./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/array-memsafety/strreplace-alloca-2.i --full-output --architecture 32bit -------------------------------------------------------------------------------- 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_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/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_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/array-memsafety/strreplace-alloca-2.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/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 32bit --witnessprinter.graph.data.programhash 961e7f6fbd61acd9d4f1771460dcf26fd486b3de35e5e0e3ca8e6e03bda0fabc --- Real Ultimate output --- This is Ultimate 0.2.1-dev-53f42b1 [2021-11-20 22:47:37,680 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-20 22:47:37,682 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-20 22:47:37,730 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-20 22:47:37,731 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-20 22:47:37,735 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-20 22:47:37,738 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-20 22:47:37,742 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-20 22:47:37,745 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-20 22:47:37,752 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-20 22:47:37,754 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-20 22:47:37,755 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-20 22:47:37,756 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-20 22:47:37,759 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-20 22:47:37,762 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-20 22:47:37,766 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-20 22:47:37,767 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-20 22:47:37,768 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-20 22:47:37,770 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-20 22:47:37,779 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-20 22:47:37,781 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-20 22:47:37,782 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-20 22:47:37,784 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-20 22:47:37,784 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-20 22:47:37,788 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-20 22:47:37,788 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-20 22:47:37,789 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-20 22:47:37,790 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-20 22:47:37,790 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-20 22:47:37,791 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-20 22:47:37,792 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-20 22:47:37,793 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-20 22:47:37,794 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-20 22:47:37,795 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-20 22:47:37,796 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-20 22:47:37,796 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-20 22:47:37,797 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-20 22:47:37,797 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-20 22:47:37,797 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-20 22:47:37,798 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-20 22:47:37,799 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-20 22:47:37,800 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2021-11-20 22:47:37,826 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-20 22:47:37,826 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-20 22:47:37,827 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-20 22:47:37,827 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-20 22:47:37,828 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-20 22:47:37,828 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-20 22:47:37,828 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-20 22:47:37,828 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-20 22:47:37,828 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-20 22:47:37,829 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-20 22:47:37,829 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-20 22:47:37,829 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-20 22:47:37,829 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-20 22:47:37,829 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-20 22:47:37,830 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-20 22:47:37,830 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-20 22:47:37,830 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-20 22:47:37,830 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-20 22:47:37,831 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-11-20 22:47:37,831 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-11-20 22:47:37,831 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-20 22:47:37,832 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-20 22:47:37,832 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-11-20 22:47:37,832 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-20 22:47:37,832 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-20 22:47:37,832 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-20 22:47:37,833 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-11-20 22:47:37,833 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-11-20 22:47:37,833 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2021-11-20 22:47:37,833 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-20 22:47:37,833 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-20 22:47:37,834 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-20 22:47:37,834 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-20 22:47:37,834 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-20 22:47:37,834 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-20 22:47:37,835 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-20 22:47:37,835 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-20 22:47:37,835 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-20 22:47:37,835 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-20 22:47:37,835 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-20 22:47:37,836 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-20 22:47:37,836 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-20 22:47:37,838 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_d0c42b9e-8dee-4b83-8a12-12369b763c15/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 961e7f6fbd61acd9d4f1771460dcf26fd486b3de35e5e0e3ca8e6e03bda0fabc [2021-11-20 22:47:38,143 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-20 22:47:38,173 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-20 22:47:38,175 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-20 22:47:38,176 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-20 22:47:38,178 INFO L275 PluginConnector]: CDTParser initialized [2021-11-20 22:47:38,179 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/../../sv-benchmarks/c/array-memsafety/strreplace-alloca-2.i [2021-11-20 22:47:38,249 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/data/09e216000/f97b3328008e4c62a4da6de391fdfeb2/FLAG7b277785b [2021-11-20 22:47:38,761 INFO L306 CDTParser]: Found 1 translation units. [2021-11-20 22:47:38,762 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/sv-benchmarks/c/array-memsafety/strreplace-alloca-2.i [2021-11-20 22:47:38,779 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/data/09e216000/f97b3328008e4c62a4da6de391fdfeb2/FLAG7b277785b [2021-11-20 22:47:39,078 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/data/09e216000/f97b3328008e4c62a4da6de391fdfeb2 [2021-11-20 22:47:39,081 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-20 22:47:39,090 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-20 22:47:39,091 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-20 22:47:39,092 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-20 22:47:39,095 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-20 22:47:39,096 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 10:47:39" (1/1) ... [2021-11-20 22:47:39,097 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@15efd969 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:47:39, skipping insertion in model container [2021-11-20 22:47:39,097 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 10:47:39" (1/1) ... [2021-11-20 22:47:39,104 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-20 22:47:39,135 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-20 22:47:39,427 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-20 22:47:39,435 INFO L203 MainTranslator]: Completed pre-run [2021-11-20 22:47:39,472 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-20 22:47:39,520 INFO L208 MainTranslator]: Completed translation [2021-11-20 22:47:39,520 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:47:39 WrapperNode [2021-11-20 22:47:39,521 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-20 22:47:39,522 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-20 22:47:39,522 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-20 22:47:39,523 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-20 22:47:39,530 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:47:39" (1/1) ... [2021-11-20 22:47:39,554 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:47:39" (1/1) ... [2021-11-20 22:47:39,582 INFO L137 Inliner]: procedures = 117, calls = 11, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 62 [2021-11-20 22:47:39,583 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-20 22:47:39,584 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-20 22:47:39,585 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-20 22:47:39,585 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-20 22:47:39,592 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:47:39" (1/1) ... [2021-11-20 22:47:39,593 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:47:39" (1/1) ... [2021-11-20 22:47:39,607 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:47:39" (1/1) ... [2021-11-20 22:47:39,608 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:47:39" (1/1) ... [2021-11-20 22:47:39,615 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:47:39" (1/1) ... [2021-11-20 22:47:39,627 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:47:39" (1/1) ... [2021-11-20 22:47:39,629 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:47:39" (1/1) ... [2021-11-20 22:47:39,635 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-20 22:47:39,636 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-20 22:47:39,640 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-20 22:47:39,640 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-20 22:47:39,641 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:47:39" (1/1) ... [2021-11-20 22:47:39,650 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-20 22:47:39,661 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 22:47:39,682 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-20 22:47:39,694 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-20 22:47:39,724 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-20 22:47:39,725 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-20 22:47:39,726 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-20 22:47:39,726 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-20 22:47:39,726 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-20 22:47:39,726 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-20 22:47:39,848 INFO L236 CfgBuilder]: Building ICFG [2021-11-20 22:47:39,850 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-20 22:47:40,023 INFO L277 CfgBuilder]: Performing block encoding [2021-11-20 22:47:40,077 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-20 22:47:40,078 INFO L301 CfgBuilder]: Removed 2 assume(true) statements. [2021-11-20 22:47:40,080 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 10:47:40 BoogieIcfgContainer [2021-11-20 22:47:40,080 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-20 22:47:40,082 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-20 22:47:40,082 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-20 22:47:40,088 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-20 22:47:40,088 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.11 10:47:39" (1/3) ... [2021-11-20 22:47:40,089 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@16a5f8fd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 10:47:40, skipping insertion in model container [2021-11-20 22:47:40,089 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:47:39" (2/3) ... [2021-11-20 22:47:40,090 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@16a5f8fd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 10:47:40, skipping insertion in model container [2021-11-20 22:47:40,090 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 10:47:40" (3/3) ... [2021-11-20 22:47:40,091 INFO L111 eAbstractionObserver]: Analyzing ICFG strreplace-alloca-2.i [2021-11-20 22:47:40,096 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-20 22:47:40,096 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 11 error locations. [2021-11-20 22:47:40,141 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-20 22:47:40,147 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 [2021-11-20 22:47:40,148 INFO L340 AbstractCegarLoop]: Starting to check reachability of 11 error locations. [2021-11-20 22:47:40,164 INFO L276 IsEmpty]: Start isEmpty. Operand has 24 states, 12 states have (on average 2.25) internal successors, (27), 23 states have internal predecessors, (27), 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) [2021-11-20 22:47:40,177 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2021-11-20 22:47:40,186 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:47:40,187 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1] [2021-11-20 22:47:40,188 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-20 22:47:40,193 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:47:40,199 INFO L85 PathProgramCache]: Analyzing trace with hash 104334, now seen corresponding path program 1 times [2021-11-20 22:47:40,208 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:47:40,208 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [604214522] [2021-11-20 22:47:40,209 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:47:40,209 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:47:40,291 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:47:40,347 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:47:40,348 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:47:40,348 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [604214522] [2021-11-20 22:47:40,349 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [604214522] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 22:47:40,349 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 22:47:40,349 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-11-20 22:47:40,351 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [700970918] [2021-11-20 22:47:40,352 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 22:47:40,355 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 22:47:40,356 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:47:40,385 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 22:47:40,386 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 22:47:40,399 INFO L87 Difference]: Start difference. First operand has 24 states, 12 states have (on average 2.25) internal successors, (27), 23 states have internal predecessors, (27), 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) [2021-11-20 22:47:40,442 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:47:40,442 INFO L93 Difference]: Finished difference Result 22 states and 24 transitions. [2021-11-20 22:47:40,444 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 22:47:40,445 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 [2021-11-20 22:47:40,462 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:47:40,469 INFO L225 Difference]: With dead ends: 22 [2021-11-20 22:47:40,469 INFO L226 Difference]: Without dead ends: 21 [2021-11-20 22:47:40,471 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 [2021-11-20 22:47:40,475 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 19 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 17 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 10 SdHoareTripleChecker+Invalid, 18 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 17 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 22:47:40,476 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 10 Invalid, 18 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 17 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 22:47:40,493 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-11-20 22:47:40,502 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2021-11-20 22:47:40,504 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 20 states have internal predecessors, (23), 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) [2021-11-20 22:47:40,505 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 23 transitions. [2021-11-20 22:47:40,506 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 23 transitions. Word has length 3 [2021-11-20 22:47:40,506 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:47:40,506 INFO L470 AbstractCegarLoop]: Abstraction has 21 states and 23 transitions. [2021-11-20 22:47:40,506 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) [2021-11-20 22:47:40,507 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 23 transitions. [2021-11-20 22:47:40,507 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2021-11-20 22:47:40,507 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:47:40,507 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1] [2021-11-20 22:47:40,508 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-20 22:47:40,508 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-20 22:47:40,509 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:47:40,509 INFO L85 PathProgramCache]: Analyzing trace with hash 104335, now seen corresponding path program 1 times [2021-11-20 22:47:40,509 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:47:40,510 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [405472554] [2021-11-20 22:47:40,510 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:47:40,510 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:47:40,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:47:40,616 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:47:40,616 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:47:40,616 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [405472554] [2021-11-20 22:47:40,617 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [405472554] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 22:47:40,617 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 22:47:40,617 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-20 22:47:40,617 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [622800440] [2021-11-20 22:47:40,618 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 22:47:40,619 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-20 22:47:40,619 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:47:40,619 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-20 22:47:40,620 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-20 22:47:40,620 INFO L87 Difference]: Start difference. First operand 21 states and 23 transitions. Second operand has 4 states, 3 states have (on average 1.0) internal successors, (3), 3 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) [2021-11-20 22:47:40,686 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:47:40,686 INFO L93 Difference]: Finished difference Result 40 states and 44 transitions. [2021-11-20 22:47:40,687 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-20 22:47:40,687 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 1.0) internal successors, (3), 3 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 [2021-11-20 22:47:40,687 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:47:40,688 INFO L225 Difference]: With dead ends: 40 [2021-11-20 22:47:40,688 INFO L226 Difference]: Without dead ends: 40 [2021-11-20 22:47:40,689 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-20 22:47:40,690 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 20 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 40 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 40 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 40 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 22:47:40,691 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [20 Valid, 28 Invalid, 40 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 40 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 22:47:40,692 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2021-11-20 22:47:40,695 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 23. [2021-11-20 22:47:40,695 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 14 states have (on average 1.8571428571428572) internal successors, (26), 22 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) [2021-11-20 22:47:40,696 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 26 transitions. [2021-11-20 22:47:40,696 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 26 transitions. Word has length 3 [2021-11-20 22:47:40,697 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:47:40,697 INFO L470 AbstractCegarLoop]: Abstraction has 23 states and 26 transitions. [2021-11-20 22:47:40,697 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 1.0) internal successors, (3), 3 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) [2021-11-20 22:47:40,697 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 26 transitions. [2021-11-20 22:47:40,697 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2021-11-20 22:47:40,698 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:47:40,698 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1] [2021-11-20 22:47:40,698 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-20 22:47:40,698 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-20 22:47:40,699 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:47:40,699 INFO L85 PathProgramCache]: Analyzing trace with hash 106111, now seen corresponding path program 1 times [2021-11-20 22:47:40,699 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:47:40,700 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1444899913] [2021-11-20 22:47:40,700 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:47:40,701 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:47:40,724 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:47:40,780 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:47:40,781 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:47:40,782 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1444899913] [2021-11-20 22:47:40,782 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1444899913] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 22:47:40,782 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 22:47:40,782 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-11-20 22:47:40,783 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1140107262] [2021-11-20 22:47:40,784 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 22:47:40,784 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 22:47:40,785 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:47:40,785 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 22:47:40,786 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 22:47:40,786 INFO L87 Difference]: Start difference. First operand 23 states and 26 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) [2021-11-20 22:47:40,833 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:47:40,833 INFO L93 Difference]: Finished difference Result 22 states and 25 transitions. [2021-11-20 22:47:40,834 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 22:47:40,835 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 [2021-11-20 22:47:40,835 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:47:40,836 INFO L225 Difference]: With dead ends: 22 [2021-11-20 22:47:40,836 INFO L226 Difference]: Without dead ends: 22 [2021-11-20 22:47:40,837 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 [2021-11-20 22:47:40,839 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 20 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 13 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 13 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 22:47:40,842 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [20 Valid, 9 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 22:47:40,844 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2021-11-20 22:47:40,848 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2021-11-20 22:47:40,851 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 21 states have internal predecessors, (25), 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) [2021-11-20 22:47:40,851 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 25 transitions. [2021-11-20 22:47:40,852 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 25 transitions. Word has length 3 [2021-11-20 22:47:40,852 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:47:40,852 INFO L470 AbstractCegarLoop]: Abstraction has 22 states and 25 transitions. [2021-11-20 22:47:40,852 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) [2021-11-20 22:47:40,853 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 25 transitions. [2021-11-20 22:47:40,853 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2021-11-20 22:47:40,853 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:47:40,853 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2021-11-20 22:47:40,854 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-20 22:47:40,854 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr4REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-20 22:47:40,855 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:47:40,856 INFO L85 PathProgramCache]: Analyzing trace with hash 3290841, now seen corresponding path program 1 times [2021-11-20 22:47:40,856 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:47:40,856 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [562715471] [2021-11-20 22:47:40,856 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:47:40,857 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:47:40,887 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:47:40,933 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:47:40,934 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:47:40,937 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [562715471] [2021-11-20 22:47:40,937 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [562715471] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 22:47:40,938 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 22:47:40,938 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-20 22:47:40,938 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1940132770] [2021-11-20 22:47:40,938 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 22:47:40,938 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 22:47:40,939 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:47:40,939 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 22:47:40,939 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 22:47:40,939 INFO L87 Difference]: Start difference. First operand 22 states and 25 transitions. Second operand has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 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) [2021-11-20 22:47:40,984 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:47:40,984 INFO L93 Difference]: Finished difference Result 19 states and 22 transitions. [2021-11-20 22:47:40,985 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 22:47:40,985 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 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 4 [2021-11-20 22:47:40,985 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:47:40,986 INFO L225 Difference]: With dead ends: 19 [2021-11-20 22:47:40,986 INFO L226 Difference]: Without dead ends: 19 [2021-11-20 22:47:40,986 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 22:47:40,988 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 10 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 17 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 20 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 17 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 22:47:40,990 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 9 Invalid, 20 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 17 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 22:47:40,991 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2021-11-20 22:47:40,995 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2021-11-20 22:47:40,995 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 14 states have (on average 1.5714285714285714) internal successors, (22), 18 states have internal predecessors, (22), 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) [2021-11-20 22:47:40,996 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 22 transitions. [2021-11-20 22:47:40,998 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 22 transitions. Word has length 4 [2021-11-20 22:47:40,998 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:47:40,998 INFO L470 AbstractCegarLoop]: Abstraction has 19 states and 22 transitions. [2021-11-20 22:47:40,998 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 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) [2021-11-20 22:47:40,998 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 22 transitions. [2021-11-20 22:47:40,999 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2021-11-20 22:47:40,999 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:47:40,999 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2021-11-20 22:47:40,999 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-20 22:47:41,000 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-20 22:47:41,000 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:47:41,003 INFO L85 PathProgramCache]: Analyzing trace with hash 3290842, now seen corresponding path program 1 times [2021-11-20 22:47:41,003 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:47:41,003 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1448703937] [2021-11-20 22:47:41,003 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:47:41,004 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:47:41,031 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:47:41,096 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:47:41,096 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:47:41,097 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1448703937] [2021-11-20 22:47:41,097 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1448703937] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 22:47:41,097 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 22:47:41,097 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-20 22:47:41,097 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1483739987] [2021-11-20 22:47:41,098 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 22:47:41,099 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-20 22:47:41,101 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:47:41,101 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-20 22:47:41,102 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-20 22:47:41,102 INFO L87 Difference]: Start difference. First operand 19 states and 22 transitions. Second operand has 4 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 3 states have internal predecessors, (4), 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) [2021-11-20 22:47:41,156 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:47:41,157 INFO L93 Difference]: Finished difference Result 28 states and 32 transitions. [2021-11-20 22:47:41,157 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-20 22:47:41,157 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 3 states have internal predecessors, (4), 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 4 [2021-11-20 22:47:41,158 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:47:41,158 INFO L225 Difference]: With dead ends: 28 [2021-11-20 22:47:41,158 INFO L226 Difference]: Without dead ends: 28 [2021-11-20 22:47:41,159 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-20 22:47:41,160 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 35 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 22 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 25 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 22 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 22:47:41,161 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [35 Valid, 15 Invalid, 25 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 22 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 22:47:41,162 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2021-11-20 22:47:41,164 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 24. [2021-11-20 22:47:41,164 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 19 states have (on average 1.5263157894736843) internal successors, (29), 23 states have internal predecessors, (29), 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) [2021-11-20 22:47:41,165 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 29 transitions. [2021-11-20 22:47:41,165 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 29 transitions. Word has length 4 [2021-11-20 22:47:41,165 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:47:41,165 INFO L470 AbstractCegarLoop]: Abstraction has 24 states and 29 transitions. [2021-11-20 22:47:41,165 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 3 states have internal predecessors, (4), 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) [2021-11-20 22:47:41,166 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 29 transitions. [2021-11-20 22:47:41,166 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2021-11-20 22:47:41,166 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:47:41,166 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1] [2021-11-20 22:47:41,166 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-20 22:47:41,167 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-20 22:47:41,167 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:47:41,167 INFO L85 PathProgramCache]: Analyzing trace with hash 100313571, now seen corresponding path program 1 times [2021-11-20 22:47:41,168 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:47:41,168 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [949043665] [2021-11-20 22:47:41,168 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:47:41,168 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:47:41,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:47:41,246 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:47:41,247 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:47:41,247 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [949043665] [2021-11-20 22:47:41,247 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [949043665] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 22:47:41,247 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [243298891] [2021-11-20 22:47:41,247 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:47:41,248 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:47:41,248 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 22:47:41,250 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 22:47:41,253 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-20 22:47:41,299 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:47:41,300 INFO L263 TraceCheckSpWp]: Trace formula consists of 41 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-20 22:47:41,305 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:47:41,380 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 [2021-11-20 22:47:41,468 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:47:41,469 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:47:41,655 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:47:41,655 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [243298891] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:47:41,656 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [710500554] [2021-11-20 22:47:41,673 INFO L159 IcfgInterpreter]: Started Sifa with 4 locations of interest [2021-11-20 22:47:41,674 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 22:47:41,678 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 22:47:41,683 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 22:47:41,683 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 22:47:41,763 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 [2021-11-20 22:47:41,861 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 23 treesize of output 19 [2021-11-20 22:47:42,048 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:47:42,050 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 144 treesize of output 136 [2021-11-20 22:47:42,420 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 23 treesize of output 19 [2021-11-20 22:47:42,644 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 23 treesize of output 19 [2021-11-20 22:47:42,708 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 22:47:42,988 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 22:47:42,989 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 22:47:42,989 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 7 [2021-11-20 22:47:42,989 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1117404727] [2021-11-20 22:47:42,989 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 22:47:42,989 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-20 22:47:42,990 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:47:42,990 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-20 22:47:42,990 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2021-11-20 22:47:42,991 INFO L87 Difference]: Start difference. First operand 24 states and 29 transitions. Second operand has 9 states, 8 states have (on average 1.625) internal successors, (13), 8 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) [2021-11-20 22:47:43,169 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:47:43,169 INFO L93 Difference]: Finished difference Result 60 states and 72 transitions. [2021-11-20 22:47:43,170 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-20 22:47:43,170 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 1.625) internal successors, (13), 8 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 [2021-11-20 22:47:43,170 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:47:43,172 INFO L225 Difference]: With dead ends: 60 [2021-11-20 22:47:43,172 INFO L226 Difference]: Without dead ends: 60 [2021-11-20 22:47:43,173 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 5 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=56, Invalid=154, Unknown=0, NotChecked=0, Total=210 [2021-11-20 22:47:43,174 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 92 mSDsluCounter, 49 mSDsCounter, 0 mSdLazyCounter, 107 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 92 SdHoareTripleChecker+Valid, 60 SdHoareTripleChecker+Invalid, 113 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 107 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 22:47:43,174 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [92 Valid, 60 Invalid, 113 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 107 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 22:47:43,175 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2021-11-20 22:47:43,178 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 21. [2021-11-20 22:47:43,178 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 17 states have (on average 1.4705882352941178) internal successors, (25), 20 states have internal predecessors, (25), 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) [2021-11-20 22:47:43,179 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2021-11-20 22:47:43,179 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 5 [2021-11-20 22:47:43,179 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:47:43,179 INFO L470 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2021-11-20 22:47:43,179 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 1.625) internal successors, (13), 8 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) [2021-11-20 22:47:43,180 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2021-11-20 22:47:43,180 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-20 22:47:43,180 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:47:43,180 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-20 22:47:43,204 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-20 22:47:43,403 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-11-20 22:47:43,404 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr10ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-20 22:47:43,404 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:47:43,404 INFO L85 PathProgramCache]: Analyzing trace with hash -746792756, now seen corresponding path program 1 times [2021-11-20 22:47:43,404 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:47:43,405 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [430093288] [2021-11-20 22:47:43,405 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:47:43,405 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:47:43,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:47:43,475 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:47:43,476 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:47:43,476 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [430093288] [2021-11-20 22:47:43,476 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [430093288] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 22:47:43,476 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 22:47:43,476 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-20 22:47:43,477 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [959881667] [2021-11-20 22:47:43,477 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 22:47:43,477 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-20 22:47:43,477 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:47:43,478 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-20 22:47:43,478 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-20 22:47:43,478 INFO L87 Difference]: Start difference. First operand 21 states and 25 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) [2021-11-20 22:47:43,497 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:47:43,498 INFO L93 Difference]: Finished difference Result 20 states and 24 transitions. [2021-11-20 22:47:43,498 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-20 22:47:43,498 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 7 [2021-11-20 22:47:43,498 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:47:43,500 INFO L225 Difference]: With dead ends: 20 [2021-11-20 22:47:43,500 INFO L226 Difference]: Without dead ends: 18 [2021-11-20 22:47:43,500 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-20 22:47:43,502 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 11 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 16 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 16 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 16 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 22:47:43,502 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [11 Valid, 18 Invalid, 16 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 16 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 22:47:43,504 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2021-11-20 22:47:43,507 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2021-11-20 22:47:43,507 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 15 states have (on average 1.4) internal successors, (21), 17 states have internal predecessors, (21), 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) [2021-11-20 22:47:43,508 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 21 transitions. [2021-11-20 22:47:43,508 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 21 transitions. Word has length 7 [2021-11-20 22:47:43,509 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:47:43,509 INFO L470 AbstractCegarLoop]: Abstraction has 18 states and 21 transitions. [2021-11-20 22:47:43,509 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) [2021-11-20 22:47:43,509 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 21 transitions. [2021-11-20 22:47:43,510 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-11-20 22:47:43,511 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:47:43,513 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 22:47:43,513 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-20 22:47:43,514 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-20 22:47:43,514 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:47:43,515 INFO L85 PathProgramCache]: Analyzing trace with hash -407205654, now seen corresponding path program 1 times [2021-11-20 22:47:43,515 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:47:43,515 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1585583499] [2021-11-20 22:47:43,516 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:47:43,516 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:47:43,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:47:43,611 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:47:43,612 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:47:43,612 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1585583499] [2021-11-20 22:47:43,612 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1585583499] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 22:47:43,612 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 22:47:43,613 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-20 22:47:43,613 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [278539246] [2021-11-20 22:47:43,613 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 22:47:43,613 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-20 22:47:43,613 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:47:43,614 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-20 22:47:43,614 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-20 22:47:43,614 INFO L87 Difference]: Start difference. First operand 18 states and 21 transitions. Second operand has 6 states, 6 states have (on average 1.5) internal successors, (9), 5 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) [2021-11-20 22:47:43,730 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:47:43,731 INFO L93 Difference]: Finished difference Result 23 states and 26 transitions. [2021-11-20 22:47:43,731 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-20 22:47:43,731 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.5) internal successors, (9), 5 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 9 [2021-11-20 22:47:43,731 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:47:43,732 INFO L225 Difference]: With dead ends: 23 [2021-11-20 22:47:43,732 INFO L226 Difference]: Without dead ends: 20 [2021-11-20 22:47:43,732 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2021-11-20 22:47:43,733 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 7 mSDsluCounter, 33 mSDsCounter, 0 mSdLazyCounter, 38 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 38 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 38 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 22:47:43,733 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7 Valid, 36 Invalid, 38 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 38 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 22:47:43,734 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2021-11-20 22:47:43,736 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 19. [2021-11-20 22:47:43,736 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 16 states have (on average 1.375) internal successors, (22), 18 states have internal predecessors, (22), 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) [2021-11-20 22:47:43,736 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 22 transitions. [2021-11-20 22:47:43,737 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 22 transitions. Word has length 9 [2021-11-20 22:47:43,737 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:47:43,737 INFO L470 AbstractCegarLoop]: Abstraction has 19 states and 22 transitions. [2021-11-20 22:47:43,737 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 1.5) internal successors, (9), 5 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) [2021-11-20 22:47:43,737 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 22 transitions. [2021-11-20 22:47:43,738 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-20 22:47:43,738 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:47:43,738 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 22:47:43,738 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-20 22:47:43,738 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-20 22:47:43,739 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:47:43,739 INFO L85 PathProgramCache]: Analyzing trace with hash 1521060926, now seen corresponding path program 1 times [2021-11-20 22:47:43,739 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:47:43,740 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1471841371] [2021-11-20 22:47:43,740 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:47:43,740 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:47:43,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:47:43,842 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:47:43,842 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:47:43,842 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1471841371] [2021-11-20 22:47:43,842 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1471841371] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 22:47:43,842 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [951365789] [2021-11-20 22:47:43,843 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:47:43,843 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:47:43,843 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 22:47:43,848 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 22:47:43,851 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-20 22:47:43,901 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:47:43,903 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-20 22:47:43,904 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:47:43,992 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:47:43,992 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:47:44,087 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2021-11-20 22:47:44,106 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:47:44,107 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [951365789] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:47:44,107 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1350851293] [2021-11-20 22:47:44,109 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 22:47:44,110 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 22:47:44,110 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 22:47:44,110 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 22:47:44,110 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 22:47:44,134 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 [2021-11-20 22:47:44,283 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 23 treesize of output 19 [2021-11-20 22:47:44,418 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:47:44,419 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 144 treesize of output 136 [2021-11-20 22:47:44,739 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 23 treesize of output 19 [2021-11-20 22:47:44,842 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 23 treesize of output 19 [2021-11-20 22:47:45,188 INFO L354 Elim1Store]: treesize reduction 28, result has 33.3 percent of original size [2021-11-20 22:47:45,189 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 139 treesize of output 135 [2021-11-20 22:47:49,187 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 22:47:49,716 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 22:47:49,716 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 22:47:49,716 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 12 [2021-11-20 22:47:49,717 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [928152651] [2021-11-20 22:47:49,717 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 22:47:49,717 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-20 22:47:49,717 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:47:49,717 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-20 22:47:49,718 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=350, Unknown=0, NotChecked=0, Total=420 [2021-11-20 22:47:49,718 INFO L87 Difference]: Start difference. First operand 19 states and 22 transitions. Second operand has 14 states, 13 states have (on average 2.1538461538461537) internal successors, (28), 13 states have internal predecessors, (28), 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) [2021-11-20 22:47:49,833 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:47:49,834 INFO L93 Difference]: Finished difference Result 25 states and 29 transitions. [2021-11-20 22:47:49,834 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-20 22:47:49,834 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 13 states have (on average 2.1538461538461537) internal successors, (28), 13 states have internal predecessors, (28), 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 11 [2021-11-20 22:47:49,834 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:47:49,835 INFO L225 Difference]: With dead ends: 25 [2021-11-20 22:47:49,835 INFO L226 Difference]: Without dead ends: 25 [2021-11-20 22:47:49,835 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 157 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=105, Invalid=495, Unknown=0, NotChecked=0, Total=600 [2021-11-20 22:47:49,836 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 75 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 59 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 75 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 76 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 59 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 22:47:49,836 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [75 Valid, 18 Invalid, 76 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 59 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 22:47:49,837 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2021-11-20 22:47:49,838 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 19. [2021-11-20 22:47:49,838 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 18 states have (on average 1.2222222222222223) internal successors, (22), 18 states have internal predecessors, (22), 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) [2021-11-20 22:47:49,848 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 22 transitions. [2021-11-20 22:47:49,848 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 22 transitions. Word has length 11 [2021-11-20 22:47:49,848 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:47:49,848 INFO L470 AbstractCegarLoop]: Abstraction has 19 states and 22 transitions. [2021-11-20 22:47:49,848 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 13 states have (on average 2.1538461538461537) internal successors, (28), 13 states have internal predecessors, (28), 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) [2021-11-20 22:47:49,848 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 22 transitions. [2021-11-20 22:47:49,849 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-11-20 22:47:49,849 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:47:49,849 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1] [2021-11-20 22:47:49,871 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-20 22:47:50,059 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2021-11-20 22:47:50,059 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-20 22:47:50,060 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:47:50,060 INFO L85 PathProgramCache]: Analyzing trace with hash 909439494, now seen corresponding path program 2 times [2021-11-20 22:47:50,060 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:47:50,060 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [902469771] [2021-11-20 22:47:50,060 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:47:50,060 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:47:50,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:47:50,237 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 5 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:47:50,237 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:47:50,237 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [902469771] [2021-11-20 22:47:50,237 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [902469771] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 22:47:50,237 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1480123666] [2021-11-20 22:47:50,238 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 22:47:50,238 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:47:50,239 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 22:47:50,240 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 22:47:50,267 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-20 22:47:50,307 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-20 22:47:50,307 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 22:47:50,308 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-20 22:47:50,310 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:47:50,462 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 27 treesize of output 23 [2021-11-20 22:47:50,679 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 5 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:47:50,679 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:47:50,788 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 20 [2021-11-20 22:47:50,792 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 28 [2021-11-20 22:47:50,982 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 5 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:47:50,982 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1480123666] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:47:50,982 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1919692769] [2021-11-20 22:47:50,986 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 22:47:50,986 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 22:47:50,986 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 22:47:50,987 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 22:47:50,988 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 22:47:51,042 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 [2021-11-20 22:47:51,127 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 [2021-11-20 22:47:51,274 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-20 22:47:51,274 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 138 treesize of output 137 [2021-11-20 22:47:51,674 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 23 treesize of output 19 [2021-11-20 22:47:51,799 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 23 treesize of