./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/seq-mthreaded-reduced/pals_lcr-var-start-time.3.2.ufo.UNBOUNDED.pals.c.v+cfa-reducer.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version aef121e0 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_299144f6-6ee8-4996-ad41-e9f41109532a/bin/utaipan-EQgc7hIp5V/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_299144f6-6ee8-4996-ad41-e9f41109532a/bin/utaipan-EQgc7hIp5V/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_299144f6-6ee8-4996-ad41-e9f41109532a/bin/utaipan-EQgc7hIp5V/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_299144f6-6ee8-4996-ad41-e9f41109532a/bin/utaipan-EQgc7hIp5V/config/TaipanReach.xml -i ../../sv-benchmarks/c/seq-mthreaded-reduced/pals_lcr-var-start-time.3.2.ufo.UNBOUNDED.pals.c.v+cfa-reducer.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_299144f6-6ee8-4996-ad41-e9f41109532a/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_299144f6-6ee8-4996-ad41-e9f41109532a/bin/utaipan-EQgc7hIp5V --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 0451b84ecb7a9b49daa0d007f78b5b7787a8fa890fb4c838a3b9a1c5be28a03a --- Real Ultimate output --- This is Ultimate 0.2.1-dev-aef121e [2021-11-23 02:56:12,618 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 02:56:12,621 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 02:56:12,678 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 02:56:12,679 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 02:56:12,683 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 02:56:12,685 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 02:56:12,689 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 02:56:12,692 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 02:56:12,698 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 02:56:12,699 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 02:56:12,701 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 02:56:12,701 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 02:56:12,707 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 02:56:12,709 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 02:56:12,717 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 02:56:12,719 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 02:56:12,720 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 02:56:12,723 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 02:56:12,731 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 02:56:12,733 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 02:56:12,735 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 02:56:12,738 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 02:56:12,740 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 02:56:12,749 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 02:56:12,750 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 02:56:12,750 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 02:56:12,752 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 02:56:12,753 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 02:56:12,755 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 02:56:12,755 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 02:56:12,756 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 02:56:12,759 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 02:56:12,760 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 02:56:12,762 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 02:56:12,762 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 02:56:12,763 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 02:56:12,763 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 02:56:12,764 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 02:56:12,765 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 02:56:12,766 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 02:56:12,767 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_299144f6-6ee8-4996-ad41-e9f41109532a/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-23 02:56:12,811 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 02:56:12,812 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 02:56:12,812 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 02:56:12,813 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 02:56:12,820 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 02:56:12,820 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 02:56:12,821 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 02:56:12,821 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 02:56:12,821 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 02:56:12,821 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 02:56:12,822 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 02:56:12,823 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 02:56:12,823 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 02:56:12,823 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 02:56:12,823 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 02:56:12,824 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 02:56:12,824 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 02:56:12,824 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 02:56:12,825 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 02:56:12,825 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 02:56:12,825 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 02:56:12,826 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 02:56:12,826 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 02:56:12,826 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 02:56:12,826 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 02:56:12,827 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 02:56:12,828 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 02:56:12,829 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 02:56:12,829 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 02:56:12,829 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 02:56:12,829 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 02:56:12,830 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 02:56:12,830 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 02:56:12,830 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 02:56:12,830 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 02:56:12,831 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 02:56:12,831 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 02:56:12,831 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 02:56:12,831 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 02:56:12,832 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 02:56:12,832 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 02:56:12,832 