./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/nla-digbench-scaling/hard2_valuebound20.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_df2124b1-d65b-44de-99c2-c9fd7d0c2b22/bin/utaipan-TEXQjIfE4P/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df2124b1-d65b-44de-99c2-c9fd7d0c2b22/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_df2124b1-d65b-44de-99c2-c9fd7d0c2b22/bin/utaipan-TEXQjIfE4P/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df2124b1-d65b-44de-99c2-c9fd7d0c2b22/bin/utaipan-TEXQjIfE4P/config/TaipanReach.xml -i ../../sv-benchmarks/c/nla-digbench-scaling/hard2_valuebound20.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df2124b1-d65b-44de-99c2-c9fd7d0c2b22/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_df2124b1-d65b-44de-99c2-c9fd7d0c2b22/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 1619c1c02ba7c9b660af32e6427e3b3d5cd6ca3ff286b9db386918ae0c8b508c --- Real Ultimate output --- This is Ultimate 0.2.1-dev-53f42b1 [2021-11-21 01:40:26,652 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-21 01:40:26,654 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-21 01:40:26,687 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-21 01:40:26,688 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-21 01:40:26,690 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-21 01:40:26,691 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-21 01:40:26,694 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-21 01:40:26,696 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-21 01:40:26,697 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-21 01:40:26,698 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-21 01:40:26,700 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-21 01:40:26,702 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-21 01:40:26,705 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-21 01:40:26,707 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-21 01:40:26,711 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-21 01:40:26,715 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-21 01:40:26,720 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-21 01:40:26,722 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-21 01:40:26,725 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-21 01:40:26,726 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-21 01:40:26,728 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-21 01:40:26,729 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-21 01:40:26,730 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-21 01:40:26,734 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-21 01:40:26,734 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-21 01:40:26,735 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-21 01:40:26,736 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-21 01:40:26,737 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-21 01:40:26,738 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-21 01:40:26,738 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-21 01:40:26,739 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-21 01:40:26,740 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-21 01:40:26,741 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-21 01:40:26,743 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-21 01:40:26,743 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-21 01:40:26,744 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-21 01:40:26,744 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-21 01:40:26,745 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-21 01:40:26,746 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-21 01:40:26,747 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-21 01:40:26,748 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df2124b1-d65b-44de-99c2-c9fd7d0c2b22/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-21 01:40:26,776 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-21 01:40:26,776 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-21 01:40:26,777 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-21 01:40:26,777 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-21 01:40:26,778 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-21 01:40:26,778 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-21 01:40:26,778 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-21 01:40:26,779 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-21 01:40:26,779 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-21 01:40:26,779 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-21 01:40:26,779 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-21 01:40:26,780 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-21 01:40:26,780 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-21 01:40:26,780 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-21 01:40:26,781 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-21 01:40:26,781 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-21 01:40:26,781 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-21 01:40:26,782 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-21 01:40:26,782 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-21 01:40:26,783 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-21 01:40:26,783 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-21 01:40:26,783 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-21 01:40:26,784 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-21 01:40:26,784 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-21 01:40:26,784 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-21 01:40:26,784 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-21 01:40:26,785 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-21 01:40:26,785 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-21 01:40:26,785 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-21 01:40:26,786 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-21 01:40:26,786 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-21 01:40:26,786 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-21 01:40:26,787 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 01:40:26,787 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-21 01:40:26,787 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-21 01:40:26,787 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-21 01:40:26,788 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-21 01:40:26,788 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-21 01:40:26,788 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-21 01:40:26,789 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-21 01:40:26,789 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-21 01:40:26,789 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_df2124b1-d65b-44de-99c2-c9fd7d0c2b22/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df2124b1-d65b-44de-99c2-c9fd7d0c2b22/bin/utaipan-TEXQjIfE4P Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 1619c1c02ba7c9b660af32e6427e3b3d5cd6ca3ff286b9db386918ae0c8b508c [2021-11-21 01:40:27,043 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-21 01:40:27,075 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-21 01:40:27,078 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-21 01:40:27,079 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-21 01:40:27,080 INFO L275 PluginConnector]: CDTParser initialized [2021-11-21 01:40:27,081 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df2124b1-d65b-44de-99c2-c9fd7d0c2b22/bin/utaipan-TEXQjIfE4P/../../sv-benchmarks/c/nla-digbench-scaling/hard2_valuebound20.c [2021-11-21 01:40:27,156 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df2124b1-d65b-44de-99c2-c9fd7d0c2b22/bin/utaipan-TEXQjIfE4P/data/3cd0ed9f0/c1ffd528f4504508b53d167910c3802f/FLAG5a3bdff75 [2021-11-21 01:40:27,600 INFO L306 CDTParser]: Found 1 translation units. [2021-11-21 01:40:27,601 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df2124b1-d65b-44de-99c2-c9fd7d0c2b22/sv-benchmarks/c/nla-digbench-scaling/hard2_valuebound20.c [2021-11-21 01:40:27,607 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df2124b1-d65b-44de-99c2-c9fd7d0c2b22/bin/utaipan-TEXQjIfE4P/data/3cd0ed9f0/c1ffd528f4504508b53d167910c3802f/FLAG5a3bdff75 [2021-11-21 01:40:27,992 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df2124b1-d65b-44de-99c2-c9fd7d0c2b22/bin/utaipan-TEXQjIfE4P/data/3cd0ed9f0/c1ffd528f4504508b53d167910c3802f [2021-11-21 01:40:27,996 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-21 01:40:27,998 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-21 01:40:28,002 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-21 01:40:28,002 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-21 01:40:28,006 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-21 01:40:28,007 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 01:40:27" (1/1) ... [2021-11-21 01:40:28,009 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@613eaf54 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:40:28, skipping insertion in model container [2021-11-21 01:40:28,009 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 01:40:27" (1/1) ... [2021-11-21 01:40:28,017 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-21 01:40:28,033 