output 19 [2021-11-20 22:47:52,110 INFO L354 Elim1Store]: treesize reduction 28, result has 33.3 percent of original size [2021-11-20 22:47:52,110 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 139 treesize of output 135 [2021-11-20 22:47:55,534 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 22:47:56,098 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 22:47:56,098 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 22:47:56,098 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9, 9] total 22 [2021-11-20 22:47:56,099 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [181132673] [2021-11-20 22:47:56,099 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 22:47:56,099 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-11-20 22:47:56,099 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:47:56,100 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-11-20 22:47:56,100 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=769, Unknown=0, NotChecked=0, Total=870 [2021-11-20 22:47:56,100 INFO L87 Difference]: Start difference. First operand 19 states and 22 transitions. Second operand has 23 states, 23 states have (on average 1.565217391304348) internal successors, (36), 22 states have internal predecessors, (36), 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) [2021-11-20 22:47:56,311 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:47:56,312 INFO L93 Difference]: Finished difference Result 31 states and 35 transitions. [2021-11-20 22:47:56,312 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-20 22:47:56,312 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.565217391304348) internal successors, (36), 22 states have internal predecessors, (36), 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 16 [2021-11-20 22:47:56,312 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:47:56,313 INFO L225 Difference]: With dead ends: 31 [2021-11-20 22:47:56,313 INFO L226 Difference]: Without dead ends: 22 [2021-11-20 22:47:56,313 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 25 SyntacticMatches, 2 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 327 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=162, Invalid=1028, Unknown=0, NotChecked=0, Total=1190 [2021-11-20 22:47:56,314 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 46 mSDsluCounter, 51 mSDsCounter, 0 mSdLazyCounter, 109 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 46 SdHoareTripleChecker+Valid, 47 SdHoareTripleChecker+Invalid, 124 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 109 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 22:47:56,314 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [46 Valid, 47 Invalid, 124 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 109 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 22:47:56,315 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2021-11-20 22:47:56,316 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2021-11-20 22:47:56,317 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 20 states have (on average 1.2) internal successors, (24), 20 states have internal predecessors, (24), 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) [2021-11-20 22:47:56,317 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 24 transitions. [2021-11-20 22:47:56,317 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 24 transitions. Word has length 16 [2021-11-20 22:47:56,317 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:47:56,317 INFO L470 AbstractCegarLoop]: Abstraction has 21 states and 24 transitions. [2021-11-20 22:47:56,318 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 1.565217391304348) internal successors, (36), 22 states have internal predecessors, (36), 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) [2021-11-20 22:47:56,318 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 24 transitions. [2021-11-20 22:47:56,318 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-11-20 22:47:56,318 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:47:56,318 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1] [2021-11-20 22:47:56,341 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-20 22:47:56,531 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:47:56,531 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-20 22:47:56,531 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:47:56,531 INFO L85 PathProgramCache]: Analyzing trace with hash 567232562, now seen corresponding path program 3 times [2021-11-20 22:47:56,531 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:47:56,531 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [98262416] [2021-11-20 22:47:56,532 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:47:56,532 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:47:56,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:47:56,641 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:47:56,641 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:47:56,642 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [98262416] [2021-11-20 22:47:56,642 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [98262416] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 22:47:56,644 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [720293670] [2021-11-20 22:47:56,644 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 22:47:56,644 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:47:56,644 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 22:47:56,649 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 22:47:56,650 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-20 22:47:56,691 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 22:47:56,691 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 22:47:56,697 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 27 conjunts are in the unsatisfiable core [2021-11-20 22:47:56,698 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:47:56,705 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 [2021-11-20 22:47:56,856 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 1 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:47:56,856 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:47:57,051 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 4 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:47:57,051 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [720293670] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:47:57,051 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [350305290] [2021-11-20 22:47:57,053 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 22:47:57,053 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 22:47:57,053 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 22:47:57,054 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 22:47:57,054 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 22:47:57,118 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 [2021-11-20 22:47:57,212 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 23 treesize of output 19 [2021-11-20 22:47:57,353 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:47:57,354 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 144 treesize of output 136 [2021-11-20 22:47:57,636 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 23 treesize of output 19 [2021-11-20 22:47:57,742 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 23 treesize of output 19 [2021-11-20 22:47:57,979 INFO L354 Elim1Store]: treesize reduction 28, result has 33.3 percent of original size [2021-11-20 22:47:57,979 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 139 treesize of output 135 [2021-11-20 22:48:01,346 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 22:48:01,919 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 22:48:01,919 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 22:48:01,920 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7, 7] total 19 [2021-11-20 22:48:01,920 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [14928072] [2021-11-20 22:48:01,920 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 22:48:01,920 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2021-11-20 22:48:01,920 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:48:01,921 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-11-20 22:48:01,921 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=661, Unknown=0, NotChecked=0, Total=756 [2021-11-20 22:48:01,922 INFO L87 Difference]: Start difference. First operand 21 states and 24 transitions. Second operand has 21 states, 20 states have (on average 2.55) internal successors, (51), 20 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) [2021-11-20 22:48:02,118 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:48:02,118 INFO L93 Difference]: Finished difference Result 32 states and 37 transitions. [2021-11-20 22:48:02,118 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-20 22:48:02,119 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 20 states have (on average 2.55) internal successors, (51), 20 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) Word has length 18 [2021-11-20 22:48:02,119 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:48:02,119 INFO L225 Difference]: With dead ends: 32 [2021-11-20 22:48:02,119 INFO L226 Difference]: Without dead ends: 32 [2021-11-20 22:48:02,120 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 31 SyntacticMatches, 1 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 217 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=166, Invalid=890, Unknown=0, NotChecked=0, Total=1056 [2021-11-20 22:48:02,121 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 184 mSDsluCounter, 33 mSDsCounter, 0 mSdLazyCounter, 122 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 184 SdHoareTripleChecker+Valid, 42 SdHoareTripleChecker+Invalid, 150 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 122 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 22:48:02,121 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [184 Valid, 42 Invalid, 150 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 122 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 22:48:02,122 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-11-20 22:48:02,124 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 27. [2021-11-20 22:48:02,126 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 26 states have (on average 1.1923076923076923) 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) [2021-11-20 22:48:02,127 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 31 transitions. [2021-11-20 22:48:02,128 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 31 transitions. Word has length 18 [2021-11-20 22:48:02,128 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:48:02,129 INFO L470 AbstractCegarLoop]: Abstraction has 27 states and 31 transitions. [2021-11-20 22:48:02,129 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 20 states have (on average 2.55) internal successors, (51), 20 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) [2021-11-20 22:48:02,129 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 31 transitions. [2021-11-20 22:48:02,130 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-11-20 22:48:02,130 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:48:02,130 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1] [2021-11-20 22:48:02,166 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-20 22:48:02,344 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:48:02,344 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-20 22:48:02,345 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:48:02,345 INFO L85 PathProgramCache]: Analyzing trace with hash -657813870, now seen corresponding path program 4 times [2021-11-20 22:48:02,345 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:48:02,345 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [112502124] [2021-11-20 22:48:02,345 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:48:02,345 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:48:02,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:48:02,474 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 9 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:48:02,474 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:48:02,474 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [112502124] [2021-11-20 22:48:02,474 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [112502124] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 22:48:02,475 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1023244937] [2021-11-20 22:48:02,475 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 22:48:02,475 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:48:02,475 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 22:48:02,476 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 22:48:02,502 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-20 22:48:02,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:48:02,538 INFO L263 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 33 conjunts are in the unsatisfiable core [2021-11-20 22:48:02,540 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:48:02,625 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 21 treesize of output 17 [2021-11-20 22:48:02,734 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2021-11-20 22:48:02,744 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 9 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:48:02,744 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:48:02,788 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-20 22:48:02,790 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 22 [2021-11-20 22:48:02,872 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 9 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:48:02,872 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1023244937] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:48:02,872 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [8447243] [2021-11-20 22:48:02,875 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 22:48:02,875 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 22:48:02,875 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 22:48:02,875 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 22:48:02,875 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 22:48:02,897 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 [2021-11-20 22:48:03,019 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 [2021-11-20 22:48:03,162 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-20 22:48:03,162 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 138 treesize of output 137 [2021-11-20 22:48:03,452 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 23 treesize of output 19 [2021-11-20 22:48:03,617 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 23 treesize of output 19 [2021-11-20 22:48:03,870 INFO L354 Elim1Store]: treesize reduction 28, result has 33.3 percent of original size [2021-11-20 22:48:03,871 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 139 treesize of output 135 [2021-11-20 22:48:06,961 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 22:48:07,509 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 22:48:07,509 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 22:48:07,509 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 19 [2021-11-20 22:48:07,509 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [84500153] [2021-11-20 22:48:07,509 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 22:48:07,510 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-20 22:48:07,510 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:48:07,510 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-20 22:48:07,511 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=624, Unknown=0, NotChecked=0, Total=702 [2021-11-20 22:48:07,511 INFO L87 Difference]: Start difference. First operand 27 states and 31 transitions. Second operand has 20 states, 20 states have (on average 2.2) internal successors, (44), 19 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) [2021-11-20 22:48:07,707 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:48:07,707 INFO L93 Difference]: Finished difference Result 45 states and 51 transitions. [2021-11-20 22:48:07,707 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-20 22:48:07,707 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.2) internal successors, (44), 19 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) Word has length 23 [2021-11-20 22:48:07,707 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:48:07,708 INFO L225 Difference]: With dead ends: 45 [2021-11-20 22:48:07,708 INFO L226 Difference]: Without dead ends: 30 [2021-11-20 22:48:07,709 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 49 SyntacticMatches, 3 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 205 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=145, Invalid=977, Unknown=0, NotChecked=0, Total=1122 [2021-11-20 22:48:07,709 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 45 mSDsluCounter, 83 mSDsCounter, 0 mSdLazyCounter, 171 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 45 SdHoareTripleChecker+Valid, 82 SdHoareTripleChecker+Invalid, 191 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 171 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 22:48:07,710 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [45 Valid, 82 Invalid, 191 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 171 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 22:48:07,710 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-11-20 22:48:07,712 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2021-11-20 22:48:07,712 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 28 states have (on average 1.1785714285714286) internal successors, (33), 28 states have internal predecessors, (33), 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) [2021-11-20 22:48:07,713 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 33 transitions. [2021-11-20 22:48:07,713 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 33 transitions. Word has length 23 [2021-11-20 22:48:07,713 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:48:07,713 INFO L470 AbstractCegarLoop]: Abstraction has 29 states and 33 transitions. [2021-11-20 22:48:07,714 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 2.2) internal successors, (44), 19 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) [2021-11-20 22:48:07,714 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 33 transitions. [2021-11-20 22:48:07,715 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-11-20 22:48:07,715 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:48:07,715 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1] [2021-11-20 22:48:07,734 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-20 22:48:07,916 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-11-20 22:48:07,916 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-20 22:48:07,917 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:48:07,917 INFO L85 PathProgramCache]: Analyzing trace with hash 196554470, now seen corresponding path program 5 times [2021-11-20 22:48:07,917 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:48:07,917 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [416682724] [2021-11-20 22:48:07,917 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:48:07,917 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:48:07,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:48:08,048 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 1 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:48:08,048 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:48:08,048 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [416682724] [2021-11-20 22:48:08,049 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [416682724] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 22:48:08,049 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1196848861] [2021-11-20 22:48:08,049 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 22:48:08,049 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:48:08,049 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 22:48:08,050 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 22:48:08,075 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-20 22:48:08,118 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-20 22:48:08,118 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 22:48:08,119 INFO L263 TraceCheckSpWp]: Trace formula consists of 144 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-20 22:48:08,121 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:48:08,272 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 4 proven. 23 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:48:08,272 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:48:08,445 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2021-11-20 22:48:08,473 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 4 proven. 23 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:48:08,473 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1196848861] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:48:08,473 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1171678205] [2021-11-20 22:48:08,475 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 22:48:08,475 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 22:48:08,475 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 22:48:08,475 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 22:48:08,475 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 22:48:08,492 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 [2021-11-20 22:48:08,593 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 23 treesize of output 19 [2021-11-20 22:48:08,705 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:48:08,706 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 144 treesize of output 136 [2021-11-20 22:48:08,979 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 23 treesize of output 19 [2021-11-20 22:48:09,063 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 23 treesize of output 19 [2021-11-20 22:48:09,354 INFO L354 Elim1Store]: treesize reduction 28, result has 33.3 percent of original size [2021-11-20 22:48:09,355 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 139 treesize of output 135 [2021-11-20 22:48:12,276 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 22:48:12,803 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 22:48:12,804 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 22:48:12,804 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9, 9] total 22 [2021-11-20 22:48:12,804 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1251760018] [2021-11-20 22:48:12,804 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 22:48:12,805 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-11-20 22:48:12,805 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:48:12,805 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-11-20 22:48:12,806 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=804, Unknown=0, NotChecked=0, Total=930 [2021-11-20 22:48:12,806 INFO L87 Difference]: Start difference. First operand 29 states and 33 transitions. Second operand has 24 states, 23 states have (on average 2.9130434782608696) internal successors, (67), 23 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) [2021-11-20 22:48:12,994 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:48:12,994 INFO L93 Difference]: Finished difference Result 40 states and 46 transitions. [2021-11-20 22:48:12,995 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-20 22:48:12,995 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 23 states have (on average 2.9130434782608696) internal successors, (67), 23 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) Word has length 25 [2021-11-20 22:48:12,995 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:48:12,996 INFO L225 Difference]: With dead ends: 40 [2021-11-20 22:48:12,996 INFO L226 Difference]: Without dead ends: 40 [2021-11-20 22:48:12,997 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 51 SyntacticMatches, 1 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 330 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=219, Invalid=1113, Unknown=0, NotChecked=0, Total=1332 [2021-11-20 22:48:12,997 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 217 mSDsluCounter, 33 mSDsCounter, 0 mSdLazyCounter, 126 mSolverCounterSat, 35 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 217 SdHoareTripleChecker+Valid, 45 SdHoareTripleChecker+Invalid, 161 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 126 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 22:48:12,998 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [217 Valid, 45 Invalid, 161 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [35 Valid, 126 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 22:48:12,998 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2021-11-20 22:48:13,000 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 35. [2021-11-20 22:48:13,001 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 34 states have (on average 1.1764705882352942) internal successors, (40), 34 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) [2021-11-20 22:48:13,001 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 40 transitions. [2021-11-20 22:48:13,001 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 40 transitions. Word has length 25 [2021-11-20 22:48:13,002 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:48:13,002 INFO L470 AbstractCegarLoop]: Abstraction has 35 states and 40 transitions. [2021-11-20 22:48:13,002 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 23 states have (on average 2.9130434782608696) internal successors, (67), 23 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) [2021-11-20 22:48:13,002 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 40 transitions. [2021-11-20 22:48:13,003 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-11-20 22:48:13,003 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:48:13,003 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 3, 3, 1, 1, 1, 1] [2021-11-20 22:48:13,040 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2021-11-20 22:48:13,216 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:48:13,216 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-20 22:48:13,217 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:48:13,217 INFO L85 PathProgramCache]: Analyzing trace with hash -1257588642, now seen corresponding path program 6 times [2021-11-20 22:48:13,217 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:48:13,217 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1240534676] [2021-11-20 22:48:13,217 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:48:13,217 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:48:13,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:48:13,396 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 13 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:48:13,396 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:48:13,396 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1240534676] [2021-11-20 22:48:13,397 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1240534676] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 22:48:13,397 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1160651439] [2021-11-20 22:48:13,397 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 22:48:13,397 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:48:13,397 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 22:48:13,404 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 22:48:13,424 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-20 22:48:13,467 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 22:48:13,467 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 22:48:13,468 INFO L263 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 39 conjunts are in the unsatisfiable core [2021-11-20 22:48:13,471 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:48:13,589 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 21 treesize of output 17 [2021-11-20 22:48:13,714 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2021-11-20 22:48:13,723 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 13 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:48:13,723 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:48:13,790 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-20 22:48:13,791 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 22 [2021-11-20 22:48:13,882 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 13 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:48:13,882 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1160651439] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:48:13,883 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [676292238] [2021-11-20 22:48:13,884 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 22:48:13,885 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 22:48:13,885 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 22:48:13,885 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 22:48:13,885 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 22:48:13,922 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 [2021-11-20 22:48:13,991 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 [2021-11-20 22:48:14,129 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-20 22:48:14,130 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 138 treesize of output 137 [2021-11-20 22:48:14,427 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 23 treesize of output 19 [2021-11-20 22:48:14,512 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 23 treesize of output 19 [2021-11-20 22:48:14,748 INFO L354 Elim1Store]: treesize reduction 28, result has 33.3 percent of original size [2021-11-20 22:48:14,748 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 139 treesize of output 135 [2021-11-20 22:48:17,821 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 22:48:18,408 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 22:48:18,408 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 22:48:18,408 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 22 [2021-11-20 22:48:18,408 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1417948341] [2021-11-20 22:48:18,408 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 22:48:18,409 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-11-20 22:48:18,409 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:48:18,409 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-11-20 22:48:18,409 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=785, Unknown=0, NotChecked=0, Total=870 [2021-11-20 22:48:18,410 INFO L87 Difference]: Start difference. First operand 35 states and 40 transitions. Second operand has 23 states, 23 states have (on average 2.3043478260869565) internal successors, (53), 22 states have internal predecessors, (53), 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) [2021-11-20 22:48:18,715 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:48:18,715 INFO L93 Difference]: Finished difference Result 80 states and 91 transitions. [2021-11-20 22:48:18,715 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-20 22:48:18,715 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 2.3043478260869565) internal successors, (53), 22 states have internal predecessors, (53), 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 [2021-11-20 22:48:18,716 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:48:18,716 INFO L225 Difference]: With dead ends: 80 [2021-11-20 22:48:18,716 INFO L226 Difference]: Without dead ends: 65 [2021-11-20 22:48:18,717 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 69 SyntacticMatches, 3 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 250 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=167, Invalid=1315, Unknown=0, NotChecked=0, Total=1482 [2021-11-20 22:48:18,718 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 67 mSDsluCounter, 120 mSDsCounter, 0 mSdLazyCounter, 262 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 67 SdHoareTripleChecker+Valid, 122 SdHoareTripleChecker+Invalid, 298 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 262 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 19 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 22:48:18,718 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [67 Valid, 122 Invalid, 298 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 262 Invalid, 0 Unknown, 19 Unchecked, 0.1s Time] [2021-11-20 22:48:18,719 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2021-11-20 22:48:18,721 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 42. [2021-11-20 22:48:18,722 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 41 states have (on average 1.170731707317073) internal successors, (48), 41 states have internal predecessors, (48), 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) [2021-11-20 22:48:18,722 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 48 transitions. [2021-11-20 22:48:18,723 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 48 transitions. Word has length 30 [2021-11-20 22:48:18,723 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:48:18,723 INFO L470 AbstractCegarLoop]: Abstraction has 42 states and 48 transitions. [2021-11-20 22:48:18,723 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 2.3043478260869565) internal successors, (53), 22 states have internal predecessors, (53), 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) [2021-11-20 22:48:18,724 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 48 transitions. [2021-11-20 22:48:18,724 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-11-20 22:48:18,725 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:48:18,725 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 3, 1, 1, 1, 1, 1, 1] [2021-11-20 22:48:18,744 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-20 22:48:18,928 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-11-20 22:48:18,928 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-20 22:48:18,929 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:48:18,929 INFO L85 PathProgramCache]: Analyzing trace with hash -577356413, now seen corresponding path program 1 times [2021-11-20 22:48:18,929 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:48:18,929 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [908712792] [2021-11-20 22:48:18,929 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:48:18,929 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:48:18,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:48:19,150 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 13 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:48:19,150 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:48:19,150 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [908712792] [2021-11-20 22:48:19,150 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [908712792] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 22:48:19,150 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [666582210] [2021-11-20 22:48:19,151 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:48:19,151 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:48:19,151 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 22:48:19,151 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 22:48:19,152 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-20 22:48:19,200 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:48:19,202 INFO L263 TraceCheckSpWp]: Trace formula consists of 170 conjuncts, 40 conjunts are in the unsatisfiable core [2021-11-20 22:48:19,204 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:48:19,308 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 21 treesize of output 17 [2021-11-20 22:48:19,380 INFO L354 Elim1Store]: treesize reduction 26, result has 27.8 percent of original size [2021-11-20 22:48:19,382 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 28 treesize of output 27 [2021-11-20 22:48:19,462 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2021-11-20 22:48:19,471 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 13 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:48:19,471 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:48:19,563 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-20 22:48:19,565 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 22 [2021-11-20 22:48:19,674 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 13 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:48:19,675 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [666582210] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:48:19,675 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1080298379] [2021-11-20 22:48:19,677 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-20 22:48:19,677 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 22:48:19,677 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 22:48:19,677 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 22:48:19,678 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 22:48:19,695 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 [2021-11-20 22:48:19,804 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 23 treesize of output 19 [2021-11-20 22:48:19,945 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:48:19,946 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 144 treesize of output 136 [2021-11-20 22:48:20,157 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 23 treesize of output 19 [2021-11-20 22:48:20,266 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 23 treesize of output 19 [2021-11-20 22:48:20,499 INFO L354 Elim1Store]: treesize reduction 28, result has 33.3 percent of original size [2021-11-20 22:48:20,499 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 139 treesize of output 135 [2021-11-20 22:48:23,081 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 11 treesize of output 7 [2021-11-20 22:48:25,382 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 11 treesize of output 7 [2021-11-20 22:48:27,073 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 11 treesize of output 7 [2021-11-20 22:48:29,464 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 11 treesize of output 7 [2021-11-20 22:48:32,376 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 22:48:33,528 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 22:48:33,528 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 22:48:33,528 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 22 [2021-11-20 22:48:33,528 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1889163260] [2021-11-20 22:48:33,529 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 22:48:33,529 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-11-20 22:48:33,529 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:48:33,529 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-11-20 22:48:33,530 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=94, Invalid=898, Unknown=0, NotChecked=0, Total=992 [2021-11-20 22:48:33,530 INFO L87 Difference]: Start difference. First operand 42 states and 48 transitions. Second operand has 23 states, 23 states have (on average 2.4347826086956523) internal successors, (56), 22 states have internal predecessors, (56), 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) [2021-11-20 22:48:33,876 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:48:33,876 INFO L93 Difference]: Finished difference Result 59 states and 66 transitions. [2021-11-20 22:48:33,876 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-20 22:48:33,877 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 2.4347826086956523) internal successors, (56), 22 states have internal predecessors, (56), 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 31 [2021-11-20 22:48:33,877 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:48:33,877 INFO L225 Difference]: With dead ends: 59 [2021-11-20 22:48:33,877 INFO L226 Difference]: Without dead ends: 38 [2021-11-20 22:48:33,878 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 69 SyntacticMatches, 5 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 308 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=176, Invalid=1464, Unknown=0, NotChecked=0, Total=1640 [2021-11-20 22:48:33,879 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 54 mSDsluCounter, 130 mSDsCounter, 0 mSdLazyCounter, 270 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 54 SdHoareTripleChecker+Valid, 131 SdHoareTripleChecker+Invalid, 321 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 270 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 26 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 22:48:33,879 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [54 Valid, 131 Invalid, 321 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 270 Invalid, 0 Unknown, 26 Unchecked, 0.2s Time] [2021-11-20 22:48:33,879 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2021-11-20 22:48:33,881 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2021-11-20 22:48:33,882 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 36 states have (on average 1.1666666666666667) internal successors, (42), 36 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) [2021-11-20 22:48:33,882 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 42 transitions. [2021-11-20 22:48:33,882 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 42 transitions. Word has length 31 [2021-11-20 22:48:33,882 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:48:33,883 INFO L470 AbstractCegarLoop]: Abstraction has 37 states and 42 transitions. [2021-11-20 22:48:33,883 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 2.4347826086956523) internal successors, (56), 22 states have internal predecessors, (56), 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) [2021-11-20 22:48:33,883 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 42 transitions. [2021-11-20 22:48:33,884 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-11-20 22:48:33,884 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:48:33,885 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1] [2021-11-20 22:48:33,921 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-20 22:48:34,104 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-11-20 22:48:34,104 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-20 22:48:34,105 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:48:34,105 INFO L85 PathProgramCache]: Analyzing trace with hash 1921831306, now seen corresponding path program 7 times [2021-11-20 22:48:34,105 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:48:34,105 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [259451477] [2021-11-20 22:48:34,105 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:48:34,105 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:48:34,118 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:48:34,313 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 4 proven. 46 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:48:34,313 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:48:34,313 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [259451477] [2021-11-20 22:48:34,313 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [259451477] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 22:48:34,314 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1604559626] [2021-11-20 22:48:34,314 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 22:48:34,314 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:48:34,314 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 22:48:34,315 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 22:48:34,338 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-20 22:48:34,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:48:34,382 INFO L263 TraceCheckSpWp]: Trace formula consists of 172 conjuncts, 35 conjunts are in the unsatisfiable core [2021-11-20 22:48:34,384 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:48:34,565 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 9 proven. 41 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:48:34,565 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:48:34,741 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2021-11-20 22:48:34,769 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 9 proven. 41 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:48:34,769 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1604559626] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:48:34,769 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1074580686] [2021-11-20 22:48:34,771 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 22:48:34,771 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 22:48:34,771 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 22:48:34,772 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 22:48:34,772 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 22:48:34,833 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 [2021-11-20 22:48:34,912 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 23 treesize of output 19 [2021-11-20 22:48:35,017 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:48:35,017 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 144 treesize of output 136 [2021-11-20 22:48:35,253 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 23 treesize of output 19 [2021-11-20 22:48:35,333 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 23 treesize of output 19 [2021-11-20 22:48:35,564 INFO L354 Elim1Store]: treesize reduction 28, result has 33.3 percent of original size [2021-11-20 22:48:35,564 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 139 treesize of output 135 [2021-11-20 22:48:38,515 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 22:48:39,072 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 22:48:39,072 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 22:48:39,072 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 11, 11] total 23 [2021-11-20 22:48:39,072 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [512089323] [2021-11-20 22:48:39,072 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 22:48:39,073 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-11-20 22:48:39,073 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:48:39,073 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-11-20 22:48:39,073 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=121, Invalid=871, Unknown=0, NotChecked=0, Total=992 [2021-11-20 22:48:39,073 INFO L87 Difference]: Start difference. First operand 37 states and 42 transitions. Second operand has 25 states, 24 states have (on average 2.9166666666666665) internal successors, (70), 24 states have internal predecessors, (70), 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) [2021-11-20 22:48:39,404 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:48:39,404 INFO L93 Difference]: Finished difference Result 48 states and 55 transitions. [2021-11-20 22:48:39,405 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-20 22:48:39,405 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 24 states have (on average 2.9166666666666665) internal successors, (70), 24 states have internal predecessors, (70), 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 32 [2021-11-20 22:48:39,405 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:48:39,405 INFO L225 Difference]: With dead ends: 48 [2021-11-20 22:48:39,405 INFO L226 Difference]: Without dead ends: 48 [2021-11-20 22:48:39,406 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 72 SyntacticMatches, 2 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 355 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=233, Invalid=1249, Unknown=0, NotChecked=0, Total=1482 [2021-11-20 22:48:39,406 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 243 mSDsluCounter, 108 mSDsCounter, 0 mSdLazyCounter, 327 mSolverCounterSat, 36 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 243 SdHoareTripleChecker+Valid, 123 SdHoareTripleChecker+Invalid, 363 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 36 IncrementalHoareTripleChecker+Valid, 327 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 22:48:39,407 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [243 Valid, 123 Invalid, 363 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [36 Valid, 327 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 22:48:39,407 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2021-11-20 22:48:39,409 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 43. [2021-11-20 22:48:39,410 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 42 states have (on average 1.1666666666666667) internal successors, (49), 42 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) [2021-11-20 22:48:39,410 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 49 transitions. [2021-11-20 22:48:39,410 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 49 transitions. Word has length 32 [2021-11-20 22:48:39,411 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:48:39,411 INFO L470 AbstractCegarLoop]: Abstraction has 43 states and 49 transitions. [2021-11-20 22:48:39,411 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 24 states have (on average 2.9166666666666665) internal successors, (70), 24 states have internal predecessors, (70), 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) [2021-11-20 22:48:39,411 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 49 transitions. [2021-11-20 22:48:39,412 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-11-20 22:48:39,412 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:48:39,413 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 4, 4, 1, 1, 1, 1] [2021-11-20 22:48:39,438 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-20 22:48:39,624 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-11-20 22:48:39,625 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-20 22:48:39,625 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:48:39,625 INFO L85 PathProgramCache]: Analyzing trace with hash -733668294, now seen corresponding path program 8 times [2021-11-20 22:48:39,625 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:48:39,625 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1735626045] [2021-11-20 22:48:39,626 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:48:39,626 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:48:39,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:48:39,838 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 17 proven. 54 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:48:39,838 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:48:39,838 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1735626045] [2021-11-20 22:48:39,838 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1735626045] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 22:48:39,838 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2078138206] [2021-11-20 22:48:39,838 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 22:48:39,839 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:48:39,839 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 22:48:39,839 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 22:48:39,840 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-20 22:48:39,913 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-11-20 22:48:39,914 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 22:48:39,915 INFO L263 TraceCheckSpWp]: Trace formula consists of 190 conjuncts, 45 conjunts are in the unsatisfiable core [2021-11-20 22:48:39,917 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:48:40,035 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 21 treesize of output 17 [2021-11-20 22:48:40,171 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2021-11-20 22:48:40,180 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 17 proven. 54 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:48:40,180 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:48:40,263 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-20 22:48:40,269 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 22 [2021-11-20 22:48:40,395 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 17 proven. 54 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:48:40,395 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2078138206] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:48:40,395 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1769601239] [2021-11-20 22:48:40,397 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 22:48:40,397 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 22:48:40,397 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 22:48:40,397 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 22:48:40,397 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 22:48:40,412 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 [2021-11-20 22:48:40,554 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 [2021-11-20 22:48:40,688 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-20 22:48:40,688 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 138 treesize of output 137 [2021-11-20 22:48:40,985 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 23 treesize of output 19 [2021-11-20 22:48:41,068 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 23 treesize of output 19 [2021-11-20 22:48:41,342 INFO L354 Elim1Store]: treesize reduction 28, result has 33.3 percent of original size [2021-11-20 22:48:41,342 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 139 treesize of output 135 [2021-11-20 22:48:44,229 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 22:48:44,815 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 22:48:44,816 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 22:48:44,816 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 25 [2021-11-20 22:48:44,816 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [500779751] [2021-11-20 22:48:44,816 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 22:48:44,816 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-20 22:48:44,816 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:48:44,817 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-20 22:48:44,817 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=964, Unknown=0, NotChecked=0, Total=1056 [2021-11-20 22:48:44,818 INFO L87 Difference]: Start difference. First operand 43 states and 49 transitions. Second operand has 26 states, 26 states have (on average 2.3846153846153846) internal successors, (62), 25 states have internal predecessors, (62), 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) [2021-11-20 22:48:45,244 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:48:45,244 INFO L93 Difference]: Finished difference Result 73 states and 83 transitions. [2021-11-20 22:48:45,244 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-20 22:48:45,244 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 2.3846153846153846) internal successors, (62), 25 states have internal predecessors, (62), 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 37 [2021-11-20 22:48:45,245 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:48:45,245 INFO L225 Difference]: With dead ends: 73 [2021-11-20 22:48:45,245 INFO L226 Difference]: Without dead ends: 46 [2021-11-20 22:48:45,246 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 89 SyntacticMatches, 3 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 300 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=189, Invalid=1703, Unknown=0, NotChecked=0, Total=1892 [2021-11-20 22:48:45,247 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 75 mSDsluCounter, 189 mSDsCounter, 0 mSdLazyCounter, 405 mSolverCounterSat, 34 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 75 SdHoareTripleChecker+Valid, 191 SdHoareTripleChecker+Invalid, 462 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 34 IncrementalHoareTripleChecker+Valid, 405 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 23 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 22:48:45,247 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [75 Valid, 191 Invalid, 462 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [34 Valid, 405 Invalid, 0 Unknown, 23 Unchecked, 0.2s Time] [2021-11-20 22:48:45,248 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2021-11-20 22:48:45,249 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 45. [2021-11-20 22:48:45,250 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 44 states have (on average 1.1590909090909092) 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) [2021-11-20 22:48:45,250 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 51 transitions. [2021-11-20 22:48:45,251 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 51 transitions. Word has length 37 [2021-11-20 22:48:45,251 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:48:45,251 INFO L470 AbstractCegarLoop]: Abstraction has 45 states and 51 transitions. [2021-11-20 22:48:45,251 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 2.3846153846153846) internal successors, (62), 25 states have internal predecessors, (62), 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) [2021-11-20 22:48:45,251 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 51 transitions. [2021-11-20 22:48:45,252 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-11-20 22:48:45,253 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:48:45,253 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1] [2021-11-20 22:48:45,272 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-20 22:48:45,456 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-11-20 22:48:45,456 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-20 22:48:45,457 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:48:45,457 INFO L85 PathProgramCache]: Analyzing trace with hash 412653966, now seen corresponding path program 9 times [2021-11-20 22:48:45,457 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:48:45,457 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [701174691] [2021-11-20 22:48:45,457 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:48:45,457 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:48:45,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:48:45,650 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 9 proven. 