./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/combinations/Problem05_label45+token_ring.14.cil.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 0f8a17c6 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c3b0249c-1470-41ec-89e7-b7780898d496/bin/utaipan-UbGMyvGFUs/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c3b0249c-1470-41ec-89e7-b7780898d496/bin/utaipan-UbGMyvGFUs/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c3b0249c-1470-41ec-89e7-b7780898d496/bin/utaipan-UbGMyvGFUs/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c3b0249c-1470-41ec-89e7-b7780898d496/bin/utaipan-UbGMyvGFUs/config/TaipanReach.xml -i ../../sv-benchmarks/c/combinations/Problem05_label45+token_ring.14.cil.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c3b0249c-1470-41ec-89e7-b7780898d496/bin/utaipan-UbGMyvGFUs/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c3b0249c-1470-41ec-89e7-b7780898d496/bin/utaipan-UbGMyvGFUs --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 5c885e36ce67f972719c7330e2fdf8e1794f0d30dd144b261109fa7b0892a972 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-0f8a17c [2021-11-19 14:39:22,575 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-19 14:39:22,578 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-19 14:39:22,658 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-19 14:39:22,659 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-19 14:39:22,666 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-19 14:39:22,668 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-19 14:39:22,674 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-19 14:39:22,677 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-19 14:39:22,684 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-19 14:39:22,686 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-19 14:39:22,689 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-19 14:39:22,689 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-19 14:39:22,693 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-19 14:39:22,696 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-19 14:39:22,702 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-19 14:39:22,704 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-19 14:39:22,706 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-19 14:39:22,709 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-19 14:39:22,722 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-19 14:39:22,725 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-19 14:39:22,727 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-19 14:39:22,731 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-19 14:39:22,733 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-19 14:39:22,738 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-19 14:39:22,739 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-19 14:39:22,739 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-19 14:39:22,742 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-19 14:39:22,742 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-19 14:39:22,744 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-19 14:39:22,745 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-19 14:39:22,746 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-19 14:39:22,749 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-19 14:39:22,751 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-19 14:39:22,753 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-19 14:39:22,753 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-19 14:39:22,754 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-19 14:39:22,754 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-19 14:39:22,755 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-19 14:39:22,756 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-19 14:39:22,757 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-19 14:39:22,758 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c3b0249c-1470-41ec-89e7-b7780898d496/bin/utaipan-UbGMyvGFUs/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-19 14:39:22,819 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-19 14:39:22,819 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-19 14:39:22,821 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-19 14:39:22,821 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-19 14:39:22,822 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-19 14:39:22,822 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-19 14:39:22,822 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-19 14:39:22,823 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-19 14:39:22,823 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-19 14:39:22,823 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-19 14:39:22,825 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-19 14:39:22,825 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-19 14:39:22,825 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-19 14:39:22,826 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-19 14:39:22,826 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-19 14:39:22,826 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2021-11-19 14:39:22,828 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-19 14:39:22,828 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-19 14:39:22,828 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-19 14:39:22,828 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-19 14:39:22,829 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-19 14:39:22,829 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-19 14:39:22,829 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-19 14:39:22,830 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-19 14:39:22,830 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-19 14:39:22,830 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-19 14:39:22,830 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-19 14:39:22,831 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-19 14:39:22,831 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-19 14:39:22,833 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-19 14:39:22,834 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-19 14:39:22,834 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-19 14:39:22,835 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-19 14:39:22,835 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-19 14:39:22,835 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-19 14:39:22,835 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-19 14:39:22,836 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-19 14:39:22,836 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-19 14:39:22,836 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-19 14:39:22,837 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-19 14:39:22,837 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_c3b0249c-1470-41ec-89e7-b7780898d496/bin/utaipan-UbGMyvGFUs/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c3b0249c-1470-41ec-89e7-b7780898d496/bin/utaipan-UbGMyvGFUs Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 5c885e36ce67f972719c7330e2fdf8e1794f0d30dd144b261109fa7b0892a972 [2021-11-19 14:39:23,257 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-19 14:39:23,293 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-19 14:39:23,296 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-19 14:39:23,298 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-19 14:39:23,299 INFO L275 PluginConnector]: CDTParser initialized [2021-11-19 14:39:23,301 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c3b0249c-1470-41ec-89e7-b7780898d496/bin/utaipan-UbGMyvGFUs/../../sv-benchmarks/c/combinations/Problem05_label45+token_ring.14.cil.c [2021-11-19 14:39:23,383 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c3b0249c-1470-41ec-89e7-b7780898d496/bin/utaipan-UbGMyvGFUs/data/50ee65ddc/bfb848bca7fc444a9aade7a6281ff66c/FLAG5ed1d132a [2021-11-19 14:39:24,706 INFO L306 CDTParser]: Found 1 translation units. [2021-11-19 14:39:24,707 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c3b0249c-1470-41ec-89e7-b7780898d496/sv-benchmarks/c/combinations/Problem05_label45+token_ring.14.cil.c [2021-11-19 14:39:24,783 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c3b0249c-1470-41ec-89e7-b7780898d496/bin/utaipan-UbGMyvGFUs/data/50ee65ddc/bfb848bca7fc444a9aade7a6281ff66c/FLAG5ed1d132a [2021-11-19 14:39:24,909 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c3b0249c-1470-41ec-89e7-b7780898d496/bin/utaipan-UbGMyvGFUs/data/50ee65ddc/bfb848bca7fc444a9aade7a6281ff66c [2021-11-19 14:39:24,913 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-19 14:39:24,915 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-19 14:39:24,917 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-19 14:39:24,917 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-19 14:39:24,923 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-19 14:39:24,924 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 02:39:24" (1/1) ... [2021-11-19 14:39:24,926 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@33969190 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 02:39:24, skipping insertion in model container [2021-11-19 14:39:24,926 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 02:39:24" (1/1) ... [2021-11-19 14:39:24,935 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-19 14:39:25,241 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-19 14:39:28,539 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_c3b0249c-1470-41ec-89e7-b7780898d496/sv-benchmarks/c/combinations/Problem05_label45+token_ring.14.cil.c[380323,380336] [2021-11-19 14:39:28,590 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_c3b0249c-1470-41ec-89e7-b7780898d496/sv-benchmarks/c/combinations/Problem05_label45+token_ring.14.cil.c[383339,383352] [2021-11-19 14:39:29,058 INFO L207 PostProcessor]: Analyzing one entry point: main [2021-11-19 14:39:29,072 INFO L203 MainTranslator]: Completed pre-run [2021-11-19 14:39:30,634 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_c3b0249c-1470-41ec-89e7-b7780898d496/sv-benchmarks/c/combinations/Problem05_label45+token_ring.14.cil.c[380323,380336] [2021-11-19 14:39:30,641 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_c3b0249c-1470-41ec-89e7-b7780898d496/sv-benchmarks/c/combinations/Problem05_label45+token_ring.14.cil.c[383339,383352] [2021-11-19 14:39:30,673 INFO L207 PostProcessor]: Analyzing one entry point: main [2021-11-19 14:39:30,781 