./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loops/invert_string-1.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version a4ecdabc Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/run_dir_42c39fdd-578f-44ab-b9a2-0f3482a75e7e/bin/utaipan/data/config -Xmx15G -Xms4m -jar /tmp/vcloud-vcloud-master/worker/run_dir_42c39fdd-578f-44ab-b9a2-0f3482a75e7e/bin/utaipan/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_42c39fdd-578f-44ab-b9a2-0f3482a75e7e/bin/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_42c39fdd-578f-44ab-b9a2-0f3482a75e7e/bin/utaipan/config/TaipanReach.xml -i ../../sv-benchmarks/c/loops/invert_string-1.c -s /tmp/vcloud-vcloud-master/worker/run_dir_42c39fdd-578f-44ab-b9a2-0f3482a75e7e/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_42c39fdd-578f-44ab-b9a2-0f3482a75e7e/bin/utaipan --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 1b9a71645175fee79e6d6cd797db38ce6044ffb9 .......................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... Execution finished normally Writing output log to file Ultimate.log Writing human readable error path to file UltimateCounterExample.errorpath Result: FALSE --- Real Ultimate output --- This is Ultimate 0.2.0-a4ecdab [2020-11-22 12:57:43,668 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-11-22 12:57:43,671 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-11-22 12:57:43,738 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-11-22 12:57:43,739 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-11-22 12:57:43,745 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-11-22 12:57:43,748 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-11-22 12:57:43,753 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-11-22 12:57:43,756 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-11-22 12:57:43,763 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-11-22 12:57:43,765 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-11-22 12:57:43,767 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-11-22 12:57:43,768 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-11-22 12:57:43,771 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-11-22 12:57:43,773 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-11-22 12:57:43,775 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-11-22 12:57:43,777 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-11-22 12:57:43,782 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-11-22 12:57:43,786 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-11-22 12:57:43,793 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-11-22 12:57:43,795 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-11-22 12:57:43,797 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-11-22 12:57:43,800 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-11-22 12:57:43,801 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-11-22 12:57:43,807 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-11-22 12:57:43,807 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-11-22 12:57:43,808 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-11-22 12:57:43,811 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-11-22 12:57:43,811 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-11-22 12:57:43,813 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-11-22 12:57:43,814 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-11-22 12:57:43,815 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-11-22 12:57:43,817 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-11-22 12:57:43,819 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-11-22 12:57:43,820 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-11-22 12:57:43,821 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-11-22 12:57:43,822 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-11-22 12:57:43,822 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-11-22 12:57:43,822 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-11-22 12:57:43,823 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-11-22 12:57:43,824 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-11-22 12:57:43,828 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/run_dir_42c39fdd-578f-44ab-b9a2-0f3482a75e7e/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf [2020-11-22 12:57:43,873 INFO L113 SettingsManager]: Loading preferences was successful [2020-11-22 12:57:43,876 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-11-22 12:57:43,877 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2020-11-22 12:57:43,878 INFO L138 SettingsManager]: * User list type=DISABLED [2020-11-22 12:57:43,878 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2020-11-22 12:57:43,878 INFO L138 SettingsManager]: * Explicit value domain=true [2020-11-22 12:57:43,879 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2020-11-22 12:57:43,879 INFO L138 SettingsManager]: * Octagon Domain=false [2020-11-22 12:57:43,879 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2020-11-22 12:57:43,879 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2020-11-22 12:57:43,880 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2020-11-22 12:57:43,881 INFO L138 SettingsManager]: * Interval Domain=false [2020-11-22 12:57:43,881 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2020-11-22 12:57:43,881 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2020-11-22 12:57:43,882 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2020-11-22 12:57:43,882 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-11-22 12:57:43,883 INFO L138 SettingsManager]: * sizeof long=4 [2020-11-22 12:57:43,883 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-11-22 12:57:43,883 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-11-22 12:57:43,883 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-11-22 12:57:43,884 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-11-22 12:57:43,884 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-11-22 12:57:43,884 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-11-22 12:57:43,884 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2020-11-22 12:57:43,885 INFO L138 SettingsManager]: * sizeof long double=12 [2020-11-22 12:57:43,885 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-11-22 12:57:43,885 INFO L138 SettingsManager]: * Use constant arrays=true [2020-11-22 12:57:43,885 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-11-22 12:57:43,886 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-11-22 12:57:43,886 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-11-22 12:57:43,886 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-11-22 12:57:43,886 