71 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:48:45,650 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:48:45,651 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [701174691] [2021-11-20 22:48:45,651 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [701174691] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 22:48:45,651 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1410481817] [2021-11-20 22:48:45,651 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 22:48:45,651 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:48:45,652 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 22:48:45,663 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 22:48:45,668 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-20 22:48:45,730 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 22:48:45,730 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 22:48:45,731 INFO L263 TraceCheckSpWp]: Trace formula consists of 200 conjuncts, 42 conjunts are in the unsatisfiable core [2021-11-20 22:48:45,733 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:48:45,745 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 [2021-11-20 22:48:46,099 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 16 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:48:46,099 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:48:46,536 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 25 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:48:46,536 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1410481817] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:48:46,537 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [285616179] [2021-11-20 22:48:46,538 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 22:48:46,538 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 22:48:46,539 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 22:48:46,539 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 22:48:46,539 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 22:48:46,593 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 [2021-11-20 22:48:46,665 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 23 treesize of output 19 [2021-11-20 22:48:46,772 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:48:46,773 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 144 treesize of output 136 [2021-11-20 22:48:46,976 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 23 treesize of output 19 [2021-11-20 22:48:47,066 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 23 treesize of output 19 [2021-11-20 22:48:47,305 INFO L354 Elim1Store]: treesize reduction 28, result has 33.3 percent of original size [2021-11-20 22:48:47,305 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 139 treesize of output 135 [2021-11-20 22:48:50,289 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 22:48:50,974 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 22:48:50,974 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 22:48:50,974 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13, 13] total 37 [2021-11-20 22:48:50,975 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2070573466] [2021-11-20 22:48:50,975 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 22:48:50,975 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2021-11-20 22:48:50,975 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:48:50,976 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-11-20 22:48:50,977 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=233, Invalid=1837, Unknown=0, NotChecked=0, Total=2070 [2021-11-20 22:48:50,977 INFO L87 Difference]: Start difference. First operand 45 states and 51 transitions. Second operand has 39 states, 38 states have (on average 3.0) internal successors, (114), 38 states have internal predecessors, (114), 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) [2021-11-20 22:48:51,401 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:48:51,401 INFO L93 Difference]: Finished difference Result 56 states and 64 transitions. [2021-11-20 22:48:51,402 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-20 22:48:51,402 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 38 states have (on average 3.0) internal successors, (114), 38 states have internal predecessors, (114), 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 39 [2021-11-20 22:48:51,402 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:48:51,403 INFO L225 Difference]: With dead ends: 56 [2021-11-20 22:48:51,403 INFO L226 Difference]: Without dead ends: 56 [2021-11-20 22:48:51,404 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 82 SyntacticMatches, 1 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 799 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=433, Invalid=2429, Unknown=0, NotChecked=0, Total=2862 [2021-11-20 22:48:51,404 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 137 mSDsluCounter, 231 mSDsCounter, 0 mSdLazyCounter, 629 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 137 SdHoareTripleChecker+Valid, 249 SdHoareTripleChecker+Invalid, 655 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 629 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-20 22:48:51,405 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [137 Valid, 249 Invalid, 655 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 629 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-20 22:48:51,405 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2021-11-20 22:48:51,407 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 51. [2021-11-20 22:48:51,408 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 50 states have (on average 1.16) internal successors, (58), 50 states have internal predecessors, (58), 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) [2021-11-20 22:48:51,408 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 58 transitions. [2021-11-20 22:48:51,409 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 58 transitions. Word has length 39 [2021-11-20 22:48:51,409 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:48:51,409 INFO L470 AbstractCegarLoop]: Abstraction has 51 states and 58 transitions. [2021-11-20 22:48:51,409 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 38 states have (on average 3.0) internal successors, (114), 38 states have internal predecessors, (114), 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) [2021-11-20 22:48:51,409 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 58 transitions. [2021-11-20 22:48:51,413 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-11-20 22:48:51,413 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:48:51,414 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 5, 5, 1, 1, 1, 1] [2021-11-20 22:48:51,435 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-20 22:48:51,620 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-11-20 22:48:51,620 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-20 22:48:51,621 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:48:51,621 INFO L85 PathProgramCache]: Analyzing trace with hash -1926646090, now seen corresponding path program 10 times [2021-11-20 22:48:51,621 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:48:51,621 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1291651741] [2021-11-20 22:48:51,621 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:48:51,621 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:48:51,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:48:51,886 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 21 proven. 85 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:48:51,886 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:48:51,886 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1291651741] [2021-11-20 22:48:51,886 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1291651741] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 22:48:51,887 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [744235760] [2021-11-20 22:48:51,887 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 22:48:51,887 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:48:51,887 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 22:48:51,892 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 22:48:51,893 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-20 22:48:51,946 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:48:51,947 INFO L263 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 51 conjunts are in the unsatisfiable core [2021-11-20 22:48:51,949 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:48:52,100 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 21 treesize of output 17 [2021-11-20 22:48:52,224 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2021-11-20 22:48:52,241 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 21 proven. 85 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:48:52,241 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:48:52,320 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-20 22:48:52,322 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 22 [2021-11-20 22:48:52,434 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 21 proven. 85 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:48:52,434 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [744235760] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:48:52,435 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1097298411] [2021-11-20 22:48:52,436 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 22:48:52,436 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 22:48:52,437 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 22:48:52,437 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 22:48:52,437 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 22:48:52,458 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 [2021-11-20 22:48:52,553 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 23 treesize of output 19 [2021-11-20 22:48:52,677 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:48:52,678 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 144 treesize of output 136 [2021-11-20 22:48:52,912 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 23 treesize of output 19 [2021-11-20 22:48:52,996 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 23 treesize of output 19 [2021-11-20 22:48:53,268 INFO L354 Elim1Store]: treesize reduction 28, result has 33.3 percent of original size [2021-11-20 22:48:53,269 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 139 treesize of output 135 [2021-11-20 22:48:56,115 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 22:48:56,739 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 22:48:56,739 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 22:48:56,739 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 28 [2021-11-20 22:48:56,739 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [979336821] [2021-11-20 22:48:56,739 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 22:48:56,739 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2021-11-20 22:48:56,740 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:48:56,740 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-11-20 22:48:56,741 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=1161, Unknown=0, NotChecked=0, Total=1260 [2021-11-20 22:48:56,741 INFO L87 Difference]: Start difference. First operand 51 states and 58 transitions. Second operand has 29 states, 29 states have (on average 2.4482758620689653) internal successors, (71), 28 states have internal predecessors, (71), 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) [2021-11-20 22:48:57,249 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:48:57,249 INFO L93 Difference]: Finished difference Result 87 states and 99 transitions. [2021-11-20 22:48:57,249 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-20 22:48:57,249 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 2.4482758620689653) internal successors, (71), 28 states have internal predecessors, (71), 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 44 [2021-11-20 22:48:57,250 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:48:57,250 INFO L225 Difference]: With dead ends: 87 [2021-11-20 22:48:57,250 INFO L226 Difference]: Without dead ends: 54 [2021-11-20 22:48:57,251 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 159 GetRequests, 109 SyntacticMatches, 3 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 355 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=211, Invalid=2141, Unknown=0, NotChecked=0, Total=2352 [2021-11-20 22:48:57,252 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 120 mSDsluCounter, 247 mSDsCounter, 0 mSdLazyCounter, 568 mSolverCounterSat, 53 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 120 SdHoareTripleChecker+Valid, 252 SdHoareTripleChecker+Invalid, 621 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 53 IncrementalHoareTripleChecker+Valid, 568 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 22:48:57,252 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [120 Valid, 252 Invalid, 621 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [53 Valid, 568 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 22:48:57,253 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2021-11-20 22:48:57,255 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2021-11-20 22:48:57,255 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 52 states have (on average 1.1538461538461537) internal successors, (60), 52 states have internal predecessors, (60), 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) [2021-11-20 22:48:57,256 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 60 transitions. [2021-11-20 22:48:57,256 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 60 transitions. Word has length 44 [2021-11-20 22:48:57,256 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:48:57,256 INFO L470 AbstractCegarLoop]: Abstraction has 53 states and 60 transitions. [2021-11-20 22:48:57,256 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 2.4482758620689653) internal successors, (71), 28 states have internal predecessors, (71), 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) [2021-11-20 22:48:57,257 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 60 transitions. [2021-11-20 22:48:57,258 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-11-20 22:48:57,258 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:48:57,258 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1] [2021-11-20 22:48:57,282 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-20 22:48:57,464 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:48:57,464 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-20 22:48:57,464 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:48:57,465 INFO L85 PathProgramCache]: Analyzing trace with hash 1581404898, now seen corresponding path program 11 times [2021-11-20 22:48:57,465 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:48:57,465 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [64356582] [2021-11-20 22:48:57,465 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:48:57,465 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:48:57,482 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:48:57,698 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 16 proven. 101 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:48:57,698 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:48:57,698 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [64356582] [2021-11-20 22:48:57,698 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [64356582] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 22:48:57,698 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1676589372] [2021-11-20 22:48:57,698 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 22:48:57,698 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:48:57,698 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 22:48:57,699 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 22:48:57,700 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-20 22:48:57,775 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2021-11-20 22:48:57,775 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 22:48:57,777 INFO L263 TraceCheckSpWp]: Trace formula consists of 228 conjuncts, 40 conjunts are in the unsatisfiable core [2021-11-20 22:48:57,779 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:48:58,070 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 25 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:48:58,070 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:48:58,373 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2021-11-20 22:48:58,409 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 25 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:48:58,409 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1676589372] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:48:58,410 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [940108086] [2021-11-20 22:48:58,411 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 22:48:58,411 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 22:48:58,411 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 22:48:58,412 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 22:48:58,412 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 22:48:58,443 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 [2021-11-20 22:48:58,525 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 [2021-11-20 22:48:58,627 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-20 22:48:58,627 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 138 treesize of output 137 [2021-11-20 22:48:58,895 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 23 treesize of output 19 [2021-11-20 22:48:59,016 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 23 treesize of output 19 [2021-11-20 22:48:59,319 INFO L354 Elim1Store]: treesize reduction 28, result has 33.3 percent of original size [2021-11-20 22:48:59,320 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 139 treesize of output 135 [2021-11-20 22:49:02,337 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 22:49:02,943 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 22:49:02,943 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 22:49:02,943 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 15, 15] total 37 [2021-11-20 22:49:02,944 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [760136567] [2021-11-20 22:49:02,944 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 22:49:02,945 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2021-11-20 22:49:02,945 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:49:02,945 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-11-20 22:49:02,946 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=273, Invalid=1797, Unknown=0, NotChecked=0, Total=2070 [2021-11-20 22:49:02,946 INFO L87 Difference]: Start difference. First operand 53 states and 60 transitions. Second operand has 39 states, 38 states have (on average 3.263157894736842) internal successors, (124), 38 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) [2021-11-20 22:49:03,367 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:49:03,367 INFO L93 Difference]: Finished difference Result 64 states and 73 transitions. [2021-11-20 22:49:03,368 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-20 22:49:03,368 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 38 states have (on average 3.263157894736842) internal successors, (124), 38 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 46 [2021-11-20 22:49:03,368 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:49:03,369 INFO L225 Difference]: With dead ends: 64 [2021-11-20 22:49:03,369 INFO L226 Difference]: Without dead ends: 64 [2021-11-20 22:49:03,370 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 159 GetRequests, 105 SyntacticMatches, 1 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 837 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=498, Invalid=2472, Unknown=0, NotChecked=0, Total=2970 [2021-11-20 22:49:03,371 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 225 mSDsluCounter, 117 mSDsCounter, 0 mSdLazyCounter, 385 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 225 SdHoareTripleChecker+Valid, 138 SdHoareTripleChecker+Invalid, 415 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 385 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 22:49:03,371 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [225 Valid, 138 Invalid, 415 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 385 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 22:49:03,371 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2021-11-20 22:49:03,374 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 59. [2021-11-20 22:49:03,375 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 58 states have (on average 1.1551724137931034) internal successors, (67), 58 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) [2021-11-20 22:49:03,375 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 67 transitions. [2021-11-20 22:49:03,375 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 67 transitions. Word has length 46 [2021-11-20 22:49:03,376 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:49:03,376 INFO L470 AbstractCegarLoop]: Abstraction has 59 states and 67 transitions. [2021-11-20 22:49:03,376 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 38 states have (on average 3.263157894736842) internal successors, (124), 38 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) [2021-11-20 22:49:03,383 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 67 transitions. [2021-11-20 22:49:03,384 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-11-20 22:49:03,390 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:49:03,391 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 7, 6, 6, 1, 1, 1, 1] [2021-11-20 22:49:03,427 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-20 22:49:03,605 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:49:03,605 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-20 22:49:03,606 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:49:03,606 INFO L85 PathProgramCache]: Analyzing trace with hash -1459441182, now seen corresponding path program 12 times [2021-11-20 22:49:03,606 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:49:03,606 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [141224395] [2021-11-20 22:49:03,606 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:49:03,606 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:49:03,632 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:49:03,960 INFO L134 CoverageAnalysis]: Checked inductivity of 148 backedges. 25 proven. 123 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:49:03,960 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:49:03,960 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [141224395] [2021-11-20 22:49:03,960 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [141224395] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 22:49:03,960 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1991068462] [2021-11-20 22:49:03,960 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 22:49:03,960 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:49:03,961 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 22:49:03,968 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 22:49:03,985 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-20 22:49:04,047 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 22:49:04,047 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 22:49:04,049 INFO L263 TraceCheckSpWp]: Trace formula consists of 246 conjuncts, 57 conjunts are in the unsatisfiable core [2021-11-20 22:49:04,051 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:49:04,269 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 21 treesize of output 17 [2021-11-20 22:49:04,425 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2021-11-20 22:49:04,432 INFO L134 CoverageAnalysis]: Checked inductivity of 148 backedges. 25 proven. 123 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:49:04,432 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:49:04,522 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-20 22:49:04,524 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 22 [2021-11-20 22:49:04,647 INFO L134 CoverageAnalysis]: Checked inductivity of 148 backedges. 25 proven. 123 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:49:04,647 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1991068462] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:49:04,647 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1744314192] [2021-11-20 22:49:04,648 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 22:49:04,648 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 22:49:04,648 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 22:49:04,649 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 22:49:04,649 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 22:49:04,700 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 [2021-11-20 22:49:04,760 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 23 treesize of output 19 [2021-11-20 22:49:04,876 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:49:04,877 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 144 treesize of output 136 [2021-11-20 22:49:05,105 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 23 treesize of output 19 [2021-11-20 22:49:05,288 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 23 treesize of output 19 [2021-11-20 22:49:05,544 INFO L354 Elim1Store]: treesize reduction 28, result has 33.3 percent of original size [2021-11-20 22:49:05,544 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 139 treesize of output 135 [2021-11-20 22:49:08,520 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 22:49:09,181 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 22:49:09,181 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 22:49:09,182 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 31 [2021-11-20 22:49:09,182 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1525564178] [2021-11-20 22:49:09,182 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 22:49:09,182 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-20 22:49:09,182 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:49:09,182 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-20 22:49:09,183 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=106, Invalid=1376, Unknown=0, NotChecked=0, Total=1482 [2021-11-20 22:49:09,183 INFO L87 Difference]: Start difference. First operand 59 states and 67 transitions. Second operand has 32 states, 32 states have (on average 2.5) internal successors, (80), 31 states have internal predecessors, (80), 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) [2021-11-20 22:49:09,889 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:49:09,889 INFO L93 Difference]: Finished difference Result 101 states and 115 transitions. [2021-11-20 22:49:09,890 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-20 22:49:09,890 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 2.5) internal successors, (80), 31 states have internal predecessors, (80), 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 51 [2021-11-20 22:49:09,890 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:49:09,891 INFO L225 Difference]: With dead ends: 101 [2021-11-20 22:49:09,891 INFO L226 Difference]: Without dead ends: 62 [2021-11-20 22:49:09,892 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 184 GetRequests, 129 SyntacticMatches, 3 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 415 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=233, Invalid=2629, Unknown=0, NotChecked=0, Total=2862 [2021-11-20 22:49:09,893 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 140 mSDsluCounter, 372 mSDsCounter, 0 mSdLazyCounter, 839 mSolverCounterSat, 63 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 140 SdHoareTripleChecker+Valid, 378 SdHoareTripleChecker+Invalid, 902 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 63 IncrementalHoareTripleChecker+Valid, 839 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-20 22:49:09,893 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [140 Valid, 378 Invalid, 902 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [63 Valid, 839 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-20 22:49:09,894 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2021-11-20 22:49:09,895 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 61. [2021-11-20 22:49:09,896 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 60 states have (on average 1.15) internal successors, (69), 60 states have internal predecessors, (69), 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) [2021-11-20 22:49:09,896 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 69 transitions. [2021-11-20 22:49:09,897 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 69 transitions. Word has length 51 [2021-11-20 22:49:09,897 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:49:09,897 INFO L470 AbstractCegarLoop]: Abstraction has 61 states and 69 transitions. [2021-11-20 22:49:09,897 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 2.5) internal successors, (80), 31 states have internal predecessors, (80), 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) [2021-11-20 22:49:09,897 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 69 transitions. [2021-11-20 22:49:09,898 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-11-20 22:49:09,898 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:49:09,898 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1] [2021-11-20 22:49:09,936 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-20 22:49:10,114 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2021-11-20 22:49:10,115 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-20 22:49:10,115 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:49:10,115 INFO L85 PathProgramCache]: Analyzing trace with hash -17413066, now seen corresponding path program 13 times [2021-11-20 22:49:10,115 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:49:10,115 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1293953376] [2021-11-20 22:49:10,115 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:49:10,115 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:49:10,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:49:10,392 INFO L134 CoverageAnalysis]: Checked inductivity of 161 backedges. 25 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:49:10,393 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:49:10,393 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1293953376] [2021-11-20 22:49:10,393 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1293953376] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 22:49:10,393 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1367759599] [2021-11-20 22:49:10,393 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 22:49:10,393 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:49:10,393 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 22:49:10,394 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 22:49:10,395 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-20 22:49:10,446 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:49:10,448 INFO L263 TraceCheckSpWp]: Trace formula consists of 256 conjuncts, 50 conjunts are in the unsatisfiable core [2021-11-20 22:49:10,449 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:49:10,825 INFO L134 CoverageAnalysis]: Checked inductivity of 161 backedges. 36 proven. 125 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:49:10,825 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:49:11,155 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2021-11-20 22:49:11,204 INFO L134 CoverageAnalysis]: Checked inductivity of 161 backedges. 36 proven. 125 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:49:11,205 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1367759599] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:49:11,205 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2083098355] [2021-11-20 22:49:11,206 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 22:49:11,206 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 22:49:11,206 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 22:49:11,207 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 22:49:11,207 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 22:49:11,244 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 [2021-11-20 22:49:11,311 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 [2021-11-20 22:49:11,424 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-20 22:49:11,424 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 138 treesize of output 137 [2021-11-20 22:49:11,729 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 23 treesize of output 19 [2021-11-20 22:49:11,799 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 23 treesize of output 19 [2021-11-20 22:49:12,016 INFO L354 Elim1Store]: treesize reduction 28, result has 33.3 percent of original size [2021-11-20 22:49:12,017 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 139 treesize of output 135 [2021-11-20 22:49:14,952 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 22:49:15,579 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 22:49:15,579 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 22:49:15,579 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 17, 17] total 35 [2021-11-20 22:49:15,579 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1751031019] [2021-11-20 22:49:15,580 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 22:49:15,580 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2021-11-20 22:49:15,580 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:49:15,580 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-11-20 22:49:15,581 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=214, Invalid=1678, Unknown=0, NotChecked=0, Total=1892 [2021-11-20 22:49:15,581 INFO L87 Difference]: Start difference. First operand 61 states and 69 transitions. Second operand has 37 states, 36 states have (on average 3.111111111111111) internal successors, (112), 36 states have internal predecessors, (112), 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) [2021-11-20 22:49:16,116 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:49:16,117 INFO L93 Difference]: Finished difference Result 72 states and 82 transitions. [2021-11-20 22:49:16,117 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-20 22:49:16,117 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 36 states have (on average 3.111111111111111) internal successors, (112), 36 states have internal predecessors, (112), 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 53 [2021-11-20 22:49:16,117 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:49:16,118 INFO L225 Difference]: With dead ends: 72 [2021-11-20 22:49:16,118 INFO L226 Difference]: Without dead ends: 72 [2021-11-20 22:49:16,119 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 183 GetRequests, 129 SyntacticMatches, 2 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 745 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=449, Invalid=2413, Unknown=0, NotChecked=0, Total=2862 [2021-11-20 22:49:16,120 INFO L933 BasicCegarLoop]: 24 mSDtfsCounter, 310 mSDsluCounter, 255 mSDsCounter, 0 mSdLazyCounter, 664 mSolverCounterSat, 42 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 310 SdHoareTripleChecker+Valid, 279 SdHoareTripleChecker+Invalid, 706 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 42 IncrementalHoareTripleChecker+Valid, 664 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-20 22:49:16,121 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [310 Valid, 279 Invalid, 706 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [42 Valid, 664 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-20 22:49:16,121 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2021-11-20 22:49:16,123 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 67. [2021-11-20 22:49:16,123 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 66 states have (on average 1.1515151515151516) internal successors, (76), 66 states have internal predecessors, (76), 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) [2021-11-20 22:49:16,123 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 76 transitions. [2021-11-20 22:49:16,124 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 76 transitions. Word has length 53 [2021-11-20 22:49:16,124 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:49:16,124 INFO L470 AbstractCegarLoop]: Abstraction has 67 states and 76 transitions. [2021-11-20 22:49:16,124 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 36 states have (on average 3.111111111111111) internal successors, (112), 36 states have internal predecessors, (112), 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) [2021-11-20 22:49:16,124 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 76 transitions. [2021-11-20 22:49:16,125 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-11-20 22:49:16,125 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:49:16,125 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 7, 7, 1, 1, 1, 1] [2021-11-20 22:49:16,171 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-11-20 22:49:16,344 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2021-11-20 22:49:16,344 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-20 22:49:16,345 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:49:16,345 INFO L85 PathProgramCache]: Analyzing trace with hash -164008690, now seen corresponding path program 14 times [2021-11-20 22:49:16,345 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:49:16,345 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [706624005] [2021-11-20 22:49:16,345 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:49:16,345 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:49:16,367 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:49:16,701 INFO L134 CoverageAnalysis]: Checked inductivity of 197 backedges. 29 proven. 168 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:49:16,701 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:49:16,701 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [706624005] [2021-11-20 22:49:16,701 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [706624005] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 22:49:16,702 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1094258059] [2021-11-20 22:49:16,702 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 22:49:16,702 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:49:16,702 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 22:49:16,702 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 22:49:16,704 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-20 22:49:16,805 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2021-11-20 22:49:16,805 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 22:49:16,807 INFO L263 TraceCheckSpWp]: Trace formula consists of 274 conjuncts, 65 conjunts are in the unsatisfiable core [2021-11-20 22:49:16,809 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:49:17,039 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 21 treesize of output 17 [2021-11-20 22:49:17,253 INFO L134 CoverageAnalysis]: Checked inductivity of 197 backedges. 29 proven. 168 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:49:17,254 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:49:17,385 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-20 22:49:17,387 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 22 [2021-11-20 22:49:17,555 INFO L134 CoverageAnalysis]: Checked inductivity of 197 backedges. 29 proven. 168 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:49:17,556 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1094258059] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:49:17,556 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1639542027] [2021-11-20 22:49:17,557 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 22:49:17,557 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 22:49:17,557 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 22:49:17,558 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 22:49:17,558 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 22:49:17,601 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 [2021-11-20 22:49:17,671 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 23 treesize of output 19 [2021-11-20 22:49:17,786 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:49:17,787 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 144 treesize of output 136 [2021-11-20 22:49:18,020 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 23 treesize of output 19 [2021-11-20 22:49:18,154 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 23 treesize of output 19 [2021-11-20 22:49:18,340 INFO L354 Elim1Store]: treesize reduction 28, result has 33.3 percent of original size [2021-11-20 22:49:18,340 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 139 treesize of output 135 [2021-11-20 22:49:21,302 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 22:49:21,993 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 22:49:21,993 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 22:49:21,993 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 35 [2021-11-20 22:49:21,993 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2117464639] [2021-11-20 22:49:21,993 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 22:49:21,994 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2021-11-20 22:49:21,994 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:49:21,994 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-11-20 22:49:21,995 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=1689, Unknown=0, NotChecked=0, Total=1806 [2021-11-20 22:49:21,995 INFO L87 Difference]: Start difference. First operand 67 states and 76 transitions. Second operand has 36 states, 36 states have (on average 2.5277777777777777) internal successors, (91), 35 states have internal predecessors, (91), 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) [2021-11-20 22:49:22,844 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:49:22,844 INFO L93 Difference]: Finished difference Result 115 states and 131 transitions. [2021-11-20 22:49:22,844 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-11-20 22:49:22,845 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 2.5277777777777777) internal successors, (91), 35 states have internal predecessors, (91), 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 58 [2021-11-20 22:49:22,845 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:49:22,845 INFO L225 Difference]: With dead ends: 115 [2021-11-20 22:49:22,845 INFO L226 Difference]: Without dead ends: 70 [2021-11-20 22:49:22,846 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 209 GetRequests, 148 SyntacticMatches, 3 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 520 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=260, Invalid=3280, Unknown=0, NotChecked=0, Total=3540 [2021-11-20 22:49:22,847 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 86 mSDsluCounter, 489 mSDsCounter, 0 mSdLazyCounter, 1138 mSolverCounterSat, 45 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 86 SdHoareTripleChecker+Valid, 499 SdHoareTripleChecker+Invalid, 1183 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 45 IncrementalHoareTripleChecker+Valid, 1138 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-20 22:49:22,847 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [86 Valid, 499 Invalid, 1183 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [45 Valid, 1138 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-20 22:49:22,848 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2021-11-20 22:49:22,849 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 69. [2021-11-20 22:49:22,850 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69 states, 68 states have (on average 1.1470588235294117) internal successors, (78), 68 states have internal predecessors, (78), 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) [2021-11-20 22:49:22,850 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 78 transitions. [2021-11-20 22:49:22,850 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 78 transitions. Word has length 58 [2021-11-20 22:49:22,850 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:49:22,851 INFO L470 AbstractCegarLoop]: Abstraction has 69 states and 78 transitions. [2021-11-20 22:49:22,851 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 36 states have (on average 2.5277777777777777) internal successors, (91), 35 states have internal predecessors, (91), 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) [2021-11-20 22:49:22,851 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 78 transitions. [2021-11-20 22:49:22,852 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-20 22:49:22,852 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:49:22,852 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1] [2021-11-20 22:49:22,877 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-20 22:49:23,060 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:49:23,060 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-20 22:49:23,061 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:49:23,061 INFO L85 PathProgramCache]: Analyzing trace with hash 600263738, now seen corresponding path program 15 times [2021-11-20 22:49:23,061 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:49:23,061 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [439861254] [2021-11-20 22:49:23,061 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:49:23,061 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:49:23,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:49:23,367 INFO L134 CoverageAnalysis]: Checked inductivity of 212 backedges. 36 proven. 176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:49:23,367 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:49:23,367 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [439861254] [2021-11-20 22:49:23,367 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [439861254] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 22:49:23,367 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1884488295] [2021-11-20 22:49:23,367 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 22:49:23,368 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:49:23,368 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 22:49:23,368 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 22:49:23,369 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-20 22:49:23,435 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 22:49:23,435 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 22:49:23,437 INFO L263 TraceCheckSpWp]: Trace formula consists of 284 conjuncts, 57 conjunts are in the unsatisfiable core [2021-11-20 22:49:23,438 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:49:23,445 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 [2021-11-20 22:49:24,064 INFO L134 CoverageAnalysis]: Checked inductivity of 212 backedges. 49 proven. 163 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:49:24,065 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:49:24,893 INFO L134 CoverageAnalysis]: Checked inductivity of 212 backedges. 64 proven. 148 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:49:24,893 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1884488295] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:49:24,893 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2063566365] [2021-11-20 22:49:24,894 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 22:49:24,894 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 22:49:24,894 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 22:49:24,894 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 22:49:24,894 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 22:49:24,927 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 [2021-11-20 22:49:24,998 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 [2021-11-20 22:49:25,113 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-20 22:49:25,113 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 138 treesize of output 137 [2021-11-20 22:49:25,370 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 23 treesize of output 19 [2021-11-20 22:49:25,466 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 23 treesize of output 19 [2021-11-20 22:49:25,696 INFO L354 Elim1Store]: treesize reduction 28, result has 33.3 percent of original size [2021-11-20 22:49:25,696 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 139 treesize of output 135 [2021-11-20 22:49:28,687 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 22:49:29,437 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 22:49:29,437 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 22:49:29,437 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 19, 19] total 55 [2021-11-20 22:49:29,437 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1140541292] [2021-11-20 22:49:29,437 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 22:49:29,438 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 57 states [2021-11-20 22:49:29,438 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:49:29,438 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2021-11-20 22:49:29,439 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=443, Invalid=3589, Unknown=0, NotChecked=0, Total=4032 [2021-11-20 22:49:29,439 INFO L87 Difference]: Start difference. First operand 69 states and 78 transitions. Second operand has 57 states, 56 states have (on average 3.1607142857142856) internal successors, (177), 56 states have internal predecessors, (177), 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) [2021-11-20 22:49:30,025 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:49:30,025 INFO L93 Difference]: Finished difference Result 80 states and 91 transitions. [2021-11-20 22:49:30,025 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-11-20 22:49:30,025 INFO L78 Accepts]: Start accepts. Automaton has has 57 states, 56 states have (on average 3.1607142857142856) internal successors, (177), 56 states have internal predecessors, (177), 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 60 [2021-11-20 22:49:30,026 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:49:30,026 INFO L225 Difference]: With dead ends: 80 [2021-11-20 22:49:30,026 INFO L226 Difference]: Without dead ends: 80 [2021-11-20 22:49:30,028 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 207 GetRequests, 133 SyntacticMatches, 1 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1714 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=835, Invalid=4715, Unknown=0, NotChecked=0, Total=5550 [2021-11-20 22:49:30,028 INFO L933 BasicCegarLoop]: 27 mSDtfsCounter, 249 mSDsluCounter, 330 mSDsCounter, 0 mSdLazyCounter, 865 mSolverCounterSat, 32 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 249 SdHoareTripleChecker+Valid, 357 SdHoareTripleChecker+Invalid, 897 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 32 IncrementalHoareTripleChecker+Valid, 865 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-20 22:49:30,028 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [249 Valid, 357 Invalid, 897 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [32 Valid, 865 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-20 22:49:30,029 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2021-11-20 22:49:30,030 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 75. [2021-11-20 22:49:30,031 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 74 states have (on average 1.1486486486486487) internal successors, (85), 74 states have internal predecessors, (85), 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) [2021-11-20 22:49:30,031 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 85 transitions. [2021-11-20 22:49:30,031 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 85 transitions. Word has length 60 [2021-11-20 22:49:30,032 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:49:30,032 INFO L470 AbstractCegarLoop]: Abstraction has 75 states and 85 transitions. [2021-11-20 22:49:30,032 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 57 states, 56 states have (on average 3.1607142857142856) internal successors, (177), 56 states have internal predecessors, (177), 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) [2021-11-20 22:49:30,033 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 85 transitions. [2021-11-20 22:49:30,033 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-11-20 22:49:30,033 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:49:30,033 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 9, 8, 8, 1, 1, 1, 1] [2021-11-20 22:49:30,061 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Ended with exit code 0 [2021-11-20 22:49:30,248 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2021-11-20 22:49:30,248 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-20 22:49:30,248 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:49:30,249 INFO L85 PathProgramCache]: Analyzing trace with hash 853266314, now seen corresponding path program 16 times [2021-11-20 22:49:30,249 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:49:30,249 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [282935161] [2021-11-20 22:49:30,249 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:49:30,249 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:49:30,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:49:30,572 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 33 proven. 220 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:49:30,573 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:49:30,573 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [282935161] [2021-11-20 22:49:30,573 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [282935161] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 22:49:30,573 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1609609065] [2021-11-20 22:49:30,573 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 22:49:30,573 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:49:30,573 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 22:49:30,574 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 22:49:30,575 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-11-20 22:49:30,634 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:49:30,636 INFO L263 TraceCheckSpWp]: Trace formula consists of 302 conjuncts, 69 conjunts are in the unsatisfiable core [2021-11-20 22:49:30,637 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:49:30,919 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 21 treesize of output 17 [2021-11-20 22:49:31,102 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2021-11-20 22:49:31,110 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 33 proven. 220 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:49:31,110 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:49:31,224 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-20 22:49:31,225 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 22 [2021-11-20 22:49:31,368 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 33 proven. 220 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:49:31,369 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1609609065] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:49:31,369 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1053970621] [2021-11-20 22:49:31,370 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 22:49:31,370 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 22:49:31,370 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 22:49:31,371 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 22:49:31,371 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 22:49:31,407 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 [2021-11-20 22:49:31,476 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 [2021-11-20 22:49:31,608 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-20 22:49:31,609 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 138 treesize of output 137 [2021-11-20 22:49:31,892 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 23 treesize of output 19 [2021-11-20 22:49:31,980 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 23 treesize of output 19 [2021-11-20 22:49:32,188 INFO L354 Elim1Store]: treesize reduction 28, result has 33.3 percent of original size [2021-11-20 22:49:32,188 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 139 treesize of output 135 [2021-11-20 22:49:35,120 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 22:49:35,871 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 22:49:35,871 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 22:49:35,871 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 37 [2021-11-20 22:49:35,871 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2041977843] [2021-11-20 22:49:35,871 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 22:49:35,872 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2021-11-20 22:49:35,872 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:49:35,872 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-11-20 22:49:35,873 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=1860, Unknown=0, NotChecked=0, Total=1980 [2021-11-20 22:49:35,873 INFO L87 Difference]: Start difference. First operand 75 states and 85 transitions. Second operand has 38 states, 38 states have (on average 2.5789473684210527) internal successors, (98), 37 states have internal predecessors, (98), 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) [2021-11-20 22:49:36,904 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:49:36,904 INFO L93 Difference]: Finished difference Result 129 states and 147 transitions. [2021-11-20 22:49:36,904 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-11-20 22:49:36,905 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 2.5789473684210527) internal successors, (98), 37 states have internal predecessors, (98), 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 65 [2021-11-20 22:49:36,905 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:49:36,905 INFO L225 Difference]: With dead ends: 129 [2021-11-20 22:49:36,905 INFO L226 Difference]: Without dead ends: 78 [2021-11-20 22:49:36,907 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 234 GetRequests, 169 SyntacticMatches, 3 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 550 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=277, Invalid=3755, Unknown=0, NotChecked=0, Total=4032 [2021-11-20 22:49:36,907 INFO L933 BasicCegarLoop]: 25 mSDtfsCounter, 98 mSDsluCounter, 686 mSDsCounter, 0 mSdLazyCounter, 1525 mSolverCounterSat, 51 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 98 SdHoareTripleChecker+Valid, 698 SdHoareTripleChecker+Invalid, 1576 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 51 IncrementalHoareTripleChecker+Valid, 1525 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-20 22:49:36,907 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [98 Valid, 698 Invalid, 1576 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [51 Valid, 1525 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-20 22:49:36,908 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2021-11-20 22:49:36,910 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 77. [2021-11-20 22:49:36,910 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 77 states, 76 states have (on average 1.144736842105263) internal successors, (87), 76 states have internal predecessors, (87), 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) [2021-11-20 22:49:36,910 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 87 transitions. [2021-11-20 22:49:36,911 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 87 transitions. Word has length 65 [2021-11-20 22:49:36,911 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:49:36,911 INFO L470 AbstractCegarLoop]: Abstraction has 77 states and 87 transitions. [2021-11-20 22:49:36,911 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 2.5789473684210527) internal successors, (98), 37 states have internal predecessors, (98), 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) [2021-11-20 22:49:36,911 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 87 transitions. [2021-11-20 22:49:36,912 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-11-20 22:49:36,912 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:49:36,912 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1] [2021-11-20 22:49:36,932 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2021-11-20 22:49:37,112 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2021-11-20 22:49:37,113 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-20 22:49:37,113 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:49:37,113 INFO L85 PathProgramCache]: Analyzing trace with hash 494454494, now seen corresponding path program 17 times [2021-11-20 22:49:37,113 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:49:37,114 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [214870025] [2021-11-20 22:49:37,114 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:49:37,114 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:49:37,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:49:37,460 INFO L134 CoverageAnalysis]: Checked inductivity of 270 backedges. 