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-21 01:40:28,259 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_df2124b1-d65b-44de-99c2-c9fd7d0c2b22/sv-benchmarks/c/nla-digbench-scaling/hard2_valuebound20.c[526,539] [2021-11-21 01:40:28,282 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 01:40:28,291 INFO L203 MainTranslator]: Completed pre-run [2021-11-21 01:40:28,306 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_df2124b1-d65b-44de-99c2-c9fd7d0c2b22/sv-benchmarks/c/nla-digbench-scaling/hard2_valuebound20.c[526,539] [2021-11-21 01:40:28,325 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 01:40:28,338 INFO L208 MainTranslator]: Completed translation [2021-11-21 01:40:28,338 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:40:28 WrapperNode [2021-11-21 01:40:28,339 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-21 01:40:28,341 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-21 01:40:28,342 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-21 01:40:28,342 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-21 01:40:28,349 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:40:28" (1/1) ... [2021-11-21 01:40:28,356 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:40:28" (1/1) ... [2021-11-21 01:40:28,381 INFO L137 Inliner]: procedures = 14, calls = 15, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 56 [2021-11-21 01:40:28,382 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-21 01:40:28,383 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-21 01:40:28,383 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-21 01:40:28,383 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-21 01:40:28,392 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:40:28" (1/1) ... [2021-11-21 01:40:28,393 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:40:28" (1/1) ... [2021-11-21 01:40:28,406 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:40:28" (1/1) ... [2021-11-21 01:40:28,409 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:40:28" (1/1) ... [2021-11-21 01:40:28,412 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:40:28" (1/1) ... [2021-11-21 01:40:28,416 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:40:28" (1/1) ... [2021-11-21 01:40:28,417 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:40:28" (1/1) ... [2021-11-21 01:40:28,419 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-21 01:40:28,419 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-21 01:40:28,420 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-21 01:40:28,420 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-21 01:40:28,429 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:40:28" (1/1) ... [2021-11-21 01:40:28,436 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 01:40:28,454 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df2124b1-d65b-44de-99c2-c9fd7d0c2b22/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:40:28,489 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df2124b1-d65b-44de-99c2-c9fd7d0c2b22/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-21 01:40:28,495 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df2124b1-d65b-44de-99c2-c9fd7d0c2b22/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-21 01:40:28,528 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-21 01:40:28,528 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-21 01:40:28,528 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-21 01:40:28,528 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-21 01:40:28,529 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-11-21 01:40:28,529 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-11-21 01:40:28,586 INFO L236 CfgBuilder]: Building ICFG [2021-11-21 01:40:28,588 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-21 01:40:28,695 INFO L277 CfgBuilder]: Performing block encoding [2021-11-21 01:40:28,737 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-21 01:40:28,738 INFO L301 CfgBuilder]: Removed 2 assume(true) statements. [2021-11-21 01:40:28,741 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 01:40:28 BoogieIcfgContainer [2021-11-21 01:40:28,741 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-21 01:40:28,743 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-21 01:40:28,743 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-21 01:40:28,747 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-21 01:40:28,748 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.11 01:40:27" (1/3) ... [2021-11-21 01:40:28,748 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7688bfab and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 01:40:28, skipping insertion in model container [2021-11-21 01:40:28,749 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:40:28" (2/3) ... [2021-11-21 01:40:28,749 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7688bfab and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 01:40:28, skipping insertion in model container [2021-11-21 01:40:28,749 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 01:40:28" (3/3) ... [2021-11-21 01:40:28,750 INFO L111 eAbstractionObserver]: Analyzing ICFG hard2_valuebound20.c [2021-11-21 01:40:28,755 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-21 01:40:28,756 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-21 01:40:28,812 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-21 01:40:28,819 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 01:40:28,820 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-21 01:40:28,839 INFO L276 IsEmpty]: Start isEmpty. Operand has 20 states, 10 states have (on average 1.6) internal successors, (16), 11 states have internal predecessors, (16), 7 states have call successors, (7), 1 states have call predecessors, (7), 1 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-11-21 01:40:28,842 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-11-21 01:40:28,842 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:40:28,843 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-11-21 01:40:28,843 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:40:28,848 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:40:28,848 INFO L85 PathProgramCache]: Analyzing trace with hash -697525204, now seen corresponding path program 1 times [2021-11-21 01:40:28,859 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:40:28,860 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1597867103] [2021-11-21 01:40:28,860 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:40:28,861 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:40:28,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:40:29,047 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 01:40:29,048 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:40:29,048 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1597867103] [2021-11-21 01:40:29,049 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1597867103] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:40:29,049 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:40:29,050 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-21 01:40:29,051 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1674340207] [2021-11-21 01:40:29,052 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:40:29,056 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-21 01:40:29,056 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:40:29,092 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-21 01:40:29,093 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-21 01:40:29,095 INFO L87 Difference]: Start difference. First operand has 20 states, 10 states have (on average 1.6) internal successors, (16), 11 states have internal predecessors, (16), 7 states have call successors, (7), 1 states have call predecessors, (7), 1 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) Second operand has 5 states, 5 states have (on average 1.0) internal successors, (5), 3 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:40:29,180 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:40:29,180 INFO L93 Difference]: Finished difference Result 51 states and 87 transitions. [2021-11-21 01:40:29,181 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-21 01:40:29,182 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.0) internal successors, (5), 3 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2021-11-21 01:40:29,183 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:40:29,190 INFO L225 Difference]: With dead ends: 51 [2021-11-21 01:40:29,190 INFO L226 Difference]: Without dead ends: 28 [2021-11-21 01:40:29,193 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-21 01:40:29,197 INFO L933 BasicCegarLoop]: 25 mSDtfsCounter, 11 mSDsluCounter, 63 mSDsCounter, 0 mSdLazyCounter, 27 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 83 SdHoareTripleChecker+Invalid, 31 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 27 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 01:40:29,198 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [18 Valid, 83 Invalid, 31 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 27 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 01:40:29,214 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2021-11-21 01:40:29,249 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 22. [2021-11-21 