./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/termination-crafted/LexIndexValue-Pointer-2.c --full-output --architecture 64bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version 53f42b1a Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03ba479e-94ca-4db9-8bd9-9a5c222b13d3/bin/utaipan-TEXQjIfE4P/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03ba479e-94ca-4db9-8bd9-9a5c222b13d3/bin/utaipan-TEXQjIfE4P/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03ba479e-94ca-4db9-8bd9-9a5c222b13d3/bin/utaipan-TEXQjIfE4P/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03ba479e-94ca-4db9-8bd9-9a5c222b13d3/bin/utaipan-TEXQjIfE4P/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/termination-crafted/LexIndexValue-Pointer-2.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03ba479e-94ca-4db9-8bd9-9a5c222b13d3/bin/utaipan-TEXQjIfE4P/config/svcomp-DerefFreeMemtrack-64bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03ba479e-94ca-4db9-8bd9-9a5c222b13d3/bin/utaipan-TEXQjIfE4P --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 64bit --witnessprinter.graph.data.programhash 1bedc761cea545b8144ad4138a379d7139cc98703c76e9b536a2e7389d5b6a10 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-53f42b1 [2021-11-21 00:29:24,760 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-21 00:29:24,763 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-21 00:29:24,817 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-21 00:29:24,818 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-21 00:29:24,822 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-21 00:29:24,824 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-21 00:29:24,828 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-21 00:29:24,831 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-21 00:29:24,836 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-21 00:29:24,837 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-21 00:29:24,839 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-21 00:29:24,840 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-21 00:29:24,842 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-21 00:29:24,844 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-21 00:29:24,849 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-21 00:29:24,851 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-21 00:29:24,852 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-21 00:29:24,855 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-21 00:29:24,862 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-21 00:29:24,864 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-21 00:29:24,866 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-21 00:29:24,869 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-21 00:29:24,871 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-21 00:29:24,880 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-21 00:29:24,881 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-21 00:29:24,881 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-21 00:29:24,883 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-21 00:29:24,884 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-21 00:29:24,885 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-21 00:29:24,886 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-21 00:29:24,887 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-21 00:29:24,889 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-21 00:29:24,891 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-21 00:29:24,892 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-21 00:29:24,893 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-21 00:29:24,893 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-21 00:29:24,894 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-21 00:29:24,894 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-21 00:29:24,895 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-21 00:29:24,896 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-21 00:29:24,897 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03ba479e-94ca-4db9-8bd9-9a5c222b13d3/bin/utaipan-TEXQjIfE4P/config/svcomp-DerefFreeMemtrack-64bit-Taipan_Default.epf [2021-11-21 00:29:24,948 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-21 00:29:24,948 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-21 00:29:24,949 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-21 00:29:24,949 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-21 00:29:24,951 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-21 00:29:24,951 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-21 00:29:24,951 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-21 00:29:24,951 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-21 00:29:24,952 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-21 00:29:24,952 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-21 00:29:24,953 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-21 00:29:24,953 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-21 00:29:24,953 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-21 00:29:24,954 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-21 00:29:24,954 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-21 00:29:24,954 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-21 00:29:24,954 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-21 00:29:24,955 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-21 00:29:24,955 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-11-21 00:29:24,956 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-11-21 00:29:24,956 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-21 00:29:24,956 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-11-21 00:29:24,957 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-21 00:29:24,958 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-21 00:29:24,958 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-11-21 00:29:24,959 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-11-21 00:29:24,959 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2021-11-21 00:29:24,959 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-21 00:29:24,959 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-21 00:29:24,960 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-21 00:29:24,960 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-21 00:29:24,960 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-21 00:29:24,960 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 00:29:24,961 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-21 00:29:24,961 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-21 00:29:24,961 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-21 00:29:24,961 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-21 00:29:24,962 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-21 00:29:24,962 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-21 00:29:24,962 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_worker_vcloud-master_on_vcloud-master/run_dir_03ba479e-94ca-4db9-8bd9-9a5c222b13d3/bin/utaipan-TEXQjIfE4P/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03ba479e-94ca-4db9-8bd9-9a5c222b13d3/bin/utaipan-TEXQjIfE4P Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 64bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 1bedc761cea545b8144ad4138a379d7139cc98703c76e9b536a2e7389d5b6a10 [2021-11-21 00:29:25,302 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-21 00:29:25,343 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-21 00:29:25,346 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-21 00:29:25,347 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-21 00:29:25,348 INFO L275 PluginConnector]: CDTParser initialized [2021-11-21 00:29:25,350 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03ba479e-94ca-4db9-8bd9-9a5c222b13d3/bin/utaipan-TEXQjIfE4P/../../sv-benchmarks/c/termination-crafted/LexIndexValue-Pointer-2.c [2021-11-21 00:29:25,427 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03ba479e-94ca-4db9-8bd9-9a5c222b13d3/bin/utaipan-TEXQjIfE4P/data/40bf88d74/fcbcdb4ba9004209855dbbf9f6e509ac/FLAG6d2a6d706 [2021-11-21 00:29:25,896 INFO L306 CDTParser]: Found 1 translation units. [2021-11-21 00:29:25,897 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03ba479e-94ca-4db9-8bd9-9a5c222b13d3/sv-benchmarks/c/termination-crafted/LexIndexValue-Pointer-2.c [2021-11-21 00:29:25,908 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03ba479e-94ca-4db9-8bd9-9a5c222b13d3/bin/utaipan-TEXQjIfE4P/data/40bf88d74/fcbcdb4ba9004209855dbbf9f6e509ac/FLAG6d2a6d706 [2021-11-21 00:29:26,308 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03ba479e-94ca-4db9-8bd9-9a5c222b13d3/bin/utaipan-TEXQjIfE4P/data/40bf88d74/fcbcdb4ba9004209855dbbf9f6e509ac [2021-11-21 00:29:26,311 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-21 00:29:26,312 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-21 00:29:26,315 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-21 00:29:26,316 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-21 00:29:26,320 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-21 00:29:26,321 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 12:29:26" (1/1) ... [2021-11-21 00:29:26,322 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@189b41ae and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:29:26, skipping insertion in model container [2021-11-21 00:29:26,322 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 12:29:26" (1/1) ... [2021-11-21 00:29:26,329 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-21 00:29:26,342 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-21 00:29:26,513 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 00:29:26,520 INFO L203 MainTranslator]: Completed pre-run [2021-11-21 00:29:26,534 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 00:29:26,547 INFO L208 MainTranslator]: Completed translation [2021-11-21 00:29:26,547 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:29:26 WrapperNode [2021-11-21 00:29:26,547 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-21 00:29:26,548 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-21 00:29:26,548 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-21 00:29:26,548 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-21 00:29:26,554 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:29:26" (1/1) ... [2021-11-21 00:29:26,560 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:29:26" (1/1) ... [2021-11-21 00:29:26,586 INFO L137 Inliner]: procedures = 10, calls = 8, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 51 [2021-11-21 00:29:26,586 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-21 00:29:26,587 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-21 00:29:26,587 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-21 00:29:26,588 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-21 00:29:26,597 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:29:26" (1/1) ... [2021-11-21 00:29:26,597 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:29:26" (1/1) ... [2021-11-21 00:29:26,611 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:29:26" (1/1) ... [2021-11-21 00:29:26,612 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:29:26" (1/1) ... [2021-11-21 00:29:26,616 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:29:26" (1/1) ... [2021-11-21 00:29:26,620 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:29:26" (1/1) ... [2021-11-21 00:29:26,621 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:29:26" (1/1) ... [2021-11-21 00:29:26,623 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-21 00:29:26,623 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-21 00:29:26,624 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-21 00:29:26,624 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-21 00:29:26,628 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:29:26" (1/1) ... [2021-11-21 00:29:26,635 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 00:29:26,649 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03ba479e-94ca-4db9-8bd9-9a5c222b13d3/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:29:26,669 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03ba479e-94ca-4db9-8bd9-9a5c222b13d3/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-21 00:29:26,692 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03ba479e-94ca-4db9-8bd9-9a5c222b13d3/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-21 00:29:26,717 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-21 00:29:26,717 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-11-21 00:29:26,717 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-21 00:29:26,717 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-21 00:29:26,718 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-21 00:29:26,718 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-21 00:29:26,784 INFO L236 CfgBuilder]: Building ICFG [2021-11-21 00:29:26,785 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-21 00:29:26,994 INFO L277 CfgBuilder]: Performing block encoding [2021-11-21 00:29:27,020 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-21 00:29:27,021 INFO L301 CfgBuilder]: Removed 2 assume(true) statements. [2021-11-21 00:29:27,023 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 12:29:27 BoogieIcfgContainer [2021-11-21 00:29:27,023 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-21 00:29:27,025 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-21 00:29:27,025 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-21 00:29:27,039 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-21 00:29:27,040 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.11 12:29:26" (1/3) ... [2021-11-21 00:29:27,040 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4f36037d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 12:29:27, skipping insertion in model container [2021-11-21 00:29:27,041 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:29:26" (2/3) ... [2021-11-21 00:29:27,041 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4f36037d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 12:29:27, skipping insertion in model container [2021-11-21 00:29:27,041 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 12:29:27" (3/3) ... [2021-11-21 00:29:27,042 INFO L111 eAbstractionObserver]: Analyzing ICFG LexIndexValue-Pointer-2.c [2021-11-21 