49 proven. 221 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:49:37,461 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:49:37,461 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [214870025] [2021-11-20 22:49:37,461 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [214870025] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 22:49:37,461 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [404978438] [2021-11-20 22:49:37,461 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 22:49:37,461 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:49:37,461 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 22:49:37,462 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 22:49:37,465 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-11-20 22:49:37,569 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2021-11-20 22:49:37,569 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 22:49:37,571 INFO L263 TraceCheckSpWp]: Trace formula consists of 312 conjuncts, 52 conjunts are in the unsatisfiable core [2021-11-20 22:49:37,573 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:49:38,052 INFO L134 CoverageAnalysis]: Checked inductivity of 270 backedges. 64 proven. 206 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:49:38,052 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:49:38,551 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2021-11-20 22:49:38,612 INFO L134 CoverageAnalysis]: Checked inductivity of 270 backedges. 64 proven. 206 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:49:38,613 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [404978438] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:49:38,613 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [110254562] [2021-11-20 22:49:38,614 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 22:49:38,614 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 22:49:38,614 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 22:49:38,614 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 22:49:38,615 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 22:49:38,669 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 [2021-11-20 22:49:38,732 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 [2021-11-20 22:49:38,860 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-20 22:49:38,860 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 138 treesize of output 137 [2021-11-20 22:49:39,116 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 23 treesize of output 19 [2021-11-20 22:49:39,218 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 23 treesize of output 19 [2021-11-20 22:49:39,498 INFO L354 Elim1Store]: treesize reduction 28, result has 33.3 percent of original size [2021-11-20 22:49:39,498 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 139 treesize of output 135 [2021-11-20 22:49:42,418 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 22:49:43,098 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 22:49:43,098 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 22:49:43,098 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 21, 21] total 52 [2021-11-20 22:49:43,098 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [434987100] [2021-11-20 22:49:43,098 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 22:49:43,099 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 54 states [2021-11-20 22:49:43,099 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:49:43,099 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2021-11-20 22:49:43,100 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=492, Invalid=3168, Unknown=0, NotChecked=0, Total=3660 [2021-11-20 22:49:43,100 INFO L87 Difference]: Start difference. First operand 77 states and 87 transitions. Second operand has 54 states, 53 states have (on average 3.4150943396226414) internal successors, (181), 53 states have internal predecessors, (181), 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) [2021-11-20 22:49:43,614 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:49:43,614 INFO L93 Difference]: Finished difference Result 88 states and 100 transitions. [2021-11-20 22:49:43,614 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-11-20 22:49:43,614 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 53 states have (on average 3.4150943396226414) internal successors, (181), 53 states have internal predecessors, (181), 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 67 [2021-11-20 22:49:43,615 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:49:43,615 INFO L225 Difference]: With dead ends: 88 [2021-11-20 22:49:43,615 INFO L226 Difference]: Without dead ends: 88 [2021-11-20 22:49:43,616 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 231 GetRequests, 159 SyntacticMatches, 1 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1542 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=903, Invalid=4353, Unknown=0, NotChecked=0, Total=5256 [2021-11-20 22:49:43,616 INFO L933 BasicCegarLoop]: 30 mSDtfsCounter, 633 mSDsluCounter, 297 mSDsCounter, 0 mSdLazyCounter, 629 mSolverCounterSat, 82 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 633 SdHoareTripleChecker+Valid, 327 SdHoareTripleChecker+Invalid, 711 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 82 IncrementalHoareTripleChecker+Valid, 629 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-20 22:49:43,616 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [633 Valid, 327 Invalid, 711 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [82 Valid, 629 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-20 22:49:43,617 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2021-11-20 22:49:43,618 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 83. [2021-11-20 22:49:43,619 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 82 states have (on average 1.146341463414634) internal successors, (94), 82 states have internal predecessors, (94), 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) [2021-11-20 22:49:43,619 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 94 transitions. [2021-11-20 22:49:43,619 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 94 transitions. Word has length 67 [2021-11-20 22:49:43,620 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:49:43,620 INFO L470 AbstractCegarLoop]: Abstraction has 83 states and 94 transitions. [2021-11-20 22:49:43,620 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 54 states, 53 states have (on average 3.4150943396226414) internal successors, (181), 53 states have internal predecessors, (181), 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) [2021-11-20 22:49:43,620 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 94 transitions. [2021-11-20 22:49:43,621 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2021-11-20 22:49:43,621 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:49:43,621 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 10, 9, 9, 1, 1, 1, 1] [2021-11-20 22:49:43,646 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-11-20 22:49:43,828 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2021-11-20 22:49:43,828 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-20 22:49:43,829 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:49:43,829 INFO L85 PathProgramCache]: Analyzing trace with hash -421438618, now seen corresponding path program 18 times [2021-11-20 22:49:43,829 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:49:43,829 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [142428504] [2021-11-20 22:49:43,829 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:49:43,830 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:49:43,855 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:49:44,209 INFO L134 CoverageAnalysis]: Checked inductivity of 316 backedges. 37 proven. 279 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:49:44,209 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:49:44,210 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [142428504] [2021-11-20 22:49:44,211 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [142428504] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 22:49:44,211 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1227232465] [2021-11-20 22:49:44,211 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 22:49:44,211 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:49:44,211 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 22:49:44,212 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 22:49:44,213 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-11-20 22:49:44,310 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 22:49:44,310 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 22:49:44,313 INFO L263 TraceCheckSpWp]: Trace formula consists of 330 conjuncts, 75 conjunts are in the unsatisfiable core [2021-11-20 22:49:44,314 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:49:44,594 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 21 treesize of output 17 [2021-11-20 22:49:44,775 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2021-11-20 22:49:44,786 INFO L134 CoverageAnalysis]: Checked inductivity of 316 backedges. 37 proven. 279 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:49:44,786 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:49:44,926 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-20 22:49:44,927 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 22 [2021-11-20 22:49:45,079 INFO L134 CoverageAnalysis]: Checked inductivity of 316 backedges. 37 proven. 279 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:49:45,080 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1227232465] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:49:45,080 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1553461431] [2021-11-20 22:49:45,081 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 22:49:45,081 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 22:49:45,082 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 22:49:45,082 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 22:49:45,082 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 22:49:45,122 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 [2021-11-20 22:49:45,218 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 23 treesize of output 19 [2021-11-20 22:49:45,307 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:49:45,308 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 144 treesize of output 136 [2021-11-20 22:49:45,519 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 23 treesize of output 19 [2021-11-20 22:49:45,603 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 23 treesize of output 19 [2021-11-20 22:49:45,852 INFO L354 Elim1Store]: treesize reduction 28, result has 33.3 percent of original size [2021-11-20 22:49:45,852 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 139 treesize of output 135 [2021-11-20 22:49:48,852 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 22:49:49,599 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 22:49:49,600 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 22:49:49,600 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 40 [2021-11-20 22:49:49,600 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [203759981] [2021-11-20 22:49:49,600 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 22:49:49,600 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2021-11-20 22:49:49,601 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:49:49,601 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-11-20 22:49:49,601 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=127, Invalid=2129, Unknown=0, NotChecked=0, Total=2256 [2021-11-20 22:49:49,602 INFO L87 Difference]: Start difference. First operand 83 states and 94 transitions. Second operand has 41 states, 41 states have (on average 2.6097560975609757) internal successors, (107), 40 states have internal predecessors, (107), 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) [2021-11-20 22:49:50,739 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:49:50,739 INFO L93 Difference]: Finished difference Result 143 states and 163 transitions. [2021-11-20 22:49:50,740 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-11-20 22:49:50,740 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 2.6097560975609757) internal successors, (107), 40 states have internal predecessors, (107), 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 72 [2021-11-20 22:49:50,740 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:49:50,741 INFO L225 Difference]: With dead ends: 143 [2021-11-20 22:49:50,741 INFO L226 Difference]: Without dead ends: 86 [2021-11-20 22:49:50,741 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 259 GetRequests, 189 SyntacticMatches, 3 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 625 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=299, Invalid=4393, Unknown=0, NotChecked=0, Total=4692 [2021-11-20 22:49:50,742 INFO L933 BasicCegarLoop]: 28 mSDtfsCounter, 109 mSDsluCounter, 742 mSDsCounter, 0 mSdLazyCounter, 1637 mSolverCounterSat, 57 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 109 SdHoareTripleChecker+Valid, 753 SdHoareTripleChecker+Invalid, 1694 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 57 IncrementalHoareTripleChecker+Valid, 1637 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-20 22:49:50,742 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [109 Valid, 753 Invalid, 1694 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [57 Valid, 1637 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-20 22:49:50,742 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2021-11-20 22:49:50,743 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 85. [2021-11-20 22:49:50,744 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 84 states have (on average 1.1428571428571428) internal successors, (96), 84 states have internal predecessors, (96), 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) [2021-11-20 22:49:50,744 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 96 transitions. [2021-11-20 22:49:50,744 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 96 transitions. Word has length 72 [2021-11-20 22:49:50,745 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:49:50,745 INFO L470 AbstractCegarLoop]: Abstraction has 85 states and 96 transitions. [2021-11-20 22:49:50,745 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 41 states have (on average 2.6097560975609757) internal successors, (107), 40 states have internal predecessors, (107), 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) [2021-11-20 22:49:50,745 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 96 transitions. [2021-11-20 22:49:50,753 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-11-20 22:49:50,753 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:49:50,753 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 10, 10, 10, 1, 1, 1, 1] [2021-11-20 22:49:50,773 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2021-11-20 22:49:50,954 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2021-11-20 22:49:50,954 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-20 22:49:50,954 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:49:50,955 INFO L85 PathProgramCache]: Analyzing trace with hash 1827880338, now seen corresponding path program 19 times [2021-11-20 22:49:50,955 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:49:50,955 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [54214346] [2021-11-20 22:49:50,955 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:49:50,955 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:49:50,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:49:51,391 INFO L134 CoverageAnalysis]: Checked inductivity of 335 backedges. 64 proven. 271 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:49:51,391 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:49:51,391 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [54214346] [2021-11-20 22:49:51,392 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [54214346] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 22:49:51,392 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1110137468] [2021-11-20 22:49:51,392 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 22:49:51,392 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:49:51,392 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 22:49:51,393 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 22:49:51,409 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2021-11-20 22:49:51,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:49:51,474 INFO L263 TraceCheckSpWp]: Trace formula consists of 340 conjuncts, 65 conjunts are in the unsatisfiable core [2021-11-20 22:49:51,476 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:49:51,961 INFO L134 CoverageAnalysis]: Checked inductivity of 335 backedges. 81 proven. 254 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:49:51,961 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:49:52,451 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2021-11-20 22:49:52,508 INFO L134 CoverageAnalysis]: Checked inductivity of 335 backedges. 81 proven. 254 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:49:52,508 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1110137468] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:49:52,508 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [34333673] [2021-11-20 22:49:52,509 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 22:49:52,509 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 22:49:52,509 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 22:49:52,510 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 22:49:52,510 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 22:49:52,549 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 [2021-11-20 22:49:52,609 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 23 treesize of output 19 [2021-11-20 22:49:52,712 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:49:52,713 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 144 treesize of output 136 [2021-11-20 22:49:52,909 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 23 treesize of output 19 [2021-11-20 22:49:53,033 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 23 treesize of output 19 [2021-11-20 22:49:53,274 INFO L354 Elim1Store]: treesize reduction 28, result has 33.3 percent of original size [2021-11-20 22:49:53,274 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 139 treesize of output 135 [2021-11-20 22:49:56,281 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 22:49:56,984 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 22:49:56,984 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 22:49:56,984 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 23, 23] total 47 [2021-11-20 22:49:56,984 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [222319200] [2021-11-20 22:49:56,984 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 22:49:56,985 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2021-11-20 22:49:56,985 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:49:56,985 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-11-20 22:49:56,985 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=343, Invalid=2737, Unknown=0, NotChecked=0, Total=3080 [2021-11-20 22:49:56,986 INFO L87 Difference]: Start difference. First operand 85 states and 96 transitions. Second operand has 49 states, 48 states have (on average 3.2083333333333335) internal successors, (154), 48 states have internal predecessors, (154), 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) [2021-11-20 22:49:57,763 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:49:57,763 INFO L93 Difference]: Finished difference Result 96 states and 109 transitions. [2021-11-20 22:49:57,763 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-20 22:49:57,763 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 48 states have (on average 3.2083333333333335) internal successors, (154), 48 states have internal predecessors, (154), 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 74 [2021-11-20 22:49:57,763 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:49:57,764 INFO L225 Difference]: With dead ends: 96 [2021-11-20 22:49:57,764 INFO L226 Difference]: Without dead ends: 96 [2021-11-20 22:49:57,764 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 255 GetRequests, 186 SyntacticMatches, 2 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1261 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=746, Invalid=3946, Unknown=0, NotChecked=0, Total=4692 [2021-11-20 22:49:57,765 INFO L933 BasicCegarLoop]: 33 mSDtfsCounter, 438 mSDsluCounter, 471 mSDsCounter, 0 mSdLazyCounter, 1228 mSolverCounterSat, 61 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 438 SdHoareTripleChecker+Valid, 504 SdHoareTripleChecker+Invalid, 1289 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 61 IncrementalHoareTripleChecker+Valid, 1228 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-20 22:49:57,765 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [438 Valid, 504 Invalid, 1289 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [61 Valid, 1228 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-20 22:49:57,766 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2021-11-20 22:49:57,767 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 91. [2021-11-20 22:49:57,767 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91 states, 90 states have (on average 1.1444444444444444) internal successors, (103), 90 states have internal predecessors, (103), 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) [2021-11-20 22:49:57,768 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 103 transitions. [2021-11-20 22:49:57,768 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 103 transitions. Word has length 74 [2021-11-20 22:49:57,768 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:49:57,768 INFO L470 AbstractCegarLoop]: Abstraction has 91 states and 103 transitions. [2021-11-20 22:49:57,769 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 48 states have (on average 3.2083333333333335) internal successors, (154), 48 states have internal predecessors, (154), 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) [2021-11-20 22:49:57,769 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 103 transitions. [2021-11-20 22:49:57,770 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-11-20 22:49:57,770 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:49:57,770 INFO L514 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 11, 10, 10, 1, 1, 1, 1] [2021-11-20 22:49:57,793 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Ended with exit code 0 [2021-11-20 22:49:57,980 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-11-20 22:49:57,980 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-20 22:49:57,980 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:49:57,981 INFO L85 PathProgramCache]: Analyzing trace with hash -1029114574, now seen corresponding path program 20 times [2021-11-20 22:49:57,981 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:49:57,981 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1045973717] [2021-11-20 22:49:57,981 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:49:57,981 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:49:58,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:49:58,483 INFO L134 CoverageAnalysis]: Checked inductivity of 386 backedges. 41 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:49:58,483 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:49:58,483 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1045973717] [2021-11-20 22:49:58,484 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1045973717] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 22:49:58,484 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1406274525] [2021-11-20 22:49:58,484 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 22:49:58,484 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:49:58,484 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 22:49:58,485 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 22:49:58,510 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-11-20 22:49:58,735 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2021-11-20 22:49:58,735 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 22:49:58,739 INFO L263 TraceCheckSpWp]: Trace formula consists of 358 conjuncts, 79 conjunts are in the unsatisfiable core [2021-11-20 22:49:58,741 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:49:59,086 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 21 treesize of output 17 [2021-11-20 22:49:59,274 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2021-11-20 22:49:59,282 INFO L134 CoverageAnalysis]: Checked inductivity of 386 backedges. 41 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:49:59,282 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:49:59,418 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-20 22:49:59,419 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 22 [2021-11-20 22:49:59,589 INFO L134 CoverageAnalysis]: Checked inductivity of 386 backedges. 41 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:49:59,589 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1406274525] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:49:59,589 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [155250421] [2021-11-20 22:49:59,590 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 22:49:59,590 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 22:49:59,590 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 22:49:59,591 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 22:49:59,591 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 22:49:59,635 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 [2021-11-20 22:49:59,691 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 23 treesize of output 19 [2021-11-20 22:49:59,798 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:49:59,799 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 144 treesize of output 136 [2021-11-20 22:50:00,094 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 23 treesize of output 19 [2021-11-20 22:50:00,205 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 23 treesize of output 19 [2021-11-20 22:50:00,491 INFO L354 Elim1Store]: treesize reduction 28, result has 33.3 percent of original size [2021-11-20 22:50:00,492 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 139 treesize of output 135 [2021-11-20 22:50:03,414 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 22:50:04,177 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 22:50:04,177 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 22:50:04,177 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 43 [2021-11-20 22:50:04,177 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1317097092] [2021-11-20 22:50:04,177 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 22:50:04,178 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2021-11-20 22:50:04,178 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:50:04,178 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-11-20 22:50:04,179 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=2416, Unknown=0, NotChecked=0, Total=2550 [2021-11-20 22:50:04,179 INFO L87 Difference]: Start difference. First operand 91 states and 103 transitions. Second operand has 44 states, 44 states have (on average 2.6363636363636362) internal successors, (116), 43 states have internal predecessors, (116), 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) [2021-11-20 22:50:05,550 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:50:05,550 INFO L93 Difference]: Finished difference Result 157 states and 179 transitions. [2021-11-20 22:50:05,550 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-11-20 22:50:05,550 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 2.6363636363636362) internal successors, (116), 43 states have internal predecessors, (116), 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 79 [2021-11-20 22:50:05,551 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:50:05,551 INFO L225 Difference]: With dead ends: 157 [2021-11-20 22:50:05,551 INFO L226 Difference]: Without dead ends: 94 [2021-11-20 22:50:05,552 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 284 GetRequests, 209 SyntacticMatches, 3 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 705 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=321, Invalid=5081, Unknown=0, NotChecked=0, Total=5402 [2021-11-20 22:50:05,552 INFO L933 BasicCegarLoop]: 31 mSDtfsCounter, 276 mSDsluCounter, 900 mSDsCounter, 0 mSdLazyCounter, 1903 mSolverCounterSat, 123 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 276 SdHoareTripleChecker+Valid, 917 SdHoareTripleChecker+Invalid, 2084 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 123 IncrementalHoareTripleChecker+Valid, 1903 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 58 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-20 22:50:05,553 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [276 Valid, 917 Invalid, 2084 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [123 Valid, 1903 Invalid, 0 Unknown, 58 Unchecked, 0.7s Time] [2021-11-20 22:50:05,553 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2021-11-20 22:50:05,555 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 93. [2021-11-20 22:50:05,555 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 93 states, 92 states have (on average 1.141304347826087) internal successors, (105), 92 states have internal predecessors, (105), 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) [2021-11-20 22:50:05,556 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 105 transitions. [2021-11-20 22:50:05,556 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 105 transitions. Word has length 79 [2021-11-20 22:50:05,556 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:50:05,556 INFO L470 AbstractCegarLoop]: Abstraction has 93 states and 105 transitions. [2021-11-20 22:50:05,556 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 44 states have (on average 2.6363636363636362) internal successors, (116), 43 states have internal predecessors, (116), 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) [2021-11-20 22:50:05,557 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 105 transitions. [2021-11-20 22:50:05,557 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-11-20 22:50:05,557 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:50:05,558 INFO L514 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 11, 11, 11, 1, 1, 1, 1] [2021-11-20 22:50:05,587 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2021-11-20 22:50:05,771 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-11-20 22:50:05,771 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-20 22:50:05,771 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:50:05,772 INFO L85 PathProgramCache]: Analyzing trace with hash 466127238, now seen corresponding path program 21 times [2021-11-20 22:50:05,772 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:50:05,772 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1214439030] [2021-11-20 22:50:05,772 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:50:05,772 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:50:05,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:50:06,263 INFO L134 CoverageAnalysis]: Checked inductivity of 407 backedges. 81 proven. 326 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:50:06,263 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:50:06,263 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1214439030] [2021-11-20 22:50:06,263 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1214439030] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 22:50:06,264 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1575474136] [2021-11-20 22:50:06,264 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 22:50:06,264 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:50:06,264 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 22:50:06,265 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 22:50:06,272 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2021-11-20 22:50:06,381 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 22:50:06,381 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 22:50:06,384 INFO L263 TraceCheckSpWp]: Trace formula consists of 368 conjuncts, 72 conjunts are in the unsatisfiable core [2021-11-20 22:50:06,386 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:50:06,392 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 [2021-11-20 22:50:07,313 INFO L134 CoverageAnalysis]: Checked inductivity of 407 backedges. 100 proven. 307 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:50:07,313 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:50:08,495 INFO L134 CoverageAnalysis]: Checked inductivity of 407 backedges. 121 proven. 286 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:50:08,495 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1575474136] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:50:08,495 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [3607660] [2021-11-20 22:50:08,496 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 22:50:08,496 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 22:50:08,496 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 22:50:08,496 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 22:50:08,496 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 22:50:08,525 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 [2021-11-20 22:50:08,590 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 [2021-11-20 22:50:08,696 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-20 22:50:08,696 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 138 treesize of output 137 [2021-11-20 22:50:08,998 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 23 treesize of output 19 [2021-11-20 22:50:09,085 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 23 treesize of output 19 [2021-11-20 22:50:09,336 INFO L354 Elim1Store]: treesize reduction 28, result has 33.3 percent of original size [2021-11-20 22:50:09,336 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 139 treesize of output 135 [2021-11-20 22:50:12,259 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 22:50:13,104 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 22:50:13,105 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 22:50:13,105 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 25, 25] total 73 [2021-11-20 22:50:13,105 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [984686091] [2021-11-20 22:50:13,105 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 22:50:13,106 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 75 states [2021-11-20 22:50:13,106 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:50:13,107 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 75 interpolants. [2021-11-20 22:50:13,107 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=725, Invalid=5917, Unknown=0, NotChecked=0, Total=6642 [2021-11-20 22:50:13,108 INFO L87 Difference]: Start difference. First operand 93 states and 105 transitions. Second operand has 75 states, 74 states have (on average 3.2432432432432434) internal successors, (240), 74 states have internal predecessors, (240), 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) [2021-11-20 22:50:14,079 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:50:14,079 INFO L93 Difference]: Finished difference Result 104 states and 118 transitions. [2021-11-20 22:50:14,080 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-11-20 22:50:14,080 INFO L78 Accepts]: Start accepts. Automaton has has 75 states, 74 states have (on average 3.2432432432432434) internal successors, (240), 74 states have internal predecessors, (240), 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 81 [2021-11-20 22:50:14,080 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:50:14,081 INFO L225 Difference]: With dead ends: 104 [2021-11-20 22:50:14,081 INFO L226 Difference]: Without dead ends: 104 [2021-11-20 22:50:14,082 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 279 GetRequests, 184 SyntacticMatches, 1 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2962 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=1372, Invalid=7748, Unknown=0, NotChecked=0, Total=9120 [2021-11-20 22:50:14,083 INFO L933 BasicCegarLoop]: 36 mSDtfsCounter, 693 mSDsluCounter, 720 mSDsCounter, 0 mSdLazyCounter, 1721 mSolverCounterSat, 107 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 693 SdHoareTripleChecker+Valid, 756 SdHoareTripleChecker+Invalid, 1828 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 107 IncrementalHoareTripleChecker+Valid, 1721 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-20 22:50:14,083 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [693 Valid, 756 Invalid, 1828 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [107 Valid, 1721 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-20 22:50:14,083 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2021-11-20 22:50:14,085 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 99. [2021-11-20 22:50:14,086 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99 states, 98 states have (on average 1.1428571428571428) internal successors, (112), 98 states have internal predecessors, (112), 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) [2021-11-20 22:50:14,086 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 112 transitions. [2021-11-20 22:50:14,086 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 112 transitions. Word has length 81 [2021-11-20 22:50:14,086 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:50:14,087 INFO L470 AbstractCegarLoop]: Abstraction has 99 states and 112 transitions. [2021-11-20 22:50:14,087 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 75 states, 74 states have (on average 3.2432432432432434) internal successors, (240), 74 states have internal predecessors, (240), 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) [2021-11-20 22:50:14,087 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 112 transitions. [2021-11-20 22:50:14,088 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2021-11-20 22:50:14,088 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:50:14,088 INFO L514 BasicCegarLoop]: trace histogram [12, 12, 12, 12, 12, 11, 11, 1, 1, 1, 1] [2021-11-20 22:50:14,124 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2021-11-20 22:50:14,316 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:50:14,316 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-20 22:50:14,316 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:50:14,317 INFO L85 PathProgramCache]: Analyzing trace with hash -1396112962, now seen corresponding path program 22 times [2021-11-20 22:50:14,317 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:50:14,317 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [481475490] [2021-11-20 22:50:14,317 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:50:14,317 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:50:14,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:50:14,878 INFO L134 CoverageAnalysis]: Checked inductivity of 463 backedges. 45 proven. 418 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:50:14,879 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:50:14,879 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [481475490] [2021-11-20 22:50:14,879 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [481475490] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 22:50:14,879 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1606793849] [2021-11-20 22:50:14,879 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 22:50:14,879 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:50:14,879 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 22:50:14,884 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 22:50:14,900 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2021-11-20 22:50:14,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:50:14,976 INFO L263 TraceCheckSpWp]: Trace formula consists of 386 conjuncts, 78 conjunts are in the unsatisfiable core [2021-11-20 22:50:14,978 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:50:15,335 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 28 treesize of output 24 [2021-11-20 22:50:17,401 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-20 22:50:17,402 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 33 treesize of output 33 [2021-11-20 22:50:17,614 INFO L134 CoverageAnalysis]: Checked inductivity of 463 backedges. 100 proven. 363 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:50:17,614 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:50:18,871 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 36 treesize of output 34 [2021-11-20 22:50:18,873 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 46 treesize of output 42 [2021-11-20 22:50:18,876 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 38 treesize of output 30 [2021-11-20 22:50:18,969 INFO L134 CoverageAnalysis]: Checked inductivity of 463 backedges. 100 proven. 363 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:50:18,969 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1606793849] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:50:18,970 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1002337704] [2021-11-20 22:50:18,971 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 22:50:18,971 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 22:50:18,971 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 22:50:18,971 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 22:50:18,972 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 22:50:18,982 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 [2021-11-20 22:50:19,065 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 [2021-11-20 22:50:19,182 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-20 22:50:19,183 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 138 treesize of output 137 [2021-11-20 22:50:19,460 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 23 treesize of output 19 [2021-11-20 22:50:19,566 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 23 treesize of output 19 [2021-11-20 22:50:19,818 INFO L354 Elim1Store]: treesize reduction 28, result has 33.3 percent of original size [2021-11-20 22:50:19,818 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 139 treesize of output 135 [2021-11-20 22:50:22,748 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 22:50:23,800 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 22:50:23,800 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 22:50:23,800 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 72 [2021-11-20 22:50:23,800 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [671251341] [2021-11-20 22:50:23,800 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 22:50:23,801 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 73 states [2021-11-20 22:50:23,801 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:50:23,801 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2021-11-20 22:50:23,802 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=434, Invalid=5886, Unknown=0, NotChecked=0, Total=6320 [2021-11-20 22:50:23,802 INFO L87 Difference]: Start difference. First operand 99 states and 112 transitions. Second operand has 73 states, 73 states have (on average 3.2054794520547945) internal successors, (234), 72 states have internal predecessors, (234), 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) [2021-11-20 22:50:25,797 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:50:25,797 INFO L93 Difference]: Finished difference Result 239 states and 274 transitions. [2021-11-20 22:50:25,798 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-11-20 22:50:25,798 INFO L78 Accepts]: Start accepts. Automaton has has 73 states, 73 states have (on average 3.2054794520547945) internal successors, (234), 72 states have internal predecessors, (234), 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 86 [2021-11-20 22:50:25,798 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:50:25,800 INFO L225 Difference]: With dead ends: 239 [2021-11-20 22:50:25,800 INFO L226 Difference]: Without dead ends: 236 [2021-11-20 22:50:25,801 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 335 GetRequests, 237 SyntacticMatches, 1 SemanticMatches, 97 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1779 ImplicationChecksByTransitivity, 5.0s TimeCoverageRelationStatistics Valid=726, Invalid=8976, Unknown=0, NotChecked=0, Total=9702 [2021-11-20 22:50:25,801 INFO L933 BasicCegarLoop]: 36 mSDtfsCounter, 314 mSDsluCounter, 1112 mSDsCounter, 0 mSdLazyCounter, 886 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 314 SdHoareTripleChecker+Valid, 1142 SdHoareTripleChecker+Invalid, 987 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 886 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 81 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-20 22:50:25,802 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [314 Valid, 1142 Invalid, 987 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 886 Invalid, 0 Unknown, 81 Unchecked, 0.3s Time] [2021-11-20 22:50:25,802 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 236 states. [2021-11-20 22:50:25,806 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 236 to 211. [2021-11-20 22:50:25,807 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 211 states, 210 states have (on average 1.1714285714285715) internal successors, (246), 210 states have internal predecessors, (246), 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) [2021-11-20 22:50:25,807 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 211 states to 211 states and 246 transitions. [2021-11-20 22:50:25,808 INFO L78 Accepts]: Start accepts. Automaton has 211 states and 246 transitions. Word has length 86 [2021-11-20 22:50:25,808 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:50:25,808 INFO L470 AbstractCegarLoop]: Abstraction has 211 states and 246 transitions. [2021-11-20 22:50:25,808 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 73 states, 73 states have (on average 3.2054794520547945) internal successors, (234), 72 states have internal predecessors, (234), 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) [2021-11-20 22:50:25,809 INFO L276 IsEmpty]: Start isEmpty. Operand 211 states and 246 transitions. [2021-11-20 22:50:25,809 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2021-11-20 22:50:25,810 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:50:25,810 INFO L514 BasicCegarLoop]: trace histogram [12, 12, 12, 12, 11, 11, 11, 1, 1, 1, 1, 1, 1] [2021-11-20 22:50:25,832 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Ended with exit code 0 [2021-11-20 22:50:26,012 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:50:26,012 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-20 22:50:26,013 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:50:26,013 INFO L85 PathProgramCache]: Analyzing trace with hash -1903788253, now seen corresponding path program 2 times [2021-11-20 22:50:26,013 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:50:26,013 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1190889058] [2021-11-20 22:50:26,013 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:50:26,013 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:50:26,046 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:50:26,597 INFO L134 CoverageAnalysis]: Checked inductivity of 463 backedges. 45 proven. 418 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:50:26,598 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:50:26,598 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1190889058] [2021-11-20 22:50:26,598 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1190889058] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 22:50:26,598 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [952416360] [2021-11-20 22:50:26,598 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 22:50:26,598 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:50:26,598 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 22:50:26,599 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 22:50:26,600 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2021-11-20 22:50:26,838 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 13 check-sat command(s) [2021-11-20 22:50:26,838 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 22:50:26,841 INFO L263 TraceCheckSpWp]: Trace formula consists of 394 conjuncts, 88 conjunts are in the unsatisfiable core [2021-11-20 22:50:26,843 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:50:27,236 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 21 treesize of output 17 [2021-11-20 22:50:27,325 INFO L354 Elim1Store]: treesize reduction 26, result has 27.8 percent of original size [2021-11-20 22:50:27,326 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 28 treesize of output 27 [2021-11-20 22:50:27,459 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2021-11-20 22:50:27,467 INFO L134 CoverageAnalysis]: Checked inductivity of 463 backedges. 45 proven. 418 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:50:27,467 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:50:27,658 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-20 22:50:27,660 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 22 [2021-11-20 22:50:27,839 INFO L134 CoverageAnalysis]: Checked inductivity of 463 backedges. 45 proven. 418 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:50:27,839 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [952416360] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:50:27,840 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2013595183] [2021-11-20 22:50:27,841 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-20 22:50:27,841 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 22:50:27,841 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 22:50:27,841 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 22:50:27,841 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 22:50:27,851 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 [2021-11-20 22:50:27,951 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 23 treesize of output 19 [2021-11-20 22:50:28,032 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:50:28,032 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 144 treesize of output 136 [2021-11-20 22:50:28,254 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 23 treesize of output 19 [2021-11-20 22:50:28,367 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 23 treesize of output 19 [2021-11-20 22:50:28,592 INFO L354 Elim1Store]: treesize reduction 28, result has 33.3 percent of original size [2021-11-20 22:50:28,592 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 139 treesize of output 135 [2021-11-20 22:50:31,327 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 11 treesize of output 7 [2021-11-20 22:50:33,701 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 11 treesize of output 7 [2021-11-20 22:50:35,464 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 11 treesize of output 7 [2021-11-20 22:50:37,811 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 11 treesize of output 7 [2021-11-20 22:50:40,798 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 22:50:42,300 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 22:50:42,300 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 22:50:42,301 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 46 [2021-11-20 22:50:42,301 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [255745630] [2021-11-20 22:50:42,301 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 22:50:42,301 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 47 states [2021-11-20 22:50:42,301 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:50:42,302 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2021-11-20 22:50:42,302 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=150, Invalid=2930, Unknown=0, NotChecked=0, Total=3080 [2021-11-20 22:50:42,302 INFO L87 Difference]: Start difference. First operand 211 states and 246 transitions. Second operand has 47 states, 47 states have (on average 2.723404255319149) internal successors, (128), 46 states have internal predecessors, (128), 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) [2021-11-20 22:50:43,861 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:50:43,861 INFO L93 Difference]: Finished difference Result 276 states and 320 transitions. [2021-11-20 22:50:43,862 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-11-20 22:50:43,862 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 2.723404255319149) internal successors, (128), 46 states have internal predecessors, (128), 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 87 [2021-11-20 22:50:43,862 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:50:43,863 INFO L225 Difference]: With dead ends: 276 [2021-11-20 22:50:43,863 INFO L226 Difference]: Without dead ends: 157 [2021-11-20 22:50:43,864 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 313 GetRequests, 229 SyntacticMatches, 5 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 904 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=352, Invalid=6128, Unknown=0, NotChecked=0, Total=6480 [2021-11-20 22:50:43,864 INFO L933 BasicCegarLoop]: 34 mSDtfsCounter, 130 mSDsluCounter, 977 mSDsCounter, 0 mSdLazyCounter, 2167 mSolverCounterSat, 67 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 130 SdHoareTripleChecker+Valid, 993 SdHoareTripleChecker+Invalid, 2234 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 67 IncrementalHoareTripleChecker+Valid, 2167 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-20 22:50:43,864 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [130 Valid, 993 Invalid, 2234 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [67 Valid, 2167 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-20 22:50:43,865 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 157 states. [2021-11-20 22:50:43,867 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 157 to 156. [2021-11-20 22:50:43,867 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 156 states, 155 states have (on average 1.1612903225806452) internal successors, (180), 155 states have internal predecessors, (180), 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) [2021-11-20 22:50:43,868 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 156 states to 156 states and 180 transitions. [2021-11-20 22:50:43,868 INFO L78 Accepts]: Start accepts. Automaton has 156 states and 180 transitions. Word has length 87 [2021-11-20 22:50:43,868 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:50:43,868 INFO L470 AbstractCegarLoop]: Abstraction has 156 states and 180 transitions. [2021-11-20 22:50:43,868 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 47 states, 47 states have (on average 2.723404255319149) internal successors, (128), 46 states have internal predecessors, (128), 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) [2021-11-20 22:50:43,868 INFO L276 IsEmpty]: Start isEmpty. Operand 156 states and 180 transitions. [2021-11-20 22:50:43,869 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2021-11-20 22:50:43,869 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:50:43,869 INFO L514 BasicCegarLoop]: trace histogram [12, 12, 12, 12, 12, 12, 11, 1, 1, 1, 1, 1, 1] [2021-11-20 22:50:43,905 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Ended with exit code 0 [2021-11-20 22:50:44,084 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable31 [2021-11-20 22:50:44,084 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-20 22:50:44,085 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:50:44,085 INFO L85 PathProgramCache]: Analyzing trace with hash -1891205257, now seen corresponding path program 3 times [2021-11-20 22:50:44,085 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:50:44,085 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [602228781] [2021-11-20 22:50:44,085 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:50:44,085 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:50:44,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:50:44,554 INFO L134 CoverageAnalysis]: Checked inductivity of 486 backedges. 100 proven. 386 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:50:44,555 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:50:44,555 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [602228781] [2021-11-20 22:50:44,555 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [602228781] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 22:50:44,555 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [153331624] [2021-11-20 22:50:44,555 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 22:50:44,555 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:50:44,555 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 22:50:44,556 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 22:50:44,557 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2021-11-20 22:50:44,693 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 22:50:44,693 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 22:50:44,696 INFO L263 TraceCheckSpWp]: Trace formula consists of 404 conjuncts, 77 conjunts are in the unsatisfiable core [2021-11-20 22:50:44,697 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:50:44,702 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 [2021-11-20 22:50:45,722 INFO L134 CoverageAnalysis]: Checked inductivity of 486 backedges. 121 proven. 365 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:50:45,723 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:50:47,096 INFO L134 CoverageAnalysis]: Checked inductivity of 486 backedges. 144 proven. 