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-11-22 12:57:43,887 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-11-22 12:57:43,887 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-11-22 12:57:43,887 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-11-22 12:57:43,888 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2020-11-22 12:57:43,888 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-11-22 12:57:43,888 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-11-22 12:57:43,888 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-11-22 12:57:43,889 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2020-11-22 12:57:43,889 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_42c39fdd-578f-44ab-b9a2-0f3482a75e7e/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud-vcloud-master/worker/run_dir_42c39fdd-578f-44ab-b9a2-0f3482a75e7e/bin/utaipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 1b9a71645175fee79e6d6cd797db38ce6044ffb9 [2020-11-22 12:57:44,159 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-11-22 12:57:44,195 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-11-22 12:57:44,198 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-11-22 12:57:44,202 INFO L271 PluginConnector]: Initializing CDTParser... [2020-11-22 12:57:44,202 INFO L275 PluginConnector]: CDTParser initialized [2020-11-22 12:57:44,203 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_42c39fdd-578f-44ab-b9a2-0f3482a75e7e/bin/utaipan/../../sv-benchmarks/c/loops/invert_string-1.c [2020-11-22 12:57:44,282 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_42c39fdd-578f-44ab-b9a2-0f3482a75e7e/bin/utaipan/data/10e3a1903/a8feb03f425c4b44b78f19a1a03e9de9/FLAG9c9ba734c [2020-11-22 12:57:44,911 INFO L306 CDTParser]: Found 1 translation units. [2020-11-22 12:57:44,912 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_42c39fdd-578f-44ab-b9a2-0f3482a75e7e/sv-benchmarks/c/loops/invert_string-1.c [2020-11-22 12:57:44,924 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_42c39fdd-578f-44ab-b9a2-0f3482a75e7e/bin/utaipan/data/10e3a1903/a8feb03f425c4b44b78f19a1a03e9de9/FLAG9c9ba734c [2020-11-22 12:57:45,267 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_42c39fdd-578f-44ab-b9a2-0f3482a75e7e/bin/utaipan/data/10e3a1903/a8feb03f425c4b44b78f19a1a03e9de9 [2020-11-22 12:57:45,270 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-11-22 12:57:45,271 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-11-22 12:57:45,273 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-11-22 12:57:45,273 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-11-22 12:57:45,278 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-11-22 12:57:45,280 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.11 12:57:45" (1/1) ... [2020-11-22 12:57:45,282 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4fe194d3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 12:57:45, skipping insertion in model container [2020-11-22 12:57:45,282 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.11 12:57:45" (1/1) ... [2020-11-22 12:57:45,291 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-11-22 12:57:45,306 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-11-22 12:57:45,581 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-22 12:57:45,589 INFO L203 MainTranslator]: Completed pre-run [2020-11-22 12:57:45,628 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-22 12:57:45,644 INFO L208 MainTranslator]: Completed translation [2020-11-22 12:57:45,645 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 12:57:45 WrapperNode [2020-11-22 12:57:45,645 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-11-22 12:57:45,647 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-11-22 12:57:45,647 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-11-22 12:57:45,647 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-11-22 12:57:45,654 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 12:57:45" (1/1) ... [2020-11-22 12:57:45,663 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 12:57:45" (1/1) ... [2020-11-22 12:57:45,688 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-11-22 12:57:45,689 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-11-22 12:57:45,689 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-11-22 12:57:45,690 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-11-22 12:57:45,698 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 12:57:45" (1/1) ... [2020-11-22 12:57:45,699 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 12:57:45" (1/1) ... [2020-11-22 12:57:45,710 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 12:57:45" (1/1) ... [2020-11-22 12:57:45,712 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 12:57:45" (1/1) ... [2020-11-22 12:57:45,722 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 12:57:45" (1/1) ... [2020-11-22 12:57:45,731 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 12:57:45" (1/1) ... [2020-11-22 12:57:45,733 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 12:57:45" (1/1) ... [2020-11-22 12:57:45,736 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-11-22 12:57:45,741 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-11-22 12:57:45,741 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-11-22 12:57:45,743 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-11-22 12:57:45,744 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 12:57:45" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_42c39fdd-578f-44ab-b9a2-0f3482a75e7e/bin/utaipan/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-11-22 12:57:45,828 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-11-22 12:57:45,828 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-11-22 12:57:45,828 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-11-22 12:57:45,829 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-11-22 12:57:45,829 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-11-22 12:57:45,829 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-11-22 12:57:45,829 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-11-22 12:57:46,497 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-11-22 12:57:46,498 INFO L298 CfgBuilder]: Removed 11 assume(true) statements. [2020-11-22 12:57:46,500 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.11 12:57:46 BoogieIcfgContainer [2020-11-22 12:57:46,500 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-11-22 12:57:46,501 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-11-22 12:57:46,502 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-11-22 12:57:46,506 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-11-22 