00:29:27,047 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-21 00:29:27,047 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 12 error locations. [2021-11-21 00:29:27,091 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-21 00:29:27,114 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=false, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-21 00:29:27,114 INFO L340 AbstractCegarLoop]: Starting to check reachability of 12 error locations. [2021-11-21 00:29:27,130 INFO L276 IsEmpty]: Start isEmpty. Operand has 27 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 26 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:29:27,136 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2021-11-21 00:29:27,136 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:29:27,137 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1] [2021-11-21 00:29:27,137 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 8 more)] === [2021-11-21 00:29:27,142 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:29:27,143 INFO L85 PathProgramCache]: Analyzing trace with hash 99305, now seen corresponding path program 1 times [2021-11-21 00:29:27,152 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:29:27,152 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [720019780] [2021-11-21 00:29:27,152 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:29:27,153 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:29:27,286 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:29:27,360 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:29:27,361 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:29:27,361 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [720019780] [2021-11-21 00:29:27,362 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [720019780] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:29:27,363 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:29:27,363 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-11-21 00:29:27,365 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1863291006] [2021-11-21 00:29:27,366 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:29:27,370 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:29:27,370 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:29:27,397 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:29:27,398 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:29:27,400 INFO L87 Difference]: Start difference. First operand has 27 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 26 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:29:27,481 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:29:27,481 INFO L93 Difference]: Finished difference Result 39 states and 45 transitions. [2021-11-21 00:29:27,483 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:29:27,485 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 3 [2021-11-21 00:29:27,485 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:29:27,494 INFO L225 Difference]: With dead ends: 39 [2021-11-21 00:29:27,495 INFO L226 Difference]: Without dead ends: 38 [2021-11-21 00:29:27,509 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:29:27,516 INFO L933 BasicCegarLoop]: 28 mSDtfsCounter, 17 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 29 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 37 SdHoareTripleChecker+Invalid, 35 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 29 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:29:27,518 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [17 Valid, 37 Invalid, 35 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 29 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:29:27,537 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2021-11-21 00:29:27,558 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 30. [2021-11-21 00:29:27,560 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 20 states have (on average 1.9) internal successors, (38), 29 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:29:27,562 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 38 transitions. [2021-11-21 00:29:27,563 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 38 transitions. Word has length 3 [2021-11-21 00:29:27,563 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:29:27,563 INFO L470 AbstractCegarLoop]: Abstraction has 30 states and 38 transitions. [2021-11-21 00:29:27,564 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:29:27,564 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 38 transitions. [2021-11-21 00:29:27,564 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2021-11-21 00:29:27,564 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:29:27,564 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1] [2021-11-21 00:29:27,566 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-21 00:29:27,566 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 8 more)] === [2021-11-21 00:29:27,570 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:29:27,570 INFO L85 PathProgramCache]: Analyzing trace with hash 99306, now seen corresponding path program 1 times [2021-11-21 00:29:27,570 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:29:27,571 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [490572788] [2021-11-21 00:29:27,571 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:29:27,571 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:29:27,595 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:29:27,630 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:29:27,630 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:29:27,631 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [490572788] [2021-11-21 00:29:27,631 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [490572788] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:29:27,631 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:29:27,631 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-11-21 00:29:27,632 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1146973954] [2021-11-21 00:29:27,632 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:29:27,633 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:29:27,633 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:29:27,633 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:29:27,634 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:29:27,634 INFO L87 Difference]: Start difference. First operand 30 states and 38 transitions. Second operand has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:29:27,665 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:29:27,665 INFO L93 Difference]: Finished difference Result 32 states and 40 transitions. [2021-11-21 00:29:27,665 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:29:27,666 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 3 [2021-11-21 00:29:27,666 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:29:27,667 INFO L225 Difference]: With dead ends: 32 [2021-11-21 00:29:27,667 INFO L226 Difference]: Without dead ends: 32 [2021-11-21 00:29:27,667 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:29:27,669 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 0 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 21 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 32 SdHoareTripleChecker+Invalid, 22 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 21 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 00:29:27,670 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 32 Invalid, 22 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 21 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 00:29:27,671 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-11-21 00:29:27,674 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2021-11-21 00:29:27,675 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 22 states have (on average 1.8181818181818181) internal successors, (40), 31 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:29:27,676 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 40 transitions. [2021-11-21 00:29:27,676 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 40 transitions. Word has length 3 [2021-11-21 00:29:27,676 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:29:27,676 INFO L470 AbstractCegarLoop]: Abstraction has 32 states and 40 transitions. [2021-11-21 00:29:27,677 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:29:27,677 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 40 transitions. [2021-11-21 00:29:27,677 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2021-11-21 00:29:27,677 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:29:27,678 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1] [2021-11-21 00:29:27,678 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-21 00:29:27,678 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 8 more)] === [2021-11-21 00:29:27,679 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:29:27,679 INFO L85 PathProgramCache]: Analyzing trace with hash 95488166, now seen corresponding path program 1 times [2021-11-21 00:29:27,679 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:29:27,679 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1517249517] [2021-11-21 00:29:27,679 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:29:27,680 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:29:27,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:29:27,771 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:29:27,772 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:29:27,772 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1517249517] [2021-11-21 00:29:27,772 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1517249517] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:29:27,773 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [114828920] [2021-11-21 00:29:27,773 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:29:27,773 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:29:27,773 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03ba479e-94ca-4db9-8bd9-9a5c222b13d3/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:29:27,789 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03ba479e-94ca-4db9-8bd9-9a5c222b13d3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:29:27,797 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03ba479e-94ca-4db9-8bd9-9a5c222b13d3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-21 00:29:27,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:29:27,838 INFO L263 TraceCheckSpWp]: Trace formula consists of 38 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-21 00:29:27,842 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:29:27,931 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-21 00:29:28,044 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:29:28,045 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:29:28,136 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:29:28,136 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [114828920] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:29:28,139 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [559137646] [2021-11-21 00:29:28,168 INFO L159 IcfgInterpreter]: Started Sifa with 4 locations of interest [2021-11-21 00:29:28,168 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:29:28,176 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:29:28,181 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:29:28,182 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:29:28,246 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-21 00:29:28,396 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-21 00:29:28,628 INFO L354 Elim1Store]: treesize reduction 21, result has 38.2 percent of original size [2021-11-21 00:29:28,628 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 142 treesize of output 143 [2021-11-21 00:29:29,238 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 00:29:29,362 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 00:29:29,438 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:29:29,663 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:29:29,663 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:29:29,663 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 2, 2] total 6 [2021-11-21 00:29:29,664 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1065924804] [2021-11-21 00:29:29,664 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:29:29,664 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-21 00:29:29,664 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:29:29,665 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-21 00:29:29,665 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2021-11-21 00:29:29,666 INFO L87 Difference]: Start difference. First operand 32 states and 40 transitions. Second operand has 8 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 7 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:29:29,794 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:29:29,795 INFO L93 Difference]: Finished difference Result 36 states and 44 transitions. [2021-11-21 00:29:29,795 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-21 00:29:29,795 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 7 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 5 [2021-11-21 00:29:29,795 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:29:29,796 INFO L225 Difference]: With dead ends: 36 [2021-11-21 00:29:29,796 INFO L226 Difference]: Without dead ends: 36 [2021-11-21 00:29:29,797 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=35, Invalid=97, Unknown=0, NotChecked=0, Total=132 [2021-11-21 00:29:29,798 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 4 mSDsluCounter, 60 mSDsCounter, 0 mSdLazyCounter, 76 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 79 SdHoareTripleChecker+Invalid, 89 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 76 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:29:29,799 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4 Valid, 79 Invalid, 89 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 76 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:29:29,799 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-11-21 00:29:29,802 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2021-11-21 00:29:29,803 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 27 states have (on average 1.6296296296296295) internal successors, (44), 35 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:29:29,804 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 44 transitions. [2021-11-21 00:29:29,804 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 44 transitions. Word has length 5 [2021-11-21 00:29:29,804 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:29:29,804 INFO L470 AbstractCegarLoop]: Abstraction has 36 states and 44 transitions. [2021-11-21 00:29:29,804 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 7 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:29:29,805 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 44 transitions. [2021-11-21 00:29:29,805 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-11-21 00:29:29,805 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:29:29,805 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1] [2021-11-21 00:29:29,843 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03ba479e-94ca-4db9-8bd9-9a5c222b13d3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-21 00:29:30,028 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03ba479e-94ca-4db9-8bd9-9a5c222b13d3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:29:30,029 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 8 more)] === [2021-11-21 00:29:30,029 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:29:30,029 INFO L85 PathProgramCache]: Analyzing trace with hash -1433174170, now seen corresponding path program 1 times [2021-11-21 00:29:30,029 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:29:30,029 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [403325400] [2021-11-21 00:29:30,029 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:29:30,030 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:29:30,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:29:30,107 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 6 proven. 