342 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:50:47,096 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [153331624] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:50:47,096 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [353247705] [2021-11-20 22:50:47,097 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-20 22:50:47,097 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 22:50:47,098 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 22:50:47,098 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 22:50:47,098 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 22:50:47,147 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 [2021-11-20 22:50:47,215 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 23 treesize of output 19 [2021-11-20 22:50:47,298 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:50:47,299 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 144 treesize of output 136 [2021-11-20 22:50:47,534 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 23 treesize of output 19 [2021-11-20 22:50:47,620 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 23 treesize of output 19 [2021-11-20 22:50:47,887 INFO L354 Elim1Store]: treesize reduction 28, result has 33.3 percent of original size [2021-11-20 22:50:47,888 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 139 treesize of output 135 [2021-11-20 22:50:50,620 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 11 treesize of output 7 [2021-11-20 22:50:52,955 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 11 treesize of output 7 [2021-11-20 22:50:54,764 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 11 treesize of output 7 [2021-11-20 22:50:57,156 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 11 treesize of output 7 [2021-11-20 22:51:00,148 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 22:51:01,842 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 22:51:01,842 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 22:51:01,842 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 27, 27] total 79 [2021-11-20 22:51:01,843 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1747969794] [2021-11-20 22:51:01,843 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 22:51:01,843 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 81 states [2021-11-20 22:51:01,843 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:51:01,843 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 81 interpolants. [2021-11-20 22:51:01,844 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=844, Invalid=7166, Unknown=0, NotChecked=0, Total=8010 [2021-11-20 22:51:01,844 INFO L87 Difference]: Start difference. First operand 156 states and 180 transitions. Second operand has 81 states, 80 states have (on average 3.2875) internal successors, (263), 80 states have internal predecessors, (263), 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) [2021-11-20 22:51:02,982 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:51:02,982 INFO L93 Difference]: Finished difference Result 169 states and 195 transitions. [2021-11-20 22:51:02,983 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-11-20 22:51:02,983 INFO L78 Accepts]: Start accepts. Automaton has has 81 states, 80 states have (on average 3.2875) internal successors, (263), 80 states have internal predecessors, (263), 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 89 [2021-11-20 22:51:02,983 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:51:02,984 INFO L225 Difference]: With dead ends: 169 [2021-11-20 22:51:02,984 INFO L226 Difference]: Without dead ends: 169 [2021-11-20 22:51:02,985 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 306 GetRequests, 202 SyntacticMatches, 1 SemanticMatches, 103 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3636 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=1590, Invalid=9330, Unknown=0, NotChecked=0, Total=10920 [2021-11-20 22:51:02,986 INFO L933 BasicCegarLoop]: 39 mSDtfsCounter, 1165 mSDsluCounter, 717 mSDsCounter, 0 mSdLazyCounter, 1589 mSolverCounterSat, 173 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1165 SdHoareTripleChecker+Valid, 756 SdHoareTripleChecker+Invalid, 1762 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 173 IncrementalHoareTripleChecker+Valid, 1589 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-20 22:51:02,986 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1165 Valid, 756 Invalid, 1762 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [173 Valid, 1589 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-20 22:51:02,986 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 169 states. [2021-11-20 22:51:02,989 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 169 to 107. [2021-11-20 22:51:02,989 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 107 states, 106 states have (on average 1.1415094339622642) internal successors, (121), 106 states have internal predecessors, (121), 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) [2021-11-20 22:51:02,989 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 121 transitions. [2021-11-20 22:51:02,990 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 121 transitions. Word has length 89 [2021-11-20 22:51:02,990 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:51:02,990 INFO L470 AbstractCegarLoop]: Abstraction has 107 states and 121 transitions. [2021-11-20 22:51:02,990 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 81 states, 80 states have (on average 3.2875) internal successors, (263), 80 states have internal predecessors, (263), 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) [2021-11-20 22:51:02,990 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 121 transitions. [2021-11-20 22:51:02,991 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2021-11-20 22:51:02,991 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:51:02,991 INFO L514 BasicCegarLoop]: trace histogram [13, 13, 13, 13, 13, 12, 12, 1, 1, 1, 1] [2021-11-20 22:51:03,019 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Forceful destruction successful, exit code 0 [2021-11-20 22:51:03,212 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable32 [2021-11-20 22:51:03,212 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-20 22:51:03,213 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:51:03,213 INFO L85 PathProgramCache]: Analyzing trace with hash -2042453286, now seen corresponding path program 23 times [2021-11-20 22:51:03,213 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:51:03,213 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [365420738] [2021-11-20 22:51:03,213 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:51:03,213 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:51:03,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:51:03,859 INFO L134 CoverageAnalysis]: Checked inductivity of 547 backedges. 49 proven. 498 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:51:03,859 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:51:03,859 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [365420738] [2021-11-20 22:51:03,859 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [365420738] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 22:51:03,859 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [195504092] [2021-11-20 22:51:03,859 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 22:51:03,860 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:51:03,860 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 22:51:03,860 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 22:51:03,880 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2021-11-20 22:51:04,182 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2021-11-20 22:51:04,183 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 22:51:04,187 INFO L263 TraceCheckSpWp]: Trace formula consists of 414 conjuncts, 93 conjunts are in the unsatisfiable core [2021-11-20 22:51:04,190 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:51:04,647 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 21 treesize of output 17 [2021-11-20 22:51:04,889 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2021-11-20 22:51:04,896 INFO L134 CoverageAnalysis]: Checked inductivity of 547 backedges. 49 proven. 498 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:51:04,896 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:51:05,058 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-20 22:51:05,059 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 22 [2021-11-20 22:51:05,250 INFO L134 CoverageAnalysis]: Checked inductivity of 547 backedges. 49 proven. 498 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:51:05,251 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [195504092] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:51:05,251 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [32821473] [2021-11-20 22:51:05,252 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 22:51:05,252 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 22:51:05,252 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 22:51:05,252 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 22:51:05,252 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 22:51:05,261 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 [2021-11-20 22:51:05,360 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 [2021-11-20 22:51:05,464 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-20 22:51:05,465 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 138 treesize of output 137 [2021-11-20 22:51:05,743 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 23 treesize of output 19 [2021-11-20 22:51:05,852 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 23 treesize of output 19 [2021-11-20 22:51:06,109 INFO L354 Elim1Store]: treesize reduction 28, result has 33.3 percent of original size [2021-11-20 22:51:06,109 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 139 treesize of output 135 [2021-11-20 22:51:09,175 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 22:51:10,000 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 22:51:10,000 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 22:51:10,000 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 49 [2021-11-20 22:51:10,000 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2072688087] [2021-11-20 22:51:10,000 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 22:51:10,001 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2021-11-20 22:51:10,001 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:51:10,001 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-11-20 22:51:10,001 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=148, Invalid=3044, Unknown=0, NotChecked=0, Total=3192 [2021-11-20 22:51:10,002 INFO L87 Difference]: Start difference. First operand 107 states and 121 transitions. Second operand has 50 states, 50 states have (on average 2.68) internal successors, (134), 49 states have internal predecessors, (134), 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) [2021-11-20 22:51:11,780 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:51:11,780 INFO L93 Difference]: Finished difference Result 185 states and 211 transitions. [2021-11-20 22:51:11,780 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-11-20 22:51:11,781 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 2.68) internal successors, (134), 49 states have internal predecessors, (134), 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 93 [2021-11-20 22:51:11,781 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:51:11,781 INFO L225 Difference]: With dead ends: 185 [2021-11-20 22:51:11,782 INFO L226 Difference]: Without dead ends: 110 [2021-11-20 22:51:11,782 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 334 GetRequests, 249 SyntacticMatches, 3 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 880 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=365, Invalid=6607, Unknown=0, NotChecked=0, Total=6972 [2021-11-20 22:51:11,783 INFO L933 BasicCegarLoop]: 37 mSDtfsCounter, 267 mSDsluCounter, 1183 mSDsCounter, 0 mSdLazyCounter, 2594 mSolverCounterSat, 123 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 267 SdHoareTripleChecker+Valid, 1204 SdHoareTripleChecker+Invalid, 2717 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 123 IncrementalHoareTripleChecker+Valid, 2594 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-20 22:51:11,783 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [267 Valid, 1204 Invalid, 2717 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [123 Valid, 2594 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-20 22:51:11,784 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2021-11-20 22:51:11,785 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 109. [2021-11-20 22:51:11,786 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 109 states, 108 states have (on average 1.1388888888888888) internal successors, (123), 108 states have internal predecessors, (123), 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) [2021-11-20 22:51:11,786 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 123 transitions. [2021-11-20 22:51:11,786 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 123 transitions. Word has length 93 [2021-11-20 22:51:11,787 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:51:11,787 INFO L470 AbstractCegarLoop]: Abstraction has 109 states and 123 transitions. [2021-11-20 22:51:11,787 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 50 states have (on average 2.68) internal successors, (134), 49 states have internal predecessors, (134), 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) [2021-11-20 22:51:11,787 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 123 transitions. [2021-11-20 22:51:11,788 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2021-11-20 22:51:11,788 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:51:11,788 INFO L514 BasicCegarLoop]: trace histogram [13, 13, 13, 13, 13, 13, 13, 1, 1, 1, 1] [2021-11-20 22:51:11,809 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Ended with exit code 0 [2021-11-20 22:51:11,992 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33,28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:51:11,992 INFO L402 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-20 22:51:11,992 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:51:11,993 INFO L85 PathProgramCache]: Analyzing trace with hash 1385042990, now seen corresponding path program 24 times [2021-11-20 22:51:11,993 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:51:11,993 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [40517455] [2021-11-20 22:51:11,993 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:51:11,993 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:51:12,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:51:12,541 INFO L134 CoverageAnalysis]: Checked inductivity of 572 backedges. 121 proven. 451 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:51:12,541 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:51:12,541 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [40517455] [2021-11-20 22:51:12,541 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [40517455] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 22:51:12,541 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1574366363] [2021-11-20 22:51:12,541 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 22:51:12,542 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:51:12,542 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 22:51:12,542 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 22:51:12,553 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2021-11-20 22:51:12,693 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 22:51:12,693 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 22:51:12,696 INFO L263 TraceCheckSpWp]: Trace formula consists of 424 conjuncts, 82 conjunts are in the unsatisfiable core [2021-11-20 22:51:12,698 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:51:12,703 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 [2021-11-20 22:51:13,822 INFO L134 CoverageAnalysis]: Checked inductivity of 572 backedges. 144 proven. 428 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:51:13,822 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:51:15,334 INFO L134 CoverageAnalysis]: Checked inductivity of 572 backedges. 169 proven. 403 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:51:15,334 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1574366363] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:51:15,334 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1622823630] [2021-11-20 22:51:15,335 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 22:51:15,335 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 22:51:15,335 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 22:51:15,336 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 22:51:15,336 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 22:51:15,345 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 [2021-11-20 22:51:15,425 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 23 treesize of output 19 [2021-11-20 22:51:15,533 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:51:15,535 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 144 treesize of output 136 [2021-11-20 22:51:15,765 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 23 treesize of output 19 [2021-11-20 22:51:15,837 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 23 treesize of output 19 [2021-11-20 22:51:16,109 INFO L354 Elim1Store]: treesize reduction 28, result has 33.3 percent of original size [2021-11-20 22:51:16,109 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 139 treesize of output 135 [2021-11-20 22:51:19,134 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 22:51:20,064 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 22:51:20,064 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 22:51:20,064 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 29, 29] total 85 [2021-11-20 22:51:20,064 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [24041888] [2021-11-20 22:51:20,064 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 22:51:20,065 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 87 states [2021-11-20 22:51:20,065 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:51:20,066 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 87 interpolants. [2021-11-20 22:51:20,066 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=953, Invalid=7789, Unknown=0, NotChecked=0, Total=8742 [2021-11-20 22:51:20,067 INFO L87 Difference]: Start difference. First operand 109 states and 123 transitions. Second operand has 87 states, 86 states have (on average 3.2790697674418605) internal successors, (282), 86 states have internal predecessors, (282), 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) [2021-11-20 22:51:21,298 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:51:21,298 INFO L93 Difference]: Finished difference Result 120 states and 136 transitions. [2021-11-20 22:51:21,298 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-11-20 22:51:21,298 INFO L78 Accepts]: Start accepts. Automaton has has 87 states, 86 states have (on average 3.2790697674418605) internal successors, (282), 86 states have internal predecessors, (282), 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 95 [2021-11-20 22:51:21,299 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:51:21,299 INFO L225 Difference]: With dead ends: 120 [2021-11-20 22:51:21,299 INFO L226 Difference]: Without dead ends: 120 [2021-11-20 22:51:21,300 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 327 GetRequests, 218 SyntacticMatches, 1 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3979 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=1805, Invalid=10185, Unknown=0, NotChecked=0, Total=11990 [2021-11-20 22:51:21,300 INFO L933 BasicCegarLoop]: 42 mSDtfsCounter, 629 mSDsluCounter, 903 mSDsCounter, 0 mSdLazyCounter, 2256 mSolverCounterSat, 94 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 629 SdHoareTripleChecker+Valid, 945 SdHoareTripleChecker+Invalid, 2350 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 94 IncrementalHoareTripleChecker+Valid, 2256 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-20 22:51:21,300 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [629 Valid, 945 Invalid, 2350 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [94 Valid, 2256 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-20 22:51:21,301 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2021-11-20 22:51:21,302 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 115. [2021-11-20 22:51:21,303 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 115 states, 114 states have (on average 1.1403508771929824) internal successors, (130), 114 states have internal predecessors, (130), 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) [2021-11-20 22:51:21,303 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 130 transitions. [2021-11-20 22:51:21,304 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 130 transitions. Word has length 95 [2021-11-20 22:51:21,304 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:51:21,304 INFO L470 AbstractCegarLoop]: Abstraction has 115 states and 130 transitions. [2021-11-20 22:51:21,304 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 87 states, 86 states have (on average 3.2790697674418605) internal successors, (282), 86 states have internal predecessors, (282), 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) [2021-11-20 22:51:21,304 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 130 transitions. [2021-11-20 22:51:21,305 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2021-11-20 22:51:21,305 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:51:21,305 INFO L514 BasicCegarLoop]: trace histogram [14, 14, 14, 14, 14, 13, 13, 1, 1, 1, 1] [2021-11-20 22:51:21,335 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Ended with exit code 0 [2021-11-20 22:51:21,525 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2021-11-20 22:51:21,525 INFO L402 AbstractCegarLoop]: === Iteration 36 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-20 22:51:21,525 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:51:21,525 INFO L85 PathProgramCache]: Analyzing trace with hash -2070421482, now seen corresponding path program 25 times [2021-11-20 22:51:21,525 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:51:21,525 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [489509627] [2021-11-20 22:51:21,525 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:51:21,526 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:51:21,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:51:22,145 INFO L134 CoverageAnalysis]: Checked inductivity of 638 backedges. 53 proven. 585 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:51:22,146 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:51:22,146 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [489509627] [2021-11-20 22:51:22,146 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [489509627] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 22:51:22,146 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1651083499] [2021-11-20 22:51:22,146 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 22:51:22,146 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:51:22,146 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 22:51:22,147 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 22:51:22,148 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2021-11-20 22:51:22,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:51:22,235 INFO L263 TraceCheckSpWp]: Trace formula consists of 442 conjuncts, 99 conjunts are in the unsatisfiable core [2021-11-20 22:51:22,236 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:51:22,713 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 21 treesize of output 17 [2021-11-20 22:51:22,942 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2021-11-20 22:51:22,950 INFO L134 CoverageAnalysis]: Checked inductivity of 638 backedges. 53 proven. 585 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:51:22,950 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:51:23,173 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-20 22:51:23,175 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 22 [2021-11-20 22:51:23,395 INFO L134 CoverageAnalysis]: Checked inductivity of 638 backedges. 53 proven. 585 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:51:23,395 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1651083499] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:51:23,395 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1477310759] [2021-11-20 22:51:23,396 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 22:51:23,396 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 22:51:23,396 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 22:51:23,396 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 22:51:23,396 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 22:51:23,408 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 [2021-11-20 22:51:23,500 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 23 treesize of output 19 [2021-11-20 22:51:23,600 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:51:23,600 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 144 treesize of output 136 [2021-11-20 22:51:23,834 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 23 treesize of output 19 [2021-11-20 22:51:23,930 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 23 treesize of output 19 [2021-11-20 22:51:24,177 INFO L354 Elim1Store]: treesize reduction 28, result has 33.3 percent of original size [2021-11-20 22:51:24,177 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 139 treesize of output 135 [2021-11-20 22:51:27,176 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 22:51:28,052 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 22:51:28,052 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 22:51:28,052 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 52 [2021-11-20 22:51:28,052 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1447196738] [2021-11-20 22:51:28,052 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 22:51:28,053 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2021-11-20 22:51:28,053 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:51:28,053 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2021-11-20 22:51:28,053 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=3385, Unknown=0, NotChecked=0, Total=3540 [2021-11-20 22:51:28,053 INFO L87 Difference]: Start difference. First operand 115 states and 130 transitions. Second operand has 53 states, 53 states have (on average 2.69811320754717) internal successors, (143), 52 states have internal predecessors, (143), 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) [2021-11-20 22:51:30,086 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:51:30,086 INFO L93 Difference]: Finished difference Result 280 states and 321 transitions. [2021-11-20 22:51:30,086 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-11-20 22:51:30,087 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 53 states have (on average 2.69811320754717) internal successors, (143), 52 states have internal predecessors, (143), 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 100 [2021-11-20 22:51:30,087 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:51:30,088 INFO L225 Difference]: With dead ends: 280 [2021-11-20 22:51:30,088 INFO L226 Difference]: Without dead ends: 205 [2021-11-20 22:51:30,089 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 359 GetRequests, 269 SyntacticMatches, 3 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 975 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=387, Invalid=7445, Unknown=0, NotChecked=0, Total=7832 [2021-11-20 22:51:30,090 INFO L933 BasicCegarLoop]: 40 mSDtfsCounter, 98 mSDsluCounter, 1449 mSDsCounter, 0 mSdLazyCounter, 3041 mSolverCounterSat, 41 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 98 SdHoareTripleChecker+Valid, 1471 SdHoareTripleChecker+Invalid, 3126 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 41 IncrementalHoareTripleChecker+Valid, 3041 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 44 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2021-11-20 22:51:30,090 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [98 Valid, 1471 Invalid, 3126 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [41 Valid, 3041 Invalid, 0 Unknown, 44 Unchecked, 1.1s Time] [2021-11-20 22:51:30,090 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 205 states. [2021-11-20 22:51:30,093 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 205 to 122. [2021-11-20 22:51:30,093 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 122 states, 121 states have (on average 1.140495867768595) internal successors, (138), 121 states have internal predecessors, (138), 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) [2021-11-20 22:51:30,094 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 138 transitions. [2021-11-20 22:51:30,094 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 138 transitions. Word has length 100 [2021-11-20 22:51:30,094 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:51:30,094 INFO L470 AbstractCegarLoop]: Abstraction has 122 states and 138 transitions. [2021-11-20 22:51:30,095 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 53 states, 53 states have (on average 2.69811320754717) internal successors, (143), 52 states have internal predecessors, (143), 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) [2021-11-20 22:51:30,095 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 138 transitions. [2021-11-20 22:51:30,095 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2021-11-20 22:51:30,095 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:51:30,096 INFO L514 BasicCegarLoop]: trace histogram [14, 14, 14, 14, 13, 13, 13, 1, 1, 1, 1, 1, 1] [2021-11-20 22:51:30,133 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Forceful destruction successful, exit code 0 [2021-11-20 22:51:30,317 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2021-11-20 22:51:30,317 INFO L402 AbstractCegarLoop]: === Iteration 37 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-20 22:51:30,317 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:51:30,317 INFO L85 PathProgramCache]: Analyzing trace with hash 171772811, now seen corresponding path program 4 times [2021-11-20 22:51:30,317 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:51:30,318 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1045621522] [2021-11-20 22:51:30,318 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:51:30,318 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:51:30,350 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:51:30,960 INFO L134 CoverageAnalysis]: Checked inductivity of 638 backedges. 53 proven. 585 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:51:30,960 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:51:30,960 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1045621522] [2021-11-20 22:51:30,960 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1045621522] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 22:51:30,960 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1584746730] [2021-11-20 22:51:30,960 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 22:51:30,961 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:51:30,961 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 22:51:30,961 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 22:51:30,962 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2021-11-20 22:51:31,071 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:51:31,074 INFO L263 TraceCheckSpWp]: Trace formula consists of 450 conjuncts, 100 conjunts are in the unsatisfiable core [2021-11-20 22:51:31,075 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:51:31,557 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 21 treesize of output 17 [2021-11-20 22:51:31,649 INFO L354 Elim1Store]: treesize reduction 26, result has 27.8 percent of original size [2021-11-20 22:51:31,649 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 28 treesize of output 27 [2021-11-20 22:51:31,803 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2021-11-20 22:51:31,810 INFO L134 CoverageAnalysis]: Checked inductivity of 638 backedges. 53 proven. 585 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:51:31,811 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:51:32,020 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-20 22:51:32,021 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 22 [2021-11-20 22:51:32,247 INFO L134 CoverageAnalysis]: Checked inductivity of 638 backedges. 53 proven. 585 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:51:32,247 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1584746730] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:51:32,247 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1089399633] [2021-11-20 22:51:32,248 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-20 22:51:32,248 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 22:51:32,248 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 22:51:32,249 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 22:51:32,249 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 22:51:32,264 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 [2021-11-20 22:51:32,370 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 23 treesize of output 19 [2021-11-20 22:51:32,470 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:51:32,471 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 144 treesize of output 136 [2021-11-20 22:51:32,685 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 23 treesize of output 19 [2021-11-20 22:51:32,771 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 23 treesize of output 19 [2021-11-20 22:51:33,005 INFO L354 Elim1Store]: treesize reduction 28, result has 33.3 percent of original size [2021-11-20 22:51:33,006 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 139 treesize of output 135 [2021-11-20 22:51:35,780 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 11 treesize of output 7 [2021-11-20 22:51:38,345 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 11 treesize of output 7 [2021-11-20 22:51:40,377 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 11 treesize of output 7 [2021-11-20 22:51:42,856 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 11 treesize of output 7 [2021-11-20 22:51:45,873 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 22:51:47,455 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 22:51:47,456 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 22:51:47,456 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 52 [2021-11-20 22:51:47,456 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1345522759] [2021-11-20 22:51:47,456 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 22:51:47,456 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2021-11-20 22:51:47,456 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:51:47,457 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2021-11-20 22:51:47,457 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=164, Invalid=3618, Unknown=0, NotChecked=0, Total=3782 [2021-11-20 22:51:47,457 INFO L87 Difference]: Start difference. First operand 122 states and 138 transitions. Second operand has 53 states, 53 states have (on average 2.7547169811320753) internal successors, (146), 52 states have internal predecessors, (146), 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) [2021-11-20 22:51:49,653 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:51:49,653 INFO L93 Difference]: Finished difference Result 199 states and 226 transitions. [2021-11-20 22:51:49,653 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-11-20 22:51:49,653 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 53 states have (on average 2.7547169811320753) internal successors, (146), 52 states have internal predecessors, (146), 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 101 [2021-11-20 22:51:49,654 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:51:49,654 INFO L225 Difference]: With dead ends: 199 [2021-11-20 22:51:49,654 INFO L226 Difference]: Without dead ends: 118 [2021-11-20 22:51:49,654 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 363 GetRequests, 269 SyntacticMatches, 5 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 1103 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=396, Invalid=7794, Unknown=0, NotChecked=0, Total=8190 [2021-11-20 22:51:49,656 INFO L933 BasicCegarLoop]: 40 mSDtfsCounter, 214 mSDsluCounter, 1511 mSDsCounter, 0 mSdLazyCounter, 3198 mSolverCounterSat, 105 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 214 SdHoareTripleChecker+Valid, 1530 SdHoareTripleChecker+Invalid, 3381 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 105 IncrementalHoareTripleChecker+Valid, 3198 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 78 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2021-11-20 22:51:49,656 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [214 Valid, 1530 Invalid, 3381 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [105 Valid, 3198 Invalid, 0 Unknown, 78 Unchecked, 1.2s Time] [2021-11-20 22:51:49,657 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2021-11-20 22:51:49,659 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 117. [2021-11-20 22:51:49,659 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 117 states, 116 states have (on average 1.1379310344827587) internal successors, (132), 116 states have internal predecessors, (132), 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) [2021-11-20 22:51:49,660 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 132 transitions. [2021-11-20 22:51:49,660 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 132 transitions. Word has length 101 [2021-11-20 22:51:49,660 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:51:49,660 INFO L470 AbstractCegarLoop]: Abstraction has 117 states and 132 transitions. [2021-11-20 22:51:49,660 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 53 states, 53 states have (on average 2.7547169811320753) internal successors, (146), 52 states have internal predecessors, (146), 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) [2021-11-20 22:51:49,661 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 132 transitions. [2021-11-20 22:51:49,661 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2021-11-20 22:51:49,661 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:51:49,661 INFO L514 BasicCegarLoop]: trace histogram [14, 14, 14, 14, 14, 14, 14, 1, 1, 1, 1] [2021-11-20 22:51:49,699 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Forceful destruction successful, exit code 0 [2021-11-20 22:51:49,882 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2021-11-20 22:51:49,882 INFO L402 AbstractCegarLoop]: === Iteration 38 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-20 22:51:49,882 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:51:49,882 INFO L85 PathProgramCache]: Analyzing trace with hash -660731838, now seen corresponding path program 26 times [2021-11-20 22:51:49,882 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:51:49,882 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1955158975] [2021-11-20 22:51:49,882 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:51:49,883 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:51:49,901 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:51:50,497 INFO L134 CoverageAnalysis]: Checked inductivity of 665 backedges. 144 proven. 521 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:51:50,498 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:51:50,498 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1955158975] [2021-11-20 22:51:50,498 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1955158975] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 22:51:50,498 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1897511692] [2021-11-20 22:51:50,498 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 22:51:50,498 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:51:50,498 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 22:51:50,499 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 22:51:50,500 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2021-11-20 22:51:50,742 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2021-11-20 22:51:50,742 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 22:51:50,745 INFO L263 TraceCheckSpWp]: Trace formula consists of 452 conjuncts, 72 conjunts are in the unsatisfiable core [2021-11-20 22:51:50,747 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:51:51,720 INFO L134 CoverageAnalysis]: Checked inductivity of 665 backedges. 169 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:51:51,720 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:51:52,624 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2021-11-20 22:51:52,722 INFO L134 CoverageAnalysis]: Checked inductivity of 665 backedges. 169 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:51:52,722 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1897511692] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:51:52,722 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1812660295] [2021-11-20 22:51:52,723 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 22:51:52,723 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 22:51:52,724 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 22:51:52,724 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 22:51:52,724 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 22:51:52,760 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 [2021-11-20 22:51:52,842 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 [2021-11-20 22:51:52,933 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-20 22:51:52,933 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 138 treesize of output 137 [2021-11-20 22:51:53,224 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 23 treesize of output 19 [2021-11-20 22:51:53,322 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 23 treesize of output 19 [2021-11-20 22:51:53,545 INFO L354 Elim1Store]: treesize reduction 28, result has 33.3 percent of original size [2021-11-20 22:51:53,545 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 139 treesize of output 135 [2021-11-20 22:51:56,663 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 22:51:57,469 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 22:51:57,469 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 22:51:57,469 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 31, 31] total 77 [2021-11-20 22:51:57,469 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1694045373] [2021-11-20 22:51:57,469 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 22:51:57,470 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 79 states [2021-11-20 22:51:57,470 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:51:57,471 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 79 interpolants. [2021-11-20 22:51:57,471 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1017, Invalid=6293, Unknown=0, NotChecked=0, Total=7310 [2021-11-20 22:51:57,471 INFO L87 Difference]: Start difference. First operand 117 states and 132 transitions. Second operand has 79 states, 78 states have (on average 3.5384615384615383) internal successors, (276), 78 states have internal predecessors, (276), 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) [2021-11-20 22:51:58,409 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:51:58,409 INFO L93 Difference]: Finished difference Result 128 states and 145 transitions. [2021-11-20 22:51:58,410 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-11-20 22:51:58,410 INFO L78 Accepts]: Start accepts. Automaton has has 79 states, 78 states have (on average 3.5384615384615383) internal successors, (276), 78 states have internal predecessors, (276), 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 [2021-11-20 22:51:58,410 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:51:58,411 INFO L225 Difference]: With dead ends: 128 [2021-11-20 22:51:58,411 INFO L226 Difference]: Without dead ends: 128 [2021-11-20 22:51:58,411 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 351 GetRequests, 249 SyntacticMatches, 1 SemanticMatches, 101 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3157 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=1858, Invalid=8648, Unknown=0, NotChecked=0, Total=10506 [2021-11-20 22:51:58,412 INFO L933 BasicCegarLoop]: 45 mSDtfsCounter, 746 mSDsluCounter, 549 mSDsCounter, 0 mSdLazyCounter, 1298 mSolverCounterSat, 87 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 746 SdHoareTripleChecker+Valid, 594 SdHoareTripleChecker+Invalid, 1385 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 87 IncrementalHoareTripleChecker+Valid, 1298 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-20 22:51:58,412 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [746 Valid, 594 Invalid, 1385 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [87 Valid, 1298 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-20 22:51:58,412 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2021-11-20 22:51:58,413 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 123. [2021-11-20 22:51:58,413 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 123 states, 122 states have (on average 1.139344262295082) internal successors, (139), 122 states have internal predecessors, (139), 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) [2021-11-20 22:51:58,414 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 139 transitions. [2021-11-20 22:51:58,414 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 139 transitions. Word has length 102 [2021-11-20 22:51:58,414 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:51:58,414 INFO L470 AbstractCegarLoop]: Abstraction has 123 states and 139 transitions. [2021-11-20 22:51:58,414 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 79 states, 78 states have (on average 3.5384615384615383) internal successors, (276), 78 states have internal predecessors, (276), 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) [2021-11-20 22:51:58,414 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 139 transitions. [2021-11-20 22:51:58,415 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2021-11-20 22:51:58,415 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:51:58,415 INFO L514 BasicCegarLoop]: trace histogram [15, 15, 15, 15, 15, 14, 14, 1, 1, 1, 1] [2021-11-20 22:51:58,435 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Forceful destruction successful, exit code 0 [2021-11-20 22:51:58,615 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2021-11-20 22:51:58,615 INFO L402 AbstractCegarLoop]: === Iteration 39 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-20 22:51:58,616 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:51:58,616 INFO L85 PathProgramCache]: Analyzing trace with hash -259958654, now seen corresponding path program 27 times [2021-11-20 22:51:58,616 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:51:58,616 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [255108551] [2021-11-20 22:51:58,616 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:51:58,616 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:51:58,646 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:51:59,454 INFO L134 CoverageAnalysis]: Checked inductivity of 736 backedges. 57 proven. 679 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:51:59,455 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:51:59,455 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [255108551] [2021-11-20 22:51:59,455 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [255108551] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 22:51:59,455 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [429075478] [2021-11-20 22:51:59,455 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 22:51:59,455 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:51:59,455 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 22:51:59,460 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 22:51:59,481 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2021-11-20 22:51:59,724 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 22:51:59,724 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 22:51:59,729 INFO L263 TraceCheckSpWp]: Trace formula consists of 470 conjuncts, 105 conjunts are in the unsatisfiable core [2021-11-20 22:51:59,732 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:52:00,342 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 21 treesize of output 17 [2021-11-20 22:52:00,587 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2021-11-20 22:52:00,595 INFO L134 CoverageAnalysis]: Checked inductivity of 736 backedges. 57 proven. 679 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:52:00,595 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:52:00,789 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-20 22:52:00,790 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 22 [2021-11-20 22:52:01,001 INFO L134 CoverageAnalysis]: Checked inductivity of 736 backedges. 57 proven. 679 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:52:01,001 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [429075478] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:52:01,002 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [190460303] [2021-11-20 22:52:01,002 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 22:52:01,002 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 22:52:01,003 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 22:52:01,003 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 22:52:01,003 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 22:52:01,054 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 [2021-11-20 22:52:01,150 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 [2021-11-20 22:52:01,261 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-20 22:52:01,261 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 138 treesize of output 137 [2021-11-20 22:52:01,587 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 23 treesize of output 19 [2021-11-20 22:52:01,680 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 23 treesize of output 19 [2021-11-20 22:52:01,925 INFO L354 Elim1Store]: treesize reduction 28, result has 33.3 percent of original size [2021-11-20 22:52:01,925 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 139 treesize of output 135 [2021-11-20 22:52:04,878 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 22:52:05,780 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 22:52:05,780 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 22:52:05,781 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34] total 55 [2021-11-20 22:52:05,781 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [786115678] [2021-11-20 22:52:05,781 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 22:52:05,781 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 56 states [2021-11-20 22:52:05,782 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:52:05,782 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2021-11-20 22:52:05,782 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=162, Invalid=3744, Unknown=0, NotChecked=0, Total=3906 [2021-11-20 22:52:05,783 INFO L87 Difference]: Start difference. First operand 123 states and 139 transitions. Second operand has 56 states, 56 states have (on average 2.7142857142857144) internal successors, (152), 55 states have internal predecessors, (152), 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) [2021-11-20 22:52:08,081 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:52:08,081 INFO L93 Difference]: Finished difference Result 213 states and 243 transitions. [2021-11-20 22:52:08,081 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2021-11-20 22:52:08,081 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 56 states have (on average 2.7142857142857144) internal successors, (152), 55 states have internal predecessors, (152), 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 107 [2021-11-20 22:52:08,082 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:52:08,082 INFO L225 Difference]: With dead ends: 213 [2021-11-20 22:52:08,082 INFO L226 Difference]: Without dead ends: 126 [2021-11-20 22:52:08,083 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 384 GetRequests, 289 SyntacticMatches, 3 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 1075 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=409, Invalid=8333, Unknown=0, NotChecked=0, Total=8742 [2021-11-20 22:52:08,083 INFO L933 BasicCegarLoop]: 43 mSDtfsCounter, 311 mSDsluCounter, 1633 mSDsCounter, 0 mSdLazyCounter, 3468 mSolverCounterSat, 144 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 311 SdHoareTripleChecker+Valid, 1657 SdHoareTripleChecker+Invalid, 3669 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 144 IncrementalHoareTripleChecker+Valid, 3468 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 57 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2021-11-20 22:52:08,084 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [311 Valid, 1657 Invalid, 3669 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [144 Valid, 3468 Invalid, 0 Unknown, 57 Unchecked, 1.2s Time] [2021-11-20 22:52:08,084 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2021-11-20 22:52:08,086 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 125. [2021-11-20 22:52:08,086 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 125 states, 124 states have (on average 1.1370967741935485) internal successors, (141), 124 states have internal predecessors, (141), 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) [2021-11-20 22:52:08,087 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 141 transitions. [2021-11-20 22:52:08,087 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 141 transitions. Word has length 107 [2021-11-20 22:52:08,087 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:52:08,087 INFO L470 AbstractCegarLoop]: Abstraction has 125 states and 141 transitions. [2021-11-20 22:52:08,088 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 56 states, 56 states have (on average 2.7142857142857144) internal successors, (152), 55 states have internal predecessors, (152), 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) [2021-11-20 22:52:08,088 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 141 transitions. [2021-11-20 22:52:08,088 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2021-11-20 22:52:08,089 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:52:08,089 INFO L514 BasicCegarLoop]: trace histogram [15, 15, 15, 15, 15, 15, 15, 1, 1, 1, 1] [2021-11-20 22:52:08,117 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Ended with exit code 0 [2021-11-20 22:52:08,304 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2021-11-20 22:52:08,304 INFO L402 AbstractCegarLoop]: === Iteration 40 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-20 22:52:08,304 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:52:08,305 INFO L85 PathProgramCache]: Analyzing trace with hash 863102678, now seen corresponding path program 28 times [2021-11-20 22:52:08,305 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:52:08,305 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [662015781] [2021-11-20 22:52:08,305 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:52:08,305 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:52:08,326 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:52:08,937 INFO L134 CoverageAnalysis]: Checked inductivity of 765 backedges. 169 proven. 596 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:52:08,937 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:52:08,937 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [662015781] [2021-11-20 22:52:08,937 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [662015781] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 22:52:08,937 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1810731313] [2021-11-20 22:52:08,938 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 22:52:08,938 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:52:08,938 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 22:52:08,938 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 22:52:08,940 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2021-11-20 22:52:09,016 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:52:09,019 INFO L263 TraceCheckSpWp]: Trace formula consists of 480 conjuncts, 90 conjunts are in the unsatisfiable core [2021-11-20 22:52:09,021 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:52:09,778 INFO L134 CoverageAnalysis]: Checked inductivity of 765 backedges. 196 proven. 569 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:52:09,778 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:52:10,619 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2021-11-20 22:52:10,699 INFO L134 CoverageAnalysis]: Checked inductivity of 765 backedges. 196 proven. 569 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:52:10,700 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1810731313] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:52:10,700 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1836724656] [2021-11-20 22:52:10,701 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 22:52:10,701 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 22:52:10,701 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 22:52:10,701 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 22:52:10,701 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 22:52:10,735 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 [2021-11-20 22:52:10,808 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 23 treesize of output 19 [2021-11-20 22:52:10,918 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:52:10,919 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 144 treesize of output 136 [2021-11-20 22:52:11,120 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 23 treesize of output 19 [2021-11-20 22:52:11,217 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 23 treesize of output 19 [2021-11-20 22:52:11,480 INFO L354 Elim1Store]: treesize reduction 28, result has 33.3 percent of original size [2021-11-20 22:52:11,480 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 139 treesize of output 135 [2021-11-20 22:52:14,441 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 22:52:15,270 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 22:52:15,270 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 22:52:15,270 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 33, 33] total 67 [2021-11-20 22:52:15,270 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [198706421] [2021-11-20 22:52:15,270 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 22:52:15,271 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 69 states [2021-11-20 22:52:15,271 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:52:15,271 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 69 interpolants. [2021-11-20 22:52:15,272 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=638, Invalid=5062, Unknown=0, NotChecked=0, Total=5700 [2021-11-20 22:52:15,272 INFO L87 Difference]: Start difference. First operand 125 states and 141 transitions. Second operand has 69 states, 68 states have (on average 3.2941176470588234) internal successors, (224), 68 states have internal predecessors, (224), 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) [2021-11-20 22:52:16,556 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:52:16,556 INFO L93 Difference]: Finished difference Result 136 states and 154 transitions. [2021-11-20 22:52:16,556 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-11-20 22:52:16,556 INFO L78 Accepts]: Start accepts. Automaton has has 69 states, 68 states have (on average 3.2941176470588234) internal successors, (224), 68 states have internal predecessors, (224), 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 109 [2021-11-20 22:52:16,556 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:52:16,557 INFO L225 Difference]: With dead ends: 136 [2021-11-20 22:52:16,557 INFO L226 Difference]: Without dead ends: 136 [2021-11-20 22:52:16,558 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 375 GetRequests, 281 SyntacticMatches, 2 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2401 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=1421, Invalid=7321, Unknown=0, NotChecked=0, Total=8742 [2021-11-20 22:52:16,559 INFO L933 BasicCegarLoop]: 48 mSDtfsCounter, 738 mSDsluCounter, 885 mSDsCounter, 0 mSdLazyCounter, 2115 mSolverCounterSat, 93 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 738 SdHoareTripleChecker+Valid, 933 SdHoareTripleChecker+Invalid, 2208 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 93 IncrementalHoareTripleChecker+Valid, 2115 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-20 22:52:16,559 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [738 Valid, 933 Invalid, 2208 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [93 Valid, 2115 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-20 22:52:16,559 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2021-11-20 22:52:16,561 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 131. [2021-11-20 22:52:16,562 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 131 states, 130 states have (on average 1.1384615384615384) internal successors, (148), 130 states have internal predecessors, (148), 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) [2021-11-20 22:52:16,562 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 148 transitions. [2021-11-20 22:52:16,563 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 148 transitions. Word has length 109 [2021-11-20 22:52:16,563 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:52:16,563 INFO L470 AbstractCegarLoop]: Abstraction has 131 states and 148 transitions. [2021-11-20 22:52:16,563 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 69 states, 68 states have (on average 3.2941176470588234) internal successors, (224), 68 states have internal predecessors, (224), 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) [2021-11-20 22:52:16,563 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 148 transitions. [2021-11-20 22:52:16,564 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2021-11-20 22:52:16,564 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:52:16,564 INFO L514 BasicCegarLoop]: trace histogram [16, 16, 16, 16, 16, 15, 15, 1, 1, 1, 1] [2021-11-20 22:52:16,590 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Forceful destruction successful, exit code 0 [2021-11-20 22:52:16,780 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2021-11-20 22:52:16,780 INFO L402 AbstractCegarLoop]: === Iteration 41 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-20 22:52:16,780 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:52:16,781 INFO L85 PathProgramCache]: Analyzing trace with hash 838170222, now seen corresponding path program 29 times [2021-11-20 22:52:16,781 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:52:16,781 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [269973079] [2021-11-20 22:52:16,781 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:52:16,781 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:52:16,810 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:52:17,619 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 61 proven. 