INFO L208 MainTranslator]: Completed translation [2021-11-19 14:39:30,782 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 02:39:30 WrapperNode [2021-11-19 14:39:30,782 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-19 14:39:30,783 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-19 14:39:30,784 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-19 14:39:30,784 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-19 14:39:30,794 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 02:39:30" (1/1) ... [2021-11-19 14:39:30,930 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 02:39:30" (1/1) ... [2021-11-19 14:39:31,788 INFO L137 Inliner]: procedures = 68, calls = 78, calls flagged for inlining = 45, calls inlined = 45, statements flattened = 13202 [2021-11-19 14:39:31,789 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-19 14:39:31,790 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-19 14:39:31,790 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-19 14:39:31,791 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-19 14:39:31,807 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 02:39:30" (1/1) ... [2021-11-19 14:39:31,819 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 02:39:30" (1/1) ... [2021-11-19 14:39:31,915 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 02:39:30" (1/1) ... [2021-11-19 14:39:31,916 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 02:39:30" (1/1) ... [2021-11-19 14:39:32,156 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 02:39:30" (1/1) ... [2021-11-19 14:39:32,236 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 02:39:30" (1/1) ... [2021-11-19 14:39:32,266 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 02:39:30" (1/1) ... [2021-11-19 14:39:32,497 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-19 14:39:32,498 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-19 14:39:32,499 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-19 14:39:32,499 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-19 14:39:32,500 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 02:39:30" (1/1) ... [2021-11-19 14:39:32,535 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-19 14:39:32,565 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c3b0249c-1470-41ec-89e7-b7780898d496/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 14:39:32,609 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c3b0249c-1470-41ec-89e7-b7780898d496/bin/utaipan-UbGMyvGFUs/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-19 14:39:32,679 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c3b0249c-1470-41ec-89e7-b7780898d496/bin/utaipan-UbGMyvGFUs/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-19 14:39:32,778 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-19 14:39:32,778 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads [2021-11-19 14:39:32,778 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads [2021-11-19 14:39:32,779 INFO L130 BoogieDeclarations]: Found specification of procedure immediate_notify [2021-11-19 14:39:32,779 INFO L138 BoogieDeclarations]: Found implementation of procedure immediate_notify [2021-11-19 14:39:32,779 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels [2021-11-19 14:39:32,779 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels [2021-11-19 14:39:32,779 INFO L130 BoogieDeclarations]: Found specification of procedure error [2021-11-19 14:39:32,780 INFO L138 BoogieDeclarations]: Found implementation of procedure error [2021-11-19 14:39:32,780 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events [2021-11-19 14:39:32,780 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events [2021-11-19 14:39:32,780 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread [2021-11-19 14:39:32,780 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread [2021-11-19 14:39:32,781 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events [2021-11-19 14:39:32,781 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events [2021-11-19 14:39:32,781 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-19 14:39:32,781 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-19 14:39:32,781 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-19 14:39:33,017 INFO L236 CfgBuilder]: Building ICFG [2021-11-19 14:39:33,019 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-19 14:39:43,184 INFO L277 CfgBuilder]: Performing block encoding [2021-11-19 14:39:46,637 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-19 14:39:46,637 INFO L301 CfgBuilder]: Removed 16 assume(true) statements. [2021-11-19 14:39:46,646 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 02:39:46 BoogieIcfgContainer [2021-11-19 14:39:46,646 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-19 14:39:46,649 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-19 14:39:46,649 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-19 14:39:46,655 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-19 14:39:46,656 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.11 02:39:24" (1/3) ... [2021-11-19 14:39:46,657 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@60bdffd5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 02:39:46, skipping insertion in model container [2021-11-19 14:39:46,657 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 02:39:30" (2/3) ... [2021-11-19 14:39:46,658 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@60bdffd5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 02:39:46, skipping insertion in model container [2021-11-19 14:39:46,658 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 02:39:46" (3/3) ... [2021-11-19 14:39:46,660 INFO L111 eAbstractionObserver]: Analyzing ICFG Problem05_label45+token_ring.14.cil.c [2021-11-19 14:39:46,668 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-19 14:39:46,668 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2021-11-19 14:39:46,766 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-19 14:39:46,778 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 [2021-11-19 14:39:46,778 INFO L340 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-11-19 14:39:46,887 INFO L276 IsEmpty]: Start isEmpty. Operand has 1837 states, 1799 states have (on average 1.9560867148415786) internal successors, (3519), 1804 states have internal predecessors, (3519), 28 states have call successors, (28), 7 states have call predecessors, (28), 7 states have return successors, (28), 27 states have call predecessors, (28), 28 states have call successors, (28) [2021-11-19 14:39:46,908 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-11-19 14:39:46,908 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 14:39:46,909 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 14:39:46,910 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 14:39:46,918 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 14:39:46,919 INFO L85 PathProgramCache]: Analyzing trace with hash -173092528, now seen corresponding path program 1 times [2021-11-19 14:39:46,934 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 14:39:46,935 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2043173090] [2021-11-19 14:39:46,935 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 14:39:46,937 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 14:39:47,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:39:47,570 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 14:39:47,571 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 14:39:47,572 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2043173090] [2021-11-19 14:39:47,573 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2043173090] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 14:39:47,579 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-19 14:39:47,580 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-19 14:39:47,582 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1653195818] [2021-11-19 14:39:47,583 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 14:39:47,589 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-19 14:39:47,589 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 14:39:47,667 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-19 14:39:47,684 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-19 14:39:47,694 INFO L87 Difference]: Start difference. First operand has 1837 states, 1799 states have (on average 1.9560867148415786) internal successors, (3519), 1804 states have internal predecessors, (3519), 28 states have call successors, (28), 7 states have call predecessors, (28), 7 states have return successors, (28), 27 states have call predecessors, (28), 28 states have call successors, (28) Second operand has 4 states, 4 states have (on average 14.25) internal successors, (57), 4 states have internal predecessors, (57), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-19 14:39:49,105 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 14:39:49,105 INFO L93 Difference]: Finished difference Result 3844 states and 7447 transitions. [2021-11-19 14:39:49,107 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-19 14:39:49,109 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 14.25) internal successors, (57), 4 states have internal predecessors, (57), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 68 [2021-11-19 14:39:49,110 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 14:39:49,142 INFO L225 Difference]: With dead ends: 3844 [2021-11-19 14:39:49,142 INFO L226 Difference]: Without dead ends: 2006 [2021-11-19 14:39:49,154 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-19 14:39:49,159 INFO L933 BasicCegarLoop]: 3519 mSDtfsCounter, 3787 mSDsluCounter, 3727 mSDsCounter, 0 mSdLazyCounter, 728 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3787 SdHoareTripleChecker+Valid, 6938 SdHoareTripleChecker+Invalid, 742 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 728 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2021-11-19 14:39:49,161 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3787 Valid, 6938 Invalid, 742 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [14 Valid, 728 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2021-11-19 14:39:49,190 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2006 states. [2021-11-19 14:39:49,366 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2006 to 2005. [2021-11-19 14:39:49,376 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2005 states, 1941 states have (on average 1.919629057187017) internal successors, (3726), 1945 states have internal