is still 73.4 MB. Free memory was 44.0 MB in the beginning and 40.3 MB in the end (delta: 3.7 MB). Peak memory consumption was 4.2 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 12]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L31] char string_A[5], string_B[5]; [L32] int i, j, nc_A, nc_B, found=0; [L35] i=0 [L35] COND TRUE i<5 [L36] string_A[i]=__VERIFIER_nondet_char() [L35] i++ [L35] COND TRUE i<5 [L36] string_A[i]=__VERIFIER_nondet_char() [L35] i++ [L35] COND TRUE i<5 [L36] string_A[i]=__VERIFIER_nondet_char() [L35] i++ [L35] COND TRUE i<5 [L36] string_A[i]=__VERIFIER_nondet_char() [L35] i++ [L35] COND TRUE i<5 [L36] string_A[i]=__VERIFIER_nondet_char() [L35] i++ [L35] COND FALSE !(i<5) [L37] EXPR string_A[5 -1] [L37] COND FALSE !(!(string_A[5 -1]=='\0')) [L39] i=0 [L39] COND TRUE i<5 [L40] string_B[i]=__VERIFIER_nondet_char() [L39] i++ [L39] COND TRUE i<5 [L40] string_B[i]=__VERIFIER_nondet_char() [L39] i++ [L39] COND TRUE i<5 [L40] string_B[i]=__VERIFIER_nondet_char() [L39] i++ [L39] COND TRUE i<5 [L40] string_B[i]=__VERIFIER_nondet_char() [L39] i++ [L39] COND TRUE i<5 [L40] string_B[i]=__VERIFIER_nondet_char() [L39] i++ [L39] COND FALSE !(i<5) [L41] EXPR string_B[5 -1] [L41] COND FALSE !(!(string_B[5 -1]=='\0')) [L43] nc_A = 0 [L44] EXPR string_A[nc_A] [L44] COND TRUE string_A[nc_A]!='\0' [L45] nc_A++ [L44] EXPR string_A[nc_A] [L44] COND FALSE !(string_A[nc_A]!='\0') [L47] nc_B = 0 [L48] EXPR string_B[nc_B] [L48] COND TRUE string_B[nc_B]!='\0' [L49] nc_B++ [L48] EXPR string_B[nc_B] [L48] COND FALSE !(string_B[nc_B]!='\0') [L51] COND FALSE !(!(nc_B >= nc_A)) [L54] EXPR j=0 [L54] i=j=0 [L55] COND TRUE (inc_B-1)<