780 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:52:17,619 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:52:17,619 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [269973079] [2021-11-20 22:52:17,619 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [269973079] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 22:52:17,619 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1120518747] [2021-11-20 22:52:17,620 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 22:52:17,620 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:52:17,620 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 22:52:17,620 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 22:52:17,621 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2021-11-20 22:52:18,042 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 17 check-sat command(s) [2021-11-20 22:52:18,042 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 22:52:18,047 INFO L263 TraceCheckSpWp]: Trace formula consists of 498 conjuncts, 111 conjunts are in the unsatisfiable core [2021-11-20 22:52:18,049 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:52:18,649 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 21 treesize of output 17 [2021-11-20 22:52:18,969 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2021-11-20 22:52:18,978 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 61 proven. 780 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:52:18,978 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:52:19,227 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-20 22:52:19,229 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 22 [2021-11-20 22:52:19,462 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 61 proven. 780 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:52:19,462 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1120518747] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:52:19,462 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [511375993] [2021-11-20 22:52:19,463 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 22:52:19,463 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 22:52:19,463 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 22:52:19,463 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 22:52:19,463 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 22:52:19,474 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 [2021-11-20 22:52:19,561 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 23 treesize of output 19 [2021-11-20 22:52:19,654 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:52:19,654 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 144 treesize of output 136 [2021-11-20 22:52:19,865 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 23 treesize of output 19 [2021-11-20 22:52:20,015 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 23 treesize of output 19 [2021-11-20 22:52:20,351 INFO L354 Elim1Store]: treesize reduction 28, result has 33.3 percent of original size [2021-11-20 22:52:20,351 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 139 treesize of output 135 [2021-11-20 22:52:23,309 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 22:52:24,224 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 22:52:24,224 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 22:52:24,224 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36, 36] total 58 [2021-11-20 22:52:24,224 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2131562156] [2021-11-20 22:52:24,224 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 22:52:24,225 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 59 states [2021-11-20 22:52:24,225 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:52:24,225 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2021-11-20 22:52:24,225 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=169, Invalid=4121, Unknown=0, NotChecked=0, Total=4290 [2021-11-20 22:52:24,226 INFO L87 Difference]: Start difference. First operand 131 states and 148 transitions. Second operand has 59 states, 59 states have (on average 2.7288135593220337) internal successors, (161), 58 states have internal predecessors, (161), 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) [2021-11-20 22:52:26,798 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:52:26,798 INFO L93 Difference]: Finished difference Result 227 states and 259 transitions. [2021-11-20 22:52:26,798 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2021-11-20 22:52:26,799 INFO L78 Accepts]: Start accepts. Automaton has has 59 states, 59 states have (on average 2.7288135593220337) internal successors, (161), 58 states have internal predecessors, (161), 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 [2021-11-20 22:52:26,799 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:52:26,800 INFO L225 Difference]: With dead ends: 227 [2021-11-20 22:52:26,800 INFO L226 Difference]: Without dead ends: 134 [2021-11-20 22:52:26,801 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 409 GetRequests, 309 SyntacticMatches, 3 SemanticMatches, 97 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 1180 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=431, Invalid=9271, Unknown=0, NotChecked=0, Total=9702 [2021-11-20 22:52:26,801 INFO L933 BasicCegarLoop]: 46 mSDtfsCounter, 250 mSDsluCounter, 1872 mSDsCounter, 0 mSdLazyCounter, 3978 mSolverCounterSat, 122 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 250 SdHoareTripleChecker+Valid, 1894 SdHoareTripleChecker+Invalid, 4145 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 122 IncrementalHoareTripleChecker+Valid, 3978 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 45 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2021-11-20 22:52:26,801 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [250 Valid, 1894 Invalid, 4145 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [122 Valid, 3978 Invalid, 0 Unknown, 45 Unchecked, 1.4s Time] [2021-11-20 22:52:26,802 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 134 states. [2021-11-20 22:52:26,804 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 134 to 133. [2021-11-20 22:52:26,804 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 133 states, 132 states have (on average 1.1363636363636365) internal successors, (150), 132 states have internal predecessors, (150), 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) [2021-11-20 22:52:26,805 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 150 transitions. [2021-11-20 22:52:26,805 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 150 transitions. Word has length 114 [2021-11-20 22:52:26,805 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:52:26,805 INFO L470 AbstractCegarLoop]: Abstraction has 133 states and 150 transitions. [2021-11-20 22:52:26,805 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 59 states, 59 states have (on average 2.7288135593220337) internal successors, (161), 58 states have internal predecessors, (161), 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) [2021-11-20 22:52:26,806 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 150 transitions. [2021-11-20 22:52:26,806 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2021-11-20 22:52:26,806 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:52:26,806 INFO L514 BasicCegarLoop]: trace histogram [16, 16, 16, 16, 16, 16, 16, 1, 1, 1, 1] [2021-11-20 22:52:26,830 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Forceful destruction successful, exit code 0 [2021-11-20 22:52:27,016 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40,35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:52:27,016 INFO L402 AbstractCegarLoop]: === Iteration 42 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-20 22:52:27,016 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:52:27,017 INFO L85 PathProgramCache]: Analyzing trace with hash -1110711910, now seen corresponding path program 30 times [2021-11-20 22:52:27,017 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:52:27,017 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [89057910] [2021-11-20 22:52:27,017 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:52:27,017 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:52:27,046 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:52:27,841 INFO L134 CoverageAnalysis]: Checked inductivity of 872 backedges. 196 proven. 676 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:52:27,841 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:52:27,842 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [89057910] [2021-11-20 22:52:27,842 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [89057910] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 22:52:27,842 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [734666531] [2021-11-20 22:52:27,842 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 22:52:27,842 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:52:27,842 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 22:52:27,843 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 22:52:27,848 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2021-11-20 22:52:28,008 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 22:52:28,008 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 22:52:28,011 INFO L263 TraceCheckSpWp]: Trace formula consists of 508 conjuncts, 101 conjunts are in the unsatisfiable core [2021-11-20 22:52:28,013 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:52:28,020 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 [2021-11-20 22:52:29,086 INFO L134 CoverageAnalysis]: Checked inductivity of 872 backedges. 225 proven. 647 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:52:29,086 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:52:31,215 INFO L134 CoverageAnalysis]: Checked inductivity of 872 backedges. 256 proven. 616 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:52:31,216 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [734666531] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:52:31,216 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1962922062] [2021-11-20 22:52:31,217 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 22:52:31,217 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 22:52:31,217 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 22:52:31,217 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 22:52:31,218 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 22:52:31,254 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 [2021-11-20 22:52:31,333 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 23 treesize of output 19 [2021-11-20 22:52:31,438 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:52:31,440 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 144 treesize of output 136 [2021-11-20 22:52:31,645 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 23 treesize of output 19 [2021-11-20 22:52:31,746 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 23 treesize of output 19 [2021-11-20 22:52:32,009 INFO L354 Elim1Store]: treesize reduction 28, result has 33.3 percent of original size [2021-11-20 22:52:32,009 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 139 treesize of output 135 [2021-11-20 22:52:35,047 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 22:52:36,072 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 22:52:36,072 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 22:52:36,072 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34] total 86 [2021-11-20 22:52:36,073 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1861162252] [2021-11-20 22:52:36,073 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 22:52:36,073 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 88 states [2021-11-20 22:52:36,073 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:52:36,074 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 88 interpolants. [2021-11-20 22:52:36,074 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=942, Invalid=7988, Unknown=0, NotChecked=0, Total=8930 [2021-11-20 22:52:36,075 INFO L87 Difference]: Start difference. First operand 133 states and 150 transitions. Second operand has 88 states, 87 states have (on average 3.632183908045977) internal successors, (316), 87 states have internal predecessors, (316), 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) [2021-11-20 22:52:37,513 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:52:37,514 INFO L93 Difference]: Finished difference Result 144 states and 163 transitions. [2021-11-20 22:52:37,514 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-11-20 22:52:37,514 INFO L78 Accepts]: Start accepts. Automaton has has 88 states, 87 states have (on average 3.632183908045977) internal successors, (316), 87 states have internal predecessors, (316), 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 116 [2021-11-20 22:52:37,514 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:52:37,515 INFO L225 Difference]: With dead ends: 144 [2021-11-20 22:52:37,515 INFO L226 Difference]: Without dead ends: 144 [2021-11-20 22:52:37,516 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 399 GetRequests, 286 SyntacticMatches, 1 SemanticMatches, 112 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3418 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=1867, Invalid=11015, Unknown=0, NotChecked=0, Total=12882 [2021-11-20 22:52:37,517 INFO L933 BasicCegarLoop]: 51 mSDtfsCounter, 904 mSDsluCounter, 1152 mSDsCounter, 0 mSdLazyCounter, 2475 mSolverCounterSat, 129 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 904 SdHoareTripleChecker+Valid, 1203 SdHoareTripleChecker+Invalid, 2604 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 129 IncrementalHoareTripleChecker+Valid, 2475 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-20 22:52:37,517 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [904 Valid, 1203 Invalid, 2604 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [129 Valid, 2475 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-20 22:52:37,518 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 144 states. [2021-11-20 22:52:37,520 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 144 to 139. [2021-11-20 22:52:37,520 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 139 states, 138 states have (on average 1.1376811594202898) internal successors, (157), 138 states have internal predecessors, (157), 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) [2021-11-20 22:52:37,521 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 139 states to 139 states and 157 transitions. [2021-11-20 22:52:37,521 INFO L78 Accepts]: Start accepts. Automaton has 139 states and 157 transitions. Word has length 116 [2021-11-20 22:52:37,521 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:52:37,521 INFO L470 AbstractCegarLoop]: Abstraction has 139 states and 157 transitions. [2021-11-20 22:52:37,522 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 88 states, 87 states have (on average 3.632183908045977) internal successors, (316), 87 states have internal predecessors, (316), 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) [2021-11-20 22:52:37,522 INFO L276 IsEmpty]: Start isEmpty. Operand 139 states and 157 transitions. [2021-11-20 22:52:37,522 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2021-11-20 22:52:37,523 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:52:37,523 INFO L514 BasicCegarLoop]: trace histogram [17, 17, 17, 17, 17, 16, 16, 1, 1, 1, 1] [2021-11-20 22:52:37,548 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Forceful destruction successful, exit code 0 [2021-11-20 22:52:37,732 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41,36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:52:37,732 INFO L402 AbstractCegarLoop]: === Iteration 43 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-20 22:52:37,733 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:52:37,733 INFO L85 PathProgramCache]: Analyzing trace with hash 557684266, now seen corresponding path program 31 times [2021-11-20 22:52:37,733 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:52:37,733 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2099214025] [2021-11-20 22:52:37,733 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:52:37,733 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:52:37,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:52:38,561 INFO L134 CoverageAnalysis]: Checked inductivity of 953 backedges. 65 proven. 888 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:52:38,562 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:52:38,562 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2099214025] [2021-11-20 22:52:38,562 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2099214025] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 22:52:38,562 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [604299829] [2021-11-20 22:52:38,562 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 22:52:38,562 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:52:38,562 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 22:52:38,563 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 22:52:38,564 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process [2021-11-20 22:52:38,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:52:38,656 INFO L263 TraceCheckSpWp]: Trace formula consists of 526 conjuncts, 117 conjunts are in the unsatisfiable core [2021-11-20 22:52:38,659 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:52:39,444 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 21 treesize of output 17 [2021-11-20 22:52:39,715 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2021-11-20 22:52:39,722 INFO L134 CoverageAnalysis]: Checked inductivity of 953 backedges. 65 proven. 888 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:52:39,722 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:52:39,930 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-20 22:52:39,932 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 22 [2021-11-20 22:52:40,165 INFO L134 CoverageAnalysis]: Checked inductivity of 953 backedges. 65 proven. 888 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:52:40,166 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [604299829] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:52:40,166 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1074229945] [2021-11-20 22:52:40,167 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 22:52:40,167 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 22:52:40,167 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 22:52:40,168 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 22:52:40,168 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 22:52:40,224 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 [2021-11-20 22:52:40,286 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 [2021-11-20 22:52:40,422 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-20 22:52:40,422 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 138 treesize of output 137 [2021-11-20 22:52:40,684 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 23 treesize of output 19 [2021-11-20 22:52:40,757 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 23 treesize of output 19 [2021-11-20 22:52:41,037 INFO L354 Elim1Store]: treesize reduction 28, result has 33.3 percent of original size [2021-11-20 22:52:41,037 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 139 treesize of output 135 [2021-11-20 22:52:44,059 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 22:52:45,019 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 22:52:45,019 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 22:52:45,019 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38, 38] total 61 [2021-11-20 22:52:45,019 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [175904706] [2021-11-20 22:52:45,019 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 22:52:45,020 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 62 states [2021-11-20 22:52:45,020 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:52:45,020 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2021-11-20 22:52:45,021 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=176, Invalid=4516, Unknown=0, NotChecked=0, Total=4692 [2021-11-20 22:52:45,021 INFO L87 Difference]: Start difference. First operand 139 states and 157 transitions. Second operand has 62 states, 62 states have (on average 2.7419354838709675) internal successors, (170), 61 states have internal predecessors, (170), 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) [2021-11-20 22:52:47,750 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:52:47,750 INFO L93 Difference]: Finished difference Result 340 states and 390 transitions. [2021-11-20 22:52:47,751 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2021-11-20 22:52:47,751 INFO L78 Accepts]: Start accepts. Automaton has has 62 states, 62 states have (on average 2.7419354838709675) internal successors, (170), 61 states have internal predecessors, (170), 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 121 [2021-11-20 22:52:47,751 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:52:47,752 INFO L225 Difference]: With dead ends: 340 [2021-11-20 22:52:47,752 INFO L226 Difference]: Without dead ends: 247 [2021-11-20 22:52:47,753 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 434 GetRequests, 329 SyntacticMatches, 3 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 1290 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=453, Invalid=10259, Unknown=0, NotChecked=0, Total=10712 [2021-11-20 22:52:47,753 INFO L933 BasicCegarLoop]: 49 mSDtfsCounter, 120 mSDsluCounter, 1966 mSDsCounter, 0 mSdLazyCounter, 4105 mSolverCounterSat, 50 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 120 SdHoareTripleChecker+Valid, 1994 SdHoareTripleChecker+Invalid, 4209 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 50 IncrementalHoareTripleChecker+Valid, 4105 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 54 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2021-11-20 22:52:47,753 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [120 Valid, 1994 Invalid, 4209 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [50 Valid, 4105 Invalid, 0 Unknown, 54 Unchecked, 1.4s Time] [2021-11-20 22:52:47,754 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 247 states. [2021-11-20 22:52:47,757 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 247 to 146. [2021-11-20 22:52:47,757 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 146 states, 145 states have (on average 1.1379310344827587) internal successors, (165), 145 states have internal predecessors, (165), 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) [2021-11-20 22:52:47,758 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 146 states to 146 states and 165 transitions. [2021-11-20 22:52:47,758 INFO L78 Accepts]: Start accepts. Automaton has 146 states and 165 transitions. Word has length 121 [2021-11-20 22:52:47,758 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:52:47,758 INFO L470 AbstractCegarLoop]: Abstraction has 146 states and 165 transitions. [2021-11-20 22:52:47,758 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 62 states, 62 states have (on average 2.7419354838709675) internal successors, (170), 61 states have internal predecessors, (170), 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) [2021-11-20 22:52:47,759 INFO L276 IsEmpty]: Start isEmpty. Operand 146 states and 165 transitions. [2021-11-20 22:52:47,759 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2021-11-20 22:52:47,759 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:52:47,759 INFO L514 BasicCegarLoop]: trace histogram [17, 17, 17, 17, 16, 16, 16, 1, 1, 1, 1, 1, 1] [2021-11-20 22:52:47,797 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Forceful destruction successful, exit code 0 [2021-11-20 22:52:47,972 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable42 [2021-11-20 22:52:47,972 INFO L402 AbstractCegarLoop]: === Iteration 44 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-20 22:52:47,973 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:52:47,973 INFO L85 PathProgramCache]: Analyzing trace with hash -101797475, now seen corresponding path program 5 times [2021-11-20 22:52:47,973 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:52:47,973 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [997544364] [2021-11-20 22:52:47,973 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:52:47,973 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:52:48,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:52:48,869 INFO L134 CoverageAnalysis]: Checked inductivity of 953 backedges. 65 proven. 888 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:52:48,870 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:52:48,870 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [997544364] [2021-11-20 22:52:48,870 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [997544364] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 22:52:48,870 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1572280485] [2021-11-20 22:52:48,870 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 22:52:48,870 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:52:48,870 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 22:52:48,871 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 22:52:48,872 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Waiting until timeout for monitored process [2021-11-20 22:52:49,418 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2021-11-20 22:52:49,418 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 22:52:49,424 INFO L263 TraceCheckSpWp]: Trace formula consists of 534 conjuncts, 118 conjunts are in the unsatisfiable core [2021-11-20 22:52:49,427 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:52:50,082 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 21 treesize of output 17 [2021-11-20 22:52:50,184 INFO L354 Elim1Store]: treesize reduction 26, result has 27.8 percent of original size [2021-11-20 22:52:50,184 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 28 treesize of output 27 [2021-11-20 22:52:50,370 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2021-11-20 22:52:50,378 INFO L134 CoverageAnalysis]: Checked inductivity of 953 backedges. 65 proven. 888 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:52:50,378 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:52:50,653 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-20 22:52:50,654 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 22 [2021-11-20 22:52:50,887 INFO L134 CoverageAnalysis]: Checked inductivity of 953 backedges. 65 proven. 888 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:52:50,887 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1572280485] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:52:50,887 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1990104737] [2021-11-20 22:52:50,888 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-20 22:52:50,889 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 22:52:50,889 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 22:52:50,889 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 22:52:50,889 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 22:52:50,900 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 [2021-11-20 22:52:50,996 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 [2021-11-20 22:52:51,092 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-20 22:52:51,092 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 138 treesize of output 137 [2021-11-20 22:52:51,381 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 23 treesize of output 19 [2021-11-20 22:52:51,451 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 23 treesize of output 19 [2021-11-20 22:52:51,691 INFO L354 Elim1Store]: treesize reduction 28, result has 33.3 percent of original size [2021-11-20 22:52:51,691 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 139 treesize of output 135 [2021-11-20 22:52:54,435 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 11 treesize of output 7 [2021-11-20 22:52:56,769 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 11 treesize of output 7 [2021-11-20 22:52:58,621 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 11 treesize of output 7 [2021-11-20 22:53:00,963 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 11 treesize of output 7 [2021-11-20 22:53:03,884 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 22:53:05,598 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 22:53:05,598 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 22:53:05,598 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38, 38] total 61 [2021-11-20 22:53:05,598 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1317845007] [2021-11-20 22:53:05,598 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 22:53:05,599 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 62 states [2021-11-20 22:53:05,599 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:53:05,599 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2021-11-20 22:53:05,599 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=185, Invalid=4785, Unknown=0, NotChecked=0, Total=4970 [2021-11-20 22:53:05,599 INFO L87 Difference]: Start difference. First operand 146 states and 165 transitions. Second operand has 62 states, 62 states have (on average 2.7903225806451615) internal successors, (173), 61 states have internal predecessors, (173), 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) [2021-11-20 22:53:08,409 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:53:08,409 INFO L93 Difference]: Finished difference Result 241 states and 274 transitions. [2021-11-20 22:53:08,410 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2021-11-20 22:53:08,410 INFO L78 Accepts]: Start accepts. Automaton has has 62 states, 62 states have (on average 2.7903225806451615) internal successors, (173), 61 states have internal predecessors, (173), 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 122 [2021-11-20 22:53:08,410 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:53:08,411 INFO L225 Difference]: With dead ends: 241 [2021-11-20 22:53:08,411 INFO L226 Difference]: Without dead ends: 142 [2021-11-20 22:53:08,411 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 438 GetRequests, 329 SyntacticMatches, 5 SemanticMatches, 104 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 1439 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=462, Invalid=10668, Unknown=0, NotChecked=0, Total=11130 [2021-11-20 22:53:08,412 INFO L933 BasicCegarLoop]: 49 mSDtfsCounter, 426 mSDsluCounter, 2018 mSDsCounter, 0 mSdLazyCounter, 4294 mSolverCounterSat, 194 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 426 SdHoareTripleChecker+Valid, 2046 SdHoareTripleChecker+Invalid, 4488 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 194 IncrementalHoareTripleChecker+Valid, 4294 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.5s IncrementalHoareTripleChecker+Time [2021-11-20 22:53:08,412 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [426 Valid, 2046 Invalid, 4488 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [194 Valid, 4294 Invalid, 0 Unknown, 0 Unchecked, 1.5s Time] [2021-11-20 22:53:08,412 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2021-11-20 22:53:08,414 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 141. [2021-11-20 22:53:08,414 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 141 states, 140 states have (on average 1.1357142857142857) internal successors, (159), 140 states have internal predecessors, (159), 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) [2021-11-20 22:53:08,415 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 159 transitions. [2021-11-20 22:53:08,415 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 159 transitions. Word has length 122 [2021-11-20 22:53:08,415 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:53:08,415 INFO L470 AbstractCegarLoop]: Abstraction has 141 states and 159 transitions. [2021-11-20 22:53:08,416 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 62 states, 62 states have (on average 2.7903225806451615) internal successors, (173), 61 states have internal predecessors, (173), 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) [2021-11-20 22:53:08,416 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 159 transitions. [2021-11-20 22:53:08,416 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2021-11-20 22:53:08,417 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:53:08,417 INFO L514 BasicCegarLoop]: trace histogram [17, 17, 17, 17, 17, 17, 17, 1, 1, 1, 1] [2021-11-20 22:53:08,459 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Forceful destruction successful, exit code 0 [2021-11-20 22:53:08,637 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable43 [2021-11-20 22:53:08,637 INFO L402 AbstractCegarLoop]: === Iteration 45 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-20 22:53:08,638 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:53:08,638 INFO L85 PathProgramCache]: Analyzing trace with hash -1323531906, now seen corresponding path program 32 times [2021-11-20 22:53:08,638 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:53:08,638 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1837570056] [2021-11-20 22:53:08,638 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:53:08,638 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:53:08,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:53:09,396 INFO L134 CoverageAnalysis]: Checked inductivity of 986 backedges. 225 proven. 761 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:53:09,397 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:53:09,397 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1837570056] [2021-11-20 22:53:09,397 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1837570056] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 22:53:09,397 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1279940815] [2021-11-20 22:53:09,397 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 22:53:09,397 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:53:09,397 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 22:53:09,398 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 22:53:09,399 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Waiting until timeout for monitored process [2021-11-20 22:53:09,809 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2021-11-20 22:53:09,809 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 22:53:09,813 INFO L263 TraceCheckSpWp]: Trace formula consists of 536 conjuncts, 84 conjunts are in the unsatisfiable core [2021-11-20 22:53:09,815 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:53:11,054 INFO L134 CoverageAnalysis]: Checked inductivity of 986 backedges. 256 proven. 730 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:53:11,054 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:53:12,233 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2021-11-20 22:53:12,324 INFO L134 CoverageAnalysis]: Checked inductivity of 986 backedges. 256 proven. 730 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:53:12,324 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1279940815] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:53:12,325 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [780988684] [2021-11-20 22:53:12,326 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 22:53:12,326 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 22:53:12,326 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 22:53:12,326 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 22:53:12,326 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 22:53:12,366 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 [2021-11-20 22:53:12,421 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 23 treesize of output 19 [2021-11-20 22:53:12,558 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:53:12,559 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 144 treesize of output 136 [2021-11-20 22:53:12,777 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 23 treesize of output 19 [2021-11-20 22:53:12,880 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 23 treesize of output 19 [2021-11-20 22:53:13,156 INFO L354 Elim1Store]: treesize reduction 28, result has 33.3 percent of original size [2021-11-20 22:53:13,157 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 139 treesize of output 135 [2021-11-20 22:53:16,140 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 22:53:17,018 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 22:53:17,018 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 22:53:17,018 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 37, 37] total 92 [2021-11-20 22:53:17,018 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1418091222] [2021-11-20 22:53:17,018 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 22:53:17,019 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 94 states [2021-11-20 22:53:17,019 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:53:17,019 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 94 interpolants. [2021-11-20 22:53:17,020 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1428, Invalid=8672, Unknown=0, NotChecked=0, Total=10100 [2021-11-20 22:53:17,020 INFO L87 Difference]: Start difference. First operand 141 states and 159 transitions. Second operand has 94 states, 93 states have (on average 3.5806451612903225) internal successors, (333), 93 states have internal predecessors, (333), 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) [2021-11-20 22:53:18,214 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:53:18,214 INFO L93 Difference]: Finished difference Result 152 states and 172 transitions. [2021-11-20 22:53:18,214 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-11-20 22:53:18,214 INFO L78 Accepts]: Start accepts. Automaton has has 94 states, 93 states have (on average 3.5806451612903225) internal successors, (333), 93 states have internal predecessors, (333), 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 123 [2021-11-20 22:53:18,215 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:53:18,216 INFO L225 Difference]: With dead ends: 152 [2021-11-20 22:53:18,216 INFO L226 Difference]: Without dead ends: 152 [2021-11-20 22:53:18,217 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 423 GetRequests, 303 SyntacticMatches, 1 SemanticMatches, 119 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4390 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=2599, Invalid=11921, Unknown=0, NotChecked=0, Total=14520 [2021-11-20 22:53:18,217 INFO L933 BasicCegarLoop]: 54 mSDtfsCounter, 1251 mSDsluCounter, 666 mSDsCounter, 0 mSdLazyCounter, 1468 mSolverCounterSat, 180 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1251 SdHoareTripleChecker+Valid, 720 SdHoareTripleChecker+Invalid, 1648 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 180 IncrementalHoareTripleChecker+Valid, 1468 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-20 22:53:18,218 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1251 Valid, 720 Invalid, 1648 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [180 Valid, 1468 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-20 22:53:18,218 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 152 states. [2021-11-20 22:53:18,220 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 152 to 147. [2021-11-20 22:53:18,220 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 147 states, 146 states have (on average 1.1369863013698631) internal successors, (166), 146 states have internal predecessors, (166), 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) [2021-11-20 22:53:18,221 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147 states to 147 states and 166 transitions. [2021-11-20 22:53:18,221 INFO L78 Accepts]: Start accepts. Automaton has 147 states and 166 transitions. Word has length 123 [2021-11-20 22:53:18,221 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:53:18,221 INFO L470 AbstractCegarLoop]: Abstraction has 147 states and 166 transitions. [2021-11-20 22:53:18,221 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 94 states, 93 states have (on average 3.5806451612903225) internal successors, (333), 93 states have internal predecessors, (333), 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) [2021-11-20 22:53:18,221 INFO L276 IsEmpty]: Start isEmpty. Operand 147 states and 166 transitions. [2021-11-20 22:53:18,222 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2021-11-20 22:53:18,222 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:53:18,222 INFO L514 BasicCegarLoop]: trace histogram [18, 18, 18, 18, 18, 17, 17, 1, 1, 1, 1] [2021-11-20 22:53:18,245 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Forceful destruction successful, exit code 0 [2021-11-20 22:53:18,422 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44,39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:53:18,422 INFO L402 AbstractCegarLoop]: === Iteration 46 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-20 22:53:18,423 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:53:18,423 INFO L85 PathProgramCache]: Analyzing trace with hash -1752611642, now seen corresponding path program 33 times [2021-11-20 22:53:18,423 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:53:18,423 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [124210779] [2021-11-20 22:53:18,423 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:53:18,423 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:53:18,471 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:53:19,399 INFO L134 CoverageAnalysis]: Checked inductivity of 1072 backedges. 69 proven. 1003 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:53:19,399 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:53:19,399 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [124210779] [2021-11-20 22:53:19,399 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [124210779] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 22:53:19,399 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [968784838] [2021-11-20 22:53:19,400 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 22:53:19,400 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:53:19,400 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 22:53:19,401 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 22:53:19,401 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Waiting until timeout for monitored process [2021-11-20 22:53:19,567 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 22:53:19,568 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 22:53:19,571 INFO L263 TraceCheckSpWp]: Trace formula consists of 554 conjuncts, 123 conjunts are in the unsatisfiable core [2021-11-20 22:53:19,574 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:53:20,310 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 21 treesize of output 17 [2021-11-20 22:53:20,648 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2021-11-20 22:53:20,656 INFO L134 CoverageAnalysis]: Checked inductivity of 1072 backedges. 69 proven. 1003 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:53:20,656 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:53:20,877 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-20 22:53:20,878 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 22 [2021-11-20 22:53:21,165 INFO L134 CoverageAnalysis]: Checked inductivity of 1072 backedges. 69 proven. 1003 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:53:21,165 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [968784838] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:53:21,165 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [25571951] [2021-11-20 22:53:21,166 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 22:53:21,166 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 22:53:21,166 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 22:53:21,166 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 22:53:21,166 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 22:53:21,201 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 [2021-11-20 22:53:21,282 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 23 treesize of output 19 [2021-11-20 22:53:21,355 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:53:21,356 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 144 treesize of output 136 [2021-11-20 22:53:21,573 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 23 treesize of output 19 [2021-11-20 22:53:21,665 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 23 treesize of output 19 [2021-11-20 22:53:21,886 INFO L354 Elim1Store]: treesize reduction 28, result has 33.3 percent of original size [2021-11-20 22:53:21,886 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 139 treesize of output 135 [2021-11-20 22:53:24,956 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 22:53:25,944 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 22:53:25,944 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 22:53:25,944 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 40, 40] total 64 [2021-11-20 22:53:25,944 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [956032931] [2021-11-20 22:53:25,944 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 22:53:25,945 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 65 states [2021-11-20 22:53:25,945 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:53:25,945 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2021-11-20 22:53:25,946 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=183, Invalid=4929, Unknown=0, NotChecked=0, Total=5112 [2021-11-20 22:53:25,946 INFO L87 Difference]: Start difference. First operand 147 states and 166 transitions. Second operand has 65 states, 65 states have (on average 2.753846153846154) internal successors, (179), 64 states have internal predecessors, (179), 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) [2021-11-20 22:53:29,276 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:53:29,276 INFO L93 Difference]: Finished difference Result 255 states and 291 transitions. [2021-11-20 22:53:29,276 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2021-11-20 22:53:29,277 INFO L78 Accepts]: Start accepts. Automaton has has 65 states, 65 states have (on average 2.753846153846154) internal successors, (179), 64 states have internal predecessors, (179), 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 128 [2021-11-20 22:53:29,277 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:53:29,277 INFO L225 Difference]: With dead ends: 255 [2021-11-20 22:53:29,278 INFO L226 Difference]: Without dead ends: 150 [2021-11-20 22:53:29,278 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 459 GetRequests, 349 SyntacticMatches, 3 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 1405 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=475, Invalid=11297, Unknown=0, NotChecked=0, Total=11772 [2021-11-20 22:53:29,278 INFO L933 BasicCegarLoop]: 52 mSDtfsCounter, 284 mSDsluCounter, 2552 mSDsCounter, 0 mSdLazyCounter, 5482 mSolverCounterSat, 139 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 284 SdHoareTripleChecker+Valid, 2582 SdHoareTripleChecker+Invalid, 5621 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 139 IncrementalHoareTripleChecker+Valid, 5482 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.9s IncrementalHoareTripleChecker+Time [2021-11-20 22:53:29,279 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [284 Valid, 2582 Invalid, 5621 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [139 Valid, 5482 Invalid, 0 Unknown, 0 Unchecked, 1.9s Time] [2021-11-20 22:53:29,279 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 150 states. [2021-11-20 22:53:29,280 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 150 to 149. [2021-11-20 22:53:29,280 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 149 states, 148 states have (on average 1.135135135135135) internal successors, (168), 148 states have internal predecessors, (168), 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) [2021-11-20 22:53:29,281 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 149 states to 149 states and 168 transitions. [2021-11-20 22:53:29,281 INFO L78 Accepts]: Start accepts. Automaton has 149 states and 168 transitions. Word has length 128 [2021-11-20 22:53:29,281 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:53:29,281 INFO L470 AbstractCegarLoop]: Abstraction has 149 states and 168 transitions. [2021-11-20 22:53:29,281 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 65 states, 65 states have (on average 2.753846153846154) internal successors, (179), 64 states have internal predecessors, (179), 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) [2021-11-20 22:53:29,281 INFO L276 IsEmpty]: Start isEmpty. Operand 149 states and 168 transitions. [2021-11-20 22:53:29,282 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2021-11-20 22:53:29,282 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:53:29,282 INFO L514 BasicCegarLoop]: trace histogram [18, 18, 18, 18, 18, 18, 18, 1, 1, 1, 1] [2021-11-20 22:53:29,320 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Forceful destruction successful, exit code 0 [2021-11-20 22:53:29,496 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45,40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:53:29,496 INFO L402 AbstractCegarLoop]: === Iteration 47 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-20 22:53:29,496 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:53:29,497 INFO L85 PathProgramCache]: Analyzing trace with hash -604065038, now seen corresponding path program 34 times [2021-11-20 22:53:29,497 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:53:29,497 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2128040418] [2021-11-20 22:53:29,497 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:53:29,497 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:53:29,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:53:30,379 INFO L134 CoverageAnalysis]: Checked inductivity of 1107 backedges. 256 proven. 851 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:53:30,379 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:53:30,380 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2128040418] [2021-11-20 22:53:30,380 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2128040418] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 22:53:30,380 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [505336673] [2021-11-20 22:53:30,380 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 22:53:30,380 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:53:30,380 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 22:53:30,388 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 22:53:30,412 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Waiting until timeout for monitored process [2021-11-20 22:53:30,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:53:30,490 INFO L263 TraceCheckSpWp]: Trace formula consists of 564 conjuncts, 105 conjunts are in the unsatisfiable core [2021-11-20 22:53:30,491 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:53:31,490 INFO L134 CoverageAnalysis]: Checked inductivity of 1107 backedges. 289 proven. 818 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:53:31,490 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:53:32,563 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2021-11-20 22:53:32,667 INFO L134 CoverageAnalysis]: Checked inductivity of 1107 backedges. 289 proven. 818 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:53:32,667 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [505336673] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:53:32,668 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1597962836] [2021-11-20 22:53:32,668 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 22:53:32,669 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 22:53:32,669 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 22:53:32,669 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 22:53:32,669 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 22:53:32,689 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 [2021-11-20 22:53:32,782 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 23 treesize of output 19 [2021-11-20 22:53:32,873 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:53:32,873 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 144 treesize of output 136 [2021-11-20 22:53:33,109 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 23 treesize of output 19 [2021-11-20 22:53:33,207 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 23 treesize of output 19 [2021-11-20 22:53:33,434 INFO L354 Elim1Store]: treesize reduction 28, result has 33.3 percent of original size [2021-11-20 22:53:33,434 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 139 treesize of output 135 [2021-11-20 22:53:36,424 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 22:53:37,325 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 22:53:37,325 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 22:53:37,325 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 39, 39] total 79 [2021-11-20 22:53:37,325 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [581144716] [2021-11-20 22:53:37,325 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 22:53:37,326 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 81 states [2021-11-20 22:53:37,326 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:53:37,326 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 81 interpolants. [2021-11-20 22:53:37,326 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=863, Invalid=6793, Unknown=0, NotChecked=0, Total=7656 [2021-11-20 22:53:37,326 INFO L87 Difference]: Start difference. First operand 149 states and 168 transitions. Second operand has 81 states, 80 states have (on average 3.325) internal successors, (266), 80 states have internal predecessors, (266), 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) [2021-11-20 22:53:39,045 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:53:39,045 INFO L93 Difference]: Finished difference Result 160 states and 181 transitions. [2021-11-20 22:53:39,045 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-11-20 22:53:39,045 INFO L78 Accepts]: Start accepts. Automaton has has 81 states, 80 states have (on average 3.325) internal successors, (266), 80 states have internal predecessors, (266), 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 130 [2021-11-20 22:53:39,046 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:53:39,046 INFO L225 Difference]: With dead ends: 160 [2021-11-20 22:53:39,046 INFO L226 Difference]: Without dead ends: 160 [2021-11-20 22:53:39,047 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 447 GetRequests, 338 SyntacticMatches, 2 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3253 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=1934, Invalid=9838, Unknown=0, NotChecked=0, Total=11772 [2021-11-20 22:53:39,048 INFO L933 BasicCegarLoop]: 57 mSDtfsCounter, 657 mSDsluCounter, 1185 mSDsCounter, 0 mSdLazyCounter, 2903 mSolverCounterSat, 80 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 657 SdHoareTripleChecker+Valid, 1242 SdHoareTripleChecker+Invalid, 2983 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 80 IncrementalHoareTripleChecker+Valid, 2903 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2021-11-20 22:53:39,048 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [657 Valid, 1242 Invalid, 2983 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [80 Valid, 2903 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2021-11-20 22:53:39,049 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2021-11-20 22:53:39,051 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 155. [2021-11-20 22:53:39,051 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 155 states, 154 states have (on average 1.1363636363636365) internal successors, (175), 154 states have internal predecessors, (175), 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) [2021-11-20 22:53:39,052 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 155 states to 155 states and 175 transitions. [2021-11-20 22:53:39,052 INFO L78 Accepts]: Start accepts. Automaton has 155 states and 175 transitions. Word has length 130 [2021-11-20 22:53:39,052 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:53:39,052 INFO L470 AbstractCegarLoop]: Abstraction has 155 states and 175 transitions. [2021-11-20 22:53:39,052 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 81 states, 80 states have (on average 3.325) internal successors, (266), 80 states have internal predecessors, (266), 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) [2021-11-20 22:53:39,053 INFO L276 IsEmpty]: Start isEmpty. Operand 155 states and 175 transitions. [2021-11-20 22:53:39,053 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2021-11-20 22:53:39,053 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:53:39,054 INFO L514 BasicCegarLoop]: trace histogram [19, 19, 19, 19, 19, 18, 18, 1, 1, 1, 1] [2021-11-20 22:53:39,085 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Forceful destruction successful, exit code 0 [2021-11-20 22:53:39,280 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable46 [2021-11-20 22:53:39,280 INFO L402 AbstractCegarLoop]: === Iteration 48 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-20 22:53:39,281 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:53:39,281 INFO L85 PathProgramCache]: Analyzing trace with hash 1297079250, now seen corresponding path program 35 times [2021-11-20 22:53:39,281 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:53:39,281 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1617938286] [2021-11-20 22:53:39,281 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:53:39,281 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:53:39,321 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:53:40,315 INFO L134 CoverageAnalysis]: Checked inductivity of 1198 backedges. 