predecessors, (3726), 50 states have call successors, (50), 13 states have call predecessors, (50), 12 states have return successors, (48), 47 states have call predecessors, (48), 48 states have call successors, (48) [2021-11-19 14:39:49,412 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2005 states to 2005 states and 3824 transitions. [2021-11-19 14:39:49,415 INFO L78 Accepts]: Start accepts. Automaton has 2005 states and 3824 transitions. Word has length 68 [2021-11-19 14:39:49,415 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 14:39:49,415 INFO L470 AbstractCegarLoop]: Abstraction has 2005 states and 3824 transitions. [2021-11-19 14:39:49,416 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 14.25) internal successors, (57), 4 states have internal predecessors, (57), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-19 14:39:49,416 INFO L276 IsEmpty]: Start isEmpty. Operand 2005 states and 3824 transitions. [2021-11-19 14:39:49,429 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2021-11-19 14:39:49,430 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 14:39:49,430 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 14:39:49,431 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-19 14:39:49,431 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 14:39:49,435 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 14:39:49,436 INFO L85 PathProgramCache]: Analyzing trace with hash 73452699, now seen corresponding path program 1 times [2021-11-19 14:39:49,436 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 14:39:49,436 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [701606228] [2021-11-19 14:39:49,437 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 14:39:49,437 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 14:39:49,523 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:39:49,717 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-19 14:39:49,717 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 14:39:49,718 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [701606228] [2021-11-19 14:39:49,718 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [701606228] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 14:39:49,718 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1666903994] [2021-11-19 14:39:49,719 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 14:39:49,719 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 14:39:49,720 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c3b0249c-1470-41ec-89e7-b7780898d496/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 14:39:49,722 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c3b0249c-1470-41ec-89e7-b7780898d496/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 14:39:49,752 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c3b0249c-1470-41ec-89e7-b7780898d496/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-19 14:39:50,060 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:39:50,068 INFO L263 TraceCheckSpWp]: Trace formula consists of 1057 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-19 14:39:50,090 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 14:39:50,551 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 29 proven. 0 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-19 14:39:50,551 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 14:39:51,113 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2021-11-19 14:39:51,114 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1666903994] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-19 14:39:51,114 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-19 14:39:51,114 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5, 4] total 7 [2021-11-19 14:39:51,116 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1361954286] [2021-11-19 14:39:51,116 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 14:39:51,117 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-19 14:39:51,118 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 14:39:51,118 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-19 14:39:51,119 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-19 14:39:51,119 INFO L87 Difference]: Start difference. First operand 2005 states and 3824 transitions. Second operand has 3 states, 3 states have (on average 34.333333333333336) internal successors, (103), 2 states have internal predecessors, (103), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-19 14:39:51,788 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 14:39:51,788 INFO L93 Difference]: Finished difference Result 2716 states and 4939 transitions. [2021-11-19 14:39:51,789 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-19 14:39:51,789 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 34.333333333333336) internal successors, (103), 2 states have internal predecessors, (103), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 137 [2021-11-19 14:39:51,790 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 14:39:51,813 INFO L225 Difference]: With dead ends: 2716 [2021-11-19 14:39:51,814 INFO L226 Difference]: Without dead ends: 2357 [2021-11-19 14:39:51,817 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 277 GetRequests, 271 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-19 14:39:51,819 INFO L933 BasicCegarLoop]: 3359 mSDtfsCounter, 3515 mSDsluCounter, 276 mSDsCounter, 0 mSdLazyCounter, 316 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3515 SdHoareTripleChecker+Valid, 3592 SdHoareTripleChecker+Invalid, 318 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 316 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-19 14:39:51,820 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3515 Valid, 3592 Invalid, 318 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 316 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-19 14:39:51,827 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2357 states. [2021-11-19 14:39:51,931 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2357 to 2351. [2021-11-19 14:39:51,939 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2351 states, 2233 states have (on average 1.8669950738916257) internal successors, (4169), 2238 states have internal predecessors, (4169), 92 states have call successors, (92), 25 states have call predecessors, (92), 24 states have return successors, (90), 88 states have call predecessors, (90), 90 states have call successors, (90) [2021-11-19 14:39:51,963 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2351 states to 2351 states and 4351 transitions. [2021-11-19 14:39:51,963 INFO L78 Accepts]: Start accepts. Automaton has 2351 states and 4351 transitions. Word has length 137 [2021-11-19 14:39:51,965 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 14:39:51,965 INFO L470 AbstractCegarLoop]: Abstraction has 2351 states and 4351 transitions. [2021-11-19 14:39:51,966 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 34.333333333333336) internal successors, (103), 2 states have internal predecessors, (103), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-19 14:39:51,966 INFO L276 IsEmpty]: Start isEmpty. Operand 2351 states and 4351 transitions. [2021-11-19 14:39:51,974 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2021-11-19 14:39:51,975 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 14:39:51,975 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 14:39:52,024 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c3b0249c-1470-41ec-89e7-b7780898d496/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-19 14:39:52,191 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c3b0249c-1470-41ec-89e7-b7780898d496/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 14:39:52,192 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 14:39:52,192 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 14:39:52,192 INFO L85 PathProgramCache]: Analyzing trace with hash 102338939, now seen corresponding path program 1 times [2021-11-19 14:39:52,193 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 14:39:52,193 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [658119663] [2021-11-19 14:39:52,193 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 14:39:52,194 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 14:39:52,233 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:39:52,411 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-19 14:39:52,413 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 14:39:52,413 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [658119663] [2021-11-19 14:39:52,414 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [658119663] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 14:39:52,415 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [241269834] [2021-11-19 14:39:52,416 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 14:39:52,416 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 14:39:52,417 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c3b0249c-1470-41ec-89e7-b7780898d496/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 14:39:52,418 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c3b0249c-1470-41ec-89e7-b7780898d496/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 14:39:52,431 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c3b0249c-1470-41ec-89e7-b7780898d496/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-19 14:39:52,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:39:52,711 INFO L263 TraceCheckSpWp]: Trace formula consists of 1051 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-19 14:39:52,731 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 14:39:53,102 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 17 proven. 