12:57:46,507 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.11 12:57:45" (1/3) ... [2020-11-22 12:57:46,508 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@71518317 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.11 12:57:46, skipping insertion in model container [2020-11-22 12:57:46,508 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 12:57:45" (2/3) ... [2020-11-22 12:57:46,509 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@71518317 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.11 12:57:46, skipping insertion in model container [2020-11-22 12:57:46,509 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.11 12:57:46" (3/3) ... [2020-11-22 12:57:46,511 INFO L111 eAbstractionObserver]: Analyzing ICFG invert_string-1.c [2020-11-22 12:57:46,521 INFO L164 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-11-22 12:57:46,526 INFO L176 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-11-22 12:57:46,537 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-11-22 12:57:46,575 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-11-22 12:57:46,575 INFO L378 AbstractCegarLoop]: Hoare is true [2020-11-22 12:57:46,575 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-11-22 12:57:46,575 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-11-22 12:57:46,575 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-11-22 12:57:46,575 INFO L382 AbstractCegarLoop]: Difference is false [2020-11-22 12:57:46,576 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-11-22 12:57:46,576 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-11-22 12:57:46,588 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states. [2020-11-22 12:57:46,595 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2020-11-22 12:57:46,596 INFO L414 BasicCegarLoop]: Found error trace [2020-11-22 12:57:46,597 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2020-11-22 12:57:46,597 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-22 12:57:46,603 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-22 12:57:46,604 INFO L82 PathProgramCache]: Analyzing trace with hash -1009541242, now seen corresponding path program 1 times [2020-11-22 12:57:46,614 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-22 12:57:46,614 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1465225430] [2020-11-22 12:57:46,615 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-22 12:57:46,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 12:57:46,825 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-22 12:57:46,826 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1465225430] [2020-11-22 12:57:46,826 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-22 12:57:46,827 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-11-22 12:57:46,827 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [987555353] [2020-11-22 12:57:46,833 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-11-22 12:57:46,833 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-22 12:57:46,848 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-11-22 12:57:46,849 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-11-22 12:57:46,851 INFO L87 Difference]: Start difference. First operand 9 states. Second operand 3 states. [2020-11-22 12:57:46,896 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-22 12:57:46,897 INFO L93 Difference]: Finished difference Result 17 states and 23 transitions. [2020-11-22 12:57:46,897 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-11-22 12:57:46,899 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 6 [2020-11-22 12:57:46,899 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-22 12:57:46,908 INFO L225 Difference]: With dead ends: 17 [2020-11-22 12:57:46,908 INFO L226 Difference]: Without dead ends: 9 [2020-11-22 12:57:46,911 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-11-22 12:57:46,930 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2020-11-22 12:57:46,943 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 9. [2020-11-22 12:57:46,944 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 9 states. [2020-11-22 12:57:46,945 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 11 transitions. [2020-11-22 12:57:46,946 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 11 transitions. Word has length 6 [2020-11-22 12:57:46,947 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-22 12:57:46,947 INFO L481 AbstractCegarLoop]: Abstraction has 9 states and 11 transitions. [2020-11-22 12:57:46,947 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-11-22 12:57:46,947 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 11 transitions. [2020-11-22 12:57:46,948 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2020-11-22 12:57:46,948 INFO L414 BasicCegarLoop]: Found error trace [2020-11-22 12:57:46,948 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2020-11-22 12:57:46,948 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-11-22 12:57:46,948 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-22 12:57:46,949 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-22 12:57:46,949 INFO L82 PathProgramCache]: Analyzing trace with hash -1481284516, now seen corresponding path program 1 times [2020-11-22 12:57:46,950 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-22 12:57:46,950 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1903134775] [2020-11-22 12:57:46,950 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-22 12:57:46,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 12:57:47,014 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-11-22 12:57:47,014 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1903134775] [2020-11-22 12:57:47,015 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-22 12:57:47,015 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-11-22 12:57:47,015 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [569709984] [2020-11-22 12:57:47,016 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-11-22 12:57:47,016 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-22 12:57:47,017 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-11-22 12:57:47,018 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-11-22 12:57:47,018 INFO L87 Difference]: Start difference. First operand 9 states and 11 transitions. Second operand 4 states. [2020-11-22 12:57:47,067 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-22 12:57:47,067 INFO L93 Difference]: Finished difference Result 15 states and 18 transitions. [2020-11-22 12:57:47,068 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-11-22 12:57:47,068 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 7 [2020-11-22 