01:40:29,250 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 12 states have (on average 1.25) internal successors, (15), 13 states have internal predecessors, (15), 7 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-21 01:40:29,252 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 28 transitions. [2021-11-21 01:40:29,253 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 28 transitions. Word has length 6 [2021-11-21 01:40:29,253 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:40:29,253 INFO L470 AbstractCegarLoop]: Abstraction has 22 states and 28 transitions. [2021-11-21 01:40:29,254 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.0) internal successors, (5), 3 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:40:29,254 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 28 transitions. [2021-11-21 01:40:29,255 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-21 01:40:29,255 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:40:29,255 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:40:29,255 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-21 01:40:29,256 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:40:29,256 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:40:29,257 INFO L85 PathProgramCache]: Analyzing trace with hash -515229903, now seen corresponding path program 1 times [2021-11-21 01:40:29,259 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:40:29,260 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1192935286] [2021-11-21 01:40:29,260 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:40:29,260 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:40:29,282 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:40:29,378 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:40:29,379 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:40:29,379 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1192935286] [2021-11-21 01:40:29,379 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1192935286] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:40:29,379 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:40:29,380 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-21 01:40:29,380 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [413173935] [2021-11-21 01:40:29,380 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:40:29,381 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-21 01:40:29,382 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:40:29,382 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-21 01:40:29,382 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-21 01:40:29,383 INFO L87 Difference]: Start difference. First operand 22 states and 28 transitions. Second operand has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-21 01:40:29,493 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:40:29,494 INFO L93 Difference]: Finished difference Result 34 states and 43 transitions. [2021-11-21 01:40:29,495 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-21 01:40:29,495 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (2), 2 states have call predecessors, (2), 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 01:40:29,495 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:40:29,497 INFO L225 Difference]: With dead ends: 34 [2021-11-21 01:40:29,497 INFO L226 Difference]: Without dead ends: 32 [2021-11-21 01:40:29,498 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-21 01:40:29,502 INFO L933 BasicCegarLoop]: 24 mSDtfsCounter, 8 mSDsluCounter, 54 mSDsCounter, 0 mSdLazyCounter, 29 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 76 SdHoareTripleChecker+Invalid, 30 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 29 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:40:29,503 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [13 Valid, 76 Invalid, 30 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 29 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:40:29,504 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-11-21 01:40:29,511 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 26. [2021-11-21 01:40:29,514 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 15 states have (on average 1.2) internal successors, (18), 16 states have internal predecessors, (18), 7 states have call successors, (7), 3 states have call predecessors, (7), 3 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-21 01:40:29,519 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 31 transitions. [2021-11-21 01:40:29,520 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 31 transitions. Word has length 11 [2021-11-21 01:40:29,521 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:40:29,521 INFO L470 AbstractCegarLoop]: Abstraction has 26 states and 31 transitions. [2021-11-21 01:40:29,522 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-21 01:40:29,523 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 31 transitions. [2021-11-21 01:40:29,523 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-11-21 01:40:29,524 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:40:29,524 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:40:29,525 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-21 01:40:29,525 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:40:29,526 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:40:29,527 INFO L85 PathProgramCache]: Analyzing trace with hash -1604661492, now seen corresponding path program 1 times [2021-11-21 01:40:29,528 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:40:29,528 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [102999181] [2021-11-21 01:40:29,529 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:40:29,529 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:40:29,561 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:40:29,562 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [460773205] [2021-11-21 01:40:29,562 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:40:29,562 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:40:29,562 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df2124b1-d65b-44de-99c2-c9fd7d0c2b22/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:40:29,564 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df2124b1-d65b-44de-99c2-c9fd7d0c2b22/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:40:29,585 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df2124b1-d65b-44de-99c2-c9fd7d0c2b22/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-21 01:40:29,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:40:29,635 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-21 01:40:29,639 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:40:29,845 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-21 01:40:29,846 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 01:40:29,846 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:40:29,846 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [102999181] [2021-11-21 01:40:29,846 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:40:29,847 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [460773205] [2021-11-21 01:40:29,847 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [460773205] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:40:29,847 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:40:29,847 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-21 01:40:29,848 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [913354166] [2021-11-21 01:40:29,848 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:40:29,848 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-21 01:40:29,849 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:40:29,849 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-21 01:40:29,849 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-21 01:40:29,850 INFO L87 Difference]: Start difference. First operand 26 states and 31 transitions. Second operand has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-21 01:40:29,911 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:40:29,911 INFO L93 Difference]: Finished difference Result 53 states and 69 transitions. [2021-11-21 01:40:29,912 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-21 01:40:29,912 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 16 [2021-11-21 01:40:29,912 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:40:29,913 INFO L225 Difference]: With dead ends: 53 [2021-11-21 01:40:29,913 INFO L226 Difference]: Without dead ends: 40 [2021-11-21 01:40:29,914 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-21 01:40:29,916 INFO L933 BasicCegarLoop]: 25 mSDtfsCounter, 8 mSDsluCounter, 62 mSDsCounter, 0 mSdLazyCounter, 40 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 83 SdHoareTripleChecker+Invalid, 43 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 40 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 01:40:29,916 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 83 Invalid, 43 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 40 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 01:40:29,917 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2021-11-21 01:40:29,926 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2021-11-21 01:40:29,926 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 22 states have (on