./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-patterns/array2_pattern.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 53f42b1a Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c04b9c58-b7d1-40d0-99e9-0a5735db730a/bin/utaipan-TEXQjIfE4P/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c04b9c58-b7d1-40d0-99e9-0a5735db730a/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_c04b9c58-b7d1-40d0-99e9-0a5735db730a/bin/utaipan-TEXQjIfE4P/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c04b9c58-b7d1-40d0-99e9-0a5735db730a/bin/utaipan-TEXQjIfE4P/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-patterns/array2_pattern.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c04b9c58-b7d1-40d0-99e9-0a5735db730a/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c04b9c58-b7d1-40d0-99e9-0a5735db730a/bin/utaipan-TEXQjIfE4P --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 1a25becec148beba97bef86c2a84619bb26dfafe7c127e8d70246837f0d2d470 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-53f42b1 [2021-11-21 01:58:31,699 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-21 01:58:31,702 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-21 01:58:31,744 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-21 01:58:31,745 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-21 01:58:31,746 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-21 01:58:31,748 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-21 01:58:31,750 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-21 01:58:31,752 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-21 01:58:31,754 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-21 01:58:31,755 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-21 01:58:31,756 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-21 01:58:31,757 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-21 01:58:31,758 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-21 01:58:31,760 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-21 01:58:31,761 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-21 01:58:31,762 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-21 01:58:31,764 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-21 01:58:31,766 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-21 01:58:31,768 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-21 01:58:31,771 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-21 01:58:31,772 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-21 01:58:31,774 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-21 01:58:31,775 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-21 01:58:31,782 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-21 01:58:31,783 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-21 01:58:31,791 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-21 01:58:31,792 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-21 01:58:31,793 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-21 01:58:31,794 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-21 01:58:31,794 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-21 01:58:31,795 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-21 01:58:31,796 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-21 01:58:31,797 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-21 01:58:31,798 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-21 01:58:31,798 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-21 01:58:31,799 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-21 01:58:31,799 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-21 01:58:31,800 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-21 01:58:31,801 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-21 01:58:31,802 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-21 01:58:31,807 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c04b9c58-b7d1-40d0-99e9-0a5735db730a/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-21 01:58:31,851 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-21 01:58:31,851 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-21 01:58:31,851 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-21 01:58:31,851 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-21 01:58:31,852 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-21 01:58:31,852 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-21 01:58:31,852 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-21 01:58:31,853 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-21 01:58:31,853 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-21 01:58:31,853 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-21 01:58:31,853 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-21 01:58:31,853 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-21 01:58:31,854 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-21 01:58:31,854 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-21 01:58:31,854 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-21 01:58:31,854 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-21 01:58:31,854 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-21 01:58:31,854 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-21 01:58:31,855 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-21 01:58:31,855 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-21 01:58:31,856 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-21 01:58:31,856 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-21 01:58:31,856 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-21 01:58:31,856 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-21 01:58:31,856 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-21 01:58:31,856 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-21 01:58:31,857 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-21 01:58:31,857 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-21 01:58:31,857 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-21 01:58:31,857 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-21 01:58:31,857 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-21 01:58:31,858 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-21 01:58:31,858 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 01:58:31,858 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-21 01:58:31,858 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-21 01:58:31,858 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-21 01:58:31,859 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-21 01:58:31,859 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-21 01:58:31,859 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-21 01:58:31,859 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-21 01:58:31,859 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-21 01:58:31,860 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_c04b9c58-b7d1-40d0-99e9-0a5735db730a/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c04b9c58-b7d1-40d0-99e9-0a5735db730a/bin/utaipan-TEXQjIfE4P Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 1a25becec148beba97bef86c2a84619bb26dfafe7c127e8d70246837f0d2d470 [2021-11-21 01:58:32,164 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-21 01:58:32,191 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-21 01:58:32,194 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-21 01:58:32,195 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-21 01:58:32,197 INFO L275 PluginConnector]: CDTParser initialized [2021-11-21 01:58:32,198 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c04b9c58-b7d1-40d0-99e9-0a5735db730a/bin/utaipan-TEXQjIfE4P/../../sv-benchmarks/c/array-patterns/array2_pattern.c [2021-11-21 01:58:32,282 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c04b9c58-b7d1-40d0-99e9-0a5735db730a/bin/utaipan-TEXQjIfE4P/data/899f1db40/317c5108a1014189bd7a41e839478436/FLAG77d9907e6 [2021-11-21 01:58:32,660 INFO L306 CDTParser]: Found 1 translation units. [2021-11-21 01:58:32,660 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c04b9c58-b7d1-40d0-99e9-0a5735db730a/sv-benchmarks/c/array-patterns/array2_pattern.c [2021-11-21 01:58:32,667 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c04b9c58-b7d1-40d0-99e9-0a5735db730a/bin/utaipan-TEXQjIfE4P/data/899f1db40/317c5108a1014189bd7a41e839478436/FLAG77d9907e6 [2021-11-21 01:58:33,061 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c04b9c58-b7d1-40d0-99e9-0a5735db730a/bin/utaipan-TEXQjIfE4P/data/899f1db40/317c5108a1014189bd7a41e839478436 [2021-11-21 01:58:33,064 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-21 01:58:33,065 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-21 01:58:33,075 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-21 01:58:33,076 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-21 01:58:33,079 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-21 01:58:33,080 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 01:58:33" (1/1) ... [2021-11-21 01:58:33,081 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@73f45ba4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:58:33, skipping insertion in model container [2021-11-21 01:58:33,082 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 01:58:33" (1/1) ... [2021-11-21 01:58:33,100 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-21 01:58:33,117 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-21 01:58:33,293 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c04b9c58-b7d1-40d0-99e9-0a5735db730a/sv-benchmarks/c/array-patterns/array2_pattern.c[1322,1335] [2021-11-21 01:58:33,316 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 01:58:33,332 INFO L203 MainTranslator]: Completed pre-run [2021-11-21 01:58:33,350 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c04b9c58-b7d1-40d0-99e9-0a5735db730a/sv-benchmarks/c/array-patterns/array2_pattern.c[1322,1335] [2021-11-21 01:58:33,377 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 01:58:33,398 INFO L208 MainTranslator]: Completed translation [2021-11-21 01:58:33,398 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:58:33 WrapperNode [2021-11-21 01:58:33,398 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-21 01:58:33,400 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-21 01:58:33,400 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-21 01:58:33,400 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-21 01:58:33,407 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:58:33" (1/1) ... [2021-11-21 01:58:33,423 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:58:33" (1/1) ... [2021-11-21 01:58:33,454 INFO L137 Inliner]: procedures = 16, calls = 24, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 80 [2021-11-21 01:58:33,455 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-21 01:58:33,456 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-21 01:58:33,456 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-21 01:58:33,456 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-21 01:58:33,464 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:58:33" (1/1) ... [2021-11-21 01:58:33,465 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:58:33" (1/1) ... [2021-11-21 01:58:33,471 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:58:33" (1/1) ... [2021-11-21 01:58:33,471 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:58:33" (1/1) ... [2021-11-21 01:58:33,489 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:58:33" (1/1) ... [2021-11-21 01:58:33,494 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:58:33" (1/1) ... [2021-11-21 01:58:33,501 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:58:33" (1/1) ... [2021-11-21 01:58:33,506 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-21 01:58:33,509 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-21 01:58:33,509 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-21 01:58:33,509 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-21 01:58:33,510 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:58:33" (1/1) ... [2021-11-21 01:58:33,518 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 01:58:33,531 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c04b9c58-b7d1-40d0-99e9-0a5735db730a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:58:33,553 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c04b9c58-b7d1-40d0-99e9-0a5735db730a/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-21 01:58:33,576 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c04b9c58-b7d1-40d0-99e9-0a5735db730a/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-21 01:58:33,599 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-21 01:58:33,600 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-11-21 01:58:33,600 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-11-21 01:58:33,600 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-21 01:58:33,600 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-21 01:58:33,600 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-21 01:58:33,601 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-21 01:58:33,601 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-21 01:58:33,601 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-21 01:58:33,601 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-21 01:58:33,667 INFO L236 CfgBuilder]: Building ICFG [2021-11-21 01:58:33,669 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-21 01:58:33,807 INFO L277 CfgBuilder]: Performing block encoding [2021-11-21 01:58:33,833 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-21 01:58:33,833 INFO L301 CfgBuilder]: Removed 3 assume(true) statements. [2021-11-21 01:58:33,836 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 01:58:33 BoogieIcfgContainer [2021-11-21 01:58:33,836 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-21 01:58:33,838 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-21 01:58:33,838 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-21 01:58:33,841 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-21 01:58:33,841 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.11 01:58:33" (1/3) ... [2021-11-21 01:58:33,842 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@34341247 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 01:58:33, skipping insertion in model container [2021-11-21 01:58:33,842 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:58:33" (2/3) ... [2021-11-21 01:58:33,843 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@34341247 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 01:58:33, skipping insertion in model container [2021-11-21 01:58:33,843 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 01:58:33" (3/3) ... [2021-11-21 01:58:33,844 INFO L111 eAbstractionObserver]: Analyzing ICFG array2_pattern.c [2021-11-21 01:58:33,849 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-21 01:58:33,849 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-21 01:58:33,892 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-21 01:58:33,900 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=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-21 01:58:33,900 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-21 01:58:33,915 INFO L276 IsEmpty]: Start isEmpty. Operand has 17 states, 12 states have (on average 1.5) internal successors, (18), 13 states have internal predecessors, (18), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-21 01:58:33,919 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-21 01:58:33,919 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:58:33,920 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:58:33,921 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:58:33,926 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:58:33,926 INFO L85 PathProgramCache]: Analyzing trace with hash -348000308, now seen corresponding path program 1 times [2021-11-21 01:58:33,935 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:58:33,936 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1695918227] [2021-11-21 01:58:33,936 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:58:33,937 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:58:34,035 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:58:34,086 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:58:34,086 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:58:34,087 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1695918227] [2021-11-21 01:58:34,087 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1695918227] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:58:34,088 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:58:34,088 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-21 01:58:34,089 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [284369464] [2021-11-21 01:58:34,090 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:58:34,094 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-21 01:58:34,094 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:58:34,120 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-21 01:58:34,120 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-21 