12:57:47,068 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-22 12:57:47,069 INFO L225 Difference]: With dead ends: 15 [2020-11-22 12:57:47,069 INFO L226 Difference]: Without dead ends: 10 [2020-11-22 12:57:47,070 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-11-22 12:57:47,070 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10 states. [2020-11-22 12:57:47,072 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10 to 10. [2020-11-22 12:57:47,072 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 10 states. [2020-11-22 12:57:47,073 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 12 transitions. [2020-11-22 12:57:47,073 INFO L78 Accepts]: Start accepts. Automaton has 10 states and 12 transitions. Word has length 7 [2020-11-22 12:57:47,073 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-22 12:57:47,074 INFO L481 AbstractCegarLoop]: Abstraction has 10 states and 12 transitions. [2020-11-22 12:57:47,074 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-11-22 12:57:47,074 INFO L276 IsEmpty]: Start isEmpty. Operand 10 states and 12 transitions. [2020-11-22 12:57:47,074 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2020-11-22 12:57:47,074 INFO L414 BasicCegarLoop]: Found error trace [2020-11-22 12:57:47,074 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2020-11-22 12:57:47,075 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-11-22 12:57:47,075 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-22 12:57:47,075 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-22 12:57:47,075 INFO L82 PathProgramCache]: Analyzing trace with hash 1320199760, now seen corresponding path program 1 times [2020-11-22 12:57:47,076 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-22 12:57:47,076 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [521398630] [2020-11-22 12:57:47,076 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-22 12:57:47,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 12:57:47,634 WARN L193 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 26 [2020-11-22 12:57:47,654 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-22 12:57:47,654 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [521398630] [2020-11-22 12:57:47,655 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1998834110] [2020-11-22 12:57:47,655 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_42c39fdd-578f-44ab-b9a2-0f3482a75e7e/bin/utaipan/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-22 12:57:47,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 12:57:47,741 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 19 conjunts are in the unsatisfiable core [2020-11-22 12:57:47,747 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-22 12:57:47,836 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 238 treesize of output 222 [2020-11-22 12:57:47,847 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 2 xjuncts. [2020-11-22 12:57:47,939 INFO L625 ElimStorePlain]: treesize reduction 172, result has 11.8 percent of original size [2020-11-22 12:57:47,957 INFO L545 ElimStorePlain]: Start of recursive call 1: 3 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2020-11-22 12:57:47,957 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 4 variables, input treesize:27, output treesize:11 [2020-11-22 12:57:48,123 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 15 [2020-11-22 12:57:48,124 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-11-22 12:57:48,138 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-11-22 12:57:48,138 INFO L545 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-11-22 12:57:48,139 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:26, output treesize:22 [2020-11-22 12:57:48,371 WARN L193 SmtUtils]: Spent 145.00 ms on a formula simplification that was a NOOP. DAG size: 21 [2020-11-22 12:57:48,425 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-22 12:57:48,435 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-22 12:57:48,440 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-22 12:57:48,445 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-22 12:57:48,453 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-22 12:57:48,458 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-22 12:57:48,464 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-22 12:57:48,469 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-22 12:57:48,584 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-22 12:57:48,585 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-22 12:57:48,617 INFO L603 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-11-22 12:57:48,707 INFO L350 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2020-11-22 12:57:48,707 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 26 [2020-11-22 12:57:48,708 INFO L603 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-11-22 12:57:48,713 INFO L441 ElimStorePlain]: Different costs {0=[v_arrayElimCell_4], 1=[v_arrayElimCell_3]} [2020-11-22 12:57:48,722 WARN L838 $PredicateComparison]: unable to prove that (forall ((|#memory_int| (Array Int (Array Int Int))) (|ULTIMATE.start_main_~#str1~0.offset| Int) (|ULTIMATE.start_main_~#str2~0.offset| Int)) (let ((.cse0 (store (select |#memory_int| |c_ULTIMATE.start_main_~#str2~0.base|) (+ |ULTIMATE.start_main_~#str2~0.offset| c_ULTIMATE.start_main_~j~0) (select (select |#memory_int| |c_ULTIMATE.start_main_~#str1~0.base|) |ULTIMATE.start_main_~#str1~0.offset|)))) (= (select (select (store |#memory_int| |c_ULTIMATE.start_main_~#str2~0.base| .cse0) |c_ULTIMATE.start_main_~#str1~0.base|) |ULTIMATE.start_main_~#str1~0.offset|) (select .cse0 (+ c_ULTIMATE.start_main_~MAX~0 |ULTIMATE.start_main_~#str2~0.offset| (- 1)))))) is different from false [2020-11-22 12:57:48,774 INFO L350 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2020-11-22 12:57:48,774 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 21 treesize of output 24 [2020-11-22 12:57:48,775 INFO L603 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-11-22 12:57:48,784 INFO L441 ElimStorePlain]: Different costs {0=[v_arrayElimCell_6], 1=[v_arrayElimCell_5]} [2020-11-22 12:57:48,888 INFO L350 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2020-11-22 12:57:48,889 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 21 treesize of output 24 [2020-11-22 12:57:48,890 INFO L603 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-11-22 12:57:48,896 INFO L441 ElimStorePlain]: Different costs {0=[v_arrayElimCell_8], 1=[v_arrayElimCell_7]} [2020-11-22 12:57:48,970 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 1 not checked. [2020-11-22 12:57:48,970 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [818335889] [2020-11-22 12:57:49,004 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2020-11-22 12:57:49,005 INFO L166 IcfgInterpreter]: Building call graph [2020-11-22 12:57:49,011 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-11-22 12:57:49,018 INFO L176 IcfgInterpreter]: Starting interpretation [2020-11-22 12:57:49,019 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-11-22 12:57:49,247 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-11-22 12:57:49,552 WARN L193 SmtUtils]: Spent 179.