average 1.1818181818181819) internal successors, (26), 24 states have internal predecessors, (26), 13 states have call successors, (13), 4 states have call predecessors, (13), 4 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2021-11-21 01:40:29,928 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 50 transitions. [2021-11-21 01:40:29,928 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 50 transitions. Word has length 16 [2021-11-21 01:40:29,929 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:40:29,929 INFO L470 AbstractCegarLoop]: Abstraction has 40 states and 50 transitions. [2021-11-21 01:40:29,929 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-21 01:40:29,929 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 50 transitions. [2021-11-21 01:40:29,930 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-11-21 01:40:29,930 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:40:29,930 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:40:29,967 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df2124b1-d65b-44de-99c2-c9fd7d0c2b22/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2021-11-21 01:40:30,150 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df2124b1-d65b-44de-99c2-c9fd7d0c2b22/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:40:30,151 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:40:30,151 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:40:30,151 INFO L85 PathProgramCache]: Analyzing trace with hash -462181282, now seen corresponding path program 1 times [2021-11-21 01:40:30,151 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:40:30,152 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1079017967] [2021-11-21 01:40:30,152 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:40:30,152 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:40:30,163 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:40:30,163 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1510097359] [2021-11-21 01:40:30,163 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:40:30,164 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:40:30,164 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df2124b1-d65b-44de-99c2-c9fd7d0c2b22/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:40:30,167 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df2124b1-d65b-44de-99c2-c9fd7d0c2b22/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:40:30,196 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df2124b1-d65b-44de-99c2-c9fd7d0c2b22/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-21 01:40:30,220 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:40:30,221 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-21 01:40:30,222 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:40:30,347 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-21 01:40:30,347 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 01:40:30,348 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:40:30,352 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1079017967] [2021-11-21 01:40:30,352 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:40:30,352 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1510097359] [2021-11-21 01:40:30,354 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1510097359] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:40:30,354 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:40:30,355 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-21 01:40:30,356 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1140236224] [2021-11-21 01:40:30,356 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:40:30,356 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-21 01:40:30,357 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:40:30,357 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-21 01:40:30,357 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-21 01:40:30,357 INFO L87 Difference]: Start difference. First operand 40 states and 50 transitions. Second operand has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 1 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-21 01:40:30,437 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:40:30,438 INFO L93 Difference]: Finished difference Result 52 states and 65 transitions. [2021-11-21 01:40:30,438 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-21 01:40:30,438 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 1 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 23 [2021-11-21 01:40:30,439 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:40:30,443 INFO L225 Difference]: With dead ends: 52 [2021-11-21 01:40:30,444 INFO L226 Difference]: Without dead ends: 45 [2021-11-21 01:40:30,444 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-21 01:40:30,448 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 7 mSDsluCounter, 46 mSDsCounter, 0 mSdLazyCounter, 38 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 62 SdHoareTripleChecker+Invalid, 41 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 38 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 01:40:30,450 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 62 Invalid, 41 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 38 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 01:40:30,452 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2021-11-21 01:40:30,468 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 44. [2021-11-21 01:40:30,474 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 25 states have (on average 1.16) internal successors, (29), 27 states have internal predecessors, (29), 13 states have call successors, (13), 5 states have call predecessors, (13), 5 states have return successors, (12), 11 states have call predecessors, (12), 12 states have call successors, (12) [2021-11-21 01:40:30,476 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 54 transitions. [2021-11-21 01:40:30,476 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 54 transitions. Word has length 23 [2021-11-21 01:40:30,476 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:40:30,476 INFO L470 AbstractCegarLoop]: Abstraction has 44 states and 54 transitions. [2021-11-21 01:40:30,477 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 1 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-21 01:40:30,477 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 54 transitions. [2021-11-21 01:40:30,478 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-11-21 01:40:30,479 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:40:30,479 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 5, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1] [2021-11-21 01:40:30,513 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df2124b1-d65b-44de-99c2-c9fd7d0c2b22/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-21 01:40:30,693 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df2124b1-d65b-44de-99c2-c9fd7d0c2b22/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:40:30,693 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:40:30,694 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:40:30,694 INFO L85 PathProgramCache]: Analyzing trace with hash 1042343919, now seen corresponding path program 1 times [2021-11-21 01:40:30,694 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:40:30,694 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [994153835] [2021-11-21 01:40:30,694 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:40:30,694 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:40:30,705 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:40:30,706 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [553957379] [2021-11-21 01:40:30,708 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:40:30,708 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:40:30,708 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df2124b1-d65b-44de-99c2-c9fd7d0c2b22/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:40:30,709 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df2124b1-d65b-44de-99c2-c9fd7d0c2b22/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:40:30,741 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df2124b1-d65b-44de-99c2-c9fd7d0c2b22/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-21 01:40:30,772 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:40:30,773 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-21 01:40:30,776 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:40:30,985 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 10 proven. 