0 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2021-11-19 14:39:53,103 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 14:39:53,527 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-19 14:39:53,528 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [241269834] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-19 14:39:53,528 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-19 14:39:53,528 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5, 4] total 7 [2021-11-19 14:39:53,529 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1610992693] [2021-11-19 14:39:53,529 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 14:39:53,532 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-19 14:39:53,532 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 14:39:53,533 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-19 14:39:53,533 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-19 14:39:53,534 INFO L87 Difference]: Start difference. First operand 2351 states and 4351 transitions. Second operand has 3 states, 3 states have (on average 30.333333333333332) internal successors, (91), 2 states have internal predecessors, (91), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-19 14:39:54,271 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 14:39:54,272 INFO L93 Difference]: Finished difference Result 3748 states and 6538 transitions. [2021-11-19 14:39:54,272 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-19 14:39:54,273 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 30.333333333333332) internal successors, (91), 2 states have internal predecessors, (91), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 137 [2021-11-19 14:39:54,273 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 14:39:54,301 INFO L225 Difference]: With dead ends: 3748 [2021-11-19 14:39:54,301 INFO L226 Difference]: Without dead ends: 3043 [2021-11-19 14:39:54,306 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 277 GetRequests, 271 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-19 14:39:54,308 INFO L933 BasicCegarLoop]: 3358 mSDtfsCounter, 3527 mSDsluCounter, 276 mSDsCounter, 0 mSdLazyCounter, 316 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3527 SdHoareTripleChecker+Valid, 3591 SdHoareTripleChecker+Invalid, 318 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 316 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-19 14:39:54,309 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3527 Valid, 3591 Invalid, 318 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 316 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-19 14:39:54,316 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3043 states. [2021-11-19 14:39:54,449 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3043 to 3035. [2021-11-19 14:39:54,458 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3035 states, 2811 states have (on average 1.7940234791889007) internal successors, (5043), 2818 states have internal predecessors, (5043), 174 states have call successors, (174), 49 states have call predecessors, (174), 48 states have return successors, (172), 168 states have call predecessors, (172), 172 states have call successors, (172) [2021-11-19 14:39:54,485 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3035 states to 3035 states and 5389 transitions. [2021-11-19 14:39:54,486 INFO L78 Accepts]: Start accepts. Automaton has 3035 states and 5389 transitions. Word has length 137 [2021-11-19 14:39:54,486 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 14:39:54,486 INFO L470 AbstractCegarLoop]: Abstraction has 3035 states and 5389 transitions. [2021-11-19 14:39:54,487 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 30.333333333333332) internal successors, (91), 2 states have internal predecessors, (91), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-19 14:39:54,487 INFO L276 IsEmpty]: Start isEmpty. Operand 3035 states and 5389 transitions. [2021-11-19 14:39:54,495 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2021-11-19 14:39:54,495 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 14:39:54,496 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 14:39:54,547 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c3b0249c-1470-41ec-89e7-b7780898d496/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-19 14:39:54,716 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c3b0249c-1470-41ec-89e7-b7780898d496/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-11-19 14:39:54,717 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 14:39:54,717 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 14:39:54,718 INFO L85 PathProgramCache]: Analyzing trace with hash 930219611, now seen corresponding path program 1 times [2021-11-19 14:39:54,718 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 14:39:54,718 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2044962295] [2021-11-19 14:39:54,718 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 14:39:54,718 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 14:39:54,774 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:39:54,878 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-19 14:39:54,878 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 14:39:54,879 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2044962295] [2021-11-19 14:39:54,880 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2044962295] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 14:39:54,885 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1034213632] [2021-11-19 14:39:54,886 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 14:39:54,886 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 14:39:54,886 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c3b0249c-1470-41ec-89e7-b7780898d496/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 14:39:54,892 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c3b0249c-1470-41ec-89e7-b7780898d496/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 14:39:54,911 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c3b0249c-1470-41ec-89e7-b7780898d496/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-19 14:39:55,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:39:55,184 INFO L263 TraceCheckSpWp]: Trace formula consists of 1045 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-19 14:39:55,191 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 14:39:55,475 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-11-19 14:39:55,475 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 14:39:55,825 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-11-19 14:39:55,825 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1034213632] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-19 14:39:55,825 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-19 14:39:55,826 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5, 4] total 7 [2021-11-19 14:39:55,826 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1180217043] [2021-11-19 14:39:55,826 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 14:39:55,827 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-19 14:39:55,827 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 14:39:55,828 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-19 14:39:55,828 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-19 14:39:55,829 INFO L87 Difference]: Start difference. First operand 3035 states and 5389 transitions. Second operand has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 2 states have internal predecessors, (82), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-19 14:39:56,589 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 14:39:56,589 INFO L93 Difference]: Finished difference Result 5788 states and 9686 transitions. [2021-11-19 14:39:56,590 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-19 14:39:56,590 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 2 states have internal predecessors, (82), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 137 [2021-11-19 14:39:56,591 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 14:39:56,628 INFO L225 Difference]: With dead ends: 5788 [2021-11-19 14:39:56,628 INFO L226 Difference]: Without dead ends: 4399 [2021-11-19 14:39:56,639 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 277 GetRequests, 271 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-19 14:39:56,640 INFO L933 BasicCegarLoop]: 3357 mSDtfsCounter, 3536 mSDsluCounter, 276 mSDsCounter, 0 mSdLazyCounter, 316 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3536 SdHoareTripleChecker+Valid, 3590 SdHoareTripleChecker+Invalid, 318 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 316 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-19 14:39:56,641 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3536 Valid, 3590 Invalid, 318 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 316 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-19 14:39:56,650 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4399 states. [2021-11-19 14:39:56,847 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4399 to 4387. [2021-11-19 14:39:56,860 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4387 states, 3955 states have (on average 1.710998735777497) internal successors, (6767), 3966 states have internal predecessors, (6767), 334 states have call successors, (334), 97 states have call predecessors, (334), 96 states have return successors, (332), 324 states have call predecessors, (332), 332 states have call successors, (332) [2021-11-19 14:39:56,901 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4387 states to 4387 states and 7433 transitions. [2021-11-19 14:39:56,903 INFO L78 Accepts]: Start accepts. Automaton has 4387 states and 7433 transitions. Word has length 137 [2021-11-19 14:39:56,904 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 14:39:56,904 INFO L470 AbstractCegarLoop]: Abstraction has 4387 states and 7433 transitions. [2021-11-19 14:39:56,904 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 2 states have internal predecessors, (82), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-19 14:39:56,905 INFO L276 IsEmpty]: Start isEmpty. Operand 4387 states and 7433 transitions. [2021-11-19 14:39:56,919 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2021-11-19 14:39:56,920 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 14:39:56,920 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 14:39:56,969 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c3b0249c-1470-41ec-89e7-b7780898d496/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-19 14:39:57,139 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c3b0249c-1470-41ec-89e7-b7780898d496/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 14:39:57,140 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 14:39:57,140 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 14:39:57,140 INFO L85 PathProgramCache]: Analyzing trace with hash 278859131, now seen corresponding path program 1 times [2021-11-19 14:39:57,140 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 14:39:57,141 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [298248678] [2021-11-19 14:39:57,141 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 14:39:57,141 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 14:39:57,183 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:39:57,296 