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 49 [2020-11-22 12:57:50,166 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 159 [2020-11-22 12:57:50,473 INFO L180 IcfgInterpreter]: Interpretation finished [2020-11-22 12:57:50,757 WARN L193 SmtUtils]: Spent 235.00 ms on a formula simplification. DAG size of input: 75 DAG size of output: 59 [2020-11-22 12:57:50,965 WARN L193 SmtUtils]: Spent 168.00 ms on a formula simplification. DAG size of input: 52 DAG size of output: 37 [2020-11-22 12:57:51,217 WARN L193 SmtUtils]: Spent 210.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 43 [2020-11-22 12:57:51,437 WARN L193 SmtUtils]: Spent 168.00 ms on a formula simplification. DAG size of input: 56 DAG size of output: 41 [2020-11-22 12:57:51,675 WARN L193 SmtUtils]: Spent 165.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 58 [2020-11-22 12:57:51,678 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-11-22 12:57:51,679 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-22 12:57:51,679 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 18 [2020-11-22 12:57:51,679 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1338789094] [2020-11-22 12:57:51,680 INFO L461 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-11-22 12:57:51,680 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-22 12:57:51,680 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-11-22 12:57:51,682 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=426, Unknown=1, NotChecked=42, Total=552 [2020-11-22 12:57:51,682 INFO L87 Difference]: Start difference. First operand 10 states and 12 transitions. Second operand 19 states. [2020-11-22 12:57:52,376 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-22 12:57:52,376 INFO L93 Difference]: Finished difference Result 25 states and 29 transitions. [2020-11-22 12:57:52,376 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-11-22 12:57:52,377 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 8 [2020-11-22 12:57:52,377 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-22 12:57:52,377 INFO L225 Difference]: With dead ends: 25 [2020-11-22 12:57:52,377 INFO L226 Difference]: Without dead ends: 23 [2020-11-22 12:57:52,378 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 6 SyntacticMatches, 1 SemanticMatches, 30 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 131 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=190, Invalid=743, Unknown=1, NotChecked=58, Total=992 [2020-11-22 12:57:52,378 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-11-22 12:57:52,385 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 15. [2020-11-22 12:57:52,386 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-11-22 12:57:52,386 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 19 transitions. [2020-11-22 12:57:52,386 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 19 transitions. Word has length 8 [2020-11-22 12:57:52,387 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-22 12:57:52,387 INFO L481 AbstractCegarLoop]: Abstraction has 15 states and 19 transitions. [2020-11-22 12:57:52,387 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-11-22 12:57:52,387 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 19 transitions. [2020-11-22 12:57:52,387 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2020-11-22 12:57:52,387 INFO L414 BasicCegarLoop]: Found error trace [2020-11-22 12:57:52,388 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1] [2020-11-22 12:57:52,588 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2020-11-22 12:57:52,588 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-22 12:57:52,589 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-22 12:57:52,589 INFO L82 PathProgramCache]: Analyzing trace with hash -1053520474, now seen corresponding path program 2 times [2020-11-22 12:57:52,589 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-22 12:57:52,590 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1722889200] [2020-11-22 12:57:52,590 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-22 12:57:52,624 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 12:57:52,673 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-22 12:57:52,674 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1722889200] [2020-11-22 12:57:52,674 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [327612993] [2020-11-22 12:57:52,674 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_42c39fdd-578f-44ab-b9a2-0f3482a75e7e/bin/utaipan/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-22 12:57:52,722 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2020-11-22 12:57:52,722 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-22 12:57:52,723 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 6 conjunts are in the unsatisfiable core [2020-11-22 12:57:52,724 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-22 12:57:52,745 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-22 12:57:52,745 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-22 12:57:52,750 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-22 12:57:52,750 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [342545523] [2020-11-22 12:57:52,753 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2020-11-22 12:57:52,753 INFO L166 IcfgInterpreter]: Building call graph [2020-11-22 12:57:52,753 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-11-22 12:57:52,753 INFO L176 IcfgInterpreter]: Starting interpretation [2020-11-22 12:57:52,754 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-11-22 12:57:52,849 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-11-22 12:57:53,185 WARN L193 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 49 [2020-11-22 12:57:53,666 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 163 [2020-11-22 12:57:53,970 INFO L180 IcfgInterpreter]: Interpretation finished [2020-11-22 12:57:54,218 WARN L193 SmtUtils]: Spent 233.00 ms on a formula simplification. DAG size of input: 75 DAG size of output: 59 [2020-11-22 12:57:54,397 WARN L193 SmtUtils]: Spent 159.00 ms on a formula simplification. DAG size of input: 52 DAG size of output: 37 [2020-11-22 12:57:54,575 WARN L193 SmtUtils]: Spent 163.