4 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-21 01:40:30,986 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:40:31,120 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2021-11-21 01:40:31,120 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:40:31,120 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [994153835] [2021-11-21 01:40:31,121 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:40:31,121 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [553957379] [2021-11-21 01:40:31,121 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [553957379] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-21 01:40:31,121 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 01:40:31,121 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 7 [2021-11-21 01:40:31,122 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1716166646] [2021-11-21 01:40:31,122 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:40:31,122 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-21 01:40:31,142 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:40:31,143 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-21 01:40:31,143 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-11-21 01:40:31,143 INFO L87 Difference]: Start difference. First operand 44 states and 54 transitions. Second operand has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-21 01:40:31,307 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:40:31,308 INFO L93 Difference]: Finished difference Result 51 states and 60 transitions. [2021-11-21 01:40:31,308 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-21 01:40:31,308 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 33 [2021-11-21 01:40:31,309 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:40:31,309 INFO L225 Difference]: With dead ends: 51 [2021-11-21 01:40:31,309 INFO L226 Difference]: Without dead ends: 49 [2021-11-21 01:40:31,310 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 57 SyntacticMatches, 2 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-11-21 01:40:31,311 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 8 mSDsluCounter, 50 mSDsCounter, 0 mSdLazyCounter, 37 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 70 SdHoareTripleChecker+Invalid, 38 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 37 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:40:31,311 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [11 Valid, 70 Invalid, 38 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 37 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:40:31,312 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2021-11-21 01:40:31,318 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 48. [2021-11-21 01:40:31,319 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 28 states have (on average 1.1428571428571428) internal successors, (32), 30 states have internal predecessors, (32), 13 states have call successors, (13), 6 states have call predecessors, (13), 6 states have return successors, (12), 11 states have call predecessors, (12), 12 states have call successors, (12) [2021-11-21 01:40:31,320 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 57 transitions. [2021-11-21 01:40:31,320 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 57 transitions. Word has length 33 [2021-11-21 01:40:31,320 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:40:31,320 INFO L470 AbstractCegarLoop]: Abstraction has 48 states and 57 transitions. [2021-11-21 01:40:31,321 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-21 01:40:31,321 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 57 transitions. [2021-11-21 01:40:31,322 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-11-21 01:40:31,323 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:40:31,323 INFO L514 BasicCegarLoop]: trace histogram [9, 8, 8, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:40:31,357 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df2124b1-d65b-44de-99c2-c9fd7d0c2b22/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-21 01:40:31,549 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df2124b1-d65b-44de-99c2-c9fd7d0c2b22/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:40:31,549 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:40:31,550 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:40:31,550 INFO L85 PathProgramCache]: Analyzing trace with hash -1731990838, now seen corresponding path program 1 times [2021-11-21 01:40:31,550 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:40:31,550 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1463583642] [2021-11-21 01:40:31,550 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:40:31,551 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:40:31,571 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:40:31,576 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1025564357] [2021-11-21 01:40:31,576 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:40:31,576 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:40:31,576 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df2124b1-d65b-44de-99c2-c9fd7d0c2b22/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:40:31,577 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df2124b1-d65b-44de-99c2-c9fd7d0c2b22/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:40:31,613 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df2124b1-d65b-44de-99c2-c9fd7d0c2b22/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-21 01:40:31,662 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:40:31,664 INFO L263 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-21 01:40:31,667 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:40:32,210 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 16 proven. 7 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2021-11-21 01:40:32,211 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:40:34,828 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 16 proven. 7 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2021-11-21 01:40:34,828 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:40:34,828 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1463583642] [2021-11-21 01:40:34,828 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:40:34,829 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1025564357] [2021-11-21 01:40:34,829 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1025564357] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:40:34,829 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [798138073] [2021-11-21 01:40:34,848 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2021-11-21 01:40:34,849 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:40:34,852 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:40:34,857 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:40:34,858 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:40:59,847 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 17 for LOIs [2021-11-21 01:40:59,927 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:41:01,157 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:41:01,157 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-21 01:41:01,158 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2021-11-21 01:41:01,158 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1562265206] [2021-11-21 01:41:01,158 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-21 01:41:01,159 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-21 01:41:01,160 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:41:01,160 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-21 01:41:01,160 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=309, Unknown=0, NotChecked=0, Total=380 [2021-11-21 01:41:01,161 INFO L87 Difference]: Start difference. First operand 48 states and 57 transitions. Second operand has 10 states, 10 states have (on average 2.2) internal successors, (22), 9 states have internal predecessors, (22), 6 states have call successors, (18), 2 states have call predecessors, (18), 1 states have return successors, (16), 4 states have call predecessors, (16), 4 states have call successors, (16) [2021-11-21 01:41:04,395 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:41:04,395 INFO L93 Difference]: Finished difference Result 102 states and 121 transitions. [2021-11-21 01:41:04,395 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-21 01:41:04,396 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.2) internal successors, (22), 9 states have internal predecessors, (22), 6 states have call successors, (18), 2 states have call predecessors, (18), 1 states have return successors, (16), 4 states have call predecessors, (16), 4 states have call successors, (16) Word has length 52 [2021-11-21 01:41:04,396 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:41:04,397 INFO L225 Difference]: With dead ends: 102 [2021-11-21 01:41:04,397 INFO L226 Difference]: Without dead ends: 90 [2021-11-21 01:41:04,398 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 134 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 107 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=102, Invalid=450, Unknown=0, NotChecked=0, Total=552 [2021-11-21 01:41:04,399 INFO L933 BasicCegarLoop]: 31 mSDtfsCounter, 24 mSDsluCounter, 155 mSDsCounter, 0 mSdLazyCounter, 152 mSolverCounterSat, 56 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 184 SdHoareTripleChecker+Invalid, 208 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 56 IncrementalHoareTripleChecker+Valid, 152 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-21 01:41:04,399 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [24 Valid, 184 Invalid, 208 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [56 Valid, 152 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-21 01:41:04,400 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2021-11-21 01:41:04,412 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 83. [2021-11-21 01:41:04,412 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 50 states have (on average 1.12) internal