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-19 14:39:57,296 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 14:39:57,296 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [298248678] [2021-11-19 14:39:57,297 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [298248678] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 14:39:57,297 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [346048372] [2021-11-19 14:39:57,297 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 14:39:57,297 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 14:39:57,298 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c3b0249c-1470-41ec-89e7-b7780898d496/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 14:39:57,299 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c3b0249c-1470-41ec-89e7-b7780898d496/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 14:39:57,320 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c3b0249c-1470-41ec-89e7-b7780898d496/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-19 14:39:57,590 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:39:57,596 INFO L263 TraceCheckSpWp]: Trace formula consists of 1039 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-19 14:39:57,602 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 14:39:58,027 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2021-11-19 14:39:58,028 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 14:39:58,333 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-19 14:39:58,334 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [346048372] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-19 14:39:58,334 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-19 14:39:58,334 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5, 4] total 7 [2021-11-19 14:39:58,335 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1054620957] [2021-11-19 14:39:58,335 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 14:39:58,336 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-19 14:39:58,336 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 14:39:58,336 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-19 14:39:58,337 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-19 14:39:58,337 INFO L87 Difference]: Start difference. First operand 4387 states and 7433 transitions. Second operand has 3 states, 3 states have (on average 28.333333333333332) internal successors, (85), 2 states have internal predecessors, (85), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-19 14:39:59,172 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 14:39:59,172 INFO L93 Difference]: Finished difference Result 9820 states and 15882 transitions. [2021-11-19 14:39:59,173 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-19 14:39:59,174 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 28.333333333333332) internal successors, (85), 2 states have internal predecessors, (85), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 137 [2021-11-19 14:39:59,174 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 14:39:59,243 INFO L225 Difference]: With dead ends: 9820 [2021-11-19 14:39:59,243 INFO L226 Difference]: Without dead ends: 7079 [2021-11-19 14:39:59,262 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 277 GetRequests, 271 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-19 14:39:59,264 INFO L933 BasicCegarLoop]: 3318 mSDtfsCounter, 3533 mSDsluCounter, 276 mSDsCounter, 0 mSdLazyCounter, 313 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3533 SdHoareTripleChecker+Valid, 3551 SdHoareTripleChecker+Invalid, 315 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 313 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-19 14:39:59,264 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3533 Valid, 3551 Invalid, 315 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 313 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-19 14:39:59,279 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7079 states. [2021-11-19 14:39:59,589 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7079 to 7059. [2021-11-19 14:39:59,621 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7059 states, 6219 states have (on average 1.6348287506029908) internal successors, (10167), 6238 states have internal predecessors, (10167), 646 states have call successors, (646), 193 states have call predecessors, (646), 192 states have return successors, (644), 628 states have call predecessors, (644), 644 states have call successors, (644) [2021-11-19 14:39:59,667 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7059 states to 7059 states and 11457 transitions. [2021-11-19 14:39:59,668 INFO L78 Accepts]: Start accepts. Automaton has 7059 states and 11457 transitions. Word has length 137 [2021-11-19 14:39:59,669 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 14:39:59,669 INFO L470 AbstractCegarLoop]: Abstraction has 7059 states and 11457 transitions. [2021-11-19 14:39:59,671 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 28.333333333333332) internal successors, (85), 2 states have internal predecessors, (85), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-19 14:39:59,671 INFO L276 IsEmpty]: Start isEmpty. Operand 7059 states and 11457 transitions. [2021-11-19 14:39:59,692 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2021-11-19 14:39:59,692 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 14:39:59,693 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 14:39:59,742 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c3b0249c-1470-41ec-89e7-b7780898d496/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-19 14:39:59,907 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c3b0249c-1470-41ec-89e7-b7780898d496/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 14:39:59,908 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 14:39:59,908 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 14:39:59,908 INFO L85 PathProgramCache]: Analyzing trace with hash 2084854363, now seen corresponding path program 1 times [2021-11-19 14:39:59,908 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 14:39:59,908 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1949124696] [2021-11-19 14:39:59,908 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 14:39:59,909 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 14:39:59,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:40:00,065 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-19 14:40:00,066 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 14:40:00,066 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1949124696] [2021-11-19 14:40:00,066 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1949124696] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 14:40:00,066 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [737749905] [2021-11-19 14:40:00,067 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 14:40:00,067 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 14:40:00,067 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c3b0249c-1470-41ec-89e7-b7780898d496/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 14:40:00,068 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c3b0249c-1470-41ec-89e7-b7780898d496/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 14:40:00,091 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c3b0249c-1470-41ec-89e7-b7780898d496/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-19 14:40:00,356 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:40:00,362 INFO L263 TraceCheckSpWp]: Trace formula consists of 1033 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-19 14:40:00,367 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 14:40:00,668 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 38 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-19 14:40:00,669 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 14:40:01,005 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2021-11-19 14:40:01,005 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [737749905] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-19 14:40:01,005 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-19 14:40:01,006 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5, 4] total 7 [2021-11-19 14:40:01,006 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [617076258] [2021-11-19 14:40:01,006 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 14:40:01,007 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-19 14:40:01,007 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 14:40:01,008 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-19 14:40:01,008 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-19 14:40:01,008 INFO L87 Difference]: Start difference. First operand 7059 states and 11457 transitions. Second operand has 3 states, 3 states have (on average 37.333333333333336) internal successors, (112), 2 states have internal predecessors, (112), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-19 14:40:01,993 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 14:40:01,993 INFO L93 Difference]: Finished difference Result 17788 states and 28074 transitions. [2021-11-19 14:40:01,994 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-19 14:40:01,994 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 37.333333333333336) internal successors, (112), 2 states have internal predecessors, (112), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 137 [2021-11-19 14:40:02,001 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 14:40:02,121 INFO L225 Difference]: With dead ends: 17788 [2021-11-19 14:40:02,121 INFO L226 Difference]: Without dead ends: 12375 [2021-11-19 14:40:02,154 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 277 GetRequests, 271 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-19 14:40:02,157 INFO L933 BasicCegarLoop]: 3318 mSDtfsCounter, 3506 mSDsluCounter, 276 mSDsCounter, 0 mSdLazyCounter, 313 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3506 SdHoareTripleChecker+Valid, 3551 SdHoareTripleChecker+Invalid, 315 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 313 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-19 14:40:02,158 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3506 Valid, 3551 Invalid, 315 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 313 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-19 14:40:02,180 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12375 states. [2021-11-19 14:40:02,814 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12375 to 12339. [2021-11-19 