73 proven. 1125 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:53:40,315 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:53:40,315 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1617938286] [2021-11-20 22:53:40,315 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1617938286] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 22:53:40,316 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [234134831] [2021-11-20 22:53:40,316 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 22:53:40,316 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:53:40,316 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 22:53:40,317 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 22:53:40,317 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Waiting until timeout for monitored process [2021-11-20 22:53:40,807 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 20 check-sat command(s) [2021-11-20 22:53:40,807 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 22:53:40,812 INFO L263 TraceCheckSpWp]: Trace formula consists of 582 conjuncts, 59 conjunts are in the unsatisfiable core [2021-11-20 22:53:40,814 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:53:40,819 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 [2021-11-20 22:53:41,014 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 23 treesize of output 19 [2021-11-20 22:53:41,767 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-20 22:53:41,768 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 26 treesize of output 26 [2021-11-20 22:53:41,959 INFO L134 CoverageAnalysis]: Checked inductivity of 1198 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 1107 trivial. 0 not checked. [2021-11-20 22:53:41,959 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:53:43,287 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 29 [2021-11-20 22:53:43,289 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 37 treesize of output 35 [2021-11-20 22:53:43,499 INFO L134 CoverageAnalysis]: Checked inductivity of 1198 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 1107 trivial. 0 not checked. [2021-11-20 22:53:43,499 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [234134831] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:53:43,499 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1114499513] [2021-11-20 22:53:43,500 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 22:53:43,501 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 22:53:43,501 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 22:53:43,501 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 22:53:43,501 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 22:53:43,540 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 [2021-11-20 22:53:43,598 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 23 treesize of output 19 [2021-11-20 22:53:43,698 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:53:43,699 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 144 treesize of output 136 [2021-11-20 22:53:43,920 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 23 treesize of output 19 [2021-11-20 22:53:44,031 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 23 treesize of output 19 [2021-11-20 22:53:44,287 INFO L354 Elim1Store]: treesize reduction 28, result has 33.3 percent of original size [2021-11-20 22:53:44,287 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 139 treesize of output 135 [2021-11-20 22:53:47,342 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 22:53:48,288 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 22:53:48,288 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 22:53:48,289 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 6, 6] total 54 [2021-11-20 22:53:48,289 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [38048586] [2021-11-20 22:53:48,289 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 22:53:48,290 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2021-11-20 22:53:48,290 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:53:48,290 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2021-11-20 22:53:48,290 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=151, Invalid=3631, Unknown=0, NotChecked=0, Total=3782 [2021-11-20 22:53:48,291 INFO L87 Difference]: Start difference. First operand 155 states and 175 transitions. Second operand has 55 states, 55 states have (on average 3.036363636363636) internal successors, (167), 54 states have internal predecessors, (167), 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) [2021-11-20 22:53:52,956 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:53:52,957 INFO L93 Difference]: Finished difference Result 379 states and 435 transitions. [2021-11-20 22:53:52,957 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 104 states. [2021-11-20 22:53:52,957 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 55 states have (on average 3.036363636363636) internal successors, (167), 54 states have internal predecessors, (167), 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 135 [2021-11-20 22:53:52,957 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:53:52,959 INFO L225 Difference]: With dead ends: 379 [2021-11-20 22:53:52,959 INFO L226 Difference]: Without dead ends: 376 [2021-11-20 22:53:52,960 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 564 GetRequests, 404 SyntacticMatches, 0 SemanticMatches, 160 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5457 ImplicationChecksByTransitivity, 6.3s TimeCoverageRelationStatistics Valid=1146, Invalid=24936, Unknown=0, NotChecked=0, Total=26082 [2021-11-20 22:53:52,961 INFO L933 BasicCegarLoop]: 37 mSDtfsCounter, 47 mSDsluCounter, 1564 mSDsCounter, 0 mSdLazyCounter, 1784 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 47 SdHoareTripleChecker+Valid, 1582 SdHoareTripleChecker+Invalid, 1838 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 1784 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 47 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-20 22:53:52,961 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [47 Valid, 1582 Invalid, 1838 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 1784 Invalid, 0 Unknown, 47 Unchecked, 0.7s Time] [2021-11-20 22:53:52,962 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 376 states. [2021-11-20 22:53:52,966 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 376 to 337. [2021-11-20 22:53:52,967 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 337 states, 336 states have (on average 1.1696428571428572) internal successors, (393), 336 states have internal predecessors, (393), 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) [2021-11-20 22:53:52,967 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 337 states to 337 states and 393 transitions. [2021-11-20 22:53:52,968 INFO L78 Accepts]: Start accepts. Automaton has 337 states and 393 transitions. Word has length 135 [2021-11-20 22:53:52,968 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:53:52,968 INFO L470 AbstractCegarLoop]: Abstraction has 337 states and 393 transitions. [2021-11-20 22:53:52,968 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 55 states, 55 states have (on average 3.036363636363636) internal successors, (167), 54 states have internal predecessors, (167), 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) [2021-11-20 22:53:52,968 INFO L276 IsEmpty]: Start isEmpty. Operand 337 states and 393 transitions. [2021-11-20 22:53:52,969 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2021-11-20 22:53:52,970 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:53:52,970 INFO L514 BasicCegarLoop]: trace histogram [19, 19, 19, 19, 18, 18, 18, 1, 1, 1, 1, 1, 1] [2021-11-20 22:53:52,997 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Forceful destruction successful, exit code 0 [2021-11-20 22:53:53,188 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable47 [2021-11-20 22:53:53,188 INFO L402 AbstractCegarLoop]: === Iteration 49 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-20 22:53:53,188 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:53:53,189 INFO L85 PathProgramCache]: Analyzing trace with hash 1413134645, now seen corresponding path program 6 times [2021-11-20 22:53:53,189 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:53:53,189 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [28638299] [2021-11-20 22:53:53,189 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:53:53,189 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:53:53,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:53:54,390 INFO L134 CoverageAnalysis]: Checked inductivity of 1198 backedges. 73 proven. 1125 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:53:54,390 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:53:54,390 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [28638299] [2021-11-20 22:53:54,391 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [28638299] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 22:53:54,391 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [592159398] [2021-11-20 22:53:54,391 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 22:53:54,391 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:53:54,391 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 22:53:54,392 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 22:53:54,415 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Waiting until timeout for monitored process [2021-11-20 22:53:54,692 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 22:53:54,693 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 22:53:54,697 INFO L263 TraceCheckSpWp]: Trace formula consists of 590 conjuncts, 130 conjunts are in the unsatisfiable core [2021-11-20 22:53:54,699 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:53:55,480 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 21 treesize of output 17 [2021-11-20 22:53:55,587 INFO L354 Elim1Store]: treesize reduction 26, result has 27.8 percent of original size [2021-11-20 22:53:55,587 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 28 treesize of output 27 [2021-11-20 22:53:55,812 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2021-11-20 22:53:55,819 INFO L134 CoverageAnalysis]: Checked inductivity of 1198 backedges. 73 proven. 1125 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:53:55,819 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:53:56,118 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-20 22:53:56,120 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 22 [2021-11-20 22:53:56,376 INFO L134 CoverageAnalysis]: Checked inductivity of 1198 backedges. 73 proven. 1125 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:53:56,377 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [592159398] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:53:56,377 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [194257762] [2021-11-20 22:53:56,377 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-20 22:53:56,378 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 22:53:56,378 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 22:53:56,378 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 22:53:56,378 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 22:53:56,435 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 [2021-11-20 22:53:56,530 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 [2021-11-20 22:53:56,631 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-20 22:53:56,632 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 138 treesize of output 137 [2021-11-20 22:53:56,916 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 23 treesize of output 19 [2021-11-20 22:53:56,996 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 23 treesize of output 19 [2021-11-20 22:53:57,276 INFO L354 Elim1Store]: treesize reduction 28, result has 33.3 percent of original size [2021-11-20 22:53:57,276 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 139 treesize of output 135 [2021-11-20 22:54:00,004 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 11 treesize of output 7 [2021-11-20 22:54:02,291 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 11 treesize of output 7 [2021-11-20 22:54:04,076 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 11 treesize of output 7 [2021-11-20 22:54:06,497 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 11 treesize of output 7 [2021-11-20 22:54:09,412 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 22:54:11,237 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 22:54:11,237 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 22:54:11,237 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 42, 42] total 67 [2021-11-20 22:54:11,237 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1442142511] [2021-11-20 22:54:11,237 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 22:54:11,238 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 68 states [2021-11-20 22:54:11,238 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:54:11,238 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2021-11-20 22:54:11,238 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=199, Invalid=5653, Unknown=0, NotChecked=0, Total=5852 [2021-11-20 22:54:11,238 INFO L87 Difference]: Start difference. First operand 337 states and 393 transitions. Second operand has 68 states, 68 states have (on average 2.8088235294117645) internal successors, (191), 67 states have internal predecessors, (191), 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) [2021-11-20 22:54:14,694 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:54:14,694 INFO L93 Difference]: Finished difference Result 444 states and 516 transitions. [2021-11-20 22:54:14,695 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2021-11-20 22:54:14,695 INFO L78 Accepts]: Start accepts. Automaton has has 68 states, 68 states have (on average 2.8088235294117645) internal successors, (191), 67 states have internal predecessors, (191), 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 136 [2021-11-20 22:54:14,695 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:54:14,696 INFO L225 Difference]: With dead ends: 444 [2021-11-20 22:54:14,696 INFO L226 Difference]: Without dead ends: 248 [2021-11-20 22:54:14,696 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 488 GetRequests, 369 SyntacticMatches, 5 SemanticMatches, 114 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 1688 ImplicationChecksByTransitivity, 5.4s TimeCoverageRelationStatistics Valid=506, Invalid=12834, Unknown=0, NotChecked=0, Total=13340 [2021-11-20 22:54:14,697 INFO L933 BasicCegarLoop]: 55 mSDtfsCounter, 207 mSDsluCounter, 2541 mSDsCounter, 0 mSdLazyCounter, 5497 mSolverCounterSat, 109 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 207 SdHoareTripleChecker+Valid, 2573 SdHoareTripleChecker+Invalid, 5606 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 109 IncrementalHoareTripleChecker+Valid, 5497 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.9s IncrementalHoareTripleChecker+Time [2021-11-20 22:54:14,697 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [207 Valid, 2573 Invalid, 5606 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [109 Valid, 5497 Invalid, 0 Unknown, 0 Unchecked, 1.9s Time] [2021-11-20 22:54:14,697 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 248 states. [2021-11-20 22:54:14,700 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 248 to 247. [2021-11-20 22:54:14,701 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 247 states, 246 states have (on average 1.1585365853658536) internal successors, (285), 246 states have internal predecessors, (285), 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) [2021-11-20 22:54:14,701 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 247 states to 247 states and 285 transitions. [2021-11-20 22:54:14,701 INFO L78 Accepts]: Start accepts. Automaton has 247 states and 285 transitions. Word has length 136 [2021-11-20 22:54:14,702 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:54:14,702 INFO L470 AbstractCegarLoop]: Abstraction has 247 states and 285 transitions. [2021-11-20 22:54:14,702 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 68 states, 68 states have (on average 2.8088235294117645) internal successors, (191), 67 states have internal predecessors, (191), 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) [2021-11-20 22:54:14,702 INFO L276 IsEmpty]: Start isEmpty. Operand 247 states and 285 transitions. [2021-11-20 22:54:14,703 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 139 [2021-11-20 22:54:14,703 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:54:14,703 INFO L514 BasicCegarLoop]: trace histogram [19, 19, 19, 19, 19, 19, 18, 1, 1, 1, 1, 1, 1] [2021-11-20 22:54:14,736 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Ended with exit code 0 [2021-11-20 22:54:14,916 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable48 [2021-11-20 22:54:14,916 INFO L402 AbstractCegarLoop]: === Iteration 50 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-20 22:54:14,916 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:54:14,917 INFO L85 PathProgramCache]: Analyzing trace with hash 925186913, now seen corresponding path program 7 times [2021-11-20 22:54:14,917 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:54:14,917 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1072259553] [2021-11-20 22:54:14,917 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:54:14,917 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:54:14,946 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:54:15,818 INFO L134 CoverageAnalysis]: Checked inductivity of 1235 backedges. 289 proven. 946 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:54:15,819 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:54:15,819 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1072259553] [2021-11-20 22:54:15,819 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1072259553] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 22:54:15,819 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [747850205] [2021-11-20 22:54:15,819 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 22:54:15,819 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:54:15,819 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 22:54:15,820 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 22:54:15,821 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Waiting until timeout for monitored process [2021-11-20 22:54:15,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:54:15,913 INFO L263 TraceCheckSpWp]: Trace formula consists of 600 conjuncts, 110 conjunts are in the unsatisfiable core [2021-11-20 22:54:15,915 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:54:16,967 INFO L134 CoverageAnalysis]: Checked inductivity of 1235 backedges. 324 proven. 911 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:54:16,967 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:54:18,143 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2021-11-20 22:54:18,265 INFO L134 CoverageAnalysis]: Checked inductivity of 1235 backedges. 324 proven. 911 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:54:18,265 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [747850205] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:54:18,265 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1724395531] [2021-11-20 22:54:18,266 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-20 22:54:18,266 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 22:54:18,266 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 22:54:18,266 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 22:54:18,266 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 22:54:18,304 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 [2021-11-20 22:54:18,400 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 [2021-11-20 22:54:18,495 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-20 22:54:18,495 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 138 treesize of output 137 [2021-11-20 22:54:18,755 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 23 treesize of output 19 [2021-11-20 22:54:18,845 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 23 treesize of output 19 [2021-11-20 22:54:19,078 INFO L354 Elim1Store]: treesize reduction 28, result has 33.3 percent of original size [2021-11-20 22:54:19,079 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 139 treesize of output 135 [2021-11-20 22:54:21,936 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 11 treesize of output 7 [2021-11-20 22:54:24,499 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 11 treesize of output 7 [2021-11-20 22:54:26,364 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 11 treesize of output 7 [2021-11-20 22:54:28,956 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 11 treesize of output 7 [2021-11-20 22:54:32,087 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 22:54:33,751 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 22:54:33,751 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 22:54:33,751 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 41, 41] total 83 [2021-11-20 22:54:33,751 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [236139778] [2021-11-20 22:54:33,752 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 22:54:33,752 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 85 states [2021-11-20 22:54:33,752 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:54:33,752 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 85 interpolants. [2021-11-20 22:54:33,753 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=957, Invalid=7785, Unknown=0, NotChecked=0, Total=8742 [2021-11-20 22:54:33,753 INFO L87 Difference]: Start difference. First operand 247 states and 285 transitions. Second operand has 85 states, 84 states have (on average 3.369047619047619) internal successors, (283), 84 states have internal predecessors, (283), 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) [2021-11-20 22:54:35,581 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:54:35,581 INFO L93 Difference]: Finished difference Result 269 states and 311 transitions. [2021-11-20 22:54:35,582 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-11-20 22:54:35,582 INFO L78 Accepts]: Start accepts. Automaton has has 85 states, 84 states have (on average 3.369047619047619) internal successors, (283), 84 states have internal predecessors, (283), 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 138 [2021-11-20 22:54:35,582 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:54:35,583 INFO L225 Difference]: With dead ends: 269 [2021-11-20 22:54:35,583 INFO L226 Difference]: Without dead ends: 269 [2021-11-20 22:54:35,584 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 474 GetRequests, 358 SyntacticMatches, 2 SemanticMatches, 114 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3773 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=2134, Invalid=11206, Unknown=0, NotChecked=0, Total=13340 [2021-11-20 22:54:35,584 INFO L933 BasicCegarLoop]: 60 mSDtfsCounter, 1087 mSDsluCounter, 1320 mSDsCounter, 0 mSdLazyCounter, 3084 mSolverCounterSat, 120 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1087 SdHoareTripleChecker+Valid, 1380 SdHoareTripleChecker+Invalid, 3204 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 120 IncrementalHoareTripleChecker+Valid, 3084 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2021-11-20 22:54:35,585 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1087 Valid, 1380 Invalid, 3204 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [120 Valid, 3084 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2021-11-20 22:54:35,585 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 269 states. [2021-11-20 22:54:35,587 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 269 to 258. [2021-11-20 22:54:35,587 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 258 states, 257 states have (on average 1.1595330739299612) internal successors, (298), 257 states have internal predecessors, (298), 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) [2021-11-20 22:54:35,587 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 258 states to 258 states and 298 transitions. [2021-11-20 22:54:35,587 INFO L78 Accepts]: Start accepts. Automaton has 258 states and 298 transitions. Word has length 138 [2021-11-20 22:54:35,588 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:54:35,588 INFO L470 AbstractCegarLoop]: Abstraction has 258 states and 298 transitions. [2021-11-20 22:54:35,588 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 85 states, 84 states have (on average 3.369047619047619) internal successors, (283), 84 states have internal predecessors, (283), 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) [2021-11-20 22:54:35,588 INFO L276 IsEmpty]: Start isEmpty. Operand 258 states and 298 transitions. [2021-11-20 22:54:35,588 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2021-11-20 22:54:35,589 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:54:35,589 INFO L514 BasicCegarLoop]: trace histogram [20, 20, 20, 20, 19, 19, 19, 1, 1, 1, 1, 1, 1] [2021-11-20 22:54:35,608 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Ended with exit code 0 [2021-11-20 22:54:35,789 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable49 [2021-11-20 22:54:35,789 INFO L402 AbstractCegarLoop]: === Iteration 51 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-20 22:54:35,789 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:54:35,790 INFO L85 PathProgramCache]: Analyzing trace with hash -899137341, now seen corresponding path program 8 times [2021-11-20 22:54:35,790 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:54:35,790 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [110573443] [2021-11-20 22:54:35,790 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:54:35,790 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:54:35,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:54:37,010 INFO L134 CoverageAnalysis]: Checked inductivity of 1331 backedges. 77 proven. 1254 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:54:37,010 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:54:37,010 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [110573443] [2021-11-20 22:54:37,010 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [110573443] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 22:54:37,010 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2028102736] [2021-11-20 22:54:37,010 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 22:54:37,010 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:54:37,011 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 22:54:37,011 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 22:54:37,012 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Waiting until timeout for monitored process [2021-11-20 22:54:37,832 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 21 check-sat command(s) [2021-11-20 22:54:37,832 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 22:54:37,838 INFO L263 TraceCheckSpWp]: Trace formula consists of 618 conjuncts, 136 conjunts are in the unsatisfiable core [2021-11-20 22:54:37,841 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:54:38,731 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 21 treesize of output 17 [2021-11-20 22:54:38,843 INFO L354 Elim1Store]: treesize reduction 26, result has 27.8 percent of original size [2021-11-20 22:54:38,843 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 28 treesize of output 27 [2021-11-20 22:54:39,069 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2021-11-20 22:54:39,077 INFO L134 CoverageAnalysis]: Checked inductivity of 1331 backedges. 77 proven. 1254 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:54:39,077 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:54:39,386 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-20 22:54:39,388 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 22 [2021-11-20 22:54:39,657 INFO L134 CoverageAnalysis]: Checked inductivity of 1331 backedges. 77 proven. 1254 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:54:39,657 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2028102736] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:54:39,657 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [620722757] [2021-11-20 22:54:39,658 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-20 22:54:39,658 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 22:54:39,659 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 22:54:39,659 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 22:54:39,659 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 22:54:39,701 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 [2021-11-20 22:54:39,779 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 [2021-11-20 22:54:39,864 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-20 22:54:39,864 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 138 treesize of output 137 [2021-11-20 22:54:40,146 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 23 treesize of output 19 [2021-11-20 22:54:40,252 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 23 treesize of output 19 [2021-11-20 22:54:40,530 INFO L354 Elim1Store]: treesize reduction 28, result has 33.3 percent of original size [2021-11-20 22:54:40,530 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 139 treesize of output 135 [2021-11-20 22:54:43,372 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 11 treesize of output 7 [2021-11-20 22:54:46,092 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 11 treesize of output 7 [2021-11-20 22:54:48,098 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 11 treesize of output 7 [2021-11-20 22:54:50,892 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 11 treesize of output 7 [2021-11-20 22:54:54,198 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 22:54:56,064 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 22:54:56,064 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 22:54:56,064 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 44, 44] total 70 [2021-11-20 22:54:56,065 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [300931407] [2021-11-20 22:54:56,065 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 22:54:56,065 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 71 states [2021-11-20 22:54:56,065 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:54:56,065 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2021-11-20 22:54:56,066 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=206, Invalid=6114, Unknown=0, NotChecked=0, Total=6320 [2021-11-20 22:54:56,066 INFO L87 Difference]: Start difference. First operand 258 states and 298 transitions. Second operand has 71 states, 71 states have (on average 2.816901408450704) internal successors, (200), 70 states have internal predecessors, (200), 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) [2021-11-20 22:55:00,032 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:55:00,032 INFO L93 Difference]: Finished difference Result 471 states and 547 transitions. [2021-11-20 22:55:00,033 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2021-11-20 22:55:00,033 INFO L78 Accepts]: Start accepts. Automaton has has 71 states, 71 states have (on average 2.816901408450704) internal successors, (200), 70 states have internal predecessors, (200), 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 143 [2021-11-20 22:55:00,033 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:55:00,034 INFO L225 Difference]: With dead ends: 471 [2021-11-20 22:55:00,034 INFO L226 Difference]: Without dead ends: 261 [2021-11-20 22:55:00,035 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 513 GetRequests, 389 SyntacticMatches, 5 SemanticMatches, 119 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 1820 ImplicationChecksByTransitivity, 5.7s TimeCoverageRelationStatistics Valid=528, Invalid=13992, Unknown=0, NotChecked=0, Total=14520 [2021-11-20 22:55:00,035 INFO L933 BasicCegarLoop]: 58 mSDtfsCounter, 316 mSDsluCounter, 3016 mSDsCounter, 0 mSdLazyCounter, 6416 mSolverCounterSat, 154 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 316 SdHoareTripleChecker+Valid, 3050 SdHoareTripleChecker+Invalid, 6570 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 154 IncrementalHoareTripleChecker+Valid, 6416 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.2s IncrementalHoareTripleChecker+Time [2021-11-20 22:55:00,036 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [316 Valid, 3050 Invalid, 6570 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [154 Valid, 6416 Invalid, 0 Unknown, 0 Unchecked, 2.2s Time] [2021-11-20 22:55:00,036 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 261 states. [2021-11-20 22:55:00,039 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 261 to 260. [2021-11-20 22:55:00,039 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 260 states, 259 states have (on average 1.1583011583011582) internal successors, (300), 259 states have internal predecessors, (300), 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) [2021-11-20 22:55:00,040 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 260 states to 260 states and 300 transitions. [2021-11-20 22:55:00,040 INFO L78 Accepts]: Start accepts. Automaton has 260 states and 300 transitions. Word has length 143 [2021-11-20 22:55:00,040 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:55:00,040 INFO L470 AbstractCegarLoop]: Abstraction has 260 states and 300 transitions. [2021-11-20 22:55:00,040 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 71 states, 71 states have (on average 2.816901408450704) internal successors, (200), 70 states have internal predecessors, (200), 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) [2021-11-20 22:55:00,041 INFO L276 IsEmpty]: Start isEmpty. Operand 260 states and 300 transitions. [2021-11-20 22:55:00,041 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2021-11-20 22:55:00,042 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:55:00,042 INFO L514 BasicCegarLoop]: trace histogram [20, 20, 20, 20, 20, 20, 19, 1, 1, 1, 1, 1, 1] [2021-11-20 22:55:00,068 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Forceful destruction successful, exit code 0 [2021-11-20 22:55:00,252 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50,45 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:55:00,252 INFO L402 AbstractCegarLoop]: === Iteration 52 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-20 22:55:00,253 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:55:00,253 INFO L85 PathProgramCache]: Analyzing trace with hash -541379305, now seen corresponding path program 9 times [2021-11-20 22:55:00,253 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:55:00,253 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1192499801] [2021-11-20 22:55:00,253 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:55:00,253 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:55:00,275 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:55:01,332 INFO L134 CoverageAnalysis]: Checked inductivity of 1370 backedges. 324 proven. 1046 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:55:01,332 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:55:01,332 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1192499801] [2021-11-20 22:55:01,332 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1192499801] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 22:55:01,332 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1578607570] [2021-11-20 22:55:01,332 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 22:55:01,332 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:55:01,332 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 22:55:01,333 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 22:55:01,337 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Waiting until timeout for monitored process [2021-11-20 22:55:01,572 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 22:55:01,572 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 22:55:01,577 INFO L263 TraceCheckSpWp]: Trace formula consists of 628 conjuncts, 121 conjunts are in the unsatisfiable core [2021-11-20 22:55:01,579 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:55:01,587 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 [2021-11-20 22:55:03,018 INFO L134 CoverageAnalysis]: Checked inductivity of 1370 backedges. 361 proven. 1009 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:55:03,018 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:55:05,919 INFO L134 CoverageAnalysis]: Checked inductivity of 1370 backedges. 400 proven. 970 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:55:05,919 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1578607570] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:55:05,919 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1003667808] [2021-11-20 22:55:05,920 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-20 22:55:05,920 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 22:55:05,920 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 22:55:05,920 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 22:55:05,921 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 22:55:05,931 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 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 [2021-11-20 22:55:06,028 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 [2021-11-20 22:55:06,126 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-20 22:55:06,126 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 138 treesize of output 137 [2021-11-20 22:55:06,423 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 23 treesize of output 19 [2021-11-20 22:55:06,544 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 23 treesize of output 19 [2021-11-20 22:55:06,788 INFO L354 Elim1Store]: treesize reduction 28, result has 33.3 percent of original size [2021-11-20 22:55:06,788 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 139 treesize of output 135 [2021-11-20 22:55:09,751 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 11 treesize of output 7 [2021-11-20 22:55:12,428 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 11 treesize of output 7 [2021-11-20 22:55:14,373 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 11 treesize of output 7 [2021-11-20 22:55:16,929 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 11 treesize of output 7 [2021-11-20 22:55:20,245 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 22:55:22,272 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 22:55:22,272 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 22:55:22,272 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 42, 42] total 106 [2021-11-20 22:55:22,272 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1729235081] [2021-11-20 22:55:22,272 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 22:55:22,273 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 108 states [2021-11-20 22:55:22,273 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:55:22,273 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 108 interpolants. [2021-11-20 22:55:22,274 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1377, Invalid=12195, Unknown=0, NotChecked=0, Total=13572 [2021-11-20 22:55:22,274 INFO L87 Difference]: Start difference. First operand 260 states and 300 transitions. Second operand has 108 states, 107 states have (on average 3.682242990654206) internal successors, (394), 107 states have internal predecessors, (394), 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) [2021-11-20 22:55:24,468 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:55:24,469 INFO L93 Difference]: Finished difference Result 282 states and 326 transitions. [2021-11-20 22:55:24,469 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2021-11-20 22:55:24,469 INFO L78 Accepts]: Start accepts. Automaton has has 108 states, 107 states have (on average 3.682242990654206) internal successors, (394), 107 states have internal predecessors, (394), 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 145 [2021-11-20 22:55:24,469 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:55:24,470 INFO L225 Difference]: With dead ends: 282 [2021-11-20 22:55:24,470 INFO L226 Difference]: Without dead ends: 282 [2021-11-20 22:55:24,471 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 498 GetRequests, 359 SyntacticMatches, 1 SemanticMatches, 138 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5324 ImplicationChecksByTransitivity, 6.4s TimeCoverageRelationStatistics Valid=2728, Invalid=16732, Unknown=0, NotChecked=0, Total=19460 [2021-11-20 22:55:24,472 INFO L933 BasicCegarLoop]: 63 mSDtfsCounter, 1256 mSDsluCounter, 1932 mSDsCounter, 0 mSdLazyCounter, 4109 mSolverCounterSat, 179 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1256 SdHoareTripleChecker+Valid, 1995 SdHoareTripleChecker+Invalid, 4288 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 179 IncrementalHoareTripleChecker+Valid, 4109 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.5s IncrementalHoareTripleChecker+Time [2021-11-20 22:55:24,472 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1256 Valid, 1995 Invalid, 4288 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [179 Valid, 4109 Invalid, 0 Unknown, 0 Unchecked, 1.5s Time] [2021-11-20 22:55:24,473 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 282 states. [2021-11-20 22:55:24,476 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 282 to 271. [2021-11-20 22:55:24,476 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 271 states, 270 states have (on average 1.1592592592592592) internal successors, (313), 270 states have internal predecessors, (313), 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) [2021-11-20 22:55:24,477 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 271 states to 271 states and 313 transitions. [2021-11-20 22:55:24,477 INFO L78 Accepts]: Start accepts. Automaton has 271 states and 313 transitions. Word has length 145 [2021-11-20 22:55:24,477 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:55:24,477 INFO L470 AbstractCegarLoop]: Abstraction has 271 states and 313 transitions. [2021-11-20 22:55:24,478 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 108 states, 107 states have (on average 3.682242990654206) internal successors, (394), 107 states have internal predecessors, (394), 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) [2021-11-20 22:55:24,478 INFO L276 IsEmpty]: Start isEmpty. Operand 271 states and 313 transitions. [2021-11-20 22:55:24,479 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 151 [2021-11-20 22:55:24,479 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:55:24,479 INFO L514 BasicCegarLoop]: trace histogram [21, 21, 21, 21, 20, 20, 20, 1, 1, 1, 1, 1, 1] [2021-11-20 22:55:24,514 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Ended with exit code 0 [2021-11-20 22:55:24,692 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51,46 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:55:24,692 INFO L402 AbstractCegarLoop]: === Iteration 53 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-20 22:55:24,692 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:55:24,693 INFO L85 PathProgramCache]: Analyzing trace with hash 1412950221, now seen corresponding path program 10 times [2021-11-20 22:55:24,693 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:55:24,693 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [638841373] [2021-11-20 22:55:24,693 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:55:24,693 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:55:24,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:55:25,969 INFO L134 CoverageAnalysis]: Checked inductivity of 1471 backedges. 81 proven. 1390 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:55:25,969 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:55:25,969 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [638841373] [2021-11-20 22:55:25,969 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [638841373] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 22:55:25,969 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [118770814] [2021-11-20 22:55:25,970 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 22:55:25,970 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:55:25,970 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 22:55:25,971 INFO L229 MonitoredProcess]: Starting monitored process 47 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 22:55:25,971 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Waiting until timeout for monitored process [2021-11-20 22:55:26,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:55:26,082 INFO L263 TraceCheckSpWp]: Trace formula consists of 646 conjuncts, 142 conjunts are in the unsatisfiable core [2021-11-20 22:55:26,084 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:55:27,013 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 21 treesize of output 17 [2021-11-20 22:55:27,128 INFO L354 Elim1Store]: treesize reduction 26, result has 27.8 percent of original size [2021-11-20 22:55:27,128 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 28 treesize of output 27 [2021-11-20 22:55:27,363 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2021-11-20 22:55:27,370 INFO L134 CoverageAnalysis]: Checked inductivity of 1471 backedges. 81 proven. 1390 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:55:27,370 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:55:27,689 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-20 22:55:27,691 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 22 [2021-11-20 22:55:27,970 INFO L134 CoverageAnalysis]: Checked inductivity of 1471 backedges. 81 proven. 1390 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:55:27,970 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [118770814] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:55:27,970 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1538221652] [2021-11-20 22:55:27,971 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-20 22:55:27,971 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 22:55:27,971 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 22:55:27,972 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 22:55:27,972 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 22:55:28,000 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 [2021-11-20 22:55:28,084 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 [2021-11-20 22:55:28,192 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-20 22:55:28,193 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 138 treesize of output 137 [2021-11-20 22:55:28,472 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 23 treesize of output 19 [2021-11-20 22:55:28,561 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 23 treesize of output 19 [2021-11-20 22:55:28,857 INFO L354 Elim1Store]: treesize reduction 28, result has 33.3 percent of original size [2021-11-20 22:55:28,858 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 139 treesize of output 135 [2021-11-20 22:55:31,709 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 11 treesize of output 7 [2021-11-20 22:55:34,272 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 11 treesize of output 7 [2021-11-20 22:55:36,237 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 11 treesize of output 7 [2021-11-20 22:55:38,684 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 11 treesize of output 7 [2021-11-20 22:55:41,783 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 22:55:43,654 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 22:55:43,654 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 22:55:43,654 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 46, 46] total 73 [2021-11-20 22:55:43,654 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [21595514] [2021-11-20 22:55:43,654 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 22:55:43,655 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 74 states [2021-11-20 22:55:43,655 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:55:43,655 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2021-11-20 22:55:43,655 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=213, Invalid=6593, Unknown=0, NotChecked=0, Total=6806 [2021-11-20 22:55:43,655 INFO L87 Difference]: Start difference. First operand 271 states and 313 transitions. Second operand has 74 states, 74 states have (on average 2.824324324324324) internal successors, (209), 73 states have internal predecessors, (209), 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) [2021-11-20 22:55:47,921 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:55:47,921 INFO L93 Difference]: Finished difference Result 495 states and 575 transitions. [2021-11-20 22:55:47,921 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2021-11-20 22:55:47,921 INFO L78 Accepts]: Start accepts. Automaton has has 74 states, 74 states have (on average 2.824324324324324) internal successors, (209), 73 states have internal predecessors, (209), 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 150 [2021-11-20 22:55:47,922 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:55:47,923 INFO L225 Difference]: With dead ends: 495 [2021-11-20 22:55:47,923 INFO L226 Difference]: Without dead ends: 274 [2021-11-20 22:55:47,924 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 538 GetRequests, 409 SyntacticMatches, 5 SemanticMatches, 124 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 1957 ImplicationChecksByTransitivity, 5.9s TimeCoverageRelationStatistics Valid=550, Invalid=15200, Unknown=0, NotChecked=0, Total=15750 [2021-11-20 22:55:47,925 INFO L933 BasicCegarLoop]: 61 mSDtfsCounter, 434 mSDsluCounter, 3373 mSDsCounter, 0 mSdLazyCounter, 7054 mSolverCounterSat, 202 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 434 SdHoareTripleChecker+Valid, 3406 SdHoareTripleChecker+Invalid, 7335 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 202 IncrementalHoareTripleChecker+Valid, 7054 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 79 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2021-11-20 22:55:47,925 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [434 Valid, 3406 Invalid, 7335 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [202 Valid, 7054 Invalid, 0 Unknown, 79 Unchecked, 2.4s Time] [2021-11-20 22:55:47,926 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 274 states. [2021-11-20 22:55:47,929 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 274 to 273. [2021-11-20 22:55:47,929 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 273 states, 272 states have (on average 1.1580882352941178) internal successors, (315), 272 states have internal predecessors, (315), 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) [2021-11-20 22:55:47,929 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 273 states to 273 states and 315 transitions. [2021-11-20 22:55:47,930 INFO L78 Accepts]: Start accepts. Automaton has 273 states and 315 transitions. Word has length 150 [2021-11-20 22:55:47,930 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:55:47,930 INFO L470 AbstractCegarLoop]: Abstraction has 273 states and 315 transitions. [2021-11-20 22:55:47,930 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 74 states, 74 states have (on average 2.824324324324324) internal successors, (209), 73 states have internal predecessors, (209), 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) [2021-11-20 22:55:47,930 INFO L276 IsEmpty]: Start isEmpty. Operand 273 states and 315 transitions. [2021-11-20 22:55:47,931 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 153 [2021-11-20 22:55:47,931 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:55:47,932 INFO L514 BasicCegarLoop]: trace histogram [21, 21, 21, 21, 21, 21, 20, 1, 1, 1, 1, 1, 1] [2021-11-20 22:55:47,971 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Forceful destruction successful, exit code 0 [2021-11-20 22:55:48,151 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable52,47 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:55:48,152 INFO L402 AbstractCegarLoop]: === Iteration 54 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-20 22:55:48,152 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:55:48,152 INFO L85 PathProgramCache]: Analyzing trace with hash -1286787591, now seen corresponding path program 11 times [2021-11-20 22:55:48,152 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:55:48,152 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [379278638] [2021-11-20 22:55:48,152 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:55:48,152 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:55:48,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:55:49,255 INFO L134 CoverageAnalysis]: Checked inductivity of 1512 backedges. 361 proven. 1151 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:55:49,255 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:55:49,255 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [379278638] [2021-11-20 22:55:49,255 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [379278638] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 22:55:49,256 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [235052426] [2021-11-20 22:55:49,256 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 22:55:49,256 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:55:49,256 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 22:55:49,260 INFO L229 MonitoredProcess]: Starting monitored process 48 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 22:55:49,261 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Waiting until timeout for monitored process [2021-11-20 22:55:50,023 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 22 check-sat command(s) [2021-11-20 22:55:50,023 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 22:55:50,028 INFO L263 TraceCheckSpWp]: Trace formula consists of 656 conjuncts, 100 conjunts are in the unsatisfiable core [2021-11-20 22:55:50,030 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:55:51,787 INFO L134 CoverageAnalysis]: Checked inductivity of 1512 backedges. 400 proven. 1112 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:55:51,787 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:55:53,399 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2021-11-20 22:55:53,507 INFO L134 CoverageAnalysis]: Checked inductivity of 1512 backedges. 400 proven. 1112 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:55:53,507 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [235052426] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:55:53,507 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [129865034] [2021-11-20 22:55:53,508 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-20 22:55:53,508 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 22:55:53,508 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 22:55:53,508 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 22:55:53,508 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 22:55:53,569 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 [2021-11-20 22:55:53,662 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 20 treesize of output 16 [2021-11-20 22:55:53,778 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-20 22:55:53,778 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 138 treesize of output 137 [2021-11-20 22:55:54,126 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 23 treesize of output 19 [2021-11-20 22:55:54,233 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 23 treesize of output 19 [2021-11-20 22:55:54,466 INFO L354 Elim1Store]: treesize reduction 28, result has 33.3 percent of original size [2021-11-20 22:55:54,466 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 139 treesize of output 135 [2021-11-20 22:55:57,382 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 11 treesize of output 7 [2021-11-20 22:55:59,931 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 11 treesize of output 7 [2021-11-20 22:56:01,895 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 11 treesize of output 7 [2021-11-20 22:56:04,298 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 11 treesize of output 7 [2021-11-20 22:56:07,419 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 22:56:09,138 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 22:56:09,138 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 22:56:09,138 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 45, 45] total 112 [2021-11-20 22:56:09,138 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1541323022] [2021-11-20 22:56:09,138 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 22:56:09,139 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 114 states [2021-11-20 22:56:09,139 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:56:09,139 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 114 interpolants. [2021-11-20 22:56:09,140 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2099, Invalid=12907, Unknown=0, NotChecked=0, Total=15006 [2021-11-20 22:56:09,140 INFO L87 Difference]: Start difference. First operand 273 states and 315 transitions. Second operand has 114 states, 113 states have (on average 3.646017699115044) internal successors, (412), 113 states have internal predecessors, (412), 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) [2021-11-20 22:56:10,735 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:56:10,735 INFO L93 Difference]: Finished difference Result 295 states and 341 transitions. [2021-11-20 22:56:10,735 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-11-20 22:56:10,736 INFO L78 Accepts]: Start accepts. Automaton has has 114 states, 113 states have (on average 3.646017699115044) internal successors, (412), 113 states have internal predecessors, (412), 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 152 [2021-11-20 22:56:10,736 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:56:10,737 INFO L225 Difference]: With dead ends: 295 [2021-11-20 22:56:10,737 INFO L226 Difference]: Without dead ends: 295 [2021-11-20 22:56:10,738 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 522 GetRequests, 376 SyntacticMatches, 1 SemanticMatches, 145 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6652 ImplicationChecksByTransitivity, 5.8s TimeCoverageRelationStatistics Valid=3794, Invalid=17668, Unknown=0, NotChecked=0, Total=21462 [2021-11-20 22:56:10,738 INFO L933 BasicCegarLoop]: 66 mSDtfsCounter, 2642 mSDsluCounter, 1128 mSDsCounter, 0 mSdLazyCounter, 1935 mSolverCounterSat, 377 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2642 SdHoareTripleChecker+Valid, 1194 SdHoareTripleChecker+Invalid, 2312 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 377 IncrementalHoareTripleChecker+Valid, 1935 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-20 22:56:10,738 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2642 Valid, 1194 Invalid, 2312 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [377 Valid, 1935 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-20 22:56:10,739 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 295 states. [2021-11-20 22:56:10,741 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 295 to 284. [2021-11-20 22:56:10,742 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 284 states, 283 states have (on average 1.1590106007067138) internal successors, (328), 283 states have internal predecessors, (328), 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) [2021-11-20 22:56:10,742 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 284 states to 284 states and 328 transitions. [2021-11-20 22:56:10,743 INFO L78 Accepts]: Start accepts. Automaton has 284 states and 328 transitions. Word has length 152 [2021-11-20 22:56:10,743 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:56:10,743 INFO L470 AbstractCegarLoop]: Abstraction has 284 states and 328 transitions. [2021-11-20 22:56:10,743 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 114 states, 113 states have (on average 3.646017699115044) internal successors, (412), 113 states have internal predecessors, (412), 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) [2021-11-20 22:56:10,743 INFO L276 IsEmpty]: Start isEmpty. Operand 284 states and 328 transitions. [2021-11-20 22:56:10,744 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 158 [2021-11-20 22:56:10,744 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:56:10,745 INFO L514 BasicCegarLoop]: trace histogram [22, 22, 22, 22, 21, 21, 21, 1, 1, 1, 1, 1, 1] [2021-11-20 22:56:10,775 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Forceful destruction successful, exit code 0 [2021-11-20 22:56:10,972 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 48 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable53 [2021-11-20 22:56:10,972 INFO L402 AbstractCegarLoop]: === Iteration 55 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-20 22:56:10,972 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:56:10,973 INFO L85 PathProgramCache]: Analyzing trace with hash -959959765, now seen corresponding path program 12 times [2021-11-20 22:56:10,973 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:56:10,973 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1164099551] [2021-11-20 22:56:10,973 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:56:10,973 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:56:11,021 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:56:12,223 INFO L134 CoverageAnalysis]: Checked inductivity of 1618 backedges. 