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 43 [2020-11-22 12:57:54,761 WARN L193 SmtUtils]: Spent 163.00 ms on a formula simplification. DAG size of input: 56 DAG size of output: 41 [2020-11-22 12:57:55,060 WARN L193 SmtUtils]: Spent 268.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 58 [2020-11-22 12:57:55,061 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-11-22 12:57:55,061 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-22 12:57:55,061 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 4 [2020-11-22 12:57:55,061 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2136531339] [2020-11-22 12:57:55,061 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-11-22 12:57:55,062 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-22 12:57:55,062 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-11-22 12:57:55,062 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2020-11-22 12:57:55,062 INFO L87 Difference]: Start difference. First operand 15 states and 19 transitions. Second operand 5 states. [2020-11-22 12:57:55,248 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-22 12:57:55,248 INFO L93 Difference]: Finished difference Result 28 states and 33 transitions. [2020-11-22 12:57:55,249 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-11-22 12:57:55,249 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 9 [2020-11-22 12:57:55,249 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-22 12:57:55,250 INFO L225 Difference]: With dead ends: 28 [2020-11-22 12:57:55,250 INFO L226 Difference]: Without dead ends: 23 [2020-11-22 12:57:55,250 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 22 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=40, Invalid=92, Unknown=0, NotChecked=0, Total=132 [2020-11-22 12:57:55,251 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-11-22 12:57:55,259 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 16. [2020-11-22 12:57:55,260 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-11-22 12:57:55,260 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 20 transitions. [2020-11-22 12:57:55,260 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 20 transitions. Word has length 9 [2020-11-22 12:57:55,261 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-22 12:57:55,261 INFO L481 AbstractCegarLoop]: Abstraction has 16 states and 20 transitions. [2020-11-22 12:57:55,261 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-11-22 12:57:55,261 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 20 transitions. [2020-11-22 12:57:55,261 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-11-22 12:57:55,262 INFO L414 BasicCegarLoop]: Found error trace [2020-11-22 12:57:55,262 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1] [2020-11-22 12:57:55,462 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable33 [2020-11-22 12:57:55,462 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-22 12:57:55,463 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-22 12:57:55,463 INFO L82 PathProgramCache]: Analyzing trace with hash 1695983174, now seen corresponding path program 3 times [2020-11-22 12:57:55,463 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-22 12:57:55,463 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1519538268] [2020-11-22 12:57:55,463 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-22 12:57:55,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 12:57:55,818 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-22 12:57:55,818 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1519538268] [2020-11-22 12:57:55,819 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [610319187] [2020-11-22 12:57:55,819 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_42c39fdd-578f-44ab-b9a2-0f3482a75e7e/bin/utaipan/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-22 12:57:55,862 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-11-22 12:57:55,862 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-22 12:57:55,864 WARN L261 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 24 conjunts are in the unsatisfiable core [2020-11-22 12:57:55,865 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-22 12:57:56,220 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-11-22 12:57:56,221 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-22 12:57:56,469 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-11-22 12:57:56,470 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [211437430] [2020-11-22 12:57:56,472 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2020-11-22 12:57:56,472 INFO L166 IcfgInterpreter]: Building call graph [2020-11-22 12:57:56,472 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-11-22 12:57:56,473 INFO L176 IcfgInterpreter]: Starting interpretation [2020-11-22 12:57:56,473 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-11-22 12:57:56,574 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-11-22 12:57:56,793 WARN L193 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 49 [2020-11-22 12:57:57,512 INFO L180 IcfgInterpreter]: Interpretation finished [2020-11-22 12:57:57,788 WARN L193 SmtUtils]: Spent 220.00 ms on a formula simplification. DAG size of input: 75 DAG size of output: 59 [2020-11-22 12:57:57,997 WARN L193 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 52 DAG size of output: 37 [2020-11-22 12:57:58,218 WARN L193 SmtUtils]: Spent 164.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 43 [2020-11-22 12:57:58,433 WARN L193 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 56 DAG size of output: 41 [2020-11-22 12:57:58,719 WARN L193 SmtUtils]: Spent 213.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 58 [2020-11-22 12:57:58,720 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-11-22 12:57:58,720 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-22 12:57:58,720 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 7, 7] total 19 [2020-11-22 12:57:58,720 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [766133197] [2020-11-22 12:57:58,721 INFO L461 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-11-22 12:57:58,721 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-22 12:57:58,721 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-11-22 12:57:58,722 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=468, Unknown=0, NotChecked=0, Total=552 [2020-11-22 12:57:58,722 INFO L87 Difference]: Start difference. First operand 16 states and 20 transitions. Second operand 19 states. [2020-11-22 12:57:58,957 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 48 DAG size of output: 47 [2020-11-22 12:58:00,610 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 42 DAG size of output: 41 [2020-11-22 12:58:01,115 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 45 DAG size of output: 44 [2020-11-22 12:58:01,536 WARN L193 SmtUtils]: Spent 218.