4 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-21 00:29:30,107 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:29:30,108 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [403325400] [2021-11-21 00:29:30,108 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [403325400] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:29:30,108 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1870720938] [2021-11-21 00:29:30,108 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:29:30,108 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:29:30,109 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03ba479e-94ca-4db9-8bd9-9a5c222b13d3/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:29:30,129 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03ba479e-94ca-4db9-8bd9-9a5c222b13d3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:29:30,147 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03ba479e-94ca-4db9-8bd9-9a5c222b13d3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-21 00:29:30,175 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:29:30,177 INFO L263 TraceCheckSpWp]: Trace formula consists of 72 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-21 00:29:30,178 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:29:30,185 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-21 00:29:30,219 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-21 00:29:30,219 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 00:29:30,219 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1870720938] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:29:30,219 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 00:29:30,219 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [4] total 4 [2021-11-21 00:29:30,220 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1903361037] [2021-11-21 00:29:30,220 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:29:30,222 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 00:29:30,222 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:29:30,223 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 00:29:30,223 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-11-21 00:29:30,223 INFO L87 Difference]: Start difference. First operand 36 states and 44 transitions. Second operand has 4 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:29:30,259 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:29:30,259 INFO L93 Difference]: Finished difference Result 33 states and 41 transitions. [2021-11-21 00:29:30,259 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:29:30,259 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2021-11-21 00:29:30,260 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:29:30,261 INFO L225 Difference]: With dead ends: 33 [2021-11-21 00:29:30,261 INFO L226 Difference]: Without dead ends: 33 [2021-11-21 00:29:30,262 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-11-21 00:29:30,263 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 32 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 18 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 24 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 18 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 00:29:30,264 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [32 Valid, 9 Invalid, 24 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 18 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 00:29:30,265 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2021-11-21 00:29:30,267 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 27. [2021-11-21 00:29:30,267 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 21 states have (on average 1.4285714285714286) internal successors, (30), 26 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:29:30,268 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 30 transitions. [2021-11-21 00:29:30,268 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 30 transitions. Word has length 13 [2021-11-21 00:29:30,268 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:29:30,268 INFO L470 AbstractCegarLoop]: Abstraction has 27 states and 30 transitions. [2021-11-21 00:29:30,269 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:29:30,269 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 30 transitions. [2021-11-21 00:29:30,269 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-11-21 00:29:30,269 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:29:30,269 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1] [2021-11-21 00:29:30,300 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03ba479e-94ca-4db9-8bd9-9a5c222b13d3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-21 00:29:30,496 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03ba479e-94ca-4db9-8bd9-9a5c222b13d3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:29:30,497 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 8 more)] === [2021-11-21 00:29:30,497 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:29:30,497 INFO L85 PathProgramCache]: Analyzing trace with hash -1433174169, now seen corresponding path program 1 times [2021-11-21 00:29:30,497 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:29:30,498 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1965569244] [2021-11-21 00:29:30,498 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:29:30,498 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:29:30,519 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:29:30,560 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:29:30,560 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:29:30,560 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1965569244] [2021-11-21 00:29:30,560 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1965569244] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:29:30,560 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [193893851] [2021-11-21 00:29:30,560 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:29:30,561 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:29:30,561 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03ba479e-94ca-4db9-8bd9-9a5c222b13d3/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:29:30,562 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03ba479e-94ca-4db9-8bd9-9a5c222b13d3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:29:30,590 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03ba479e-94ca-4db9-8bd9-9a5c222b13d3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-21 00:29:30,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:29:30,620 INFO L263 TraceCheckSpWp]: Trace formula consists of 72 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-21 00:29:30,621 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:29:30,660 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:29:30,660 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:29:30,728 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:29:30,729 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [193893851] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:29:30,729 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1482760798] [2021-11-21 00:29:30,741 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 00:29:30,741 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:29:30,741 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:29:30,741 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:29:30,741 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:29:30,772 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-21 00:29:30,870 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-21 00:29:31,049 INFO L354 Elim1Store]: treesize reduction 21, result has 38.2 percent of original size [2021-11-21 00:29:31,050 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 142 treesize of output 143 [2021-11-21 00:29:31,459 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 00:29:31,595 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 00:29:31,976 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:29:32,297 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:29:32,297 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:29:32,297 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 12 [2021-11-21 00:29:32,297 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [543861329] [2021-11-21 00:29:32,297 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:29:32,298 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-21 00:29:32,298 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:29:32,298 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-21 00:29:32,298 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=215, Unknown=0, NotChecked=0, Total=306 [2021-11-21 00:29:32,299 INFO L87 Difference]: Start difference. First operand 27 states and 30 transitions. Second operand has 13 states, 13 states have (on average 2.0) internal successors, (26), 12 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:29:32,360 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:29:32,360 INFO L93 Difference]: Finished difference Result 39 states and 42 transitions. [2021-11-21 00:29:32,361 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-21 00:29:32,361 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.0) internal successors, (26), 12 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2021-11-21 00:29:32,361 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:29:32,362 INFO L225 Difference]: With dead ends: 39 [2021-11-21 00:29:32,362 INFO L226 Difference]: Without dead ends: 39 [2021-11-21 00:29:32,362 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 91 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=91, Invalid=215, Unknown=0, NotChecked=0, Total=306 [2021-11-21 00:29:32,363 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 15 mSDsluCounter, 38 mSDsCounter, 0 mSdLazyCounter, 36 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 45 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 36 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:29:32,364 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 48 Invalid, 45 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 36 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:29:32,364 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2021-11-21 00:29:32,367 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2021-11-21 00:29:32,368 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 33 states have (on average 1.2727272727272727) internal successors, (42), 38 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:29:32,369 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 42 transitions. [2021-11-21 00:29:32,369 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 42 transitions. Word has length 13 [2021-11-21 00:29:32,369 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:29:32,369 INFO L470 AbstractCegarLoop]: Abstraction has 39 states and 42 transitions. [2021-11-21 00:29:32,370 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 2.0) internal successors, (26), 12 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:29:32,370 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 42 transitions. [2021-11-21 00:29:32,370 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-11-21 00:29:32,371 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:29:32,371 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1] [2021-11-21 00:29:32,396 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03ba479e-94ca-4db9-8bd9-9a5c222b13d3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2021-11-21 00:29:32,584 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03ba479e-94ca-4db9-8bd9-9a5c222b13d3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:29:32,584 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 8 more)] === [2021-11-21 00:29:32,585 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:29:32,585 INFO L85 PathProgramCache]: Analyzing trace with hash 691325135, now seen corresponding path program 2 times [2021-11-21 00:29:32,585 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:29:32,585 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1837524393] [2021-11-21 00:29:32,585 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:29:32,585 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:29:32,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:29:32,738 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:29:32,738 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:29:32,738 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1837524393] [2021-11-21 00:29:32,738 