01:58:34,122 INFO L87 Difference]: Start difference. First operand has 17 states, 12 states have (on average 1.5) internal successors, (18), 13 states have internal predecessors, (18), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Second operand has 2 states, 2 states have (on average 4.5) internal successors, (9), 2 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-21 01:58:34,154 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:58:34,154 INFO L93 Difference]: Finished difference Result 24 states and 30 transitions. [2021-11-21 01:58:34,156 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-21 01:58:34,157 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 4.5) internal successors, (9), 2 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2021-11-21 01:58:34,158 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:58:34,164 INFO L225 Difference]: With dead ends: 24 [2021-11-21 01:58:34,165 INFO L226 Difference]: Without dead ends: 15 [2021-11-21 01:58:34,167 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-21 01:58:34,172 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 7 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 7 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 7 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 01:58:34,173 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 13 Invalid, 7 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 7 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 01:58:34,189 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2021-11-21 01:58:34,204 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2021-11-21 01:58:34,205 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 11 states have internal predecessors, (14), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-21 01:58:34,206 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 18 transitions. [2021-11-21 01:58:34,207 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 18 transitions. Word has length 11 [2021-11-21 01:58:34,208 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:58:34,209 INFO L470 AbstractCegarLoop]: Abstraction has 15 states and 18 transitions. [2021-11-21 01:58:34,209 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 4.5) internal successors, (9), 2 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-21 01:58:34,209 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 18 transitions. [2021-11-21 01:58:34,210 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-11-21 01:58:34,210 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:58:34,211 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:58:34,211 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-21 01:58:34,211 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:58:34,212 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:58:34,212 INFO L85 PathProgramCache]: Analyzing trace with hash 1400754714, now seen corresponding path program 1 times [2021-11-21 01:58:34,213 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:58:34,213 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1052567040] [2021-11-21 01:58:34,213 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:58:34,213 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:58:34,235 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:58:34,235 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1116226232] [2021-11-21 01:58:34,236 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:58:34,236 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:58:34,236 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c04b9c58-b7d1-40d0-99e9-0a5735db730a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:58:34,238 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c04b9c58-b7d1-40d0-99e9-0a5735db730a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:58:34,279 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c04b9c58-b7d1-40d0-99e9-0a5735db730a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-21 01:58:34,389 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:58:34,391 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-21 01:58:34,396 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:58:34,533 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-21 01:58:34,534 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 01:58:34,534 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:58:34,534 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1052567040] [2021-11-21 01:58:34,534 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:58:34,535 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1116226232] [2021-11-21 01:58:34,535 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1116226232] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:58:34,535 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:58:34,535 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-21 01:58:34,536 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [382068145] [2021-11-21 01:58:34,537 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:58:34,537 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 01:58:34,538 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:58:34,538 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 01:58:34,539 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-21 01:58:34,539 INFO L87 Difference]: Start difference. First operand 15 states and 18 transitions. Second operand has 4 states, 4 states have (on average 2.75) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-21 01:58:34,586 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:58:34,587 INFO L93 Difference]: Finished difference Result 19 states and 22 transitions. [2021-11-21 01:58:34,588 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 01:58:34,589 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 16 [2021-11-21 01:58:34,590 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:58:34,592 INFO L225 Difference]: With dead ends: 19 [2021-11-21 01:58:34,597 INFO L226 Difference]: Without dead ends: 16 [2021-11-21 01:58:34,597 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-21 01:58:34,600 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 3 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 17 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 17 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 17 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 01:58:34,601 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 28 Invalid, 17 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 17 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 01:58:34,603 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2021-11-21 01:58:34,607 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2021-11-21 01:58:34,608 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 12 states have (on average 1.25) internal successors, (15), 12 states have internal predecessors, (15), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-21 01:58:34,609 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 19 transitions. [2021-11-21 01:58:34,609 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 19 transitions. Word has length 16 [2021-11-21 01:58:34,609 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:58:34,610 INFO L470 AbstractCegarLoop]: Abstraction has 16 states and 19 transitions. [2021-11-21 01:58:34,610 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-21 01:58:34,610 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 19 transitions. [2021-11-21 01:58:34,611 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-11-21 01:58:34,612 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:58:34,613 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:58:34,647 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c04b9c58-b7d1-40d0-99e9-0a5735db730a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-21 01:58:34,839 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c04b9c58-b7d1-40d0-99e9-0a5735db730a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:58:34,839 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:58:34,840 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:58:34,840 INFO L85 PathProgramCache]: Analyzing trace with hash 473487722, now seen corresponding path program 1 times [2021-11-21 01:58:34,840 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:58:34,841 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2134365781] [2021-11-21 01:58:34,841 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:58:34,841 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:58:34,861 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:58:34,866 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1972914167] [2021-11-21 01:58:34,867 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:58:34,867 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:58:34,867 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c04b9c58-b7d1-40d0-99e9-0a5735db730a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:58:34,868 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c04b9c58-b7d1-40d0-99e9-0a5735db730a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:58:34,876 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c04b9c58-b7d1-40d0-99e9-0a5735db730a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-21 01:58:34,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:58:34,939 INFO L263 TraceCheckSpWp]: Trace formula consists of 90 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-21 01:58:34,941 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:58:35,041 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:58:35,043 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 01:58:35,044 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:58:35,044 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2134365781] [2021-11-21 01:58:35,044 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:58:35,044 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1972914167] [2021-11-21 01:58:35,045 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1972914167] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:58:35,045 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:58:35,049 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-21 01:58:35,049 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1044345836] [2021-11-21 01:58:35,049 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:58:35,050 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-21 01:58:35,050 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:58:35,051 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-21 01:58:35,051 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-21 01:58:35,052 INFO L87 Difference]: Start difference. First operand 16 states and 19 transitions. Second operand has 5 states, 5 states have (on average 2.6) internal successors, (13), 5 states have internal predecessors, (13), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-21 01:58:35,128 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:58:35,129 INFO L93 Difference]: Finished difference Result 29 states and 34 transitions. [2021-11-21 01:58:35,129 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-21 01:58:35,131 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.6) internal successors, (13), 5 states have internal predecessors, (13), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 17 [2021-11-21 01:58:35,132 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:58:35,132 INFO L225 Difference]: With dead ends: 29 [2021-11-21 01:58:35,132 INFO L226 Difference]: Without dead ends: 17 [2021-11-21 01:58:35,134 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-11-21 01:58:35,138 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 7 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 29 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 32 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 29 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 01:58:35,141 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7 Valid, 34 Invalid, 32 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 29 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 01:58:35,143 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2021-11-21 01:58:35,153 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2021-11-21 01:58:35,154 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 13 states have internal predecessors, (16), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-21 01:58:35,156 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 20 transitions. [2021-11-21 01:58:35,156 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 20 transitions. Word has length 17 [2021-11-21 01:58:35,157 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:58:35,157 INFO L470 AbstractCegarLoop]: Abstraction has 17 states and 20 transitions. [2021-11-21 01:58:35,157 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.6) internal successors, (13), 5 states have internal predecessors, (13), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-21 01:58:35,157 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 20 transitions. [2021-11-21 01:58:35,159 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-11-21 01:58:35,159 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:58:35,159 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:58:35,197 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c04b9c58-b7d1-40d0-99e9-0a5735db730a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-21 01:58:35,379 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c04b9c58-b7d1-40d0-99e9-0a5735db730a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:58:35,379 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:58:35,380 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:58:35,380 INFO L85 PathProgramCache]: Analyzing trace with hash 199414858, now seen corresponding path program 1 times [2021-11-21 01:58:35,380 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:58:35,380 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2135417242] [2021-11-21 01:58:35,381 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:58:35,381 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:58:35,407 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:58:35,413 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1491781571] [2021-11-21 01:58:35,414 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:58:35,414 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:58:35,417 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c04b9c58-b7d1-40d0-99e9-0a5735db730a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:58:35,418 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c04b9c58-b7d1-40d0-99e9-0a5735db730a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:58:35,420 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c04b9c58-b7d1-40d0-99e9-0a5735db730a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-21 01:58:35,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:58:35,489 INFO L263 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-21 01:58:35,491 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:58:35,548 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 10 treesize of output 8 [2021-11-21 01:58:35,599 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 27 treesize of output 15 [2021-11-21 01:58:36,031 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:36,116 INFO L354 Elim1Store]: treesize reduction 393, result has 10.9 percent of original size [2021-11-21 01:58:36,117 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 5 select indices, 5 select index equivalence classes, 1 disjoint index pairs (out of 10 index pairs), introduced 7 new quantified variables, introduced 10 case distinctions, treesize of input 219 treesize of output 163 [2021-11-21 01:58:36,155 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-21 01:58:36,232 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:36,234 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:36,237 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:58:36,241 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 118 treesize of output 67 [2021-11-21 01:58:36,661 INFO L354 Elim1Store]: treesize reduction 87, result has 7.4 percent of original size [2021-11-21 01:58:36,662 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 54 treesize of output 33 [2021-11-21 01:58:36,703 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:58:36,703 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:58:41,547 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:58:41,547 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2135417242] [2021-11-21 01:58:41,547 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:58:41,547 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1491781571] [2021-11-21 01:58:41,547 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1491781571] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:58:41,547 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1738249786] [2021-11-21 01:58:41,566 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-21 01:58:41,567 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:58:41,571 