14:40:02,842 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12339 states, 10699 states have (on average 1.5768763435835125) internal successors, (16871), 10734 states have internal predecessors, (16871), 1254 states have call successors, (1254), 385 states have call predecessors, (1254), 384 states have return successors, (1252), 1220 states have call predecessors, (1252), 1252 states have call successors, (1252) [2021-11-19 14:40:02,916 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12339 states to 12339 states and 19377 transitions. [2021-11-19 14:40:02,918 INFO L78 Accepts]: Start accepts. Automaton has 12339 states and 19377 transitions. Word has length 137 [2021-11-19 14:40:02,919 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 14:40:02,919 INFO L470 AbstractCegarLoop]: Abstraction has 12339 states and 19377 transitions. [2021-11-19 14:40:02,920 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 37.333333333333336) internal successors, (112), 2 states have internal predecessors, (112), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-19 14:40:02,920 INFO L276 IsEmpty]: Start isEmpty. Operand 12339 states and 19377 transitions. [2021-11-19 14:40:02,957 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2021-11-19 14:40:02,961 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 14:40:02,961 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 14:40:03,009 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c3b0249c-1470-41ec-89e7-b7780898d496/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-19 14:40:03,175 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c3b0249c-1470-41ec-89e7-b7780898d496/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 14:40:03,176 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 14:40:03,176 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 14:40:03,176 INFO L85 PathProgramCache]: Analyzing trace with hash 470849915, now seen corresponding path program 1 times [2021-11-19 14:40:03,177 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 14:40:03,177 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [488722001] [2021-11-19 14:40:03,177 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 14:40:03,177 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 14:40:03,235 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:40:03,310 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-19 14:40:03,310 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 14:40:03,310 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [488722001] [2021-11-19 14:40:03,311 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [488722001] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 14:40:03,311 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1600922542] [2021-11-19 14:40:03,311 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 14:40:03,312 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 14:40:03,312 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c3b0249c-1470-41ec-89e7-b7780898d496/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 14:40:03,313 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c3b0249c-1470-41ec-89e7-b7780898d496/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 14:40:03,337 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c3b0249c-1470-41ec-89e7-b7780898d496/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-19 14:40:03,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:40:03,606 INFO L263 TraceCheckSpWp]: Trace formula consists of 1027 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-19 14:40:03,612 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 14:40:03,989 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 35 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-19 14:40:03,990 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 14:40:04,355 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2021-11-19 14:40:04,356 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1600922542] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-19 14:40:04,356 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-19 14:40:04,356 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5, 4] total 7 [2021-11-19 14:40:04,357 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1696432895] [2021-11-19 14:40:04,358 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 14:40:04,358 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-19 14:40:04,359 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 14:40:04,359 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-19 14:40:04,359 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-19 14:40:04,360 INFO L87 Difference]: Start difference. First operand 12339 states and 19377 transitions. Second operand has 3 states, 3 states have (on average 36.333333333333336) internal successors, (109), 2 states have internal predecessors, (109), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-19 14:40:05,797 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 14:40:05,802 INFO L93 Difference]: Finished difference Result 33532 states and 52058 transitions. [2021-11-19 14:40:05,803 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-19 14:40:05,803 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 36.333333333333336) internal successors, (109), 2 states have internal predecessors, (109), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 137 [2021-11-19 14:40:05,804 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 14:40:05,936 INFO L225 Difference]: With dead ends: 33532 [2021-11-19 14:40:05,936 INFO L226 Difference]: Without dead ends: 22839 [2021-11-19 14:40:06,002 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 277 GetRequests, 271 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-19 14:40:06,003 INFO L933 BasicCegarLoop]: 3318 mSDtfsCounter, 3509 mSDsluCounter, 276 mSDsCounter, 0 mSdLazyCounter, 313 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3509 SdHoareTripleChecker+Valid, 3551 SdHoareTripleChecker+Invalid, 315 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 313 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-19 14:40:06,006 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3509 Valid, 3551 Invalid, 315 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 313 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-19 14:40:06,047 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22839 states. [2021-11-19 14:40:06,956 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22839 to 22771. [2021-11-19 14:40:07,330 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22771 states, 19563 states have (on average 1.537954301487502) internal successors, (30087), 19630 states have internal predecessors, (30087), 2438 states have call successors, (2438), 769 states have call predecessors, (2438), 768 states have return successors, (2436), 2372 states have call predecessors, (2436), 2436 states have call successors, (2436) [2021-11-19 14:40:07,425 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22771 states to 22771 states and 34961 transitions. [2021-11-19 14:40:07,428 INFO L78 Accepts]: Start accepts. Automaton has 22771 states and 34961 transitions. Word has length 137 [2021-11-19 14:40:07,429 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 14:40:07,429 INFO L470 AbstractCegarLoop]: Abstraction has 22771 states and 34961 transitions. [2021-11-19 14:40:07,430 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 36.333333333333336) internal successors, (109), 2 states have internal predecessors, (109), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-19 14:40:07,430 INFO L276 IsEmpty]: Start isEmpty. Operand 22771 states and 34961 transitions. [2021-11-19 14:40:07,486 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2021-11-19 14:40:07,486 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 14:40:07,486 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 14:40:07,535 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c3b0249c-1470-41ec-89e7-b7780898d496/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-19 14:40:07,699 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c3b0249c-1470-41ec-89e7-b7780898d496/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-11-19 14:40:07,700 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 14:40:07,700 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 14:40:07,701 INFO L85 PathProgramCache]: Analyzing trace with hash -176781733, now seen corresponding path program 1 times [2021-11-19 14:40:07,701 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 14:40:07,701 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [68606118] [2021-11-19 14:40:07,701 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 14:40:07,701 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 14:40:07,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:40:07,840 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-19 14:40:07,841 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 14:40:07,841 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [68606118] [2021-11-19 14:40:07,841 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [68606118] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 14:40:07,841 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [587471503] [2021-11-19 14:40:07,842 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 14:40:07,842 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 14:40:07,842 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c3b0249c-1470-41ec-89e7-b7780898d496/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 14:40:07,844 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c3b0249c-1470-41ec-89e7-b7780898d496/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 14:40:07,875 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c3b0249c-1470-41ec-89e7-b7780898d496/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-19 14:40:08,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:40:08,142 INFO L263 TraceCheckSpWp]: Trace formula consists of 1021 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-19 14:40:08,147 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 14:40:08,498 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 23 proven. 