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1837524393] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:29:32,738 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1178757310] [2021-11-21 00:29:32,739 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 00:29:32,739 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:29:32,739 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03ba479e-94ca-4db9-8bd9-9a5c222b13d3/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:29:32,739 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03ba479e-94ca-4db9-8bd9-9a5c222b13d3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:29:32,740 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03ba479e-94ca-4db9-8bd9-9a5c222b13d3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-21 00:29:32,768 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 1 check-sat command(s) [2021-11-21 00:29:32,768 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:29:32,769 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-21 00:29:32,771 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:29:32,775 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-21 00:29:32,909 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-11-21 00:29:32,910 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 00:29:32,910 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1178757310] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:29:32,910 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 00:29:32,910 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [12] total 14 [2021-11-21 00:29:32,911 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1471880579] [2021-11-21 00:29:32,911 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:29:32,911 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 00:29:32,911 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:29:32,912 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 00:29:32,912 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=128, Unknown=0, NotChecked=0, Total=210 [2021-11-21 00:29:32,912 INFO L87 Difference]: Start difference. First operand 39 states and 42 transitions. Second operand has 4 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:29:32,970 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:29:32,970 INFO L93 Difference]: Finished difference Result 51 states and 56 transitions. [2021-11-21 00:29:32,970 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 00:29:32,971 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 25 [2021-11-21 00:29:32,971 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:29:32,972 INFO L225 Difference]: With dead ends: 51 [2021-11-21 00:29:32,972 INFO L226 Difference]: Without dead ends: 51 [2021-11-21 00:29:32,972 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=86, Invalid=154, Unknown=0, NotChecked=0, Total=240 [2021-11-21 00:29:32,973 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 46 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 27 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 46 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 34 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 27 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 00:29:32,974 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [46 Valid, 13 Invalid, 34 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 27 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 00:29:32,974 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2021-11-21 00:29:32,978 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 45. [2021-11-21 00:29:32,978 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 40 states have (on average 1.275) internal successors, (51), 44 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:29:32,979 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 51 transitions. [2021-11-21 00:29:32,979 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 51 transitions. Word has length 25 [2021-11-21 00:29:32,980 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:29:32,980 INFO L470 AbstractCegarLoop]: Abstraction has 45 states and 51 transitions. [2021-11-21 00:29:32,980 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:29:32,980 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 51 transitions. [2021-11-21 00:29:32,981 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-11-21 00:29:32,981 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:29:32,981 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:29:33,019 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03ba479e-94ca-4db9-8bd9-9a5c222b13d3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-21 00:29:33,204 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03ba479e-94ca-4db9-8bd9-9a5c222b13d3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:29:33,204 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr9ASSERT_VIOLATIONMEMORY_FREE === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 8 more)] === [2021-11-21 00:29:33,205 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:29:33,205 INFO L85 PathProgramCache]: Analyzing trace with hash -1356288783, now seen corresponding path program 1 times [2021-11-21 00:29:33,205 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:29:33,205 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1856627669] [2021-11-21 00:29:33,205 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:29:33,206 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:29:33,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:29:33,263 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-11-21 00:29:33,263 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:29:33,263 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1856627669] [2021-11-21 00:29:33,263 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1856627669] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:29:33,264 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:29:33,264 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-11-21 00:29:33,264 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [447254678] [2021-11-21 00:29:33,264 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:29:33,265 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:29:33,265 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:29:33,265 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:29:33,265 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:29:33,266 INFO L87 Difference]: Start difference. First operand 45 states and 51 transitions. Second operand has 3 states, 2 states have (on average 4.5) internal successors, (9), 2 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:29:33,277 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:29:33,277 INFO L93 Difference]: Finished difference Result 44 states and 50 transitions. [2021-11-21 00:29:33,278 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:29:33,278 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 4.5) internal successors, (9), 2 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 27 [2021-11-21 00:29:33,278 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:29:33,279 INFO L225 Difference]: With dead ends: 44 [2021-11-21 00:29:33,279 INFO L226 Difference]: Without dead ends: 44 [2021-11-21 00:29:33,280 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:29:33,280 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 13 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 9 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 12 SdHoareTripleChecker+Invalid, 9 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 9 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 00:29:33,281 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [13 Valid, 12 Invalid, 9 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 9 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 00:29:33,282 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2021-11-21 00:29:33,284 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2021-11-21 00:29:33,285 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 40 states have (on average 1.25) internal successors, (50), 43 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:29:33,285 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 50 transitions. [2021-11-21 00:29:33,286 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 50 transitions. Word has length 27 [2021-11-21 00:29:33,286 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:29:33,286 INFO L470 AbstractCegarLoop]: Abstraction has 44 states and 50 transitions. [2021-11-21 00:29:33,286 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 4.5) internal successors, (9), 2 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:29:33,287 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 50 transitions. [2021-11-21 00:29:33,287 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-11-21 00:29:33,288 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:29:33,288 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:29:33,288 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-21 00:29:33,288 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr11ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 8 more)] === [2021-11-21 00:29:33,289 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:29:33,289 INFO L85 PathProgramCache]: Analyzing trace with hash -2018426796, now seen corresponding path program 1 times [2021-11-21 00:29:33,289 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:29:33,289 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [492926259] [2021-11-21 00:29:33,289 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:29:33,290 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:29:33,308 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:29:33,356 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-11-21 00:29:33,356 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:29:33,357 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [492926259] [2021-11-21 00:29:33,357 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [492926259] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:29:33,357 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:29:33,357 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-21 00:29:33,357 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [731862559] [2021-11-21 00:29:33,358 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:29:33,358 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 00:29:33,358 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:29:33,358 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 00:29:33,359 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-21 00:29:33,359 INFO L87 Difference]: Start difference. First operand 44 states and 50 transitions. Second operand has 4 states, 4 states have (on average 2.75) internal successors, (11), 4 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:29:33,395 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:29:33,395 INFO L93 Difference]: Finished difference Result 49 states and 53 transitions. [2021-11-21 00:29:33,395 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-21 00:29:33,396 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 4 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 29 [2021-11-21 00:29:33,396 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:29:33,398 INFO L225 Difference]: With dead ends: 49 [2021-11-21 00:29:33,398 INFO L226 Difference]: Without dead ends: 49 [2021-11-21 00:29:33,399 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-21 00:29:33,399 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 15 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 37 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 20 SdHoareTripleChecker+Invalid, 40 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 37 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 00:29:33,400 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 20 Invalid, 40 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 37 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 00:29:33,400 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2021-11-21 00:29:33,413 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 44. [2021-11-21 00:29:33,413 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 40 states have (on average 1.225) internal successors, (49), 43 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:29:33,416 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 49 transitions. [2021-11-21 00:29:33,417 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 49 transitions. Word has length 29 [2021-11-21 00:29:33,417 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:29:33,417 INFO L470 AbstractCegarLoop]: Abstraction has 44 states and 49 transitions. [2021-11-21 00:29:33,417 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 4 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:29:33,418 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 49 transitions. [2021-11-21 00:29:33,418 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-11-21 00:29:33,419 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:29:33,419 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:29:33,419 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-21 00:29:33,419 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr11ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 8 more)] === [2021-11-21 00:29:33,421 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:29:33,421 INFO L85 PathProgramCache]: Analyzing trace with hash 1748530515, now seen corresponding path program 1 times [2021-11-21 00:29:33,421 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:29:33,421 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1912192779] [2021-11-21 00:29:33,421 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:29:33,422 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:29:33,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:29:33,569 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:29:33,569 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:29:33,570 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1912192779] [2021-11-21 00:29:33,570 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1912192779] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:29:33,570 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1235343635] [2021-11-21 00:29:33,570 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:29:33,570 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:29:33,571 