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:58:41,577 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:58:41,577 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:58:41,937 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:41,940 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:41,945 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:42,013 INFO L354 Elim1Store]: treesize reduction 98, result has 24.6 percent of original size [2021-11-21 01:58:42,013 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 10 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 9 case distinctions, treesize of input 44 treesize of output 69 [2021-11-21 01:58:42,066 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:42,067 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:42,068 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:42,071 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 2 stores, 3 select indices, 3 select index equivalence classes, 12 disjoint index pairs (out of 3 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 67 treesize of output 99 [2021-11-21 01:58:42,118 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:42,119 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:42,121 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 5 select indices, 5 select index equivalence classes, 11 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 44 treesize of output 34 [2021-11-21 01:58:42,301 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:42,303 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:42,304 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 7 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 57 treesize of output 45 [2021-11-21 01:58:42,483 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:42,484 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:42,487 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:42,488 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:42,490 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:42,491 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:42,492 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:58:42,495 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:42,497 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:58:42,549 INFO L354 Elim1Store]: treesize reduction 142, result has 12.3 percent of original size [2021-11-21 01:58:42,550 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 7 case distinctions, treesize of input 323 treesize of output 309 [2021-11-21 01:58:43,066 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:58:43,081 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-21 01:58:43,083 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 42 treesize of output 25 [2021-11-21 01:58:43,591 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:58:43,593 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:58:43,597 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-21 01:58:43,696 INFO L354 Elim1Store]: treesize reduction 85, result has 55.5 percent of original size [2021-11-21 01:58:43,696 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 4 new quantified variables, introduced 5 case distinctions, treesize of input 232 treesize of output 209 [2021-11-21 01:58:43,769 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:58:43,770 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 1 new quantified variables, introduced 0 case distinctions, treesize of input 92 treesize of output 69 [2021-11-21 01:58:43,892 INFO L354 Elim1Store]: treesize reduction 26, result has 3.7 percent of original size [2021-11-21 01:58:43,892 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 94 treesize of output 56 [2021-11-21 01:58:44,805 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 20 for LOIs [2021-11-21 01:58:44,830 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:58:45,857 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:58:45,858 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-21 01:58:45,858 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2021-11-21 01:58:45,858 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1160773115] [2021-11-21 01:58:45,858 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-21 01:58:45,859 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-21 01:58:45,859 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:58:45,859 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-21 01:58:45,861 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=705, Unknown=2, NotChecked=0, Total=812 [2021-11-21 01:58:45,862 INFO L87 Difference]: Start difference. First operand 17 states and 20 transitions. Second operand has 12 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 10 states have internal predecessors, (14), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-21 01:58:46,024 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:58:46,025 INFO L93 Difference]: Finished difference Result 32 states and 38 transitions. [2021-11-21 01:58:46,026 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-21 01:58:46,026 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 10 states have internal predecessors, (14), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 18 [2021-11-21 01:58:46,027 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:58:46,028 INFO L225 Difference]: With dead ends: 32 [2021-11-21 01:58:46,029 INFO L226 Difference]: Without dead ends: 29 [2021-11-21 01:58:46,030 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 16 SyntacticMatches, 1 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 230 ImplicationChecksByTransitivity, 5.8s TimeCoverageRelationStatistics Valid=129, Invalid=799, Unknown=2, NotChecked=0, Total=930 [2021-11-21 01:58:46,030 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 15 mSDsluCounter, 74 mSDsCounter, 0 mSdLazyCounter, 30 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 79 SdHoareTripleChecker+Invalid, 74 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 30 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 40 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:58:46,031 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 79 Invalid, 74 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 30 Invalid, 0 Unknown, 40 Unchecked, 0.1s Time] [2021-11-21 01:58:46,032 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2021-11-21 01:58:46,037 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 26. [2021-11-21 01:58:46,037 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 20 states have (on average 1.25) internal successors, (25), 20 states have internal predecessors, (25), 3 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-21 01:58:46,038 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 31 transitions. [2021-11-21 01:58:46,038 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 31 transitions. Word has length 18 [2021-11-21 01:58:46,038 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:58:46,039 INFO L470 AbstractCegarLoop]: Abstraction has 26 states and 31 transitions. [2021-11-21 01:58:46,039 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 10 states have internal predecessors, (14), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-21 01:58:46,039 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 31 transitions. [2021-11-21 01:58:46,040 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-11-21 01:58:46,040 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:58:46,040 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:58:46,078 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c04b9c58-b7d1-40d0-99e9-0a5735db730a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-21 01:58:46,255 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c04b9c58-b7d1-40d0-99e9-0a5735db730a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:58:46,255 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:58:46,256 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:58:46,256 INFO L85 PathProgramCache]: Analyzing trace with hash 1886657850, now seen corresponding path program 2 times [2021-11-21 01:58:46,256 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:58:46,256 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [373207461] [2021-11-21 01:58:46,256 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:58:46,256 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:58:46,285 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:58:46,286 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1622800988] [2021-11-21 01:58:46,286 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:58:46,286 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:58:46,286 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c04b9c58-b7d1-40d0-99e9-0a5735db730a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:58:46,298 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c04b9c58-b7d1-40d0-99e9-0a5735db730a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:58:46,310 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c04b9c58-b7d1-40d0-99e9-0a5735db730a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-21 01:58:46,392 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-21 01:58:46,392 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:58:46,394 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-21 01:58:46,395 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:58:46,470 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 5 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:58:46,470 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:58:46,531 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-21 01:58:46,531 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:58:46,531 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [373207461] [2021-11-21 01:58:46,531 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:58:46,531 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1622800988] [2021-11-21 01:58:46,532 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1622800988] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:58:46,532 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1461993972] [2021-11-21 01:58:46,534 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-21 01:58:46,534 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:58:46,535 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:58:46,535 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:58:46,535 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:58:46,788 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:46,789 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:46,792 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:46,921 INFO L354 Elim1Store]: treesize reduction 170, result has 28.9 percent of original size [2021-11-21 01:58:46,921 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 2 stores, 3 select indices, 3 select index equivalence classes, 8 disjoint index pairs (out of 3 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 67 treesize of output 127 [2021-11-21 01:58:46,993 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-21 01:58:47,035 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-21 01:58:47,174 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-21 01:58:47,213 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-21 01:58:47,879 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:47,881 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:47,934 INFO L354 Elim1Store]: treesize reduction 8, result has 80.5 percent of original size [2021-11-21 01:58:47,935 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 5 case distinctions, treesize of input 287 treesize of output 295 [2021-11-21 01:58:48,209 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:48,213 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:48,216 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:48,296 INFO L354 Elim1Store]: treesize reduction 98, result has 24.6 percent of original size [2021-11-21 01:58:48,296 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 10 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 9 case distinctions, treesize of input 44 treesize of output 69 [2021-11-21 01:58:48,446 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:48,448 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:48,451 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 8 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 57 treesize of output 45 [2021-11-21 01:58:48,686 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:48,688 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:48,695 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:48,696 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:48,698 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:48,699 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:48,700 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:58:48,704 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:48,705 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:58:48,763 INFO L354 Elim1Store]: treesize reduction 142, result has 12.3 percent of original size [2021-11-21 01:58:48,764 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 7 case distinctions, treesize of input 323 treesize of output 309 [2021-11-21 01:58:49,176 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:58:49,188 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-21 01:58:49,188 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 42 treesize of output 25 [2021-11-21 01:58:49,724 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:58:49,725 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:58:49,728 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-21 01:58:49,807 INFO L354 Elim1Store]: treesize reduction 85, result has 55.5 percent of original size [2021-11-21 01:58:49,807 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 4 new quantified variables, introduced 5 case distinctions, treesize of input 232 treesize of output 209 [2021-11-21 01:58:49,946 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:58:49,947 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 1 new quantified variables, introduced 0 case distinctions, treesize of input 69 treesize of output 46 [2021-11-21 01:58:50,064 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 38 treesize of output 23 [2021-11-21 01:58:50,142 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:50,146 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-21 01:58:50,147 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 94 treesize of output 56 [2021-11-21 01:58:50,186 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 94 treesize of output 56 [2021-11-21 01:58:51,001 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 20 for LOIs [2021-11-21 01:58:51,020 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:58:51,592 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:58:51,592 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-21 01:58:51,592 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 9 [2021-11-21 01:58:51,592 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2132904064] [2021-11-21 01:58:51,592 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-21 01:58:51,593 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-21 01:58:51,593 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:58:51,593 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-21 01:58:51,593 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=378, Unknown=0, NotChecked=0, Total=462 [2021-11-21 01:58:51,593 INFO L87 Difference]: Start difference. First operand 26 states and 31 transitions. Second operand has 9 states, 9 states have (on average 2.0) internal successors, (18), 9 states have internal predecessors, (18), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-21 01:58:51,715 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:58:51,716 INFO L93 Difference]: Finished difference Result 35 states and 40 transitions. [2021-11-21 01:58:51,716 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-21 01:58:51,716 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.0) internal successors, (18), 9 states have internal predecessors, (18), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 19 [2021-11-21 01:58:51,717 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:58:51,717 INFO L225 Difference]: With dead ends: 35 [2021-11-21 01:58:51,717 INFO L226 Difference]: Without dead ends: 22 [2021-11-21 01:58:51,718 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 144 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=106, Invalid=494, Unknown=0, NotChecked=0, Total=600 [2021-11-21 01:58:51,719 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 24 mSDsluCounter, 51 mSDsCounter, 0 mSdLazyCounter, 71 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 51 SdHoareTripleChecker+Invalid, 86 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 71 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:58:51,719 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [25 Valid, 51 Invalid, 86 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 71 