successors, (56), 53 states have internal predecessors, (56), 21 states have call successors, (21), 11 states have call predecessors, (21), 11 states have return successors, (20), 18 states have call predecessors, (20), 20 states have call successors, (20) [2021-11-21 01:41:04,413 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 97 transitions. [2021-11-21 01:41:04,414 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 97 transitions. Word has length 52 [2021-11-21 01:41:04,414 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:41:04,414 INFO L470 AbstractCegarLoop]: Abstraction has 83 states and 97 transitions. [2021-11-21 01:41:04,415 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 2.2) internal successors, (22), 9 states have internal predecessors, (22), 6 states have call successors, (18), 2 states have call predecessors, (18), 1 states have return successors, (16), 4 states have call predecessors, (16), 4 states have call successors, (16) [2021-11-21 01:41:04,415 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 97 transitions. [2021-11-21 01:41:04,417 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-11-21 01:41:04,417 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:41:04,417 INFO L514 BasicCegarLoop]: trace histogram [10, 9, 9, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:41:04,443 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df2124b1-d65b-44de-99c2-c9fd7d0c2b22/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-21 01:41:04,625 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df2124b1-d65b-44de-99c2-c9fd7d0c2b22/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-11-21 01:41:04,626 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:41:04,627 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:41:04,627 INFO L85 PathProgramCache]: Analyzing trace with hash 625517203, now seen corresponding path program 2 times [2021-11-21 01:41:04,627 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:41:04,627 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [895495599] [2021-11-21 01:41:04,628 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:41:04,630 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:41:04,647 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:41:04,661 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1859235090] [2021-11-21 01:41:04,661 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:41:04,661 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:41:04,661 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df2124b1-d65b-44de-99c2-c9fd7d0c2b22/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:41:04,662 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df2124b1-d65b-44de-99c2-c9fd7d0c2b22/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:41:04,668 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df2124b1-d65b-44de-99c2-c9fd7d0c2b22/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-21 01:41:04,725 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-21 01:41:04,725 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:41:04,743 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-21 01:41:04,746 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:41:05,127 INFO L134 CoverageAnalysis]: Checked inductivity of 170 backedges. 18 proven. 8 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2021-11-21 01:41:05,128 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:41:06,630 INFO L134 CoverageAnalysis]: Checked inductivity of 170 backedges. 18 proven. 8 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2021-11-21 01:41:06,630 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:41:06,631 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [895495599] [2021-11-21 01:41:06,631 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:41:06,631 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1859235090] [2021-11-21 01:41:06,631 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1859235090] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:41:06,631 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [602574463] [2021-11-21 01:41:06,633 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2021-11-21 01:41:06,633 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:41:06,633 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:41:06,633 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:41:06,633 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:41:17,228 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2021-11-21 01:41:17,315 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:41:18,264 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:41:18,264 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-21 01:41:18,264 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 8 [2021-11-21 01:41:18,265 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [954251493] [2021-11-21 01:41:18,265 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-21 01:41:18,265 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-21 01:41:18,265 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:41:18,266 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-21 01:41:18,266 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=243, Unknown=0, NotChecked=0, Total=306 [2021-11-21 01:41:18,266 INFO L87 Difference]: Start difference. First operand 83 states and 97 transitions. Second operand has 8 states, 8 states have (on average 2.75) internal successors, (22), 7 states have internal predecessors, (22), 4 states have call successors, (20), 2 states have call predecessors, (20), 1 states have return successors, (18), 4 states have call predecessors, (18), 4 states have call successors, (18) [2021-11-21 01:41:19,896 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:41:19,897 INFO L93 Difference]: Finished difference Result 112 states and 133 transitions. [2021-11-21 01:41:19,897 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-21 01:41:19,897 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.75) internal successors, (22), 7 states have internal predecessors, (22), 4 states have call successors, (20), 2 states have call predecessors, (20), 1 states have return successors, (18), 4 states have call predecessors, (18), 4 states have call successors, (18) Word has length 57 [2021-11-21 01:41:19,898 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:41:19,898 INFO L225 Difference]: With dead ends: 112 [2021-11-21 01:41:19,899 INFO L226 Difference]: Without dead ends: 93 [2021-11-21 01:41:19,899 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 171 GetRequests, 150 SyntacticMatches, 3 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 90 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=77, Invalid=303, Unknown=0, NotChecked=0, Total=380 [2021-11-21 01:41:19,900 INFO L933 BasicCegarLoop]: 38 mSDtfsCounter, 13 mSDsluCounter, 109 mSDsCounter, 0 mSdLazyCounter, 97 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 145 SdHoareTripleChecker+Invalid, 114 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 97 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 01:41:19,901 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [17 Valid, 145 Invalid, 114 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 97 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-21 01:41:19,901 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2021-11-21 01:41:19,916 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 89. [2021-11-21 01:41:19,916 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 89 states, 53 states have (on average 1.0943396226415094) internal successors, (58), 57 states have internal predecessors, (58), 23 states have call successors, (23), 12 states have call predecessors, (23), 12 states have return successors, (21), 19 states have call predecessors, (21), 21 states have call successors, (21) [2021-11-21 01:41:19,918 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 102 transitions. [2021-11-21 01:41:19,918 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 102 transitions. Word has length 57 [2021-11-21 01:41:19,919 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:41:19,919 INFO L470 AbstractCegarLoop]: Abstraction has 89 states and 102 transitions. [2021-11-21 01:41:19,919 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.75) internal successors, (22), 7 states have internal predecessors, (22), 4 states have call successors, (20), 2 states have call predecessors, (20), 1 states have return successors, (18), 4 states have call predecessors, (18), 4 states have call successors, (18) [2021-11-21 01:41:19,919 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 102 transitions. [2021-11-21 01:41:19,921 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-11-21 01:41:19,921 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:41:19,921 INFO L514 BasicCegarLoop]: trace histogram [11, 10, 10, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:41:19,945 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df2124b1-d65b-44de-99c2-c9fd7d0c2b22/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-21 01:41:20,125 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df2124b1-d65b-44de-99c2-c9fd7d0c2b22/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:41:20,125 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:41:20,126 