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03ba479e-94ca-4db9-8bd9-9a5c222b13d3/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:29:33,572 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03ba479e-94ca-4db9-8bd9-9a5c222b13d3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:29:33,576 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03ba479e-94ca-4db9-8bd9-9a5c222b13d3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-21 00:29:33,636 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:29:33,637 INFO L263 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-21 00:29:33,639 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:29:33,711 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:29:33,711 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:29:33,956 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:29:33,956 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1235343635] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:29:33,956 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1238159587] [2021-11-21 00:29:33,959 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-21 00:29:33,959 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:29:33,961 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:29:33,961 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:29:33,961 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:29:34,011 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-21 00:29:34,080 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-21 00:29:34,205 INFO L354 Elim1Store]: treesize reduction 21, result has 38.2 percent of original size [2021-11-21 00:29:34,206 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 142 treesize of output 143 [2021-11-21 00:29:34,662 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 00:29:34,798 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 00:29:35,552 INFO L354 Elim1Store]: treesize reduction 19, result has 32.1 percent of original size [2021-11-21 00:29:35,553 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 67 treesize of output 69 [2021-11-21 00:29:36,008 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:29:36,605 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:29:36,605 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:29:36,605 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 24 [2021-11-21 00:29:36,605 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [3630147] [2021-11-21 00:29:36,605 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:29:36,606 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-11-21 00:29:36,606 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:29:36,606 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-11-21 00:29:36,607 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=324, Invalid=798, Unknown=0, NotChecked=0, Total=1122 [2021-11-21 00:29:36,607 INFO L87 Difference]: Start difference. First operand 44 states and 49 transitions. Second operand has 25 states, 25 states have (on average 2.2) internal successors, (55), 24 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:29:36,708 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:29:36,708 INFO L93 Difference]: Finished difference Result 68 states and 73 transitions. [2021-11-21 00:29:36,709 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-11-21 00:29:36,709 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 2.2) internal successors, (55), 24 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 30 [2021-11-21 00:29:36,709 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:29:36,710 INFO L225 Difference]: With dead ends: 68 [2021-11-21 00:29:36,710 INFO L226 Difference]: Without dead ends: 68 [2021-11-21 00:29:36,711 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 67 SyntacticMatches, 1 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 374 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=324, Invalid=798, Unknown=0, NotChecked=0, Total=1122 [2021-11-21 00:29:36,712 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 22 mSDsluCounter, 102 mSDsCounter, 0 mSdLazyCounter, 74 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 98 SdHoareTripleChecker+Invalid, 89 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 74 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:29:36,712 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [22 Valid, 98 Invalid, 89 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 74 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:29:36,713 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2021-11-21 00:29:36,717 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 68. [2021-11-21 00:29:36,718 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 64 states have (on average 1.140625) internal successors, (73), 67 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:29:36,719 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 73 transitions. [2021-11-21 00:29:36,722 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 73 transitions. Word has length 30 [2021-11-21 00:29:36,722 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:29:36,722 INFO L470 AbstractCegarLoop]: Abstraction has 68 states and 73 transitions. [2021-11-21 00:29:36,723 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 2.2) internal successors, (55), 24 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:29:36,723 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 73 transitions. [2021-11-21 00:29:36,724 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-11-21 00:29:36,729 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:29:36,729 INFO L514 BasicCegarLoop]: trace histogram [22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:29:36,766 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03ba479e-94ca-4db9-8bd9-9a5c222b13d3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2021-11-21 00:29:36,944 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03ba479e-94ca-4db9-8bd9-9a5c222b13d3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:29:36,944 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr11ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 8 more)] === [2021-11-21 00:29:36,945 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:29:36,945 INFO L85 PathProgramCache]: Analyzing trace with hash 143341699, now seen corresponding path program 2 times [2021-11-21 00:29:36,945 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:29:36,945 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1971348422] [2021-11-21 00:29:36,945 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:29:36,945 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:29:37,007 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:29:37,374 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:29:37,374 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:29:37,374 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1971348422] [2021-11-21 00:29:37,374 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1971348422] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:29:37,374 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1140772929] [2021-11-21 00:29:37,374 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 00:29:37,374 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:29:37,375 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03ba479e-94ca-4db9-8bd9-9a5c222b13d3/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:29:37,375 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03ba479e-94ca-4db9-8bd9-9a5c222b13d3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:29:37,376 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03ba479e-94ca-4db9-8bd9-9a5c222b13d3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-21 00:29:37,414 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 1 check-sat command(s) [2021-11-21 00:29:37,415 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:29:37,415 INFO L263 TraceCheckSpWp]: Trace formula consists of 47 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-21 00:29:37,418 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:29:37,714 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 484 trivial. 0 not checked. [2021-11-21 00:29:37,714 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 00:29:37,714 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1140772929] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:29:37,715 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 00:29:37,715 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [24] total 26 [2021-11-21 00:29:37,718 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1829108880] [2021-11-21 00:29:37,718 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:29:37,720 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 00:29:37,720 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:29:37,720 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 00:29:37,721 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=304, Invalid=398, Unknown=0, NotChecked=0, Total=702 [2021-11-21 00:29:37,721 INFO L87 Difference]: Start difference. First operand 68 states and 73 transitions. Second operand has 4 states, 3 states have (on average 4.0) internal successors, (12), 3 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:29:37,735 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:29:37,735 INFO L93 Difference]: Finished difference Result 67 states and 72 transitions. [2021-11-21 00:29:37,735 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 00:29:37,736 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 4.0) internal successors, (12), 3 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 54 [2021-11-21 00:29:37,737 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:29:37,737 INFO L225 Difference]: With dead ends: 67 [2021-11-21 00:29:37,737 INFO L226 Difference]: Without dead ends: 63 [2021-11-21 00:29:37,738 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=304, Invalid=398, Unknown=0, NotChecked=0, Total=702 [2021-11-21 00:29:37,739 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 9 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 10 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 22 SdHoareTripleChecker+Invalid, 18 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 10 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 8 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 00:29:37,740 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 22 Invalid, 18 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 10 Invalid, 0 Unknown, 8 Unchecked, 0.0s Time] [2021-11-21 00:29:37,741 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2021-11-21 00:29:37,751 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2021-11-21 00:29:37,752 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 60 states have (on average 1.1166666666666667) internal successors, (67), 62 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:29:37,753 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 67 transitions. [2021-11-21 00:29:37,754 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 67 transitions. Word has length 54 [2021-11-21 00:29:37,754 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:29:37,754 INFO L470 AbstractCegarLoop]: Abstraction has 63 states and 67 transitions. [2021-11-21 00:29:37,754 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 4.0) internal successors, (12), 3 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:29:37,755 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 67 transitions. [2021-11-21 00:29:37,761 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-11-21 00:29:37,763 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:29:37,764 INFO L514 BasicCegarLoop]: trace histogram [22, 22, 2, 2, 1, 1, 1, 1, 1, 1] [2021-11-21 00:29:37,798 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03ba479e-94ca-4db9-8bd9-9a5c222b13d3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-21 00:29:37,964 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03ba479e-94ca-4db9-8bd9-9a5c222b13d3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-11-21 00:29:37,964 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 8 more)] === [2021-11-21 00:29:37,965 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:29:37,965 INFO L85 PathProgramCache]: Analyzing trace with hash 144676370, now seen corresponding path program 1 times [2021-11-21 00:29:37,965 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:29:37,965 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [457830215] [2021-11-21 00:29:37,965 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:29:37,965 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:29:37,993 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:29:38,327 INFO L134 CoverageAnalysis]: Checked inductivity of 487 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-21 00:29:38,327 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:29:38,327 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [457830215] [2021-11-21 00:29:38,327 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [457830215] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:29:38,327 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [300584560] [2021-11-21 00:29:38,327 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:29:38,328 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:29:38,328 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03ba479e-94ca-4db9-8bd9-9a5c222b13d3/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:29:38,329 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03ba479e-94ca-4db9-8bd9-9a5c222b13d3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:29:38,351 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03ba479e-94ca-4db9-8bd9-9a5c222b13d3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-21 00:29:38,401 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:29:38,402 INFO L263 TraceCheckSpWp]: Trace formula consists of 269 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-21 00:29:38,405 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:29:38,544 INFO L134 CoverageAnalysis]: Checked inductivity of 487 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-21 00:29:38,544 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:29:39,361 INFO L134 CoverageAnalysis]: Checked inductivity of 487 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-21 00:29:39,362 