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:58:51,720 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2021-11-21 01:58:51,722 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 18. [2021-11-21 01:58:51,722 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 14 states have internal predecessors, (17), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-21 01:58:51,723 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 21 transitions. [2021-11-21 01:58:51,723 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 21 transitions. Word has length 19 [2021-11-21 01:58:51,723 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:58:51,723 INFO L470 AbstractCegarLoop]: Abstraction has 18 states and 21 transitions. [2021-11-21 01:58:51,724 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.0) internal successors, (18), 9 states have internal predecessors, (18), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-21 01:58:51,724 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 21 transitions. [2021-11-21 01:58:51,724 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-11-21 01:58:51,724 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:58:51,725 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:58:51,762 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c04b9c58-b7d1-40d0-99e9-0a5735db730a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-21 01:58:51,937 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c04b9c58-b7d1-40d0-99e9-0a5735db730a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:58:51,938 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:58:51,938 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:58:51,938 INFO L85 PathProgramCache]: Analyzing trace with hash 293090666, now seen corresponding path program 3 times [2021-11-21 01:58:51,938 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:58:51,938 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [479904432] [2021-11-21 01:58:51,938 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:58:51,938 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:58:51,964 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:58:51,969 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1712520387] [2021-11-21 01:58:51,969 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:58:51,970 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:58:51,970 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c04b9c58-b7d1-40d0-99e9-0a5735db730a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:58:51,971 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c04b9c58-b7d1-40d0-99e9-0a5735db730a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:58:51,998 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c04b9c58-b7d1-40d0-99e9-0a5735db730a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-21 01:58:52,028 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:58:52,028 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:58:52,029 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-21 01:58:52,030 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:58:52,140 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 3 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:58:52,140 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:58:52,208 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-21 01:58:52,209 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:58:52,209 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [479904432] [2021-11-21 01:58:52,209 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:58:52,209 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1712520387] [2021-11-21 01:58:52,209 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1712520387] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:58:52,209 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1289900770] [2021-11-21 01:58:52,212 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-21 01:58:52,212 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:58:52,212 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:58:52,213 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:58:52,213 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:58:52,473 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:52,474 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:52,477 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:52,588 INFO L354 Elim1Store]: treesize reduction 170, result has 28.9 percent of original size [2021-11-21 01:58:52,588 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 2 stores, 3 select indices, 3 select index equivalence classes, 8 disjoint index pairs (out of 3 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 67 treesize of output 127 [2021-11-21 01:58:52,997 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-21 01:58:53,077 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-21 01:58:53,139 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-21 01:58:53,423 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:53,425 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:53,461 INFO L354 Elim1Store]: treesize reduction 8, result has 80.5 percent of original size [2021-11-21 01:58:53,462 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 5 case distinctions, treesize of input 287 treesize of output 295 [2021-11-21 01:58:53,692 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:53,696 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:53,767 INFO L354 Elim1Store]: treesize reduction 98, result has 24.6 percent of original size [2021-11-21 01:58:53,768 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 10 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 9 case distinctions, treesize of input 44 treesize of output 69 [2021-11-21 01:58:53,901 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:53,902 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:53,907 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 8 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 57 treesize of output 45 [2021-11-21 01:58:54,060 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:54,061 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:54,063 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:54,064 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:54,065 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:54,066 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:54,067 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:58:54,069 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:54,070 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:58:54,101 INFO L354 Elim1Store]: treesize reduction 142, result has 12.3 percent of original size [2021-11-21 01:58:54,102 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 7 case distinctions, treesize of input 323 treesize of output 309 [2021-11-21 01:58:54,511 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:58:54,527 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-21 01:58:54,527 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 42 treesize of output 25 [2021-11-21 01:58:55,071 INFO L354 Elim1Store]: treesize reduction 85, result has 55.5 percent of original size [2021-11-21 01:58:55,071 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 4 new quantified variables, introduced 5 case distinctions, treesize of input 232 treesize of output 209 [2021-11-21 01:58:55,148 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:58:55,149 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 1 new quantified variables, introduced 0 case distinctions, treesize of input 92 treesize of output 69 [2021-11-21 01:58:55,238 INFO L354 Elim1Store]: treesize reduction 26, result has 3.7 percent of original size [2021-11-21 01:58:55,239 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 94 treesize of output 56 [2021-11-21 01:58:55,919 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 20 for LOIs [2021-11-21 01:58:55,937 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:58:56,511 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:58:56,511 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-21 01:58:56,512 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 9 [2021-11-21 01:58:56,512 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [840589105] [2021-11-21 01:58:56,512 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-21 01:58:56,512 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-21 01:58:56,513 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:58:56,513 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-21 01:58:56,514 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=380, Unknown=0, NotChecked=0, Total=462 [2021-11-21 01:58:56,514 INFO L87 Difference]: Start difference. First operand 18 states and 21 transitions. Second operand has 9 states, 9 states have (on average 2.0) internal successors, (18), 9 states have internal predecessors, (18), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-21 01:58:56,607 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:58:56,607 INFO L93 Difference]: Finished difference Result 24 states and 26 transitions. [2021-11-21 01:58:56,608 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-21 01:58:56,608 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.0) internal successors, (18), 9 states have internal predecessors, (18), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 19 [2021-11-21 01:58:56,609 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:58:56,609 INFO L225 Difference]: With dead ends: 24 [2021-11-21 01:58:56,609 INFO L226 Difference]: Without dead ends: 21 [2021-11-21 01:58:56,610 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 151 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=103, Invalid=497, Unknown=0, NotChecked=0, Total=600 [2021-11-21 01:58:56,612 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 20 mSDsluCounter, 26 mSDsCounter, 0 mSdLazyCounter, 49 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 29 SdHoareTripleChecker+Invalid, 63 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 49 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 01:58:56,612 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [20 Valid, 29 Invalid, 63 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 49 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 01:58:56,614 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-11-21 01:58:56,621 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2021-11-21 01:58:56,622 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 16 states have (on average 1.1875) internal successors, (19), 16 states have internal predecessors, (19), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-21 01:58:56,626 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 23 transitions. [2021-11-21 01:58:56,628 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 23 transitions. Word has length 19 [2021-11-21 01:58:56,628 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:58:56,628 INFO L470 AbstractCegarLoop]: Abstraction has 21 states and 23 transitions. [2021-11-21 01:58:56,628 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.0) internal successors, (18), 9 states have internal predecessors, (18), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-21 01:58:56,629 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 23 transitions. [2021-11-21 01:58:56,629 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-21 01:58:56,630 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:58:56,630 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:58:56,672 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c04b9c58-b7d1-40d0-99e9-0a5735db730a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-21 01:58:56,855 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c04b9c58-b7d1-40d0-99e9-0a5735db730a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-11-21 01:58:56,855 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:58:56,856 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:58:56,856 INFO L85 PathProgramCache]: Analyzing trace with hash 495640602, now seen corresponding path program 4 times [2021-11-21 01:58:56,856 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:58:56,856 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [82894595] [2021-11-21 01:58:56,856 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:58:56,856 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:58:56,869 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:58:56,870 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1224138992] [2021-11-21 01:58:56,870 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 01:58:56,870 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:58:56,870 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c04b9c58-b7d1-40d0-99e9-0a5735db730a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:58:56,871 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c04b9c58-b7d1-40d0-99e9-0a5735db730a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:58:56,874 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c04b9c58-b7d1-40d0-99e9-0a5735db730a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-21 01:58:56,962 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:58:56,963 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 36 conjunts are in the unsatisfiable core [2021-11-21 01:58:56,965 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:58:56,982 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 10 treesize of output 8 [2021-11-21 01:58:57,019 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 15 [2021-11-21 01:58:57,071 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:57,072 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:57,073 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 48 treesize of output 39 [2021-11-21 01:58:57,531 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:57,536 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:57,536 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:57,682 INFO L354 Elim1Store]: treesize reduction 566, result has 18.7 percent of original size [2021-11-21 01:58:57,682 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 7 select indices, 7 select index equivalence classes, 3 disjoint index pairs (out of 21 index pairs), introduced 9 new quantified variables, introduced 17 case distinctions, treesize of input 240 treesize of output 254 [2021-11-21 01:58:58,952 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:58,953 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:58,954 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:58,954 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:59,021 INFO L354 Elim1Store]: treesize reduction 95, result has 29.6 percent of original size [2021-11-21 01:58:59,022 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 8 select indices, 8 select index equivalence classes, 5 disjoint index pairs (out of 28 index pairs), introduced 9 new quantified variables, introduced 9 case distinctions, treesize of input 508 treesize of output 393 [2021-11-21 01:59:00,762 INFO L354 Elim1Store]: treesize reduction 101, result has 21.7 percent of original size [2021-11-21 01:59:00,763 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 6 select indices, 6 select index equivalence classes, 1 disjoint index pairs (out of 15 index pairs), introduced 7 new quantified variables, introduced 15 case distinctions, treesize of input 175 treesize of output 129 [2021-11-21 01:59:00,927 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:59:00,928 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:59:04,710 WARN L838 $PredicateComparison]: unable to prove that (forall ((|ULTIMATE.start_main_~index~0#1| Int)) (or (<= c_~ARR_SIZE~0 |ULTIMATE.start_main_~index~0#1|) (let ((.cse9 (mod (+ (* |ULTIMATE.start_main_~index~0#1| 4294967295) 4294967295 c_~ARR_SIZE~0) 4294967296)) (.cse4 (store |c_#memory_int| |c_ULTIMATE.start_main_~#array1~0#1.base| (let ((.cse13 (select |c_#memory_int| |c_ULTIMATE.start_main_~#array1~0#1.base|)) (.cse14 (+ |c_ULTIMATE.start_main_~#array1~0#1.offset| (* |ULTIMATE.start_main_~index~0#1| 4)))) (store .cse13 .cse14 (+ (select .cse13 .cse14) (* (* |c_ULTIMATE.start_main_~num~0#1| |c_ULTIMATE.start_main_~num~0#1|) |ULTIMATE.start_main_~index~0#1|))))))) (let ((.cse3 (+ |c_ULTIMATE.start_main_~#array2~0#1.offset| 4)) (.cse1 (+ |c_ULTIMATE.start_main_~#array1~0#1.offset| 4)) (.cse5 (select .cse4 |c_ULTIMATE.start_main_~#array2~0#1.base|)) (.cse7 (* |c_ULTIMATE.start_main_~num~0#1| |ULTIMATE.start_main_~index~0#1|)) (.cse8 (* .cse9 4))) (and (or (= (let ((.cse2 (let ((.cse6 (+ |c_ULTIMATE.start_main_~#array2~0#1.offset| .cse8))) (store .cse5 .cse6 (+ .cse7 (select .cse5 .cse6)))))) (let ((.cse0 (select (store .cse4 |c_ULTIMATE.start_main_~#array2~0#1.base| .cse2) |c_ULTIMATE.start_main_~#array1~0#1.base|))) (+ (select .cse0 |c_ULTIMATE.start_main_~#array1~0#1.offset|) (select .cse0 .cse1) (select .cse2 .cse3) (select .cse2 |c_ULTIMATE.start_main_~#array2~0#1.offset|) |c_ULTIMATE.start_main_~sum~0#1|))) 0) (< 2147483647 .cse9)) (or (<= .cse9 2147483647) (= (let ((.cse10 (let ((.cse12 (+ |c_ULTIMATE.start_main_~#array2~0#1.offset| (- 