85 proven. 1533 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:56:12,223 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:56:12,223 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1164099551] [2021-11-20 22:56:12,223 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1164099551] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 22:56:12,223 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2071009886] [2021-11-20 22:56:12,223 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 22:56:12,223 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:56:12,224 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 22:56:12,224 INFO L229 MonitoredProcess]: Starting monitored process 49 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 22:56:12,225 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Waiting until timeout for monitored process [2021-11-20 22:56:12,778 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 22:56:12,778 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 22:56:12,784 INFO L263 TraceCheckSpWp]: Trace formula consists of 674 conjuncts, 148 conjunts are in the unsatisfiable core [2021-11-20 22:56:12,788 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:56:13,808 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 21 treesize of output 17 [2021-11-20 22:56:13,944 INFO L354 Elim1Store]: treesize reduction 26, result has 27.8 percent of original size [2021-11-20 22:56:13,945 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 28 treesize of output 27 [2021-11-20 22:56:14,184 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2021-11-20 22:56:14,192 INFO L134 CoverageAnalysis]: Checked inductivity of 1618 backedges. 85 proven. 1533 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:56:14,192 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:56:14,568 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-20 22:56:14,569 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 22 [2021-11-20 22:56:14,861 INFO L134 CoverageAnalysis]: Checked inductivity of 1618 backedges. 85 proven. 1533 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:56:14,861 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2071009886] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:56:14,861 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [257081586] [2021-11-20 22:56:14,862 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-20 22:56:14,862 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 22:56:14,862 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 22:56:14,862 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 22:56:14,862 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 22:56:14,872 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 [2021-11-20 22:56:14,967 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 23 treesize of output 19 [2021-11-20 22:56:15,059 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:56:15,059 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 144 treesize of output 136 [2021-11-20 22:56:15,266 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 23 treesize of output 19 [2021-11-20 22:56:15,415 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 23 treesize of output 19 [2021-11-20 22:56:15,648 INFO L354 Elim1Store]: treesize reduction 28, result has 33.3 percent of original size [2021-11-20 22:56:15,648 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 139 treesize of output 135 [2021-11-20 22:56:18,379 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 11 treesize of output 7 [2021-11-20 22:56:20,900 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 11 treesize of output 7 [2021-11-20 22:56:22,790 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 11 treesize of output 7 [2021-11-20 22:56:25,282 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 11 treesize of output 7 [2021-11-20 22:56:28,321 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 22:56:30,257 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 22:56:30,257 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 22:56:30,258 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 48, 48] total 76 [2021-11-20 22:56:30,258 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [603581613] [2021-11-20 22:56:30,258 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 22:56:30,258 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 77 states [2021-11-20 22:56:30,258 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:56:30,259 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 77 interpolants. [2021-11-20 22:56:30,259 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=220, Invalid=7090, Unknown=0, NotChecked=0, Total=7310 [2021-11-20 22:56:30,259 INFO L87 Difference]: Start difference. First operand 284 states and 328 transitions. Second operand has 77 states, 77 states have (on average 2.831168831168831) internal successors, (218), 76 states have internal predecessors, (218), 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) [2021-11-20 22:56:34,724 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:56:34,724 INFO L93 Difference]: Finished difference Result 519 states and 603 transitions. [2021-11-20 22:56:34,725 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2021-11-20 22:56:34,725 INFO L78 Accepts]: Start accepts. Automaton has has 77 states, 77 states have (on average 2.831168831168831) internal successors, (218), 76 states have internal predecessors, (218), 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 157 [2021-11-20 22:56:34,725 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:56:34,726 INFO L225 Difference]: With dead ends: 519 [2021-11-20 22:56:34,726 INFO L226 Difference]: Without dead ends: 287 [2021-11-20 22:56:34,728 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 563 GetRequests, 429 SyntacticMatches, 5 SemanticMatches, 129 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 2099 ImplicationChecksByTransitivity, 6.2s TimeCoverageRelationStatistics Valid=572, Invalid=16458, Unknown=0, NotChecked=0, Total=17030 [2021-11-20 22:56:34,728 INFO L933 BasicCegarLoop]: 64 mSDtfsCounter, 349 mSDsluCounter, 3457 mSDsCounter, 0 mSdLazyCounter, 7244 mSolverCounterSat, 170 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 349 SdHoareTripleChecker+Valid, 3494 SdHoareTripleChecker+Invalid, 7549 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 170 IncrementalHoareTripleChecker+Valid, 7244 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 135 IncrementalHoareTripleChecker+Unchecked, 2.5s IncrementalHoareTripleChecker+Time [2021-11-20 22:56:34,728 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [349 Valid, 3494 Invalid, 7549 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [170 Valid, 7244 Invalid, 0 Unknown, 135 Unchecked, 2.5s Time] [2021-11-20 22:56:34,729 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 287 states. [2021-11-20 22:56:34,732 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 287 to 286. [2021-11-20 22:56:34,732 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 286 states, 285 states have (on average 1.1578947368421053) internal successors, (330), 285 states have internal predecessors, (330), 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) [2021-11-20 22:56:34,733 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 286 states to 286 states and 330 transitions. [2021-11-20 22:56:34,733 INFO L78 Accepts]: Start accepts. Automaton has 286 states and 330 transitions. Word has length 157 [2021-11-20 22:56:34,733 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:56:34,733 INFO L470 AbstractCegarLoop]: Abstraction has 286 states and 330 transitions. [2021-11-20 22:56:34,734 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 77 states, 77 states have (on average 2.831168831168831) internal successors, (218), 76 states have internal predecessors, (218), 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) [2021-11-20 22:56:34,734 INFO L276 IsEmpty]: Start isEmpty. Operand 286 states and 330 transitions. [2021-11-20 22:56:34,735 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 160 [2021-11-20 22:56:34,735 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:56:34,735 INFO L514 BasicCegarLoop]: trace histogram [22, 22, 22, 22, 22, 22, 21, 1, 1, 1, 1, 1, 1] [2021-11-20 22:56:34,758 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Forceful destruction successful, exit code 0 [2021-11-20 22:56:34,944 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable54 [2021-11-20 22:56:34,945 INFO L402 AbstractCegarLoop]: === Iteration 56 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-20 22:56:34,945 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:56:34,945 INFO L85 PathProgramCache]: Analyzing trace with hash -1042350465, now seen corresponding path program 13 times [2021-11-20 22:56:34,945 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:56:34,945 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1864283605] [2021-11-20 22:56:34,945 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:56:34,945 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:56:34,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:56:36,046 INFO L134 CoverageAnalysis]: Checked inductivity of 1661 backedges. 400 proven. 1261 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:56:36,046 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:56:36,046 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1864283605] [2021-11-20 22:56:36,046 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1864283605] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 22:56:36,046 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1592247431] [2021-11-20 22:56:36,047 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 22:56:36,047 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:56:36,047 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 22:56:36,047 INFO L229 MonitoredProcess]: Starting monitored process 50 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 22:56:36,048 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Waiting until timeout for monitored process [2021-11-20 22:56:36,163 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:56:36,168 INFO L263 TraceCheckSpWp]: Trace formula consists of 684 conjuncts, 125 conjunts are in the unsatisfiable core [2021-11-20 22:56:36,172 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:56:37,474 INFO L134 CoverageAnalysis]: Checked inductivity of 1661 backedges. 441 proven. 1220 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:56:37,474 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:56:38,920 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2021-11-20 22:56:39,039 INFO L134 CoverageAnalysis]: Checked inductivity of 1661 backedges. 441 proven. 1220 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:56:39,040 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1592247431] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:56:39,040 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1735173680] [2021-11-20 22:56:39,041 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-20 22:56:39,041 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 22:56:39,041 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 22:56:39,042 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 22:56:39,042 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 22:56:39,060 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 [2021-11-20 22:56:39,175 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 [2021-11-20 22:56:39,282 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-20 22:56:39,282 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 138 treesize of output 137 [2021-11-20 22:56:39,578 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 23 treesize of output 19 [2021-11-20 22:56:39,704 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 23 treesize of output 19 [2021-11-20 22:56:39,958 INFO L354 Elim1Store]: treesize reduction 28, result has 33.3 percent of original size [2021-11-20 22:56:39,958 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 139 treesize of output 135 [2021-11-20 22:56:42,641 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 11 treesize of output 7 [2021-11-20 22:56:45,238 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 11 treesize of output 7 [2021-11-20 22:56:47,096 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 11 treesize of output 7 [2021-11-20 22:56:49,476 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 11 treesize of output 7 [2021-11-20 22:56:52,603 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 22:56:54,363 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 22:56:54,364 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 22:56:54,364 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 47, 47] total 95 [2021-11-20 22:56:54,364 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [570467393] [2021-11-20 22:56:54,364 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 22:56:54,364 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 97 states [2021-11-20 22:56:54,365 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:56:54,365 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 97 interpolants. [2021-11-20 22:56:54,366 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1230, Invalid=9900, Unknown=0, NotChecked=0, Total=11130 [2021-11-20 22:56:54,366 INFO L87 Difference]: Start difference. First operand 286 states and 330 transitions. Second operand has 97 states, 96 states have (on average 3.3854166666666665) internal successors, (325), 96 states have internal predecessors, (325), 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) [2021-11-20 22:56:56,656 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:56:56,657 INFO L93 Difference]: Finished difference Result 308 states and 356 transitions. [2021-11-20 22:56:56,657 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2021-11-20 22:56:56,657 INFO L78 Accepts]: Start accepts. Automaton has has 97 states, 96 states have (on average 3.3854166666666665) internal successors, (325), 96 states have internal predecessors, (325), 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 159 [2021-11-20 22:56:56,657 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:56:56,658 INFO L225 Difference]: With dead ends: 308 [2021-11-20 22:56:56,658 INFO L226 Difference]: Without dead ends: 308 [2021-11-20 22:56:56,659 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 546 GetRequests, 415 SyntacticMatches, 2 SemanticMatches, 129 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4823 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=2755, Invalid=14275, Unknown=0, NotChecked=0, Total=17030 [2021-11-20 22:56:56,659 INFO L933 BasicCegarLoop]: 69 mSDtfsCounter, 1671 mSDsluCounter, 1701 mSDsCounter, 0 mSdLazyCounter, 3833 mSolverCounterSat, 215 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1671 SdHoareTripleChecker+Valid, 1770 SdHoareTripleChecker+Invalid, 4048 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 215 IncrementalHoareTripleChecker+Valid, 3833 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.5s IncrementalHoareTripleChecker+Time [2021-11-20 22:56:56,660 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1671 Valid, 1770 Invalid, 4048 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [215 Valid, 3833 Invalid, 0 Unknown, 0 Unchecked, 1.5s Time] [2021-11-20 22:56:56,660 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 308 states. [2021-11-20 22:56:56,663 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 308 to 297. [2021-11-20 22:56:56,663 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 297 states, 296 states have (on average 1.1587837837837838) internal successors, (343), 296 states have internal predecessors, (343), 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) [2021-11-20 22:56:56,664 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 297 states to 297 states and 343 transitions. [2021-11-20 22:56:56,664 INFO L78 Accepts]: Start accepts. Automaton has 297 states and 343 transitions. Word has length 159 [2021-11-20 22:56:56,664 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:56:56,665 INFO L470 AbstractCegarLoop]: Abstraction has 297 states and 343 transitions. [2021-11-20 22:56:56,665 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 97 states, 96 states have (on average 3.3854166666666665) internal successors, (325), 96 states have internal predecessors, (325), 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) [2021-11-20 22:56:56,665 INFO L276 IsEmpty]: Start isEmpty. Operand 297 states and 343 transitions. [2021-11-20 22:56:56,666 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 165 [2021-11-20 22:56:56,666 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:56:56,666 INFO L514 BasicCegarLoop]: trace histogram [23, 23, 23, 23, 22, 22, 22, 1, 1, 1, 1, 1, 1] [2021-11-20 22:56:56,707 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Forceful destruction successful, exit code 0 [2021-11-20 22:56:56,892 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 50 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable55 [2021-11-20 22:56:56,892 INFO L402 AbstractCegarLoop]: === Iteration 57 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-20 22:56:56,893 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:56:56,893 INFO L85 PathProgramCache]: Analyzing trace with hash -8273819, now seen corresponding path program 14 times [2021-11-20 22:56:56,893 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:56:56,893 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1056118823] [2021-11-20 22:56:56,893 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:56:56,893 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:56:56,933 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:56:58,206 INFO L134 CoverageAnalysis]: Checked inductivity of 1772 backedges. 89 proven. 1683 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:56:58,206 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:56:58,206 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1056118823] [2021-11-20 22:56:58,206 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1056118823] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 22:56:58,206 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [134392821] [2021-11-20 22:56:58,206 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 22:56:58,206 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:56:58,207 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 22:56:58,208 INFO L229 MonitoredProcess]: Starting monitored process 51 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 22:56:58,209 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Waiting until timeout for monitored process [2021-11-20 22:57:00,295 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2021-11-20 22:57:00,295 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 22:57:00,305 INFO L263 TraceCheckSpWp]: Trace formula consists of 702 conjuncts, 154 conjunts are in the unsatisfiable core [2021-11-20 22:57:00,308 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:57:01,396 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 21 treesize of output 17 [2021-11-20 22:57:01,515 INFO L354 Elim1Store]: treesize reduction 26, result has 27.8 percent of original size [2021-11-20 22:57:01,515 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 28 treesize of output 27 [2021-11-20 22:57:01,766 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2021-11-20 22:57:01,792 INFO L134 CoverageAnalysis]: Checked inductivity of 1772 backedges. 89 proven. 1683 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:57:01,793 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:57:02,145 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-20 22:57:02,147 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 22 [2021-11-20 22:57:02,448 INFO L134 CoverageAnalysis]: Checked inductivity of 1772 backedges. 89 proven. 1683 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:57:02,448 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [134392821] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:57:02,449 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [927124358] [2021-11-20 22:57:02,449 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-20 22:57:02,449 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 22:57:02,449 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 22:57:02,450 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 22:57:02,450 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 22:57:02,478 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 [2021-11-20 22:57:02,542 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 [2021-11-20 22:57:02,674 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-20 22:57:02,675 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 138 treesize of output 137 [2021-11-20 22:57:02,948 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 23 treesize of output 19 [2021-11-20 22:57:03,061 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 23 treesize of output 19 [2021-11-20 22:57:03,313 INFO L354 Elim1Store]: treesize reduction 28, result has 33.3 percent of original size [2021-11-20 22:57:03,313 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 139 treesize of output 135 [2021-11-20 22:57:06,213 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 11 treesize of output 7 [2021-11-20 22:57:08,721 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 11 treesize of output 7 [2021-11-20 22:57:10,727 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 11 treesize of output 7 [2021-11-20 22:57:13,123 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 11 treesize of output 7 [2021-11-20 22:57:16,192 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 22:57:18,164 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 22:57:18,164 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 22:57:18,164 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 50, 50] total 79 [2021-11-20 22:57:18,164 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [96269976] [2021-11-20 22:57:18,165 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 22:57:18,165 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 80 states [2021-11-20 22:57:18,165 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:57:18,166 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 80 interpolants. [2021-11-20 22:57:18,166 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=227, Invalid=7605, Unknown=0, NotChecked=0, Total=7832 [2021-11-20 22:57:18,166 INFO L87 Difference]: Start difference. First operand 297 states and 343 transitions. Second operand has 80 states, 80 states have (on average 2.8375) internal successors, (227), 79 states have internal predecessors, (227), 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) [2021-11-20 22:57:22,899 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:57:22,899 INFO L93 Difference]: Finished difference Result 543 states and 631 transitions. [2021-11-20 22:57:22,899 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2021-11-20 22:57:22,899 INFO L78 Accepts]: Start accepts. Automaton has has 80 states, 80 states have (on average 2.8375) internal successors, (227), 79 states have internal predecessors, (227), 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 164 [2021-11-20 22:57:22,899 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:57:22,901 INFO L225 Difference]: With dead ends: 543 [2021-11-20 22:57:22,901 INFO L226 Difference]: Without dead ends: 300 [2021-11-20 22:57:22,901 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 588 GetRequests, 449 SyntacticMatches, 5 SemanticMatches, 134 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 2246 ImplicationChecksByTransitivity, 6.5s TimeCoverageRelationStatistics Valid=594, Invalid=17766, Unknown=0, NotChecked=0, Total=18360 [2021-11-20 22:57:22,902 INFO L933 BasicCegarLoop]: 67 mSDtfsCounter, 365 mSDsluCounter, 3632 mSDsCounter, 0 mSdLazyCounter, 7590 mSolverCounterSat, 178 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 365 SdHoareTripleChecker+Valid, 3670 SdHoareTripleChecker+Invalid, 7907 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 178 IncrementalHoareTripleChecker+Valid, 7590 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 139 IncrementalHoareTripleChecker+Unchecked, 2.6s IncrementalHoareTripleChecker+Time [2021-11-20 22:57:22,902 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [365 Valid, 3670 Invalid, 7907 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [178 Valid, 7590 Invalid, 0 Unknown, 139 Unchecked, 2.6s Time] [2021-11-20 22:57:22,902 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 300 states. [2021-11-20 22:57:22,904 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 300 to 299. [2021-11-20 22:57:22,905 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 299 states, 298 states have (on average 1.157718120805369) internal successors, (345), 298 states have internal predecessors, (345), 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) [2021-11-20 22:57:22,905 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 299 states to 299 states and 345 transitions. [2021-11-20 22:57:22,905 INFO L78 Accepts]: Start accepts. Automaton has 299 states and 345 transitions. Word has length 164 [2021-11-20 22:57:22,905 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:57:22,905 INFO L470 AbstractCegarLoop]: Abstraction has 299 states and 345 transitions. [2021-11-20 22:57:22,905 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 80 states, 80 states have (on average 2.8375) internal successors, (227), 79 states have internal predecessors, (227), 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) [2021-11-20 22:57:22,905 INFO L276 IsEmpty]: Start isEmpty. Operand 299 states and 345 transitions. [2021-11-20 22:57:22,906 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 167 [2021-11-20 22:57:22,906 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:57:22,907 INFO L514 BasicCegarLoop]: trace histogram [23, 23, 23, 23, 23, 23, 22, 1, 1, 1, 1, 1, 1] [2021-11-20 22:57:22,931 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Forceful destruction successful, exit code 0 [2021-11-20 22:57:23,108 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable56,51 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:57:23,108 INFO L402 AbstractCegarLoop]: === Iteration 58 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-20 22:57:23,108 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:57:23,109 INFO L85 PathProgramCache]: Analyzing trace with hash 1798342801, now seen corresponding path program 15 times [2021-11-20 22:57:23,109 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:57:23,109 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1937869865] [2021-11-20 22:57:23,109 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:57:23,109 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:57:23,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:57:24,237 INFO L134 CoverageAnalysis]: Checked inductivity of 1817 backedges. 441 proven. 1376 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:57:24,237 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:57:24,237 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1937869865] [2021-11-20 22:57:24,237 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1937869865] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 22:57:24,237 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1864012461] [2021-11-20 22:57:24,237 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 22:57:24,237 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:57:24,237 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 22:57:24,238 INFO L229 MonitoredProcess]: Starting monitored process 52 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 22:57:24,239 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Waiting until timeout for monitored process [2021-11-20 22:57:24,694 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 22:57:24,694 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 22:57:24,700 INFO L263 TraceCheckSpWp]: Trace formula consists of 712 conjuncts, 136 conjunts are in the unsatisfiable core [2021-11-20 22:57:24,702 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:57:24,724 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 [2021-11-20 22:57:26,536 INFO L134 CoverageAnalysis]: Checked inductivity of 1817 backedges. 484 proven. 1333 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:57:26,537 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:57:30,136 INFO L134 CoverageAnalysis]: Checked inductivity of 1817 backedges. 529 proven. 1288 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:57:30,137 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1864012461] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:57:30,137 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1164969302] [2021-11-20 22:57:30,137 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-20 22:57:30,137 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 22:57:30,138 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 22:57:30,138 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 22:57:30,138 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 22:57:30,184 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 [2021-11-20 22:57:30,249 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 [2021-11-20 22:57:30,367 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-20 22:57:30,368 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 138 treesize of output 137 [2021-11-20 22:57:30,617 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 23 treesize of output 19 [2021-11-20 22:57:30,731 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 23 treesize of output 19 [2021-11-20 22:57:30,960 INFO L354 Elim1Store]: treesize reduction 28, result has 33.3 percent of original size [2021-11-20 22:57:30,960 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 139 treesize of output 135 [2021-11-20 22:57:33,825 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 11 treesize of output 7 [2021-11-20 22:57:36,324 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 11 treesize of output 7 [2021-11-20 22:57:38,208 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 11 treesize of output 7 [2021-11-20 22:57:40,899 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 11 treesize of output 7 [2021-11-20 22:57:43,912 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 22:57:46,079 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 22:57:46,079 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 22:57:46,080 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 48, 48] total 121 [2021-11-20 22:57:46,080 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1248542350] [2021-11-20 22:57:46,080 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 22:57:46,080 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 123 states [2021-11-20 22:57:46,080 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:57:46,081 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 123 interpolants. [2021-11-20 22:57:46,081 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1749, Invalid=15543, Unknown=0, NotChecked=0, Total=17292 [2021-11-20 22:57:46,082 INFO L87 Difference]: Start difference. First operand 299 states and 345 transitions. Second operand has 123 states, 122 states have (on average 3.69672131147541) internal successors, (451), 122 states have internal predecessors, (451), 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) [2021-11-20 22:57:48,810 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:57:48,810 INFO L93 Difference]: Finished difference Result 321 states and 371 transitions. [2021-11-20 22:57:48,810 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2021-11-20 22:57:48,810 INFO L78 Accepts]: Start accepts. Automaton has has 123 states, 122 states have (on average 3.69672131147541) internal successors, (451), 122 states have internal predecessors, (451), 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 166 [2021-11-20 22:57:48,810 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:57:48,811 INFO L225 Difference]: With dead ends: 321 [2021-11-20 22:57:48,812 INFO L226 Difference]: Without dead ends: 321 [2021-11-20 22:57:48,812 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 570 GetRequests, 413 SyntacticMatches, 1 SemanticMatches, 156 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6842 ImplicationChecksByTransitivity, 7.5s TimeCoverageRelationStatistics Valid=3472, Invalid=21334, Unknown=0, NotChecked=0, Total=24806 [2021-11-20 22:57:48,813 INFO L933 BasicCegarLoop]: 72 mSDtfsCounter, 1193 mSDsluCounter, 2355 mSDsCounter, 0 mSdLazyCounter, 5190 mSolverCounterSat, 151 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1193 SdHoareTripleChecker+Valid, 2427 SdHoareTripleChecker+Invalid, 5341 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 151 IncrementalHoareTripleChecker+Valid, 5190 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.9s IncrementalHoareTripleChecker+Time [2021-11-20 22:57:48,813 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1193 Valid, 2427 Invalid, 5341 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [151 Valid, 5190 Invalid, 0 Unknown, 0 Unchecked, 1.9s Time] [2021-11-20 22:57:48,813 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 321 states. [2021-11-20 22:57:48,816 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 321 to 310. [2021-11-20 22:57:48,817 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 310 states, 309 states have (on average 1.1585760517799353) internal successors, (358), 309 states have internal predecessors, (358), 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) [2021-11-20 22:57:48,817 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 310 states to 310 states and 358 transitions. [2021-11-20 22:57:48,817 INFO L78 Accepts]: Start accepts. Automaton has 310 states and 358 transitions. Word has length 166 [2021-11-20 22:57:48,818 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:57:48,818 INFO L470 AbstractCegarLoop]: Abstraction has 310 states and 358 transitions. [2021-11-20 22:57:48,818 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 123 states, 122 states have (on average 3.69672131147541) internal successors, (451), 122 states have internal predecessors, (451), 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) [2021-11-20 22:57:48,818 INFO L276 IsEmpty]: Start isEmpty. Operand 310 states and 358 transitions. [2021-11-20 22:57:48,819 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 172 [2021-11-20 22:57:48,819 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:57:48,820 INFO L514 BasicCegarLoop]: trace histogram [24, 24, 24, 24, 23, 23, 23, 1, 1, 1, 1, 1, 1] [2021-11-20 22:57:48,857 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Forceful destruction successful, exit code 0 [2021-11-20 22:57:49,036 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 52 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable57 [2021-11-20 22:57:49,036 INFO L402 AbstractCegarLoop]: === Iteration 59 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-20 22:57:49,036 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:57:49,037 INFO L85 PathProgramCache]: Analyzing trace with hash 474853779, now seen corresponding path program 16 times [2021-11-20 22:57:49,037 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:57:49,037 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [229003049] [2021-11-20 22:57:49,037 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:57:49,037 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:57:49,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:57:50,597 INFO L134 CoverageAnalysis]: Checked inductivity of 1933 backedges. 93 proven. 1840 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:57:50,597 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:57:50,597 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [229003049] [2021-11-20 22:57:50,597 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [229003049] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 22:57:50,597 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [500432233] [2021-11-20 22:57:50,597 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 22:57:50,597 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:57:50,597 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 22:57:50,598 INFO L229 MonitoredProcess]: Starting monitored process 53 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 22:57:50,599 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Waiting until timeout for monitored process [2021-11-20 22:57:50,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:57:50,722 INFO L263 TraceCheckSpWp]: Trace formula consists of 730 conjuncts, 160 conjunts are in the unsatisfiable core [2021-11-20 22:57:50,724 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:57:51,888 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 21 treesize of output 17 [2021-11-20 22:57:52,010 INFO L354 Elim1Store]: treesize reduction 26, result has 27.8 percent of original size [2021-11-20 22:57:52,010 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 28 treesize of output 27 [2021-11-20 22:57:52,305 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2021-11-20 22:57:52,315 INFO L134 CoverageAnalysis]: Checked inductivity of 1933 backedges. 93 proven. 1840 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:57:52,315 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:57:52,677 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-20 22:57:52,679 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 22 [2021-11-20 22:57:52,992 INFO L134 CoverageAnalysis]: Checked inductivity of 1933 backedges. 93 proven. 1840 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:57:52,992 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [500432233] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:57:52,992 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2094130776] [2021-11-20 22:57:52,993 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-20 22:57:52,993 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 22:57:52,993 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 22:57:52,993 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 22:57:52,993 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 22:57:53,028 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 [2021-11-20 22:57:53,097 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 23 treesize of output 19 [2021-11-20 22:57:53,182 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:57:53,183 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 144 treesize of output 136 [2021-11-20 22:57:53,427 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 23 treesize of output 19 [2021-11-20 22:57:53,499 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 23 treesize of output 19 [2021-11-20 22:57:53,747 INFO L354 Elim1Store]: treesize reduction 28, result has 33.3 percent of original size [2021-11-20 22:57:53,748 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 139 treesize of output 135 [2021-11-20 22:57:56,506 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 11 treesize of output 7 [2021-11-20 22:57:59,061 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 11 treesize of output 7 [2021-11-20 22:58:01,044 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 11 treesize of output 7 [2021-11-20 22:58:03,449 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 11 treesize of output 7 [2021-11-20 22:58:06,549 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 22:58:08,561 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 22:58:08,561 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 22:58:08,561 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 52, 52] total 82 [2021-11-20 22:58:08,561 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1845199542] [2021-11-20 22:58:08,561 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 22:58:08,562 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 83 states [2021-11-20 22:58:08,562 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:58:08,562 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 83 interpolants. [2021-11-20 22:58:08,562 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=234, Invalid=8138, Unknown=0, NotChecked=0, Total=8372 [2021-11-20 22:58:08,563 INFO L87 Difference]: Start difference. First operand 310 states and 358 transitions. Second operand has 83 states, 83 states have (on average 2.8433734939759034) internal successors, (236), 82 states have internal predecessors, (236), 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) [2021-11-20 22:58:14,305 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:58:14,305 INFO L93 Difference]: Finished difference Result 567 states and 659 transitions. [2021-11-20 22:58:14,305 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2021-11-20 22:58:14,305 INFO L78 Accepts]: Start accepts. Automaton has has 83 states, 83 states have (on average 2.8433734939759034) internal successors, (236), 82 states have internal predecessors, (236), 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 171 [2021-11-20 22:58:14,305 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:58:14,306 INFO L225 Difference]: With dead ends: 567 [2021-11-20 22:58:14,307 INFO L226 Difference]: Without dead ends: 313 [2021-11-20 22:58:14,307 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 613 GetRequests, 469 SyntacticMatches, 5 SemanticMatches, 139 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 2398 ImplicationChecksByTransitivity, 7.2s TimeCoverageRelationStatistics Valid=616, Invalid=19124, Unknown=0, NotChecked=0, Total=19740 [2021-11-20 22:58:14,308 INFO L933 BasicCegarLoop]: 70 mSDtfsCounter, 379 mSDsluCounter, 4353 mSDsCounter, 0 mSdLazyCounter, 9188 mSolverCounterSat, 185 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 379 SdHoareTripleChecker+Valid, 4394 SdHoareTripleChecker+Invalid, 9373 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 185 IncrementalHoareTripleChecker+Valid, 9188 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.2s IncrementalHoareTripleChecker+Time [2021-11-20 22:58:14,308 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [379 Valid, 4394 Invalid, 9373 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [185 Valid, 9188 Invalid, 0 Unknown, 0 Unchecked, 3.2s Time] [2021-11-20 22:58:14,308 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 313 states. [2021-11-20 22:58:14,311 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 313 to 312. [2021-11-20 22:58:14,312 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 312 states, 311 states have (on average 1.157556270096463) internal successors, (360), 311 states have internal predecessors, (360), 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) [2021-11-20 22:58:14,312 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 312 states to 312 states and 360 transitions. [2021-11-20 22:58:14,312 INFO L78 Accepts]: Start accepts. Automaton has 312 states and 360 transitions. Word has length 171 [2021-11-20 22:58:14,313 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:58:14,313 INFO L470 AbstractCegarLoop]: Abstraction has 312 states and 360 transitions. [2021-11-20 22:58:14,313 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 83 states, 83 states have (on average 2.8433734939759034) internal successors, (236), 82 states have internal predecessors, (236), 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) [2021-11-20 22:58:14,313 INFO L276 IsEmpty]: Start isEmpty. Operand 312 states and 360 transitions. [2021-11-20 22:58:14,314 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 174 [2021-11-20 22:58:14,314 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:58:14,314 INFO L514 BasicCegarLoop]: trace histogram [24, 24, 24, 24, 24, 24, 23, 1, 1, 1, 1, 1, 1] [2021-11-20 22:58:14,348 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Ended with exit code 0 [2021-11-20 22:58:14,528 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 53 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable58 [2021-11-20 22:58:14,528 INFO L402 AbstractCegarLoop]: === Iteration 60 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-20 22:58:14,528 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:58:14,529 INFO L85 PathProgramCache]: Analyzing trace with hash -1767792665, now seen corresponding path program 17 times [2021-11-20 22:58:14,529 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:58:14,529 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [176068433] [2021-11-20 22:58:14,529 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:58:14,529 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:58:14,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:58:15,802 INFO L134 CoverageAnalysis]: Checked inductivity of 1980 backedges. 484 proven. 1496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:58:15,802 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:58:15,802 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [176068433] [2021-11-20 22:58:15,802 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [176068433] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 22:58:15,802 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [95323314] [2021-11-20 22:58:15,802 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 22:58:15,802 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:58:15,802 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 22:58:15,803 INFO L229 MonitoredProcess]: Starting monitored process 54 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 22:58:15,805 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (54)] Waiting until timeout for monitored process [2021-11-20 22:58:17,919 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 25 check-sat command(s) [2021-11-20 22:58:17,919 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 22:58:17,927 INFO L263 TraceCheckSpWp]: Trace formula consists of 740 conjuncts, 114 conjunts are in the unsatisfiable core [2021-11-20 22:58:17,930 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:58:17,935 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 [2021-11-20 22:58:20,795 INFO L134 CoverageAnalysis]: Checked inductivity of 1980 backedges. 529 proven. 1451 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:58:20,795 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:58:24,816 INFO L134 CoverageAnalysis]: Checked inductivity of 1980 backedges. 576 proven. 1404 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:58:24,816 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [95323314] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:58:24,816 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1758510306] [2021-11-20 22:58:24,817 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-20 22:58:24,817 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 22:58:24,817 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 22:58:24,817 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 22:58:24,817 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 22:58:24,828 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 [2021-11-20 22:58:24,937 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 23 treesize of output 19 [2021-11-20 22:58:25,038 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:58:25,039 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 144 treesize of output 136 [2021-11-20 22:58:25,290 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 23 treesize of output 19 [2021-11-20 22:58:25,405 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 23 treesize of output 19 [2021-11-20 22:58:25,710 INFO L354 Elim1Store]: treesize reduction 28, result has 33.3 percent of original size [2021-11-20 22:58:25,710 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 139 treesize of output 135 [2021-11-20 22:58:28,736 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 11 treesize of output 7 [2021-11-20 22:58:31,370 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 11 treesize of output 7 [2021-11-20 22:58:33,318 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 11 treesize of output 7 [2021-11-20 22:58:35,949 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 11 treesize of output 7 [2021-11-20 22:58:39,001 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 22:58:41,067 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 22:58:41,067 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 22:58:41,067 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 51, 51] total 152 [2021-11-20 22:58:41,068 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1624511640] [2021-11-20 22:58:41,068 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 22:58:41,068 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 154 states [2021-11-20 22:58:41,068 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:58:41,069 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 154 interpolants. [2021-11-20 22:58:41,070 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3369, Invalid=23037, Unknown=0, NotChecked=0, Total=26406 [2021-11-20 22:58:41,070 INFO L87 Difference]: Start difference. First operand 312 states and 360 transitions. Second operand has 154 states, 153 states have (on average 3.392156862745098) internal successors, (519), 153 states have internal predecessors, (519), 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) [2021-11-20 22:58:43,665 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:58:43,665 INFO L93 Difference]: Finished difference Result 334 states and 386 transitions. [2021-11-20 22:58:43,665 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2021-11-20 22:58:43,665 INFO L78 Accepts]: Start accepts. Automaton has has 154 states, 153 states have (on average 3.392156862745098) internal successors, (519), 153 states have internal predecessors, (519), 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 173 [2021-11-20 22:58:43,666 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:58:43,667 INFO L225 Difference]: With dead ends: 334 [2021-11-20 22:58:43,667 INFO L226 Difference]: Without dead ends: 334 [2021-11-20 22:58:43,668 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 594 GetRequests, 406 SyntacticMatches, 0 SemanticMatches, 188 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12260 ImplicationChecksByTransitivity, 9.5s TimeCoverageRelationStatistics Valid=6195, Invalid=29715, Unknown=0, NotChecked=0, Total=35910 [2021-11-20 22:58:43,668 INFO L933 BasicCegarLoop]: 75 mSDtfsCounter, 1848 mSDsluCounter, 1503 mSDsCounter, 0 mSdLazyCounter, 2990 mSolverCounterSat, 245 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1848 SdHoareTripleChecker+Valid, 1578 SdHoareTripleChecker+Invalid, 3235 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 245 IncrementalHoareTripleChecker+Valid, 2990 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2021-11-20 22:58:43,668 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1848 Valid, 1578 Invalid, 3235 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [245 Valid, 2990 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2021-11-20 22:58:43,669 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 334 states. [2021-11-20 22:58:43,671 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 334 to 323. [2021-11-20 22:58:43,671 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 323 states, 322 states have (on average 1.1583850931677018) internal successors, (373), 322 states have internal predecessors, (373), 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) [2021-11-20 22:58:43,671 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 323 states to 323 states and 373 transitions. [2021-11-20 22:58:43,671 INFO L78 Accepts]: Start accepts. Automaton has 323 states and 373 transitions. Word has length 173 [2021-11-20 22:58:43,672 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:58:43,672 INFO L470 AbstractCegarLoop]: Abstraction has 323 states and 373 transitions. [2021-11-20 22:58:43,672 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 154 states, 153 states have (on average 3.392156862745098) internal successors, (519), 153 states have internal predecessors, (519), 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) [2021-11-20 22:58:43,672 INFO L276 IsEmpty]: Start isEmpty. Operand 323 states and 373 transitions. [2021-11-20 22:58:43,673 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 179 [2021-11-20 22:58:43,673 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:58:43,673 INFO L514 BasicCegarLoop]: trace histogram [25, 25, 25, 25, 24, 24, 24, 1, 1, 1, 1, 1, 1] [2021-11-20 22:58:43,694 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (54)] Forceful destruction successful, exit code 0 [2021-11-20 22:58:43,873 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 54 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable59 [2021-11-20 22:58:43,873 INFO L402 AbstractCegarLoop]: === Iteration 61 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-20 22:58:43,874 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:58:43,874 INFO L85 PathProgramCache]: Analyzing trace with hash 1102299133, now seen corresponding path program 18 times [2021-11-20 22:58:43,874 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:58:43,874 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [306613524] [2021-11-20 22:58:43,874 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:58:43,874 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:58:43,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:58:45,590 INFO L134 CoverageAnalysis]: Checked inductivity of 2101 backedges. 97 proven. 2004 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:58:45,590 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:58:45,590 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [306613524] [2021-11-20 22:58:45,590 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [306613524] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 22:58:45,590 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1529675670] [2021-11-20 22:58:45,590 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 22:58:45,591 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:58:45,591 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 22:58:45,591 INFO L229 MonitoredProcess]: Starting monitored process 55 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 22:58:45,592 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0c42b9e-8dee-4b83-8a12-12369b763c15/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Waiting until timeout for monitored process [2021-11-20 22:58:46,043 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 22:58:46,043 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 22:58:46,049 INFO L263 TraceCheckSpWp]: Trace formula consists of 758 conjuncts, 166 conjunts are in the unsatisfiable core [2021-11-20 22:58:46,051 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:58:47,304 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 21 treesize of output 17 [2021-11-20 22:58:47,429 INFO L354 Elim1Store]: treesize reduction 26, result has 27.8 percent of original size [2021-11-20 22:58:47,429 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 28 treesize of output 27 [2021-11-20 22:58:47,717 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2021-11-20 22:58:47,724 INFO L134 CoverageAnalysis]: Checked inductivity of 2101 backedges. 97 proven. 2004 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:58:47,724 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:58:48,083 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-20 22:58:48,085 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 22 [2021-11-20 22:58:48,410 INFO L134 CoverageAnalysis]: Checked inductivity of 2101 backedges. 97 proven. 2004 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:58:48,410 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1529675670] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:58:48,410 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1693832471] [2021-11-20 22:58:48,411 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-20 22:58:48,411 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 22:58:48,411 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 22:58:48,411 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 22:58:48,411 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 22:58:48,442 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 [2021-11-20 22:58:48,517 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 23 treesize of output 19 [2021-11-20 22:58:48,644 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:58:48,645 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 144 treesize of output 136 [2021-11-20 22:58:48,916 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 23 treesize of output 19 [2021-11-20 22:58:49,008 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 23 treesize of output 19 [2021-11-20 22:58:49,277 INFO L354 Elim1Store]: treesize reduction 28, result has 33.3 percent of original size [2021-11-20 22:58:49,277 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 139 treesize of output 135 [2021-11-20 22:58:52,085 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 11 treesize of output 7 [2021-11-20 22:58:54,775 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 11 treesize of output 7 [2021-11-20 22:58:56,708 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 11 treesize of output 7 [2021-11-20 22:58:59,057 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 11 treesize of output 7