0 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2021-11-19 14:40:08,498 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 14:40:08,858 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-19 14:40:08,859 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [587471503] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-19 14:40:08,859 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-19 14:40:08,859 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5, 4] total 7 [2021-11-19 14:40:08,860 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [29460392] [2021-11-19 14:40:08,860 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 14:40:08,861 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-19 14:40:08,861 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 14:40:08,861 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-19 14:40:08,861 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-19 14:40:08,862 INFO L87 Difference]: Start difference. First operand 22771 states and 34961 transitions. Second operand has 3 states, 3 states have (on average 32.333333333333336) internal successors, (97), 2 states have internal predecessors, (97), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-19 14:40:10,926 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 14:40:10,926 INFO L93 Difference]: Finished difference Result 64636 states and 99226 transitions. [2021-11-19 14:40:10,926 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-19 14:40:10,927 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 32.333333333333336) internal successors, (97), 2 states have internal predecessors, (97), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 137 [2021-11-19 14:40:10,927 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 14:40:11,184 INFO L225 Difference]: With dead ends: 64636 [2021-11-19 14:40:11,185 INFO L226 Difference]: Without dead ends: 43511 [2021-11-19 14:40:11,289 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 277 GetRequests, 271 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-19 14:40:11,290 INFO L933 BasicCegarLoop]: 3318 mSDtfsCounter, 3521 mSDsluCounter, 276 mSDsCounter, 0 mSdLazyCounter, 313 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3521 SdHoareTripleChecker+Valid, 3551 SdHoareTripleChecker+Invalid, 315 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 313 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-19 14:40:11,291 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3521 Valid, 3551 Invalid, 315 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 313 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-19 14:40:11,347 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43511 states. [2021-11-19 14:40:13,089 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43511 to 43379. [2021-11-19 14:40:13,147 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43379 states, 37099 states have (on average 1.5131135610124262) internal successors, (56135), 37230 states have internal predecessors, (56135), 4742 states have call successors, (4742), 1537 states have call predecessors, (4742), 1536 states have return successors, (4740), 4612 states have call predecessors, (4740), 4740 states have call successors, (4740) [2021-11-19 14:40:13,612 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43379 states to 43379 states and 65617 transitions. [2021-11-19 14:40:13,631 INFO L78 Accepts]: Start accepts. Automaton has 43379 states and 65617 transitions. Word has length 137 [2021-11-19 14:40:13,645 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 14:40:13,646 INFO L470 AbstractCegarLoop]: Abstraction has 43379 states and 65617 transitions. [2021-11-19 14:40:13,646 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 32.333333333333336) internal successors, (97), 2 states have internal predecessors, (97), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-19 14:40:13,646 INFO L276 IsEmpty]: Start isEmpty. Operand 43379 states and 65617 transitions. [2021-11-19 14:40:13,770 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2021-11-19 14:40:13,771 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 14:40:13,771 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 14:40:13,820 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c3b0249c-1470-41ec-89e7-b7780898d496/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-19 14:40:13,995 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c3b0249c-1470-41ec-89e7-b7780898d496/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2021-11-19 14:40:13,996 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 14:40:13,996 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 14:40:13,996 INFO L85 PathProgramCache]: Analyzing trace with hash 1543512891, now seen corresponding path program 1 times [2021-11-19 14:40:13,996 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 14:40:13,997 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1504389725] [2021-11-19 14:40:13,997 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 14:40:13,997 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 14:40:14,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:40:14,170 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2021-11-19 14:40:14,171 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 14:40:14,171 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1504389725] [2021-11-19 14:40:14,171 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1504389725] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 14:40:14,171 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-19 14:40:14,172 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-19 14:40:14,172 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1497902276] [2021-11-19 14:40:14,172 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 14:40:14,173 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-19 14:40:14,173 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 14:40:14,174 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-19 14:40:14,174 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-19 14:40:14,174 INFO L87 Difference]: Start difference. First operand 43379 states and 65617 transitions. Second operand has 6 states, 6 states have (on average 13.166666666666666) internal successors, (79), 6 states have internal predecessors, (79), 4 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-11-19 14:40:19,160 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 14:40:19,161 INFO L93 Difference]: Finished difference Result 147579 states and 220888 transitions. [2021-11-19 14:40:19,161 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-19 14:40:19,162 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 13.166666666666666) internal successors, (79), 6 states have internal predecessors, (79), 4 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) Word has length 137 [2021-11-19 14:40:19,163 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 14:40:20,137 INFO L225 Difference]: With dead ends: 147579 [2021-11-19 14:40:20,137 INFO L226 Difference]: Without dead ends: 105847 [2021-11-19 14:40:20,267 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2021-11-19 14:40:20,270 INFO L933 BasicCegarLoop]: 3321 mSDtfsCounter, 4416 mSDsluCounter, 7096 mSDsCounter, 0 mSdLazyCounter, 931 mSolverCounterSat, 158 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4437 SdHoareTripleChecker+Valid, 9902 SdHoareTripleChecker+Invalid, 1089 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 158 IncrementalHoareTripleChecker+Valid, 931 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2021-11-19 14:40:20,271 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4437 Valid, 9902 Invalid, 1089 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [158 Valid, 931 Invalid, 0 Unknown, 0 Unchecked, 1.3s Time] [2021-11-19 14:40:20,385 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105847 states. [2021-11-19 14:40:24,906 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105847 to 83571. [2021-11-19 14:40:25,012 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83571 states, 71275 states have (on average 1.4969484391441599) internal successors, (106695), 71534 states have internal predecessors, (106695), 9222 states have call successors, (9222), 3073 states have call predecessors, (9222), 3072 states have return successors, (9220), 8964 states have call predecessors, (9220), 9220 states have call successors, (9220) [2021-11-19 14:40:25,894 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83571 states to 83571 states and 125137 transitions. [2021-11-19 14:40:25,908 INFO L78 Accepts]: Start accepts. Automaton has 83571 states and 125137 transitions. Word has length 137 [2021-11-19 14:40:25,911 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 14:40:25,911 INFO L470 AbstractCegarLoop]: Abstraction has 83571 states and 125137 transitions. [2021-11-19 14:40:25,911 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 13.166666666666666) internal successors, (79), 6 states have internal predecessors, (79), 4 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-11-19 14:40:25,911 INFO L276 IsEmpty]: Start isEmpty. Operand 83571 states and 125137 transitions. [2021-11-19 14:40:26,037 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 160 [2021-11-19 14:40:26,038 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 14:40:26,038 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 14:40:26,039 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-11-19 14:40:26,039 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 14:40:26,039 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 14:40:26,040 INFO L85 PathProgramCache]: Analyzing trace with hash 1292982879, now seen corresponding path program 1 times [2021-11-19 14:40:26,040 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 14:40:26,040 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [398863564] [2021-11-19 14:40:26,040 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 14:40:26,041 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 14:40:26,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:40:26,202 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 10 proven. 41 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-19 14:40:26,202 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 14:40:26,202 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [398863564] [2021-11-19 14:40:26,203 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [398863564] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 14:40:26,203 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1373588968] [2021-11-19 14:40:26,203 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 14:40:26,203 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 14:40:26,204 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c3b0249c-1470-41ec-89e7-b7780898d496/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 14:40:26,205 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c3b0249c-1470-41ec-89e7-b7780898d496/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 14:40:26,227 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c3b0249c-1470-41ec-89e7-b7780898d496/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-19 14:40:26,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:40:26,507 INFO L263 TraceCheckSpWp]: Trace formula consists of 1056 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-19 14:40:26,513 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 14:40:26,871 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 28 proven. 