17179869184) .cse8))) (store .cse5 .cse12 (+ (select .cse5 .cse12) .cse7))))) (let ((.cse11 (select (store .cse4 |c_ULTIMATE.start_main_~#array2~0#1.base| .cse10) |c_ULTIMATE.start_main_~#array1~0#1.base|))) (+ (select .cse10 .cse3) (select .cse11 |c_ULTIMATE.start_main_~#array1~0#1.offset|) (select .cse11 .cse1) |c_ULTIMATE.start_main_~sum~0#1| (select .cse10 |c_ULTIMATE.start_main_~#array2~0#1.offset|)))) 0))))) (< |ULTIMATE.start_main_~index~0#1| 0))) is different from false [2021-11-21 01:59:04,745 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:59:04,745 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [82894595] [2021-11-21 01:59:04,745 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:59:04,746 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1224138992] [2021-11-21 01:59:04,746 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1224138992] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:59:04,746 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2029062320] [2021-11-21 01:59:04,748 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-21 01:59:04,748 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:59:04,749 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:59:04,749 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:59:04,749 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:59:05,012 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:05,014 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:05,060 INFO L354 Elim1Store]: treesize reduction 98, result has 24.6 percent of original size [2021-11-21 01:59:05,061 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 10 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 9 case distinctions, treesize of input 44 treesize of output 69 [2021-11-21 01:59:05,125 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:05,126 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:05,127 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:05,128 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 2 stores, 3 select indices, 3 select index equivalence classes, 11 disjoint index pairs (out of 3 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 67 treesize of output 99 [2021-11-21 01:59:05,159 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:05,160 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:05,161 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 5 select indices, 5 select index equivalence classes, 10 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 40 treesize of output 30 [2021-11-21 01:59:05,307 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:05,308 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:05,309 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 7 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 57 treesize of output 45 [2021-11-21 01:59:05,442 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:05,443 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:05,446 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:05,447 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:05,449 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:05,450 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:05,451 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:59:05,453 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:05,454 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:59:05,510 INFO L354 Elim1Store]: treesize reduction 142, result has 12.3 percent of original size [2021-11-21 01:59:05,511 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 7 case distinctions, treesize of input 323 treesize of output 309 [2021-11-21 01:59:05,969 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:59:05,981 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-21 01:59:05,982 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 42 treesize of output 25 [2021-11-21 01:59:06,469 INFO L354 Elim1Store]: treesize reduction 85, result has 55.5 percent of original size [2021-11-21 01:59:06,470 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 4 new quantified variables, introduced 5 case distinctions, treesize of input 232 treesize of output 209 [2021-11-21 01:59:06,543 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 38 treesize of output 23 [2021-11-21 01:59:06,827 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 94 treesize of output 56 [2021-11-21 01:59:06,848 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:06,849 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 94 treesize of output 56 [2021-11-21 01:59:07,624 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 20 for LOIs [2021-11-21 01:59:07,647 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:59:08,620 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:59:08,620 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-21 01:59:08,620 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2021-11-21 01:59:08,620 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [75745379] [2021-11-21 01:59:08,621 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-21 01:59:08,621 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-21 01:59:08,621 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:59:08,622 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-21 01:59:08,622 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=822, Unknown=1, NotChecked=58, Total=992 [2021-11-21 01:59:08,623 INFO L87 Difference]: Start difference. First operand 21 states and 23 transitions. Second operand has 14 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 12 states have internal predecessors, (16), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-21 01:59:08,742 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:59:08,742 INFO L93 Difference]: Finished difference Result 38 states and 43 transitions. [2021-11-21 01:59:08,747 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-21 01:59:08,747 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 12 states have internal predecessors, (16), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 20 [2021-11-21 01:59:08,748 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:59:08,748 INFO L225 Difference]: With dead ends: 38 [2021-11-21 01:59:08,748 INFO L226 Difference]: Without dead ends: 35 [2021-11-21 01:59:08,749 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 18 SyntacticMatches, 1 SemanticMatches, 32 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 241 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=123, Invalid=936, Unknown=1, NotChecked=62, Total=1122 [2021-11-21 01:59:08,750 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 18 mSDsluCounter, 94 mSDsCounter, 0 mSdLazyCounter, 47 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 88 SdHoareTripleChecker+Invalid, 152 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 47 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 100 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:59:08,750 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [20 Valid, 88 Invalid, 152 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 47 Invalid, 0 Unknown, 100 Unchecked, 0.1s Time] [2021-11-21 01:59:08,751 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2021-11-21 01:59:08,756 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 30. [2021-11-21 01:59:08,756 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 23 states have (on average 1.2173913043478262) internal successors, (28), 23 states have internal predecessors, (28), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-21 01:59:08,757 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 34 transitions. [2021-11-21 01:59:08,757 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 34 transitions. Word has length 20 [2021-11-21 01:59:08,758 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:59:08,758 INFO L470 AbstractCegarLoop]: Abstraction has 30 states and 34 transitions. [2021-11-21 01:59:08,758 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 12 states have internal predecessors, (16), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-21 01:59:08,758 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 34 transitions. [2021-11-21 01:59:08,759 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-11-21 01:59:08,759 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:59:08,759 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:59:08,793 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c04b9c58-b7d1-40d0-99e9-0a5735db730a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-21 01:59:08,987 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c04b9c58-b7d1-40d0-99e9-0a5735db730a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:59:08,987 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:59:08,987 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:59:08,988 INFO L85 PathProgramCache]: Analyzing trace with hash -1815245974, now seen corresponding path program 5 times [2021-11-21 01:59:08,988 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:59:08,988 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2055809764] [2021-11-21 01:59:08,988 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:59:08,988 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:59:09,011 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:59:09,015 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1220479101] [2021-11-21 01:59:09,015 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:59:09,016 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:59:09,016 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c04b9c58-b7d1-40d0-99e9-0a5735db730a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:59:09,017 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c04b9c58-b7d1-40d0-99e9-0a5735db730a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:59:09,043 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c04b9c58-b7d1-40d0-99e9-0a5735db730a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-21 01:59:09,124 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-21 01:59:09,124 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:59:09,125 INFO L263 TraceCheckSpWp]: Trace formula consists of 108 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-21 01:59:09,127 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:59:09,206 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 8 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:59:09,206 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:59:09,268 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-21 01:59:09,268 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:59:09,268 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2055809764] [2021-11-21 01:59:09,268 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:59:09,269 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1220479101] [2021-11-21 01:59:09,269 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1220479101] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:59:09,269 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2118790293] [2021-11-21 01:59:09,273 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-21 01:59:09,273 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:59:09,274 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:59:09,274 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:59:09,275 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:59:09,506 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:09,508 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:09,554 INFO L354 Elim1Store]: treesize reduction 98, result has 24.6 percent of original size [2021-11-21 01:59:09,554 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 10 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 9 case distinctions, treesize of input 44 treesize of output 69 [2021-11-21 01:59:09,617 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:09,618 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:09,619 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:09,625 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 2 stores, 3 select indices, 3 select index equivalence classes, 11 disjoint index pairs (out of 3 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 67 treesize of output 99 [2021-11-21 01:59:09,732 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:09,733 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:09,734 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 5 select indices, 5 select index equivalence classes, 10 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 54 treesize of output 40 [2021-11-21 01:59:09,801 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:09,802 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:09,803 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 8 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 35 [2021-11-21 01:59:09,965 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:09,966 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:09,975 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:59:09,976 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:59:09,976 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:59:10,079 INFO L354 Elim1Store]: treesize reduction 250, result has 15.5 percent of original size [2021-11-21 01:59:10,079 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 9 case distinctions, treesize of input 316 treesize of output 314 [2021-11-21 01:59:10,615 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:59:10,641 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-21 01:59:10,642 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 42 treesize of output 25 [2021-11-21 01:59:11,033 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:59:11,034 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:59:11,037 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-21 01:59:11,161 INFO L354 Elim1Store]: treesize reduction 85, result has 55.5 percent of original size [2021-11-21 01:59:11,161 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 4 new quantified variables, introduced 5 case distinctions, treesize of input 232 treesize of output 209 [2021-11-21 01:59:11,255 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:59:11,256 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:59:11,257 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 1 new quantified variables, introduced 0 case distinctions, treesize of input 92 treesize of output 69 [2021-11-21 01:59:11,342 INFO L354 Elim1Store]: treesize reduction 26, result has 3.7 percent of original size [2021-11-21 01:59:11,342 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 94 treesize of output 56 [2021-11-21 01:59:11,988 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 20 for LOIs [2021-11-21 01:59:12,007 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:59:12,627 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:59:12,627 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-21 01:59:12,627 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 12 [2021-11-21 01:59:12,628 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [659934236] [2021-11-21 01:59:12,628 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-21 01:59:12,628 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-21 01:59:12,628 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:59:12,629 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-21 01:59:12,629 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=493, Unknown=0, NotChecked=0, Total=600 [2021-11-21 01:59:12,629 INFO L87 Difference]: Start difference. First operand 30 states and 34 transitions. Second operand has 12 states, 12 states have (on average 1.75) internal successors, (21), 12 states have internal predecessors, (21), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-21 01:59:12,767 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:59:12,767 INFO L93 Difference]: Finished difference Result 53 states and 58 transitions. [2021-11-21 01:59:12,768 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-21 01:59:12,768 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.75) internal successors, (21), 12 states have internal predecessors, (21), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 21 [2021-11-21 01:59:12,768 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:59:12,769 INFO L225 Difference]: With dead ends: 53 [2021-11-21 01:59:12,769 INFO L226 Difference]: Without dead ends: 45 [2021-11-21 01:59:12,770 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 38 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 220 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=142, Invalid=670, Unknown=0, NotChecked=0, Total=812 [2021-11-21 01:59:12,770 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 42 mSDsluCounter, 45 mSDsCounter, 0 mSdLazyCounter, 65 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 43 SdHoareTripleChecker+Valid, 51 SdHoareTripleChecker+Invalid, 91 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 65 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:59:12,771 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [43 Valid, 51 