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:41:20,126 INFO L85 PathProgramCache]: Analyzing trace with hash -1143375622, now seen corresponding path program 1 times [2021-11-21 01:41:20,126 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:41:20,126 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [623177113] [2021-11-21 01:41:20,126 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:41:20,126 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:41:20,132 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:41:20,132 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [640493643] [2021-11-21 01:41:20,132 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:41:20,132 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:41:20,133 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df2124b1-d65b-44de-99c2-c9fd7d0c2b22/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:41:20,148 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df2124b1-d65b-44de-99c2-c9fd7d0c2b22/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:41:20,152 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df2124b1-d65b-44de-99c2-c9fd7d0c2b22/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-21 01:41:20,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:41:20,195 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 35 conjunts are in the unsatisfiable core [2021-11-21 01:41:20,198 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:41:20,753 INFO L134 CoverageAnalysis]: Checked inductivity of 209 backedges. 66 proven. 11 refuted. 0 times theorem prover too weak. 132 trivial. 0 not checked. [2021-11-21 01:41:20,753 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:41:21,019 INFO L134 CoverageAnalysis]: Checked inductivity of 209 backedges. 68 proven. 2 refuted. 0 times theorem prover too weak. 139 trivial. 0 not checked. [2021-11-21 01:41:21,019 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:41:21,020 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [623177113] [2021-11-21 01:41:21,020 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:41:21,020 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [640493643] [2021-11-21 01:41:21,020 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [640493643] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:41:21,020 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1269080416] [2021-11-21 01:41:21,023 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-21 01:41:21,023 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:41:21,023 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:41:21,023 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:41:21,024 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:41:36,693 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 22 for LOIs [2021-11-21 01:41:36,785 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:41:37,964 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:41:37,964 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-21 01:41:37,965 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 9] total 17 [2021-11-21 01:41:37,965 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1081626495] [2021-11-21 01:41:37,965 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-21 01:41:37,965 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-21 01:41:37,965 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:41:37,966 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-21 01:41:37,966 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=116, Invalid=640, Unknown=0, NotChecked=0, Total=756 [2021-11-21 01:41:37,966 INFO L87 Difference]: Start difference. First operand 89 states and 102 transitions. Second operand has 17 states, 13 states have (on average 2.076923076923077) internal successors, (27), 12 states have internal predecessors, (27), 9 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (17), 8 states have call predecessors, (17), 7 states have call successors, (17) [2021-11-21 01:41:38,506 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:41:38,507 INFO L93 Difference]: Finished difference Result 116 states and 132 transitions. [2021-11-21 01:41:38,509 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-21 01:41:38,509 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 13 states have (on average 2.076923076923077) internal successors, (27), 12 states have internal predecessors, (27), 9 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (17), 8 states have call predecessors, (17), 7 states have call successors, (17) Word has length 63 [2021-11-21 01:41:38,510 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:41:38,512 INFO L225 Difference]: With dead ends: 116 [2021-11-21 01:41:38,513 INFO L226 Difference]: Without dead ends: 93 [2021-11-21 01:41:38,514 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 192 GetRequests, 158 SyntacticMatches, 3 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 297 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=151, Invalid=905, Unknown=0, NotChecked=0, Total=1056 [2021-11-21 01:41:38,514 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 30 mSDsluCounter, 157 mSDsCounter, 0 mSdLazyCounter, 341 mSolverCounterSat, 37 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 171 SdHoareTripleChecker+Invalid, 378 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 37 IncrementalHoareTripleChecker+Valid, 341 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-21 01:41:38,515 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [42 Valid, 171 Invalid, 378 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [37 Valid, 341 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-21 01:41:38,516 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2021-11-21 01:41:38,529 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 79. [2021-11-21 01:41:38,529 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 49 states have (on average 1.0816326530612246) internal successors, (53), 51 states have internal predecessors, (53), 17 states have call successors, (17), 12 states have call predecessors, (17), 12 states have return successors, (16), 15 states have call predecessors, (16), 16 states have call successors, (16) [2021-11-21 01:41:38,530 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 86 transitions. [2021-11-21 01:41:38,530 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 86 transitions. Word has length 63 [2021-11-21 01:41:38,531 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:41:38,531 INFO L470 AbstractCegarLoop]: Abstraction has 79 states and 86 transitions. [2021-11-21 01:41:38,531 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 13 states have (on average 2.076923076923077) internal successors, (27), 12 states have internal predecessors, (27), 9 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (17), 8 states have call predecessors, (17), 7 states have call successors, (17) [2021-11-21 01:41:38,531 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 86 transitions. [2021-11-21 01:41:38,533 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-11-21 01:41:38,533 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:41:38,533 INFO L514 BasicCegarLoop]: trace histogram [13, 12, 12, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:41:38,566 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df2124b1-d65b-44de-99c2-c9fd7d0c2b22/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2021-11-21 01:41:38,752 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df2124b1-d65b-44de-99c2-c9fd7d0c2b22/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:41:38,754 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:41:38,754 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:41:38,755 INFO L85 PathProgramCache]: Analyzing trace with hash 2113244439, now seen corresponding path program 1 times [2021-11-21 01:41:38,755 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:41:38,755 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [483619525] [2021-11-21 01:41:38,755 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:41:38,755 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:41:38,761 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:41:38,761 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2106515499] [2021-11-21 01:41:38,761 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:41:38,761 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:41:38,761 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df2124b1-d65b-44de-99c2-c9fd7d0c2b22/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:41:38,771 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df2124b1-d65b-44de-99c2-c9fd7d0c2b22/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:41:38,803 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df2124b1-d65b-44de-99c2-c9fd7d0c2b22/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-21 01:41:38,829 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:41:38,830 INFO L263 TraceCheckSpWp]: Trace formula consists of 176 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-21 01:41:38,832 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:41:38,996 INFO L134 CoverageAnalysis]: Checked inductivity of 303 backedges. 81 proven. 