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_299144f6-6ee8-4996-ad41-e9f41109532a/bin/utaipan-EQgc7hIp5V/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_299144f6-6ee8-4996-ad41-e9f41109532a/bin/utaipan-EQgc7hIp5V Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 0451b84ecb7a9b49daa0d007f78b5b7787a8fa890fb4c838a3b9a1c5be28a03a [2021-11-23 02:56:13,123 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 02:56:13,147 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 02:56:13,151 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 02:56:13,153 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 02:56:13,153 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 02:56:13,155 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_299144f6-6ee8-4996-ad41-e9f41109532a/bin/utaipan-EQgc7hIp5V/../../sv-benchmarks/c/seq-mthreaded-reduced/pals_lcr-var-start-time.3.2.ufo.UNBOUNDED.pals.c.v+cfa-reducer.c [2021-11-23 02:56:13,233 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_299144f6-6ee8-4996-ad41-e9f41109532a/bin/utaipan-EQgc7hIp5V/data/2fe93f85e/22c81b3c134d4bce8dedbdd65c2f534b/FLAGf070622bc [2021-11-23 02:56:13,738 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 02:56:13,740 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_299144f6-6ee8-4996-ad41-e9f41109532a/sv-benchmarks/c/seq-mthreaded-reduced/pals_lcr-var-start-time.3.2.ufo.UNBOUNDED.pals.c.v+cfa-reducer.c [2021-11-23 02:56:13,753 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_299144f6-6ee8-4996-ad41-e9f41109532a/bin/utaipan-EQgc7hIp5V/data/2fe93f85e/22c81b3c134d4bce8dedbdd65c2f534b/FLAGf070622bc [2021-11-23 02:56:14,064 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_299144f6-6ee8-4996-ad41-e9f41109532a/bin/utaipan-EQgc7hIp5V/data/2fe93f85e/22c81b3c134d4bce8dedbdd65c2f534b [2021-11-23 02:56:14,067 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 02:56:14,068 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 02:56:14,070 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 02:56:14,071 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 02:56:14,082 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 02:56:14,083 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:56:14" (1/1) ... [2021-11-23 02:56:14,085 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@312fb024 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:56:14, skipping insertion in model container [2021-11-23 02:56:14,085 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:56:14" (1/1) ... [2021-11-23 02:56:14,095 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 02:56:14,130 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 02:56:14,368 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_299144f6-6ee8-4996-ad41-e9f41109532a/sv-benchmarks/c/seq-mthreaded-reduced/pals_lcr-var-start-time.3.2.ufo.UNBOUNDED.pals.c.v+cfa-reducer.c[4411,4424] [2021-11-23 02:56:14,389 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 02:56:14,402 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 02:56:14,434 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_299144f6-6ee8-4996-ad41-e9f41109532a/sv-benchmarks/c/seq-mthreaded-reduced/pals_lcr-var-start-time.3.2.ufo.UNBOUNDED.pals.c.v+cfa-reducer.c[4411,4424] [2021-11-23 02:56:14,448 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 02:56:14,466 INFO L208 MainTranslator]: Completed translation [2021-11-23 02:56:14,466 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:56:14 WrapperNode [2021-11-23 02:56:14,467 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 02:56:14,468 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 02:56:14,468 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 02:56:14,468 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 02:56:14,476 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:56:14" (1/1) ... [2021-11-23 02:56:14,487 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:56:14" (1/1) ... [2021-11-23 02:56:14,519 INFO L137 Inliner]: procedures = 23, calls = 7, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 316 [2021-11-23 02:56:14,519 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 02:56:14,520 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 02:56:14,520 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 02:56:14,521 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 02:56:14,529 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:56:14" (1/1) ... [2021-11-23 02:56:14,530 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:56:14" (1/1) ... [2021-11-23 02:56:14,534 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:56:14" (1/1) ... [2021-11-23 02:56:14,534 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:56:14" (1/1) ... [2021-11-23 02:56:14,541 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:56:14" (1/1) ... [2021-11-23 02:56:14,547 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:56:14" (1/1) ... [2021-11-23 02:56:14,549 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:56:14" (1/1) ... [2021-11-23 02:56:14,553 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 02:56:14,555 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 02:56:14,555 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 02:56:14,555 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 02:56:14,556 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:56:14" (1/1) ... [2021-11-23 02:56:14,565 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 02:56:14,578 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_299144f6-6ee8-4996-ad41-e9f41109532a/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:56:14,589 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_299144f6-6ee8-4996-ad41-e9f41109532a/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 02:56:14,593 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_299144f6-6ee8-4996-ad41-e9f41109532a/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 02:56:14,628 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 02:56:14,628 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 02:56:14,628 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 02:56:14,628 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 02:56:14,720 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 02:56:14,722 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 02:56:15,177 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 02:56:15,278 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 02:56:15,278 INFO L301 CfgBuilder]: Removed 0 assume(true) statements. [2021-11-23 02:56:15,281 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:56:15 BoogieIcfgContainer [2021-11-23 02:56:15,281 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 02:56:15,283 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 02:56:15,283 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 02:56:15,288 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 02:56:15,288 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 