Invalid, 91 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 65 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:59:12,771 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2021-11-21 01:59:12,777 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 38. [2021-11-21 01:59:12,778 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 29 states have (on average 1.1724137931034482) internal successors, (34), 29 states have internal predecessors, (34), 4 states have call successors, (4), 4 states have call predecessors, (4), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-21 01:59:12,779 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 42 transitions. [2021-11-21 01:59:12,779 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 42 transitions. Word has length 21 [2021-11-21 01:59:12,779 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:59:12,779 INFO L470 AbstractCegarLoop]: Abstraction has 38 states and 42 transitions. [2021-11-21 01:59:12,780 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 1.75) internal successors, (21), 12 states have internal predecessors, (21), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-21 01:59:12,780 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 42 transitions. [2021-11-21 01:59:12,780 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-11-21 01:59:12,781 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:59:12,781 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:59:12,807 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c04b9c58-b7d1-40d0-99e9-0a5735db730a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-21 01:59:12,983 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c04b9c58-b7d1-40d0-99e9-0a5735db730a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:59:12,986 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:59:12,986 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:59:12,986 INFO L85 PathProgramCache]: Analyzing trace with hash 323778874, now seen corresponding path program 6 times [2021-11-21 01:59:12,986 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:59:12,987 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1260930475] [2021-11-21 01:59:12,987 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:59:12,987 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:59:13,024 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:59:13,024 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1404072493] [2021-11-21 01:59:13,025 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:59:13,025 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:59:13,025 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c04b9c58-b7d1-40d0-99e9-0a5735db730a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:59:13,033 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c04b9c58-b7d1-40d0-99e9-0a5735db730a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:59:13,039 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c04b9c58-b7d1-40d0-99e9-0a5735db730a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-21 01:59:13,080 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:59:13,080 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:59:13,082 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-21 01:59:13,083 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:59:13,166 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:59:13,166 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:59:13,223 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-21 01:59:13,223 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:59:13,223 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1260930475] [2021-11-21 01:59:13,223 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:59:13,223 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1404072493] [2021-11-21 01:59:13,223 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1404072493] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:59:13,223 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1391750022] [2021-11-21 01:59:13,226 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-21 01:59:13,226 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:59:13,226 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:59:13,226 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:59:13,227 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:59:13,465 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:13,467 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:13,468 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:13,526 INFO L354 Elim1Store]: treesize reduction 98, result has 24.6 percent of original size [2021-11-21 01:59:13,527 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 10 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 9 case distinctions, treesize of input 44 treesize of output 69 [2021-11-21 01:59:13,573 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:13,573 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:13,574 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:13,575 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 2 stores, 3 select indices, 3 select index equivalence classes, 12 disjoint index pairs (out of 3 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 67 treesize of output 99 [2021-11-21 01:59:13,606 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:13,607 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:13,608 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 5 select indices, 5 select index equivalence classes, 11 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 40 treesize of output 30 [2021-11-21 01:59:13,764 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:13,765 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:13,766 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 7 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 57 treesize of output 45 [2021-11-21 01:59:13,924 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:13,925 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:13,928 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:13,929 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:13,930 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:13,933 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:13,934 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:59:13,937 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:13,938 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:59:13,975 INFO L354 Elim1Store]: treesize reduction 142, result has 12.3 percent of original size [2021-11-21 01:59:13,976 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 7 case distinctions, treesize of input 323 treesize of output 309 [2021-11-21 01:59:14,366 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:59:14,375 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-21 01:59:14,376 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 42 treesize of output 25 [2021-11-21 01:59:14,924 INFO L354 Elim1Store]: treesize reduction 85, result has 55.5 percent of original size [2021-11-21 01:59:14,925 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 4 new quantified variables, introduced 5 case distinctions, treesize of input 232 treesize of output 209 [2021-11-21 01:59:14,968 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:59:14,969 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 1 new quantified variables, introduced 0 case distinctions, treesize of input 92 treesize of output 69 [2021-11-21 01:59:15,083 INFO L354 Elim1Store]: treesize reduction 26, result has 3.7 percent of original size [2021-11-21 01:59:15,083 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 71 treesize of output 33 [2021-11-21 01:59:15,155 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-21 01:59:15,902 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 20 for LOIs [2021-11-21 01:59:15,920 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:59:16,505 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:59:16,506 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-21 01:59:16,506 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 12 [2021-11-21 01:59:16,506 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [885178217] [2021-11-21 01:59:16,506 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-21 01:59:16,507 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-21 01:59:16,507 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:59:16,507 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-21 01:59:16,508 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=502, Unknown=0, NotChecked=0, Total=600 [2021-11-21 01:59:16,508 INFO L87 Difference]: Start difference. First operand 38 states and 42 transitions. Second operand has 12 states, 12 states have (on average 1.75) internal successors, (21), 12 states have internal predecessors, (21), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-21 01:59:16,734 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:59:16,734 INFO L93 Difference]: Finished difference Result 45 states and 48 transitions. [2021-11-21 01:59:16,735 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-21 01:59:16,735 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.75) internal successors, (21), 12 states have internal predecessors, (21), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 21 [2021-11-21 01:59:16,735 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:59:16,736 INFO L225 Difference]: With dead ends: 45 [2021-11-21 01:59:16,736 INFO L226 Difference]: Without dead ends: 42 [2021-11-21 01:59:16,737 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 38 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 244 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=132, Invalid=680, Unknown=0, NotChecked=0, Total=812 [2021-11-21 01:59:16,738 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 16 mSDsluCounter, 65 mSDsCounter, 0 mSdLazyCounter, 97 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 67 SdHoareTripleChecker+Invalid, 114 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 97 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 01:59:16,738 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [17 Valid, 67 Invalid, 114 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 97 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 01:59:16,739 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2021-11-21 01:59:16,745 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 39. [2021-11-21 01:59:16,745 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 30 states have (on average 1.1666666666666667) internal successors, (35), 30 states have internal predecessors, (35), 4 states have call successors, (4), 4 states have call predecessors, (4), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-21 01:59:16,746 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 43 transitions. [2021-11-21 01:59:16,746 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 43 transitions. Word has length 21 [2021-11-21 01:59:16,746 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:59:16,747 INFO L470 AbstractCegarLoop]: Abstraction has 39 states and 43 transitions. [2021-11-21 01:59:16,747 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 1.75) internal successors, (21), 12 states have internal predecessors, (21), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-21 01:59:16,747 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 43 transitions. [2021-11-21 01:59:16,748 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-11-21 01:59:16,748 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:59:16,748 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:59:16,786 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c04b9c58-b7d1-40d0-99e9-0a5735db730a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-21 01:59:16,975 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c04b9c58-b7d1-40d0-99e9-0a5735db730a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:59:16,975 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:59:16,975 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:59:16,975 INFO L85 PathProgramCache]: Analyzing trace with hash 1446975050, now seen corresponding path program 7 times [2021-11-21 01:59:16,976 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:59:16,976 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [96946422] [2021-11-21 01:59:16,976 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:59:16,976 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:59:16,989 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:59:16,990 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1562392825] [2021-11-21 01:59:16,990 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 01:59:16,990 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:59:16,990 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c04b9c58-b7d1-40d0-99e9-0a5735db730a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:59:16,993 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c04b9c58-b7d1-40d0-99e9-0a5735db730a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:59:16,993 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c04b9c58-b7d1-40d0-99e9-0a5735db730a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-21 01:59:17,107 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:59:17,108 INFO L263 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 44 conjunts are in the unsatisfiable core [2021-11-21 01:59:17,110 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:59:17,131 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 10 treesize of output 8 [2021-11-21 01:59:17,165 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 42 treesize of output 25 [2021-11-21 01:59:17,214 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:17,215 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:17,217 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 67 treesize of output 55 [2021-11-21 01:59:17,287 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:17,288 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:17,288 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:17,289 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:17,291 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:17,292 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:17,294 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 7 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 66 treesize of output 63 [2021-11-21 01:59:17,816 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:17,819 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:17,820 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:17,820 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:17,821 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:17,822 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:17,823 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:18,072 INFO L354 Elim1Store]: treesize reduction 775, result has 18.5 percent of original size [2021-11-21 01:59:18,073 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 9 select indices, 9 select index equivalence classes, 7 disjoint index pairs (out of 36 index pairs), introduced 11 new quantified variables, introduced 24 case distinctions, treesize of input 258 treesize of output 306 [2021-11-21 01:59:20,565 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:20,566 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:20,567 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:20,568 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:20,569 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:20,570 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:20,571 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:20,572 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:20,573 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:20,573 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:20,574 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:20,575 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:20,576 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:20,615 INFO L354 Elim1Store]: treesize reduction 59, result has 29.8 percent of original size [2021-11-21 01:59:20,616 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 9 select indices, 9 select index equivalence classes, 14 disjoint index pairs (out of 36 index pairs), introduced 9 new quantified variables, introduced 5 case distinctions, treesize of input 514 treesize of output 379 [2021-11-21 01:59:30,326 INFO L354 Elim1Store]: treesize reduction 84, result has 22.9 percent of original size [2021-11-21 01:59:30,327 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 7 select indices, 7 select index equivalence classes, 3 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 21 case distinctions, treesize of input 444 treesize of output 260 [2021-11-21 01:59:30,644 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 2 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:59:30,644 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:59:45,969 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:59:45,969 