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [300584560] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:29:39,362 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [132513765] [2021-11-21 00:29:39,364 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 00:29:39,364 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:29:39,364 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:29:39,364 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:29:39,364 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:29:39,386 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-21 00:29:39,480 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 00:29:39,595 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:29:39,596 INFO L388 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 152 treesize of output 142 [2021-11-21 00:29:39,875 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 00:29:39,979 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 00:29:42,151 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:29:42,681 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:29:42,682 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:29:42,682 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 48 [2021-11-21 00:29:42,682 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1168584907] [2021-11-21 00:29:42,682 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:29:42,682 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2021-11-21 00:29:42,683 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:29:42,684 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-11-21 00:29:42,685 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1198, Invalid=1994, Unknown=0, NotChecked=0, Total=3192 [2021-11-21 00:29:42,685 INFO L87 Difference]: Start difference. First operand 63 states and 67 transitions. Second operand has 49 states, 49 states have (on average 2.061224489795918) internal successors, (101), 48 states have internal predecessors, (101), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:29:42,873 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:29:42,873 INFO L93 Difference]: Finished difference Result 111 states and 115 transitions. [2021-11-21 00:29:42,873 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2021-11-21 00:29:42,874 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 2.061224489795918) internal successors, (101), 48 states have internal predecessors, (101), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 54 [2021-11-21 00:29:42,876 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:29:42,879 INFO L225 Difference]: With dead ends: 111 [2021-11-21 00:29:42,879 INFO L226 Difference]: Without dead ends: 111 [2021-11-21 00:29:42,880 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 184 GetRequests, 129 SyntacticMatches, 0 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 646 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1198, Invalid=1994, Unknown=0, NotChecked=0, Total=3192 [2021-11-21 00:29:42,881 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 69 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 116 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 69 SdHoareTripleChecker+Valid, 45 SdHoareTripleChecker+Invalid, 146 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 116 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 00:29:42,882 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [69 Valid, 45 Invalid, 146 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 116 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 00:29:42,883 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2021-11-21 00:29:42,887 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 111. [2021-11-21 00:29:42,887 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 111 states, 108 states have (on average 1.0648148148148149) internal successors, (115), 110 states have internal predecessors, (115), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:29:42,888 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 115 transitions. [2021-11-21 00:29:42,889 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 115 transitions. Word has length 54 [2021-11-21 00:29:42,889 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:29:42,889 INFO L470 AbstractCegarLoop]: Abstraction has 111 states and 115 transitions. [2021-11-21 00:29:42,890 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 49 states have (on average 2.061224489795918) internal successors, (101), 48 states have internal predecessors, (101), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:29:42,890 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 115 transitions. [2021-11-21 00:29:42,891 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2021-11-21 00:29:42,891 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:29:42,891 INFO L514 BasicCegarLoop]: trace histogram [46, 46, 2, 2, 1, 1, 1, 1, 1, 1] [2021-11-21 00:29:42,917 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03ba479e-94ca-4db9-8bd9-9a5c222b13d3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-21 00:29:43,104 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03ba479e-94ca-4db9-8bd9-9a5c222b13d3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-11-21 00:29:43,104 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 8 more)] === [2021-11-21 00:29:43,105 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:29:43,105 INFO L85 PathProgramCache]: Analyzing trace with hash -1793758094, now seen corresponding path program 2 times [2021-11-21 00:29:43,105 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:29:43,105 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1136596295] [2021-11-21 00:29:43,105 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:29:43,105 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:29:43,163 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:29:44,060 INFO L134 CoverageAnalysis]: Checked inductivity of 2119 backedges. 0 proven. 2116 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-21 00:29:44,060 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:29:44,060 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1136596295] [2021-11-21 00:29:44,060 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1136596295] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:29:44,061 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [930827702] [2021-11-21 00:29:44,061 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 00:29:44,061 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:29:44,061 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03ba479e-94ca-4db9-8bd9-9a5c222b13d3/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:29:44,062 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03ba479e-94ca-4db9-8bd9-9a5c222b13d3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:29:44,064 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03ba479e-94ca-4db9-8bd9-9a5c222b13d3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-21 00:29:44,104 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-21 00:29:44,104 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:29:44,105 INFO L263 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-21 00:29:44,110 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:29:44,115 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-21 00:29:44,775 INFO L134 CoverageAnalysis]: Checked inductivity of 2119 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 2116 trivial. 0 not checked. [2021-11-21 00:29:44,775 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:29:45,596 INFO L134 CoverageAnalysis]: Checked inductivity of 2119 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 2116 trivial. 0 not checked. [2021-11-21 00:29:45,597 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [930827702] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:29:45,597 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1365989943] [2021-11-21 00:29:45,600 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 00:29:45,600 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:29:45,601 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:29:45,601 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:29:45,601 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:29:45,620 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-21 00:29:45,724 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 00:29:45,838 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:29:45,839 INFO L388 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 152 treesize of output 142 [2021-11-21 00:29:46,114 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 00:29:46,194 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 00:29:48,317 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:29:49,073 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:29:49,073 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:29:49,073 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 6, 6] total 60 [2021-11-21 00:29:49,073 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [851461670] [2021-11-21 00:29:49,073 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:29:49,074 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 61 states [2021-11-21 00:29:49,074 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:29:49,075 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2021-11-21 00:29:49,076 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1248, Invalid=3444, Unknown=0, NotChecked=0, Total=4692 [2021-11-21 00:29:49,076 INFO L87 Difference]: Start difference. First operand 111 states and 115 transitions. Second operand has 61 states, 61 states have (on average 2.0327868852459017) internal successors, (124), 60 states have internal predecessors, (124), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:29:51,848 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:29:51,848 INFO L93 Difference]: Finished difference Result 135 states and 146 transitions. [2021-11-21 00:29:51,849 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2021-11-21 00:29:51,849 INFO L78 Accepts]: Start accepts. Automaton has has 61 states, 61 states have (on average 2.0327868852459017) internal successors, (124), 60 states have internal predecessors, (124), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 102 [2021-11-21 00:29:51,850 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:29:51,853 INFO L225 Difference]: With dead ends: 135 [2021-11-21 00:29:51,853 INFO L226 Difference]: Without dead ends: 135 [2021-11-21 00:29:51,858 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 404 GetRequests, 285 SyntacticMatches, 1 SemanticMatches, 118 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2534 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=4102, Invalid=10178, Unknown=0, NotChecked=0, Total=14280 [2021-11-21 00:29:51,859 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 303 mSDsluCounter, 98 mSDsCounter, 0 mSdLazyCounter, 279 mSolverCounterSat, 207 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 303 SdHoareTripleChecker+Valid, 106 SdHoareTripleChecker+Invalid, 516 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 207 IncrementalHoareTripleChecker+Valid, 279 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 30 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 00:29:51,860 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [303 Valid, 106 Invalid, 516 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [207 Valid, 279 Invalid, 0 Unknown, 30 Unchecked, 0.3s Time] [2021-11-21 00:29:51,862 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2021-11-21 00:29:51,877 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 125. [2021-11-21 00:29:51,878 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 125 states, 123 states have (on average 1.08130081300813) internal successors, (133), 124 states have internal predecessors, (133), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:29:51,880 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 133 transitions. [2021-11-21 00:29:51,882 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 133 transitions. Word has length 102 [2021-11-21 00:29:51,883 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:29:51,884 INFO L470 AbstractCegarLoop]: Abstraction has 125 states and 133 transitions. [2021-11-21 00:29:51,884 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 61 states, 61 states have (on average 2.0327868852459017) internal successors, (124), 60 states have internal predecessors, (124), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:29:51,885 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 133 transitions. [2021-11-21 00:29:51,886 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2021-11-21 00:29:51,889 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:29:51,889 INFO L514 BasicCegarLoop]: trace histogram [47, 47, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:29:51,925 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03ba479e-94ca-4db9-8bd9-9a5c222b13d3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-21 00:29:52,108 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03ba479e-94ca-4db9-8bd9-9a5c222b13d3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:29:52,109 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 8 more)] === [2021-11-21 00:29:52,109 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:29:52,109 INFO L85 PathProgramCache]: Analyzing trace with hash 2032458332, now seen corresponding path program 1 times [2021-11-21 00:29:52,109 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:29:52,109 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [154101978] [2021-11-21 00:29:52,109 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:29:52,110 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:29:52,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:29:52,185 INFO L134 CoverageAnalysis]: Checked inductivity of 2213 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2211 trivial. 