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 49 [2020-11-22 12:58:02,103 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-22 12:58:02,103 INFO L93 Difference]: Finished difference Result 80 states and 97 transitions. [2020-11-22 12:58:02,103 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-11-22 12:58:02,103 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 10 [2020-11-22 12:58:02,104 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-22 12:58:02,105 INFO L225 Difference]: With dead ends: 80 [2020-11-22 12:58:02,105 INFO L226 Difference]: Without dead ends: 78 [2020-11-22 12:58:02,107 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 505 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=529, Invalid=2332, Unknown=1, NotChecked=0, Total=2862 [2020-11-22 12:58:02,107 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-11-22 12:58:02,117 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 21. [2020-11-22 12:58:02,117 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-11-22 12:58:02,118 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 29 transitions. [2020-11-22 12:58:02,118 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 29 transitions. Word has length 10 [2020-11-22 12:58:02,118 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-22 12:58:02,118 INFO L481 AbstractCegarLoop]: Abstraction has 21 states and 29 transitions. [2020-11-22 12:58:02,118 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-11-22 12:58:02,118 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 29 transitions. [2020-11-22 12:58:02,119 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-11-22 12:58:02,119 INFO L414 BasicCegarLoop]: Found error trace [2020-11-22 12:58:02,119 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-22 12:58:02,345 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable64 [2020-11-22 12:58:02,345 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-22 12:58:02,346 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-22 12:58:02,346 INFO L82 PathProgramCache]: Analyzing trace with hash 1062655729, now seen corresponding path program 1 times [2020-11-22 12:58:02,346 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-22 12:58:02,346 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1773158868] [2020-11-22 12:58:02,346 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-22 12:58:02,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 12:58:02,439 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-11-22 12:58:02,439 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1773158868] [2020-11-22 12:58:02,439 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [344898203] [2020-11-22 12:58:02,439 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_42c39fdd-578f-44ab-b9a2-0f3482a75e7e/bin/utaipan/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-22 12:58:02,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 12:58:02,496 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 6 conjunts are in the unsatisfiable core [2020-11-22 12:58:02,498 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-22 12:58:02,583 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-11-22 12:58:02,583 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-22 12:58:02,604 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-11-22 12:58:02,604 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1920514694] [2020-11-22 12:58:02,606 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2020-11-22 12:58:02,607 INFO L166 IcfgInterpreter]: Building call graph [2020-11-22 12:58:02,607 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-11-22 12:58:02,607 INFO L176 IcfgInterpreter]: Starting interpretation [2020-11-22 12:58:02,607 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-11-22 12:58:02,706 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-11-22 12:58:02,944 WARN L193 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 49 [2020-11-22 12:58:03,745 INFO L180 IcfgInterpreter]: Interpretation finished [2020-11-22 12:58:03,917 WARN L193 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 63 DAG size of output: 46 [2020-11-22 12:58:04,203 WARN L193 SmtUtils]: Spent 153.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 43 [2020-11-22 12:58:04,693 WARN L193 SmtUtils]: Spent 454.00 ms on a formula simplification. DAG size of input: 78 DAG size of output: 62 [2020-11-22 12:58:04,863 WARN L193 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 47 [2020-11-22 12:58:05,047 WARN L193 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 64 DAG size of output: 49 [2020-11-22 12:58:05,048 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-11-22 12:58:05,048 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-22 12:58:05,048 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 9 [2020-11-22 12:58:05,048 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [925859481] [2020-11-22 12:58:05,048 INFO L461 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-11-22 12:58:05,049 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-22 12:58:05,049 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-11-22 12:58:05,049 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2020-11-22 12:58:05,049 INFO L87 Difference]: Start difference. First operand 21 states and 29 transitions. Second operand 10 states. [2020-11-22 12:58:05,181 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-22 12:58:05,181 INFO L93 Difference]: Finished difference Result 42 states and 51 transitions. [2020-11-22 12:58:05,182 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-11-22 12:58:05,182 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 11 [2020-11-22 12:58:05,182 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-22 12:58:05,184 INFO L225 Difference]: With dead ends: 42 [2020-11-22 12:58:05,184 INFO L226 Difference]: Without dead ends: 31 [2020-11-22 12:58:05,185 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=70, Invalid=272, Unknown=0, NotChecked=0, Total=342 [2020-11-22 12:58:05,185 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-11-22 12:58:05,192 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 21. [2020-11-22 12:58:05,193 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-11-22 12:58:05,204 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 28 transitions. [2020-11-22 12:58:05,204 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 28 transitions. Word has length 11 [2020-11-22 