0 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2021-11-19 14:40:26,872 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 14:40:27,259 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 24 proven. 0 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2021-11-19 14:40:27,259 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1373588968] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-19 14:40:27,259 INFO L186 FreeRefinementEngine]: Found 2 perfect and 1 imperfect interpolant sequences. [2021-11-19 14:40:27,260 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [6] total 8 [2021-11-19 14:40:27,260 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2006854298] [2021-11-19 14:40:27,260 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-19 14:40:27,261 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-19 14:40:27,261 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 14:40:27,262 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-19 14:40:27,262 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2021-11-19 14:40:27,263 INFO L87 Difference]: Start difference. First operand 83571 states and 125137 transitions. Second operand has 4 states, 4 states have (on average 28.5) internal successors, (114), 4 states have internal predecessors, (114), 4 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-19 14:40:31,718 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 14:40:31,718 INFO L93 Difference]: Finished difference Result 150007 states and 227156 transitions. [2021-11-19 14:40:31,718 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-19 14:40:31,719 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 28.5) internal successors, (114), 4 states have internal predecessors, (114), 4 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 159 [2021-11-19 14:40:31,719 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 14:40:32,322 INFO L225 Difference]: With dead ends: 150007 [2021-11-19 14:40:32,323 INFO L226 Difference]: Without dead ends: 108019 [2021-11-19 14:40:32,471 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 324 GetRequests, 318 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2021-11-19 14:40:32,472 INFO L933 BasicCegarLoop]: 3432 mSDtfsCounter, 149 mSDsluCounter, 7120 mSDsCounter, 0 mSdLazyCounter, 821 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 149 SdHoareTripleChecker+Valid, 10041 SdHoareTripleChecker+Invalid, 823 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 821 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-19 14:40:32,473 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [149 Valid, 10041 Invalid, 823 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 821 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-19 14:40:32,589 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108019 states. [2021-11-19 14:40:37,590 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108019 to 99315. [2021-11-19 14:40:37,685 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99315 states, 86507 states have (on average 1.5381761013559596) internal successors, (133063), 86766 states have internal predecessors, (133063), 9478 states have call successors, (9478), 3329 states have call predecessors, (9478), 3328 states have return successors, (9476), 9220 states have call predecessors, (9476), 9476 states have call successors, (9476) [2021-11-19 14:40:38,384 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99315 states to 99315 states and 152017 transitions. [2021-11-19 14:40:38,402 INFO L78 Accepts]: Start accepts. Automaton has 99315 states and 152017 transitions. Word has length 159 [2021-11-19 14:40:38,403 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 14:40:38,403 INFO L470 AbstractCegarLoop]: Abstraction has 99315 states and 152017 transitions. [2021-11-19 14:40:38,403 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 28.5) internal successors, (114), 4 states have internal predecessors, (114), 4 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-19 14:40:38,404 INFO L276 IsEmpty]: Start isEmpty. Operand 99315 states and 152017 transitions. [2021-11-19 14:40:38,676 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 210 [2021-11-19 14:40:38,676 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 14:40:38,677 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 14:40:38,727 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c3b0249c-1470-41ec-89e7-b7780898d496/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-19 14:40:38,895 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c3b0249c-1470-41ec-89e7-b7780898d496/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 14:40:38,895 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 14:40:38,896 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 14:40:38,896 INFO L85 PathProgramCache]: Analyzing trace with hash -1994373479, now seen corresponding path program 1 times [2021-11-19 14:40:38,896 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 14:40:38,897 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [659535866] [2021-11-19 14:40:38,897 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 14:40:38,897 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 14:40:38,950 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:40:39,060 INFO L134 CoverageAnalysis]: Checked inductivity of 159 backedges. 10 proven. 81 refuted. 0 times theorem prover too weak. 68 trivial. 0 not checked. [2021-11-19 14:40:39,060 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 14:40:39,061 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [659535866] [2021-11-19 14:40:39,061 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [659535866] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 14:40:39,061 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [827628272] [2021-11-19 14:40:39,061 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 14:40:39,061 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 14:40:39,062 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c3b0249c-1470-41ec-89e7-b7780898d496/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 14:40:39,063 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c3b0249c-1470-41ec-89e7-b7780898d496/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 14:40:39,068 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c3b0249c-1470-41ec-89e7-b7780898d496/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-19 14:40:39,403 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:40:39,410 INFO L263 TraceCheckSpWp]: Trace formula consists of 1320 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-19 14:40:39,417 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 14:40:39,945 INFO L134 CoverageAnalysis]: Checked inductivity of 159 backedges. 101 proven. 0 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2021-11-19 14:40:39,945 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 14:40:40,386 INFO L134 CoverageAnalysis]: Checked inductivity of 159 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 145 trivial. 0 not checked. [2021-11-19 14:40:40,387 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [827628272] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-19 14:40:40,387 INFO L186 FreeRefinementEngine]: Found 2 perfect and 1 imperfect interpolant sequences. [2021-11-19 14:40:40,388 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 3] imperfect sequences [6] total 7 [2021-11-19 14:40:40,388 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1258836890] [2021-11-19 14:40:40,388 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-19 14:40:40,389 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-19 14:40:40,389 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 14:40:40,389 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-19 14:40:40,390 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-19 14:40:40,390 INFO L87 Difference]: Start difference. First operand 99315 states and 152017 transitions. Second operand has 3 states, 3 states have (on average 60.333333333333336) internal successors, (181), 3 states have internal predecessors, (181), 3 states have call successors, (20), 3 states have call predecessors, (20), 3 states have return successors, (19), 3 states have call predecessors, (19), 3 states have call successors, (19) [2021-11-19 14:40:47,832 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 14:40:47,832 INFO L93 Difference]: Finished difference Result 293116 states and 452570 transitions. [2021-11-19 14:40:47,833 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-19 14:40:47,833 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 60.333333333333336) internal successors, (181), 3 states have internal predecessors, (181), 3 states have call successors, (20), 3 states have call predecessors, (20), 3 states have return successors, (19), 3 states have call predecessors, (19), 3 states have call successors, (19) Word has length 209 [2021-11-19 14:40:47,834 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 14:40:48,656 INFO L225 Difference]: With dead ends: 293116 [2021-11-19 14:40:48,657 INFO L226 Difference]: Without dead ends: 195447 [2021-11-19 14:40:48,920 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 424 GetRequests, 418 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-19 14:40:48,921 INFO L933 BasicCegarLoop]: 3326 mSDtfsCounter, 3461 mSDsluCounter, 276 mSDsCounter, 0 mSdLazyCounter, 316 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3461 SdHoareTripleChecker+Valid, 3559 SdHoareTripleChecker+Invalid, 318 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 316 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-19 14:40:48,921 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3461 Valid, 3559 Invalid, 318 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 316 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-19 14:40:49,109 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 195447 states.