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [96946422] [2021-11-21 01:59:45,969 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:59:45,970 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1562392825] [2021-11-21 01:59:45,970 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1562392825] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:59:45,970 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [987994155] [2021-11-21 01:59:45,972 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-21 01:59:45,972 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:59:45,973 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:59:45,973 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:59:45,973 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:59:46,193 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:46,194 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:46,198 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:46,296 INFO L354 Elim1Store]: treesize reduction 170, result has 28.9 percent of original size [2021-11-21 01:59:46,296 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 2 stores, 3 select indices, 3 select index equivalence classes, 6 disjoint index pairs (out of 3 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 67 treesize of output 127 [2021-11-21 01:59:46,326 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:46,328 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:46,367 INFO L354 Elim1Store]: treesize reduction 8, result has 80.5 percent of original size [2021-11-21 01:59:46,368 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 5 select indices, 5 select index equivalence classes, 5 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 5 case distinctions, treesize of input 54 treesize of output 76 [2021-11-21 01:59:46,471 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:46,472 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:46,474 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:46,476 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:46,530 INFO L354 Elim1Store]: treesize reduction 98, result has 24.6 percent of original size [2021-11-21 01:59:46,530 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 10 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 9 case distinctions, treesize of input 44 treesize of output 69 [2021-11-21 01:59:46,648 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:46,649 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:46,651 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 7 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 35 [2021-11-21 01:59:46,762 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:46,763 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:46,768 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:59:46,768 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:59:46,769 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:59:46,864 INFO L354 Elim1Store]: treesize reduction 250, result has 15.5 percent of original size [2021-11-21 01:59:46,864 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 9 case distinctions, treesize of input 316 treesize of output 314 [2021-11-21 01:59:47,666 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:59:47,680 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-21 01:59:47,680 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 1 case distinctions, treesize of input 42 treesize of output 25 [2021-11-21 01:59:48,180 INFO L354 Elim1Store]: treesize reduction 85, result has 55.5 percent of original size [2021-11-21 01:59:48,180 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 4 new quantified variables, introduced 5 case distinctions, treesize of input 232 treesize of output 209 [2021-11-21 01:59:48,250 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:59:48,251 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:59:48,252 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 1 new quantified variables, introduced 0 case distinctions, treesize of input 69 treesize of output 46 [2021-11-21 01:59:48,318 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 38 treesize of output 23 [2021-11-21 01:59:48,396 INFO L354 Elim1Store]: treesize reduction 26, result has 3.7 percent of original size [2021-11-21 01:59:48,396 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 61 treesize of output 23 [2021-11-21 01:59:49,053 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 20 for LOIs [2021-11-21 01:59:49,071 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:59:50,692 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:59:50,693 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-21 01:59:50,693 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2021-11-21 01:59:50,693 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [14176311] [2021-11-21 01:59:50,693 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-21 01:59:50,693 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-21 01:59:50,693 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:59:50,694 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-21 01:59:50,694 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=142, Invalid=1113, Unknown=5, NotChecked=0, Total=1260 [2021-11-21 01:59:50,695 INFO L87 Difference]: Start difference. First operand 39 states and 43 transitions. Second operand has 17 states, 16 states have (on average 1.125) internal successors, (18), 14 states have internal predecessors, (18), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-21 01:59:53,232 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:59:53,232 INFO L93 Difference]: Finished difference Result 64 states and 72 transitions. [2021-11-21 01:59:53,233 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-21 01:59:53,233 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 16 states have (on average 1.125) internal successors, (18), 14 states have internal predecessors, (18), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 22 [2021-11-21 01:59:53,233 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:59:53,234 INFO L225 Difference]: With dead ends: 64 [2021-11-21 01:59:53,234 INFO L226 Difference]: Without dead ends: 61 [2021-11-21 01:59:53,235 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 19 SyntacticMatches, 1 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 364 ImplicationChecksByTransitivity, 22.6s TimeCoverageRelationStatistics Valid=157, Invalid=1243, Unknown=6, NotChecked=0, Total=1406 [2021-11-21 01:59:53,236 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 25 mSDsluCounter, 130 mSDsCounter, 0 mSdLazyCounter, 88 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 137 SdHoareTripleChecker+Invalid, 189 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 88 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 93 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 01:59:53,237 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [26 Valid, 137 Invalid, 189 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 88 Invalid, 0 Unknown, 93 Unchecked, 0.2s Time] [2021-11-21 01:59:53,237 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2021-11-21 01:59:53,246 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 48. [2021-11-21 01:59:53,246 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 37 states have (on average 1.1891891891891893) internal successors, (44), 37 states have internal predecessors, (44), 5 states have call successors, (5), 5 states have call predecessors, (5), 5 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-11-21 01:59:53,248 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 54 transitions. [2021-11-21 01:59:53,248 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 54 transitions. Word has length 22 [2021-11-21 01:59:53,248 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:59:53,249 INFO L470 AbstractCegarLoop]: Abstraction has 48 states and 54 transitions. [2021-11-21 01:59:53,249 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 16 states have (on average 1.125) internal successors, (18), 14 states have internal predecessors, (18), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-21 01:59:53,249 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 54 transitions. [2021-11-21 01:59:53,250 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-11-21 01:59:53,250 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:59:53,250 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:59:53,288 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c04b9c58-b7d1-40d0-99e9-0a5735db730a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-21 01:59:53,463 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c04b9c58-b7d1-40d0-99e9-0a5735db730a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-11-21 01:59:53,463 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:59:53,463 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:59:53,464 INFO L85 PathProgramCache]: Analyzing trace with hash 1906318138, now seen corresponding path program 8 times [2021-11-21 01:59:53,464 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:59:53,464 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [222670884] [2021-11-21 01:59:53,464 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:59:53,464 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:59:53,479 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:59:53,479 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2070968998] [2021-11-21 01:59:53,479 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:59:53,479 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:59:53,480 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c04b9c58-b7d1-40d0-99e9-0a5735db730a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:59:53,480 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c04b9c58-b7d1-40d0-99e9-0a5735db730a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:59:53,489 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c04b9c58-b7d1-40d0-99e9-0a5735db730a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-21 01:59:53,629 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-21 01:59:53,629 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:59:53,633 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-21 01:59:53,634 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:59:53,726 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 12 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:59:53,726 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:59:53,798 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-21 01:59:53,798 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:59:53,798 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [222670884] [2021-11-21 01:59:53,798 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:59:53,798 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2070968998] [2021-11-21 01:59:53,799 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2070968998] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:59:53,799 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1933824592] [2021-11-21 01:59:53,800 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-21 01:59:53,801 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:59:53,801 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:59:53,801 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:59:53,801 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:59:53,988 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:53,990 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:54,037 INFO L354 Elim1Store]: treesize reduction 98, result has 24.6 percent of original size [2021-11-21 01:59:54,037 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 10 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 9 case distinctions, treesize of input 44 treesize of output 69 [2021-11-21 01:59:54,086 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:54,087 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:54,088 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:54,089 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 2 stores, 3 select indices, 3 select index equivalence classes, 12 disjoint index pairs (out of 3 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 67 treesize of output 99 [2021-11-21 01:59:54,141 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:54,142 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:54,142 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 5 select indices, 5 select index equivalence classes, 11 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 47 treesize of output 35 [2021-11-21 01:59:54,255 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:54,256 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:54,256 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 8 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 57 treesize of output 45 [2021-11-21 01:59:54,426 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:54,427 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:54,430 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:54,431 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:54,432 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:54,433 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:54,433 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:59:54,437 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:54,437 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:59:54,476 INFO L354 Elim1Store]: treesize reduction 142, result has 12.3 percent of original size [2021-11-21 01:59:54,477 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 7 case distinctions, treesize of input 323 treesize of output 309 [2021-11-21 01:59:54,822 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:59:54,834 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-21 01:59:54,834 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 1 case distinctions, treesize of input 42 treesize of output 25 [2021-11-21 01:59:55,204 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:59:55,205 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:59:55,208 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-21 01:59:55,346 INFO L354 Elim1Store]: treesize reduction 85, result has 55.5 percent of original size [2021-11-21 01:59:55,347 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 4 new quantified variables, introduced 5 case distinctions, treesize of input 232 treesize of output 209 [2021-11-21 01:59:55,399 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:59:55,399 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 1 new quantified variables, introduced 0 case distinctions, treesize of input 69 treesize of output 46 [2021-11-21 01:59:55,527 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 38 treesize of output 23 [2021-11-21 01:59:55,617 INFO L354 Elim1Store]: treesize reduction 26, result has 3.7 percent of original size [2021-11-21 01:59:55,617 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 94 treesize of output 56 [2021-11-21 01:59:56,312 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 20 for LOIs [2021-11-21 01:59:56,330 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:59:56,941 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:59:56,941 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-21 01:59:56,942 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-11-21 01:59:56,942 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1395973998] [2021-11-21 01:59:56,942 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-21 01:59:56,942 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-21 01:59:56,942 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:59:56,943 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-21 01:59:56,943 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=622, Unknown=0, NotChecked=0, Total=756 [2021-11-21 01:59:56,944 INFO L87 Difference]: Start difference. First operand 48 states and 54 transitions. Second operand has 15 states, 15 states have (on average 1.6) internal successors, (24), 15 states have internal predecessors, (24), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-21 01:59:57,257 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:59:57,257 INFO L93 Difference]: Finished difference Result 76 states and 82 transitions. [2021-11-21 01:59:57,258 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-21 01:59:57,258 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.6) internal successors, (24), 15 states have internal predecessors, (24), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 23 [2021-11-21 01:59:57,258 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:59:57,259 INFO L225 Difference]: With dead ends: 76 [2021-11-21 01:59:57,259 INFO L226 Difference]: Without dead ends: 67 [2021-11-21 01:59:57,260 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 367 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=233, Invalid=1099, Unknown=0, NotChecked=0, Total=1332 [2021-11-21 01:59:57,261 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 93 mSDsluCounter, 73 mSDsCounter, 0 mSdLazyCounter, 104 mSolverCounterSat, 53 