0 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2021-11-21 01:41:38,996 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 01:41:38,996 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:41:38,996 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [483619525] [2021-11-21 01:41:38,996 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:41:38,996 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2106515499] [2021-11-21 01:41:38,996 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2106515499] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:41:38,996 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:41:38,996 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-21 01:41:38,996 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1598081169] [2021-11-21 01:41:38,997 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:41:38,997 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-21 01:41:38,997 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:41:38,998 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-21 01:41:38,998 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-11-21 01:41:38,998 INFO L87 Difference]: Start difference. First operand 79 states and 86 transitions. Second operand has 5 states, 5 states have (on average 3.4) internal successors, (17), 5 states have internal predecessors, (17), 4 states have call successors, (13), 2 states have call predecessors, (13), 2 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2021-11-21 01:41:39,079 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:41:39,079 INFO L93 Difference]: Finished difference Result 92 states and 99 transitions. [2021-11-21 01:41:39,080 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-21 01:41:39,080 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.4) internal successors, (17), 5 states have internal predecessors, (17), 4 states have call successors, (13), 2 states have call predecessors, (13), 2 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) Word has length 73 [2021-11-21 01:41:39,081 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:41:39,082 INFO L225 Difference]: With dead ends: 92 [2021-11-21 01:41:39,082 INFO L226 Difference]: Without dead ends: 80 [2021-11-21 01:41:39,082 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 69 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-11-21 01:41:39,085 INFO L933 BasicCegarLoop]: 39 mSDtfsCounter, 8 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 22 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 61 SdHoareTripleChecker+Invalid, 34 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 22 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:41:39,086 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [13 Valid, 61 Invalid, 34 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 22 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:41:39,086 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2021-11-21 01:41:39,110 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 80. [2021-11-21 01:41:39,111 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 50 states have (on average 1.06) internal successors, (53), 51 states have internal predecessors, (53), 17 states have call successors, (17), 12 states have call predecessors, (17), 12 states have return successors, (16), 16 states have call predecessors, (16), 16 states have call successors, (16) [2021-11-21 01:41:39,114 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 86 transitions. [2021-11-21 01:41:39,115 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 86 transitions. Word has length 73 [2021-11-21 01:41:39,115 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:41:39,115 INFO L470 AbstractCegarLoop]: Abstraction has 80 states and 86 transitions. [2021-11-21 01:41:39,115 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.4) internal successors, (17), 5 states have internal predecessors, (17), 4 states have call successors, (13), 2 states have call predecessors, (13), 2 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2021-11-21 01:41:39,116 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 86 transitions. [2021-11-21 01:41:39,117 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-11-21 01:41:39,118 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:41:39,118 INFO L514 BasicCegarLoop]: trace histogram [14, 13, 13, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1] [2021-11-21 01:41:39,140 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df2124b1-d65b-44de-99c2-c9fd7d0c2b22/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-21 01:41:39,323 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df2124b1-d65b-44de-99c2-c9fd7d0c2b22/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:41:39,323 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:41:39,323 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:41:39,323 INFO L85 PathProgramCache]: Analyzing trace with hash 1175687132, now seen corresponding path program 3 times [2021-11-21 01:41:39,323 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:41:39,324 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1750006285] [2021-11-21 01:41:39,324 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:41:39,324 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:41:39,329 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:41:39,329 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [239041506] [2021-11-21 01:41:39,330 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:41:39,330 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:41:39,330 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df2124b1-d65b-44de-99c2-c9fd7d0c2b22/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:41:39,331 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df2124b1-d65b-44de-99c2-c9fd7d0c2b22/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:41:39,333 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df2124b1-d65b-44de-99c2-c9fd7d0c2b22/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-21 01:41:39,395 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:41:39,395 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:41:39,396 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 53 conjunts are in the unsatisfiable core [2021-11-21 01:41:39,399 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:41:47,190 WARN L838 $PredicateComparison]: unable to prove that (let ((.cse2 (div |c_ULTIMATE.start_main_~d~0#1| 2))) (let ((.cse0 (* 2 (div .cse2 |c_ULTIMATE.start_main_~B~0#1|)))) (and (< |c_ULTIMATE.start_main_~A~0#1| (* 4 (* (div |c_ULTIMATE.start_main_~p~0#1| 2) |c_ULTIMATE.start_main_~B~0#1|))) (or (and (= (+ |c_ULTIMATE.start_main_~d~0#1| |c_ULTIMATE.start_main_~r~0#1|) |c_ULTIMATE.start_main_~A~0#1|) (= |c_ULTIMATE.start_main_~p~0#1| |c_ULTIMATE.start_main_~q~0#1|) (<= |c_ULTIMATE.start_main_~d~0#1| |c_ULTIMATE.start_main_~A~0#1|)) (and (= |c_ULTIMATE.start_main_~q~0#1| 0) (= |c_ULTIMATE.start_main_~A~0#1| |c_ULTIMATE.start_main_~r~0#1|) (< |c_ULTIMATE.start_main_~A~0#1| |c_ULTIMATE.start_main_~d~0#1|))) (< (div (+ (* |c_ULTIMATE.start_main_~p~0#1| (- 2)) 1) (- 4)) (+ (div (* |c_ULTIMATE.start_main_~p~0#1| 2) 4) 1)) (not (= |c_ULTIMATE.start_main_~B~0#1| 0)) (<= .cse0 |c_ULTIMATE.start_main_~p~0#1|) (< |c_ULTIMATE.start_main_~p~0#1| (+ 2 .cse0)) (exists ((|aux_div_aux_div_aux_mod_aux_mod_aux_mod_v_ULTIMATE.start_main_~p~0#1_64_41_118_216_76_130| Int)) (let ((.cse1 (* 2 |aux_div_aux_div_aux_mod_aux_mod_aux_mod_v_ULTIMATE.start_main_~p~0#1_64_41_118_216_76_130|))) (and (< |c_ULTIMATE.start_main_~p~0#1| (+ 2 .cse1)) (<= (* 2 (* |c_ULTIMATE.start_main_~B~0#1| |aux_div_aux_div_aux_mod_aux_mod_aux_mod_v_ULTIMATE.start_main_~p~0#1_64_41_118_216_76_130|)) |c_ULTIMATE.start_main_~A~0#1|) (<= .cse1 |c_ULTIMATE.start_main_~p~0#1|)))) (= (mod .cse2 |c_ULTIMATE.start_main_~B~0#1|) 0) (= (mod |c_ULTIMATE.start_main_~d~0#1| 2) 0)))) is different from false [2021-11-21 01:41:57,634 WARN L838 $PredicateComparison]: unable to prove that (let ((.cse2 (div |c_ULTIMATE.start_main_~d~0#1| 2))) (let ((.cse0 (* 2 (div .cse2 |c_ULTIMATE.start_main_~B~0#1|)))) (and (< |c_ULTIMATE.start_main_~A~0#1| (* 4 (* (div |c_ULTIMATE.start_main_~p~0#1| 2) |c_ULTIMATE.start_main_~B~0#1|))) (or (and (= |c_ULTIMATE.start_main_~p~0#1| |c_ULTIMATE.start_main_~q~0#1|) (<= |c_ULTIMATE.start_main_~d~0#1| |c_ULTIMATE.start_main_~A~0#1|)) (and (= |c_ULTIMATE.start_main_~A~0#1| |c_ULTIMATE.start_main_~r~0#1|) (< |c_ULTIMATE.start_main_~A~0#1| |c_ULTIMATE.start_main_~d~0#1|))) (< (div (+ (* |c_ULTIMATE.start_main_~p~0#1| (- 2)) 1) (- 4)) (+ (div (* |c_ULTIMATE.start_main_~p~0#1| 2) 4) 1)) (not (= |c_ULTIMATE.start_main_~B~0#1| 0)) (= (+ (* |c_ULTIMATE.start_main_~q~0#1| |c_ULTIMATE.start_main_~B~0#1|) |c_ULTIMATE.start_main_~r~0#1|) |c_ULTIMATE.start_main_~A~0#1|) (<= .cse0 |c_ULTIMATE.start_main_~p~0#1|) (< |c_ULTIMATE.start_main_~p~0#1| (+ 2 .cse0)) (exists ((|aux_div_aux_div_aux_mod_aux_mod_aux_mod_v_ULTIMATE.start_main_~p~0#1_64_41_118_216_76_130| Int)) (let ((.cse1 (* 2 |aux_div_aux_div_aux_mod_aux_mod_aux_mod_v_ULTIMATE.start_main_~p~0#1_64_41_118_216_76_130|))) (and (< |c_ULTIMATE.start_main_~p~0#1| (+ 2 .cse1)) (<= (* 2 (* |c_ULTIMATE.start_main_~B~0#1| |aux_div_aux_div_aux_mod_aux_mod_aux_mod_v_ULTIMATE.start_main_~p~0#1_64_41_118_216_76_130|)) |c_ULTIMATE.start_main_~A~0#1|) (<= .cse1 |c_ULTIMATE.start_main_~p~0#1|)))) (= (mod .cse2 |c_ULTIMATE.start_main_~B~0#1|) 0) (= (mod |c_ULTIMATE.start_main_~d~0#1| 2) 0)))) is different from false