12:58:05,204 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-22 12:58:05,204 INFO L481 AbstractCegarLoop]: Abstraction has 21 states and 28 transitions. [2020-11-22 12:58:05,204 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-11-22 12:58:05,205 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 28 transitions. [2020-11-22 12:58:05,205 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-11-22 12:58:05,206 INFO L414 BasicCegarLoop]: Found error trace [2020-11-22 12:58:05,206 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2020-11-22 12:58:05,423 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable95,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-22 12:58:05,423 INFO L429 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-22 12:58:05,424 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-22 12:58:05,424 INFO L82 PathProgramCache]: Analyzing trace with hash -953398469, now seen corresponding path program 2 times [2020-11-22 12:58:05,424 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-22 12:58:05,424 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1625601781] [2020-11-22 12:58:05,424 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-22 12:58:05,471 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-22 12:58:05,485 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-22 12:58:05,519 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-22 12:58:05,523 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-22 12:58:05,549 INFO L173 FreeRefinementEngine]: Strategy SIFA_TAIPAN found a feasible trace [2020-11-22 12:58:05,549 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-11-22 12:58:05,550 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable142 [2020-11-22 12:58:05,602 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 22.11 12:58:05 BoogieIcfgContainer [2020-11-22 12:58:05,602 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-11-22 12:58:05,603 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-11-22 12:58:05,603 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-11-22 12:58:05,603 INFO L275 PluginConnector]: Witness Printer initialized [2020-11-22 12:58:05,604 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.11 12:57:46" (3/4) ... [2020-11-22 12:58:05,606 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2020-11-22 12:58:05,672 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/run_dir_42c39fdd-578f-44ab-b9a2-0f3482a75e7e/bin/utaipan/witness.graphml [2020-11-22 12:58:05,674 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-11-22 12:58:05,676 INFO L168 Benchmark]: Toolchain (without parser) took 20404.85 ms. Allocated memory was 94.4 MB in the beginning and 167.8 MB in the end (delta: 73.4 MB). Free memory was 64.6 MB in the beginning and 133.1 MB in the end (delta: -68.5 MB). Peak memory consumption was 4.7 MB. Max. memory is 16.1 GB. [2020-11-22 12:58:05,677 INFO L168 Benchmark]: CDTParser took 0.24 ms. Allocated memory is still 94.4 MB. Free memory was 51.1 MB in the beginning and 51.1 MB in the end (delta: 2.0 kB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-11-22 12:58:05,677 INFO L168 Benchmark]: CACSL2BoogieTranslator took 372.69 ms. Allocated memory is still 94.4 MB. Free memory was 64.4 MB in the beginning and 70.1 MB in the end (delta: -5.7 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. [2020-11-22 12:58:05,678 INFO L168 Benchmark]: Boogie Procedure Inliner took 41.29 ms. Allocated memory is still 94.4 MB. Free memory was 70.1 MB in the beginning and 68.3 MB in the end (delta: 1.7 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-11-22 12:58:05,678 INFO L168 Benchmark]: Boogie Preprocessor took 51.01 ms. Allocated memory is still 94.4 MB. Free memory was 68.3 MB in the beginning and 67.2 MB in the end (delta: 1.2 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-11-22 12:58:05,678 INFO L168 Benchmark]: RCFGBuilder took 759.17 ms. Allocated memory was 94.4 MB in the beginning and 115.3 MB in the end (delta: 21.0 MB). Free memory was 67.2 MB in the beginning and 92.3 MB in the end (delta: -25.1 MB). Peak memory consumption was 27.1 MB. Max. memory is 16.1 GB. [2020-11-22 12:58:05,679 INFO L168 Benchmark]: TraceAbstraction took 19100.98 ms. Allocated memory was 115.3 MB in the beginning and 167.8 MB in the end (delta: 52.4 MB). Free memory was 91.7 MB in the beginning and 136.2 MB in the end (delta: -44.5 MB). Peak memory consumption was 8.1 MB. Max. memory is 16.1 GB. [2020-11-22 12:58:05,679 INFO L168 Benchmark]: Witness Printer took 72.57 ms. Allocated memory is still 167.8 MB. Free memory was 136.2 MB in the beginning and 133.1 MB in the end (delta: 3.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-11-22 12:58:05,681 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.24 ms. Allocated memory is still 94.4 MB. Free memory was 51.1 MB in the beginning and 51.1 MB in the end (delta: 2.0 kB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 372.69 ms. Allocated memory is still 94.4 MB. Free memory was 64.4 MB in the beginning and 70.1 MB in the end (delta: -5.7 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 41.29 ms. Allocated memory is still 94.4 MB. Free memory was 70.1 MB in the beginning and 68.3 MB in the end (delta: 1.7 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Boogie Preprocessor took 51.01 ms. Allocated memory is still 94.4 MB. Free memory was 68.3 MB in the beginning and 67.2 MB in the end (delta: 1.2 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * RCFGBuilder took 759.17 ms. Allocated memory was 94.4 MB in the beginning and 115.3 MB in the end (delta: 21.0 MB). Free memory was 67.2 MB in the beginning and 92.3 MB in the end (delta: -25.1 MB). Peak memory consumption was 27.1 MB. Max. memory is 16.1 GB. * TraceAbstraction took 19100.98 ms. Allocated memory was 115.3 MB in the beginning and 167.8 MB in the end (delta: 52.4 MB). Free memory was 91.7 MB in the beginning and 136.2 MB in the end (delta: -44.5 MB). Peak memory consumption was 8.1 MB. Max. memory is 16.1 GB. * Witness Printer took 72.57 ms. Allocated memory is still 167.8 MB. Free memory was 136.2 MB in the beginning and 133.1 MB in the end (delta: 3.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 3]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L16] int MAX = __VERIFIER_nondet_uint(); [L17] COND FALSE !(!(MAX > 0)) [L18] char str1[MAX], str2[MAX]; [L19] int cont, i, j; [L20] cont = 0 [L22] i=0 [L22] COND TRUE i= 0 [L30] EXPR str1[0] [L30] str2[j] = str1[0] [L31] j++ [L29] i-- [L29] COND TRUE i >= 0 [L30] EXPR str1[0] [L30] str2[j] = str1[0] [L31] j++ [L29] i-- [L29] COND FALSE !(i >= 0) [L34] j = MAX-1 [L35] i=0 [L35] COND TRUE i