0 not checked. [2021-11-21 00:29:52,185 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:29:52,185 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [154101978] [2021-11-21 00:29:52,185 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [154101978] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:29:52,186 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:29:52,186 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-21 00:29:52,186 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1708526775] [2021-11-21 00:29:52,191 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:29:52,191 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:29:52,192 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:29:52,192 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:29:52,192 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:29:52,192 INFO L87 Difference]: Start difference. First operand 125 states and 133 transitions. Second operand has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 3 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:29:52,203 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:29:52,203 INFO L93 Difference]: Finished difference Result 122 states and 128 transitions. [2021-11-21 00:29:52,204 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:29:52,204 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 3 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 106 [2021-11-21 00:29:52,204 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:29:52,205 INFO L225 Difference]: With dead ends: 122 [2021-11-21 00:29:52,205 INFO L226 Difference]: Without dead ends: 121 [2021-11-21 00:29:52,205 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:29:52,211 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 0 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 15 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 12 SdHoareTripleChecker+Invalid, 15 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 15 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 00:29:52,213 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 12 Invalid, 15 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 15 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 00:29:52,214 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2021-11-21 00:29:52,216 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 121. [2021-11-21 00:29:52,217 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 121 states, 120 states have (on average 1.0416666666666667) internal successors, (125), 120 states have internal predecessors, (125), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:29:52,217 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 125 transitions. [2021-11-21 00:29:52,217 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 125 transitions. Word has length 106 [2021-11-21 00:29:52,218 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:29:52,218 INFO L470 AbstractCegarLoop]: Abstraction has 121 states and 125 transitions. [2021-11-21 00:29:52,218 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 3 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:29:52,218 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 125 transitions. [2021-11-21 00:29:52,220 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2021-11-21 00:29:52,220 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:29:52,220 INFO L514 BasicCegarLoop]: trace histogram [47, 47, 4, 4, 3, 3, 3, 1, 1, 1] [2021-11-21 00:29:52,221 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2021-11-21 00:29:52,221 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 8 more)] === [2021-11-21 00:29:52,221 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:29:52,221 INFO L85 PathProgramCache]: Analyzing trace with hash 1017163094, now seen corresponding path program 3 times [2021-11-21 00:29:52,222 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:29:52,222 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [193675028] [2021-11-21 00:29:52,222 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:29:52,222 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:29:52,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:29:53,229 INFO L134 CoverageAnalysis]: Checked inductivity of 2233 backedges. 0 proven. 2209 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-21 00:29:53,229 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:29:53,229 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [193675028] [2021-11-21 00:29:53,229 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [193675028] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:29:53,230 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1762016676] [2021-11-21 00:29:53,230 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 00:29:53,230 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:29:53,230 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03ba479e-94ca-4db9-8bd9-9a5c222b13d3/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:29:53,231 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03ba479e-94ca-4db9-8bd9-9a5c222b13d3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:29:53,232 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03ba479e-94ca-4db9-8bd9-9a5c222b13d3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-21 00:29:55,137 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 00:29:55,137 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:29:55,144 INFO L263 TraceCheckSpWp]: Trace formula consists of 553 conjuncts, 49 conjunts are in the unsatisfiable core [2021-11-21 00:29:55,149 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:29:55,389 INFO L134 CoverageAnalysis]: Checked inductivity of 2233 backedges. 0 proven. 2209 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-21 00:29:55,389 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:29:58,038 INFO L134 CoverageAnalysis]: Checked inductivity of 2233 backedges. 0 proven. 2209 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-21 00:29:58,039 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1762016676] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:29:58,039 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1941018190] [2021-11-21 00:29:58,041 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 00:29:58,041 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:29:58,042 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:29:58,042 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:29:58,042 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:29:58,069 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-21 00:29:58,156 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 00:29:58,275 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:29:58,276 INFO L388 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 152 treesize of output 142 [2021-11-21 00:29:58,510 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 00:29:58,611 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 00:30:00,680 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:30:01,351 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:30:01,352 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:30:01,352 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49, 49] total 98 [2021-11-21 00:30:01,352 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [228209898] [2021-11-21 00:30:01,352 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:30:01,353 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 99 states [2021-11-21 00:30:01,353 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:30:01,355 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 99 interpolants. [2021-11-21 00:30:01,358 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4873, Invalid=6469, Unknown=0, NotChecked=0, Total=11342 [2021-11-21 00:30:01,358 INFO L87 Difference]: Start difference. First operand 121 states and 125 transitions. Second operand has 99 states, 99 states have (on average 2.0303030303030303) internal successors, (201), 98 states have internal predecessors, (201), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:30:01,723 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:30:01,723 INFO L93 Difference]: Finished difference Result 219 states and 223 transitions. [2021-11-21 00:30:01,723 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 98 states. [2021-11-21 00:30:01,724 INFO L78 Accepts]: Start accepts. Automaton has has 99 states, 99 states have (on average 2.0303030303030303) internal successors, (201), 98 states have internal predecessors, (201), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 114 [2021-11-21 00:30:01,724 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:30:01,725 INFO L225 Difference]: With dead ends: 219 [2021-11-21 00:30:01,725 INFO L226 Difference]: Without dead ends: 219 [2021-11-21 00:30:01,729 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 389 GetRequests, 284 SyntacticMatches, 0 SemanticMatches, 105 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1346 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=4873, Invalid=6469, Unknown=0, NotChecked=0, Total=11342 [2021-11-21 00:30:01,730 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 96 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 212 mSolverCounterSat, 55 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 96 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 267 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 55 IncrementalHoareTripleChecker+Valid, 212 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 00:30:01,731 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [96 Valid, 24 Invalid, 267 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [55 Valid, 212 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 00:30:01,732 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 219 states. [2021-11-21 00:30:01,735 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 219 to 219. [2021-11-21 00:30:01,736 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 219 states, 218 states have (on average 1.0229357798165137) internal successors, (223), 218 states have internal predecessors, (223), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:30:01,737 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 219 states to 219 states and 223 transitions. [2021-11-21 00:30:01,737 INFO L78 Accepts]: Start accepts. Automaton has 219 states and 223 transitions. Word has length 114 [2021-11-21 00:30:01,738 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:30:01,738 INFO L470 AbstractCegarLoop]: Abstraction has 219 states and 223 transitions. [2021-11-21 00:30:01,738 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 99 states, 99 states have (on average 2.0303030303030303) internal successors, (201), 98 states have internal predecessors, (201), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:30:01,738 INFO L276 IsEmpty]: Start isEmpty. Operand 219 states and 223 transitions. [2021-11-21 00:30:01,740 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 213 [2021-11-21 00:30:01,741 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:30:01,741 INFO L514 BasicCegarLoop]: trace histogram [96, 96, 4, 4, 3, 3, 3, 1, 1, 1] [2021-11-21 00:30:01,781 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03ba479e-94ca-4db9-8bd9-9a5c222b13d3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-21 00:30:01,956 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03ba479e-94ca-4db9-8bd9-9a5c222b13d3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-11-21 00:30:01,956 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 8 more)] === [2021-11-21 00:30:01,957 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:30:01,957 INFO L85 PathProgramCache]: Analyzing trace with hash 780600794, now seen corresponding path program 4 times [2021-11-21 00:30:01,957 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:30:01,957 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1206771824] [2021-11-21 00:30:01,957 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:30:01,957 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:30:02,146 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:30:05,682 INFO L134 CoverageAnalysis]: Checked inductivity of 9240 backedges. 0 proven. 9216 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-21 00:30:05,683 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:30:05,683 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1206771824] [2021-11-21 00:30:05,683 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1206771824] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:30:05,683 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1581406893] [2021-11-21 00:30:05,683 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 00:30:05,683 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:30:05,684 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03ba479e-94ca-4db9-8bd9-9a5c222b13d3/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:30:05,684 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03ba479e-94ca-4db9-8bd9-9a5c222b13d3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:30:05,685 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03ba479e-94ca-4db9-8bd9-9a5c222b13d3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-21 00:30:05,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:30:05,878 INFO L263 TraceCheckSpWp]: Trace formula consists of 1043 conjuncts, 98 conjunts are in the unsatisfiable core [2021-11-21 00:30:05,886 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:30:06,355 INFO L134 CoverageAnalysis]: Checked inductivity of 9240 backedges. 0 proven. 9216 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-21 00:30:06,356 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:30:15,886 INFO L134 CoverageAnalysis]: Checked inductivity of 9240 backedges. 0 proven. 