02:56:14" (1/3) ... [2021-11-23 02:56:15,289 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@606d889d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:56:15, skipping insertion in model container [2021-11-23 02:56:15,289 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:56:14" (2/3) ... [2021-11-23 02:56:15,290 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@606d889d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:56:15, skipping insertion in model container [2021-11-23 02:56:15,290 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:56:15" (3/3) ... [2021-11-23 02:56:15,292 INFO L111 eAbstractionObserver]: Analyzing ICFG pals_lcr-var-start-time.3.2.ufo.UNBOUNDED.pals.c.v+cfa-reducer.c [2021-11-23 02:56:15,297 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 02:56:15,298 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-23 02:56:15,365 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 02:56:15,370 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 [2021-11-23 02:56:15,371 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-23 02:56:15,396 INFO L276 IsEmpty]: Start isEmpty. Operand has 59 states, 57 states have (on average 1.6666666666666667) internal successors, (95), 58 states have internal predecessors, (95), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:56:15,409 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-11-23 02:56:15,409 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:56:15,410 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] [2021-11-23 02:56:15,410 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:56:15,416 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:56:15,416 INFO L85 PathProgramCache]: Analyzing trace with hash 1763601530, now seen corresponding path program 1 times [2021-11-23 02:56:15,426 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:56:15,426 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1250267098] [2021-11-23 02:56:15,426 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:56:15,427 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:56:15,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:56:15,677 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:56:15,677 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:56:15,678 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1250267098] [2021-11-23 02:56:15,678 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1250267098] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:56:15,679 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:56:15,679 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:56:15,681 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1475920917] [2021-11-23 02:56:15,682 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:56:15,686 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:56:15,686 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:56:15,726 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:56:15,727 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:56:15,730 INFO L87 Difference]: Start difference. First operand has 59 states, 57 states have (on average 1.6666666666666667) internal successors, (95), 58 states have internal predecessors, (95), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 9.333333333333334) internal successors, (28), 3 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:56:15,844 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:56:15,844 INFO L93 Difference]: Finished difference Result 133 states and 202 transitions. [2021-11-23 02:56:15,847 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:56:15,849 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 9.333333333333334) internal successors, (28), 3 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 28 [2021-11-23 02:56:15,850 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:56:15,860 INFO L225 Difference]: With dead ends: 133 [2021-11-23 02:56:15,861 INFO L226 Difference]: Without dead ends: 89 [2021-11-23 02:56:15,864 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:56:15,870 INFO L933 BasicCegarLoop]: 128 mSDtfsCounter, 66 mSDsluCounter, 56 mSDsCounter, 0 mSdLazyCounter, 18 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 66 SdHoareTripleChecker+Valid, 180 SdHoareTripleChecker+Invalid, 20 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 18 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:56:15,872 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [66 Valid, 180 Invalid, 20 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 18 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 02:56:15,890 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2021-11-23 02:56:15,933 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 87. [2021-11-23 02:56:15,935 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87 states, 86 states have (on average 1.3953488372093024) internal successors, (120), 86 states have internal predecessors, (120), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:56:15,942 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 120 transitions. [2021-11-23 02:56:15,945 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 120 transitions. Word has length 28 [2021-11-23 02:56:15,945 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:56:15,946 INFO L470 AbstractCegarLoop]: Abstraction has 87 states and 120 transitions. [2021-11-23 02:56:15,946 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 9.333333333333334) internal successors, (28), 3 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:56:15,948 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 120 transitions. [2021-11-23 02:56:15,949 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-11-23 02:56:15,949 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:56:15,950 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] [2021-11-23 02:56:15,950 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-23 02:56:15,951 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:56:15,954 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:56:15,954 INFO L85 PathProgramCache]: Analyzing trace with hash -943677467, now seen corresponding path program 1 times [2021-11-23 02:56:15,955 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:56:15,955 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1990837742] [2021-11-23 02:56:15,955 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:56:15,955 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:56:16,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:56:16,086 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:56:16,087 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:56:16,087 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1990837742] [2021-11-23 02:56:16,087 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1990837742] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:56:16,088 