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 94 SdHoareTripleChecker+Valid, 79 SdHoareTripleChecker+Invalid, 157 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 53 IncrementalHoareTripleChecker+Valid, 104 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 01:59:57,261 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [94 Valid, 79 Invalid, 157 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [53 Valid, 104 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 01:59:57,262 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2021-11-21 01:59:57,274 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 54. [2021-11-21 01:59:57,274 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 41 states have (on average 1.170731707317073) internal successors, (48), 41 states have internal predecessors, (48), 6 states have call successors, (6), 6 states have call predecessors, (6), 6 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-21 01:59:57,275 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 60 transitions. [2021-11-21 01:59:57,275 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 60 transitions. Word has length 23 [2021-11-21 01:59:57,275 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:59:57,275 INFO L470 AbstractCegarLoop]: Abstraction has 54 states and 60 transitions. [2021-11-21 01:59:57,276 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 1.6) internal successors, (24), 15 states have internal predecessors, (24), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-21 01:59:57,276 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 60 transitions. [2021-11-21 01:59:57,277 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-11-21 01:59:57,277 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:59:57,277 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:59:57,309 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c04b9c58-b7d1-40d0-99e9-0a5735db730a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-21 01:59:57,499 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c04b9c58-b7d1-40d0-99e9-0a5735db730a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:59:57,499 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:59:57,499 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:59:57,500 INFO L85 PathProgramCache]: Analyzing trace with hash -503388310, now seen corresponding path program 9 times [2021-11-21 01:59:57,500 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:59:57,500 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2111620053] [2021-11-21 01:59:57,500 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:59:57,500 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:59:57,512 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:59:57,512 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1479498247] [2021-11-21 01:59:57,512 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:59:57,512 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:59:57,513 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c04b9c58-b7d1-40d0-99e9-0a5735db730a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:59:57,524 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c04b9c58-b7d1-40d0-99e9-0a5735db730a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:59:57,525 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c04b9c58-b7d1-40d0-99e9-0a5735db730a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-21 01:59:57,582 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:59:57,582 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:59:57,583 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-21 01:59:57,584 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:59:57,694 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 8 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:59:57,694 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:59:57,777 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-21 01:59:57,777 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:59:57,777 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2111620053] [2021-11-21 01:59:57,777 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:59:57,777 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1479498247] [2021-11-21 01:59:57,777 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1479498247] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:59:57,777 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1058750026] [2021-11-21 01:59:57,779 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-21 01:59:57,779 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:59:57,780 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:59:57,780 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:59:57,780 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:59:57,965 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:57,967 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:58,013 INFO L354 Elim1Store]: treesize reduction 98, result has 24.6 percent of original size [2021-11-21 01:59:58,014 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 10 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 9 case distinctions, treesize of input 44 treesize of output 69 [2021-11-21 01:59:58,059 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:58,059 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:58,060 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:58,061 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 2 stores, 3 select indices, 3 select index equivalence classes, 12 disjoint index pairs (out of 3 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 67 treesize of output 99 [2021-11-21 01:59:58,134 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:58,136 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:58,137 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 5 select indices, 5 select index equivalence classes, 11 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 49 treesize of output 37 [2021-11-21 01:59:58,255 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:58,256 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:58,257 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 8 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 57 treesize of output 45 [2021-11-21 01:59:58,476 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:58,477 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:58,480 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:58,481 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:58,482 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:58,483 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:58,484 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:59:58,487 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:58,488 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:59:58,527 INFO L354 Elim1Store]: treesize reduction 142, result has 12.3 percent of original size [2021-11-21 01:59:58,527 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 7 case distinctions, treesize of input 323 treesize of output 309 [2021-11-21 01:59:58,942 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:59:58,953 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-21 01:59:58,953 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 42 treesize of output 25 [2021-11-21 01:59:59,453 INFO L354 Elim1Store]: treesize reduction 85, result has 55.5 percent of original size [2021-11-21 01:59:59,453 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 4 new quantified variables, introduced 5 case distinctions, treesize of input 232 treesize of output 209 [2021-11-21 01:59:59,530 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:59:59,531 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:59:59,532 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 1 new quantified variables, introduced 0 case distinctions, treesize of input 92 treesize of output 69 [2021-11-21 01:59:59,639 INFO L354 Elim1Store]: treesize reduction 26, result has 3.7 percent of original size [2021-11-21 01:59:59,639 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 94 treesize of output 56 [2021-11-21 02:00:00,462 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 20 for LOIs [2021-11-21 02:00:00,486 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 02:00:01,088 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 02:00:01,088 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-21 02:00:01,088 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-11-21 02:00:01,088 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1353732137] [2021-11-21 02:00:01,089 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-21 02:00:01,089 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-21 02:00:01,089 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 02:00:01,089 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-21 02:00:01,090 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=638, Unknown=0, NotChecked=0, Total=756 [2021-11-21 02:00:01,090 INFO L87 Difference]: Start difference. First operand 54 states and 60 transitions. Second operand has 15 states, 15 states have (on average 1.6) internal successors, (24), 15 states have internal predecessors, (24), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-21 02:00:01,255 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 02:00:01,255 INFO L93 Difference]: Finished difference Result 67 states and 71 transitions. [2021-11-21 02:00:01,256 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-21 02:00:01,256 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.6) internal successors, (24), 15 states have internal predecessors, (24), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 23 [2021-11-21 02:00:01,256 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 02:00:01,257 INFO L225 Difference]: With dead ends: 67 [2021-11-21 02:00:01,257 INFO L226 Difference]: Without dead ends: 64 [2021-11-21 02:00:01,258 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 351 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=168, Invalid=888, Unknown=0, NotChecked=0, Total=1056 [2021-11-21 02:00:01,259 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 36 mSDsluCounter, 84 mSDsCounter, 0 mSdLazyCounter, 127 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 93 SdHoareTripleChecker+Invalid, 151 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 127 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 02:00:01,259 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [38 Valid, 93 Invalid, 151 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 127 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 02:00:01,260 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2021-11-21 02:00:01,270 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 55. [2021-11-21 02:00:01,270 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 42 states have (on average 1.1666666666666667) internal successors, (49), 42 states have internal predecessors, (49), 6 states have call successors, (6), 6 states have call predecessors, (6), 6 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-21 02:00:01,271 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 61 transitions. [2021-11-21 02:00:01,271 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 61 transitions. Word has length 23 [2021-11-21 02:00:01,272 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 02:00:01,272 INFO L470 AbstractCegarLoop]: Abstraction has 55 states and 61 transitions. [2021-11-21 02:00:01,272 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 1.6) internal successors, (24), 15 states have internal predecessors, (24), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-21 02:00:01,272 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 61 transitions. [2021-11-21 02:00:01,273 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-11-21 02:00:01,273 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 02:00:01,273 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 02:00:01,297 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c04b9c58-b7d1-40d0-99e9-0a5735db730a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-21 02:00:01,483 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c04b9c58-b7d1-40d0-99e9-0a5735db730a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 02:00:01,483 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 02:00:01,483 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 02:00:01,484 INFO L85 PathProgramCache]: Analyzing trace with hash 1574596122, now seen corresponding path program 10 times [2021-11-21 02:00:01,484 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 02:00:01,484 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [164656930] [2021-11-21 02:00:01,484 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 02:00:01,484 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 02:00:01,495 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 02:00:01,495 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [129483484] [2021-11-21 02:00:01,495 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 02:00:01,495 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 02:00:01,496 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c04b9c58-b7d1-40d0-99e9-0a5735db730a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 02:00:01,496 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c04b9c58-b7d1-40d0-99e9-0a5735db730a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 02:00:01,511 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c04b9c58-b7d1-40d0-99e9-0a5735db730a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-21 02:00:01,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 02:00:01,705 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 53 conjunts are in the unsatisfiable core [2021-11-21 02:00:01,707 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 02:00:01,730 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 10 treesize of output 8 [2021-11-21 02:00:01,765 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 25 [2021-11-21 02:00:01,805 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 02:00:01,806 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 02:00:01,807 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 67 treesize of output 55 [2021-11-21 02:00:01,875 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 02:00:01,875 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 02:00:01,876 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 02:00:01,877 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 02:00:01,877 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 02:00:01,878 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 02:00:01,878 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 7 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 66 treesize of output 63 [2021-11-21 02:00:01,965 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 02:00:01,966 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 02:00:01,966 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 02:00:01,967 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 02:00:01,968 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 02:00:01,968 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 02:00:01,969 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 02:00:01,969 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 02:00:01,970 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 02:00:01,971 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 02:00:01,971 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 02:00:01,972 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 02:00:01,973 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 6 select indices, 6 select index equivalence classes, 13 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 0 case distinctions, treesize of input 84 treesize of output 87 [2021-11-21 02:00:02,552 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 02:00:02,554 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 02:00:02,555 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 02:00:02,555 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 02:00:02,556 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 02:00:02,557 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 02:00:02,557 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 02:00:02,558 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 02:00:02,559 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 02:00:02,559 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 02:00:02,560 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 02:00:02,560 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 02:00:02,561 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 02:00:02,906 INFO L354 Elim1Store]: treesize reduction 954, result has 20.9 percent of original size [2021-11-21 02:00:02,906 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 11 select indices, 11 select index equivalence classes, 13 disjoint index pairs (out of 55 index pairs), introduced 13 new quantified variables, introduced 31 case distinctions, treesize of input 276 treesize of output 388