9216 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-21 00:30:15,886 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1581406893] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:30:15,887 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2059560355] [2021-11-21 00:30:15,888 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 00:30:15,889 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:30:15,889 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:30:15,889 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:30:15,889 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:30:15,903 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-21 00:30:15,971 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-21 00:30:16,071 INFO L354 Elim1Store]: treesize reduction 21, result has 38.2 percent of original size [2021-11-21 00:30:16,072 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 142 treesize of output 143 [2021-11-21 00:30:16,399 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 00:30:16,479 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 00:30:18,406 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:30:19,333 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:30:19,334 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:30:19,334 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [98, 98, 98] total 196 [2021-11-21 00:30:19,334 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1193808080] [2021-11-21 00:30:19,334 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:30:19,335 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 197 states [2021-11-21 00:30:19,335 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:30:19,338 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 197 interpolants. [2021-11-21 00:30:19,343 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19328, Invalid=22492, Unknown=0, NotChecked=0, Total=41820 [2021-11-21 00:30:19,344 INFO L87 Difference]: Start difference. First operand 219 states and 223 transitions. Second operand has 197 states, 197 states have (on average 2.015228426395939) internal successors, (397), 196 states have internal predecessors, (397), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:30:20,519 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:30:20,519 INFO L93 Difference]: Finished difference Result 415 states and 419 transitions. [2021-11-21 00:30:20,519 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 196 states. [2021-11-21 00:30:20,520 INFO L78 Accepts]: Start accepts. Automaton has has 197 states, 197 states have (on average 2.015228426395939) internal successors, (397), 196 states have internal predecessors, (397), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 212 [2021-11-21 00:30:20,520 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:30:20,523 INFO L225 Difference]: With dead ends: 415 [2021-11-21 00:30:20,523 INFO L226 Difference]: Without dead ends: 415 [2021-11-21 00:30:20,527 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 732 GetRequests, 529 SyntacticMatches, 0 SemanticMatches, 203 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2718 ImplicationChecksByTransitivity, 13.2s TimeCoverageRelationStatistics Valid=19328, Invalid=22492, Unknown=0, NotChecked=0, Total=41820 [2021-11-21 00:30:20,527 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 291 mSDsluCounter, 81 mSDsCounter, 0 mSdLazyCounter, 430 mSolverCounterSat, 105 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 291 SdHoareTripleChecker+Valid, 60 SdHoareTripleChecker+Invalid, 535 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 105 IncrementalHoareTripleChecker+Valid, 430 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-21 00:30:20,528 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [291 Valid, 60 Invalid, 535 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [105 Valid, 430 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-21 00:30:20,529 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 415 states. [2021-11-21 00:30:20,535 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 415 to 415. [2021-11-21 00:30:20,536 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 415 states, 414 states have (on average 1.0120772946859904) internal successors, (419), 414 states have internal predecessors, (419), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:30:20,538 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 415 states to 415 states and 419 transitions. [2021-11-21 00:30:20,538 INFO L78 Accepts]: Start accepts. Automaton has 415 states and 419 transitions. Word has length 212 [2021-11-21 00:30:20,538 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:30:20,539 INFO L470 AbstractCegarLoop]: Abstraction has 415 states and 419 transitions. [2021-11-21 00:30:20,539 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 197 states, 197 states have (on average 2.015228426395939) internal successors, (397), 196 states have internal predecessors, (397), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:30:20,539 INFO L276 IsEmpty]: Start isEmpty. Operand 415 states and 419 transitions. [2021-11-21 00:30:20,546 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 409 [2021-11-21 00:30:20,546 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:30:20,547 INFO L514 BasicCegarLoop]: trace histogram [194, 194, 4, 4, 3, 3, 3, 1, 1, 1] [2021-11-21 00:30:20,582 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03ba479e-94ca-4db9-8bd9-9a5c222b13d3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-21 00:30:20,772 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03ba479e-94ca-4db9-8bd9-9a5c222b13d3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-11-21 00:30:20,772 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 8 more)] === [2021-11-21 00:30:20,773 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:30:20,773 INFO L85 PathProgramCache]: Analyzing trace with hash -1149750302, now seen corresponding path program 5 times [2021-11-21 00:30:20,773 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:30:20,773 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [717168744] [2021-11-21 00:30:20,773 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:30:20,773 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:30:21,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:30:33,959 INFO L134 CoverageAnalysis]: Checked inductivity of 37660 backedges. 0 proven. 37636 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-21 00:30:33,959 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:30:33,959 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [717168744] [2021-11-21 00:30:33,959 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [717168744] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:30:33,959 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [705573980] [2021-11-21 00:30:33,959 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 00:30:33,959 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:30:33,960 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03ba479e-94ca-4db9-8bd9-9a5c222b13d3/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:30:33,960 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03ba479e-94ca-4db9-8bd9-9a5c222b13d3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:30:33,961 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03ba479e-94ca-4db9-8bd9-9a5c222b13d3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-21 00:30:34,041 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-21 00:30:34,042 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:30:34,043 INFO L263 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-21 00:30:34,050 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:30:34,054 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-21 00:30:36,630 INFO L134 CoverageAnalysis]: Checked inductivity of 37660 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 37636 trivial. 0 not checked. [2021-11-21 00:30:36,630 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:30:39,608 INFO L134 CoverageAnalysis]: Checked inductivity of 37660 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 37636 trivial. 0 not checked. [2021-11-21 00:30:39,609 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [705573980] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:30:39,609 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1161620140] [2021-11-21 00:30:39,611 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 00:30:39,611 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:30:39,611 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:30:39,612 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:30:39,612 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:30:39,647 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-21 00:30:39,735 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-21 00:30:39,854 INFO L354 Elim1Store]: treesize reduction 21, result has 38.2 percent of original size [2021-11-21 00:30:39,854 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 142 treesize of output 143 [2021-11-21 00:30:40,229 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 00:30:40,339 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 00:30:42,798 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:30:44,459 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:30:44,459 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:30:44,460 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [196, 8, 9] total 213 [2021-11-21 00:30:44,460 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1296495280] [2021-11-21 00:30:44,460 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:30:44,461 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 214 states [2021-11-21 00:30:44,462 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:30:44,466 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 214 interpolants. [2021-11-21 00:30:44,470 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19419, Invalid=29643, Unknown=0, NotChecked=0, Total=49062 [2021-11-21 00:30:44,471 INFO L87 Difference]: Start difference. First operand 415 states and 419 transitions. Second operand has 214 states, 214 states have (on average 2.05607476635514) internal successors, (440), 213 states have internal predecessors, (440), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:31:14,256 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:31:14,256 INFO L93 Difference]: Finished difference Result 468 states and 477 transitions. [2021-11-21 00:31:14,257 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 218 states. [2021-11-21 00:31:14,257 INFO L78 Accepts]: Start accepts. Automaton has has 214 states, 214 states have (on average 2.05607476635514) internal successors, (440), 213 states have internal predecessors, (440), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 408 [2021-11-21 00:31:14,258 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:31:14,260 INFO L225 Difference]: With dead ends: 468 [2021-11-21 00:31:14,260 INFO L226 Difference]: Without dead ends: 468 [2021-11-21 00:31:14,269 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1638 GetRequests, 1198 SyntacticMatches, 6 SemanticMatches, 434 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30314 ImplicationChecksByTransitivity, 43.6s TimeCoverageRelationStatistics Valid=62855, Invalid=126805, Unknown=0, NotChecked=0, Total=189660 [2021-11-21 00:31:14,270 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 1129 mSDsluCounter, 61 mSDsCounter, 0 mSdLazyCounter, 571 mSolverCounterSat, 805 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1129 SdHoareTripleChecker+Valid, 67 SdHoareTripleChecker+Invalid, 1423 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 805 IncrementalHoareTripleChecker+Valid, 571 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 47 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-21 00:31:14,270 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1129 Valid, 67 Invalid, 1423 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [805 Valid, 571 Invalid, 0 Unknown, 47 Unchecked, 0.8s Time] [2021-11-21 00:31:14,271 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 468 states. [2021-11-21 00:31:14,277 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 468 to 445. [2021-11-21 00:31:14,278 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 445 states, 444 states have (on average 1.0202702702702702) internal successors, (453), 444 states have internal predecessors, (453), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:31:14,280 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 445 states to 445 states and 453 transitions. [2021-11-21 00:31:14,280 INFO L78 Accepts]: Start accepts. Automaton has 445 states and 453 transitions. Word has length 408 [2021-11-21 00:31:14,281 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:31:14,281 INFO L470 AbstractCegarLoop]: Abstraction has 445 states and 453 transitions. [2021-11-21 00:31:14,282 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 214 states, 214 states have (on average 2.05607476635514) internal successors, (440), 213 states have internal predecessors, (440), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:31:14,282 INFO L276 IsEmpty]: Start isEmpty. Operand 445 states and 453 transitions. [2021-11-21 00:31:14,290 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 431 [2021-11-21 00:31:14,290 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:31:14,291 INFO L514 BasicCegarLoop]: trace histogram [195, 195, 8, 8, 7, 7, 7, 1, 1, 1] [2021-11-21 00:31:14,328 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03ba479e-94ca-4db9-8bd9-9a5c222b13d3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-21 00:31:14,504 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03ba479e-94ca-4db9-8bd9-9a5c222b13d3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:31:14,504 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 8 more)] === [2021-11-21 00:31:14,505 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:31:14,505 INFO L85 PathProgramCache]: Analyzing trace with hash -1961133338, now seen corresponding path program 6 times [2021-11-21 00:31:14,505 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:31:14,505 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [841808473] [2021-11-21 00:31:14,505 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:31:14,505 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:31:14,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:31:27,452 INFO L134 CoverageAnalysis]: Checked inductivity of 38151 backedges. 0 proven. 38025 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2021-11-21 00:31:27,452 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:31:27,452 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [841808473] [2021-11-21 00:31:27,452 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [841808473] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:31:27,452 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1990959957] [2021-11-21 00:31:27,453 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 00:31:27,453 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:31:27,453 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03ba479e-94ca-4db9-8bd9-9a5c222b13d3/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:31:27,453 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03ba479e-94ca-4db9-8bd9-9a5c222b13d3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:31:27,454 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03ba479e-94ca-4db9-8bd9-9a5c222b13d3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process