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:56:16,088 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:56:16,088 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [302906422] [2021-11-23 02:56:16,088 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:56:16,090 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:56:16,090 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:56:16,090 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:56:16,091 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:56:16,091 INFO L87 Difference]: Start difference. First operand 87 states and 120 transitions. Second operand has 3 states, 3 states have (on average 10.0) internal successors, (30), 3 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:56:16,140 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:56:16,140 INFO L93 Difference]: Finished difference Result 201 states and 288 transitions. [2021-11-23 02:56:16,141 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:56:16,141 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 10.0) internal successors, (30), 3 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 30 [2021-11-23 02:56:16,141 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:56:16,143 INFO L225 Difference]: With dead ends: 201 [2021-11-23 02:56:16,143 INFO L226 Difference]: Without dead ends: 133 [2021-11-23 02:56:16,144 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:56:16,146 INFO L933 BasicCegarLoop]: 91 mSDtfsCounter, 49 mSDsluCounter, 46 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 49 SdHoareTripleChecker+Valid, 134 SdHoareTripleChecker+Invalid, 16 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 14 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:56:16,147 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [49 Valid, 134 Invalid, 16 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 14 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 02:56:16,148 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2021-11-23 02:56:16,169 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 131. [2021-11-23 02:56:16,173 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 131 states, 130 states have (on average 1.4153846153846155) internal successors, (184), 130 states have internal predecessors, (184), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:56:16,178 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 184 transitions. [2021-11-23 02:56:16,179 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 184 transitions. Word has length 30 [2021-11-23 02:56:16,182 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:56:16,183 INFO L470 AbstractCegarLoop]: Abstraction has 131 states and 184 transitions. [2021-11-23 02:56:16,183 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 10.0) internal successors, (30), 3 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:56:16,183 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 184 transitions. [2021-11-23 02:56:16,185 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-11-23 02:56:16,189 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:56:16,189 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] [2021-11-23 02:56:16,190 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-23 02:56:16,190 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:56:16,194 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:56:16,194 INFO L85 PathProgramCache]: Analyzing trace with hash 233057630, now seen corresponding path program 1 times [2021-11-23 02:56:16,194 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:56:16,194 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [492501037] [2021-11-23 02:56:16,195 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:56:16,195 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:56:16,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:56:16,277 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:56:16,277 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:56:16,277 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [492501037] [2021-11-23 02:56:16,277 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [492501037] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:56:16,278 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:56:16,278 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:56:16,278 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1423494129] [2021-11-23 02:56:16,278 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:56:16,279 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:56:16,279 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:56:16,280 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:56:16,280 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:56:16,280 INFO L87 Difference]: Start difference. First operand 131 states and 184 transitions. Second operand has 3 states, 3 states have (on average 11.0) internal successors, (33), 3 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:56:16,342 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:56:16,342 INFO L93 Difference]: Finished difference Result 311 states and 446 transitions. [2021-11-23 02:56:16,343 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:56:16,343 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 11.0) internal successors, (33), 3 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 33 [2021-11-23 02:56:16,344 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:56:16,347 INFO L225 Difference]: With dead ends: 311 [2021-11-23 02:56:16,347 INFO L226 Difference]: Without dead ends: 199 [2021-11-23 02:56:16,348 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:56:16,350 INFO L933 BasicCegarLoop]: 72 mSDtfsCounter, 44 mSDsluCounter, 50 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 119 SdHoareTripleChecker+Invalid, 16 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 14 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:56:16,350 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [44 Valid, 119 Invalid, 16 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 14 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 02:56:16,352 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 199 states. [2021-11-23 02:56:16,376 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 199 to 197. [2021-11-23 02:56:16,377 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 197 states, 196 states have (on average 1.4081632653061225) internal successors, (276), 196 states have internal predecessors, (276), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:56:16,379 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 197 states to 197 states and 276 transitions. [2021-11-23 02:56:16,379 INFO L78 Accepts]: Start accepts. Automaton has 197 states and 276 transitions. Word has length 33 [2021-11-23 02:56:16,379 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:56:16,380 INFO L470 AbstractCegarLoop]: Abstraction has 197 states and 276 transitions. [2021-11-23 02:56:16,380 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 11.0) internal successors, (33), 3 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:56:16,380 INFO L276 IsEmpty]: Start isEmpty. Operand 197 states and 276 transitions. [2021-11-23 02:56:16,381 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-11-23 02:56:16,381 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:56:16,382 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] [2021-11-23 02:56:16,382 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-23 02:56:16,382 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:56:16,383 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:56:16,383 INFO L85 PathProgramCache]: Analyzing trace with hash 579194634, now seen corresponding path program 1 times [2021-11-23 02:56:16,383 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:56:16,384 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1791039862] [2021-11-23 02:56:16,384 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:56:16,384 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:56:16,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:56:16,554 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:56:16,554 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:56:16,554 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1791039862] [2021-11-23 02:56:16,554 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1791039862] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:56:16,555 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:56:16,555 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 02:56:16,555 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1703110714] [2021-11-23 02:56:16,555 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:56:16,556 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:56:16,556 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:56:16,557 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:56:16,557 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:56:16,557 INFO L87 Difference]: Start difference. First operand 197 states and 276 transitions. Second operand has 5 states, 5 states have (on average 7.2) internal successors, (36), 5 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:56:16,759 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:56:16,759 INFO L93 Difference]: Finished difference Result 643 states and 911 transitions. [2021-11-23 02:56:16,760 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:56:16,761 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 7.2) internal successors, (36), 5 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 36 [2021-11-23 02:56:16,765 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:56:16,768 INFO L225 Difference]: With dead ends: 643 [2021-11-23 02:56:16,768 INFO L226 Difference]: Without dead ends: 465 [2021-11-23 02:56:16,770 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:56:16,777 INFO L933 BasicCegarLoop]: 99 mSDtfsCounter, 126 mSDsluCounter, 122 mSDsCounter, 0 mSdLazyCounter, 36 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 126 SdHoareTripleChecker+Valid, 218 SdHoareTripleChecker+Invalid, 39 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 36 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:56:16,779 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [126 Valid, 218 Invalid, 39 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 36 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:56:16,782 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 465 states. [2021-11-23 02:56:16,873 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 465 to 461. [2021-11-23 02:56:16,874 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 461 states, 460 states have (on average 1.4086956521739131) internal successors, (648), 460 states have internal predecessors, (648), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:56:16,877 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 461 states to 461 states and 648 transitions. [2021-11-23 02:56:16,877 INFO L78 Accepts]: Start accepts. Automaton has 461 states and 648 transitions. Word has length 36 [2021-11-23 02:56:16,877 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:56:16,878 INFO L470 AbstractCegarLoop]: Abstraction has 461 states and 648 transitions. [2021-11-23 02:56:16,878 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 7.2) internal successors, (36), 5 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:56:16,878 INFO L276 IsEmpty]: Start isEmpty. Operand 461 states and 648 transitions. [2021-11-23 02:56:16,880 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-11-23 02:56:16,880 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:56:16,880 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] [2021-11-23 02:56:16,880 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-23 02:56:16,881 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:56:16,881 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:56:16,882 INFO L85 PathProgramCache]: Analyzing trace with hash 518999987, now seen corresponding path program 1 times [2021-11-23 02:56:16,882 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:56:16,882 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [951957518] [2021-11-23 02:56:16,882 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:56:16,882 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:56:16,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:56:16,937 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:56:16,937 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:56:16,937 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [951957518] [2021-11-23 02:56:16,937 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [951957518] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:56:16,938 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:56:16,938 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:56:16,938 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1295677176] [2021-11-23 02:56:16,938 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:56:16,939 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:56:16,939 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:56:16,940 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:56:16,940 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:56:16,940 INFO L87 Difference]: Start difference. First operand 461 states and 648 transitions. Second operand has 5 states, 5 states have (on average 7.6) internal successors, (38), 4 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:56:17,155 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:56:17,155 INFO L93 Difference]: Finished difference Result 1186 states and 1688 transitions. [2021-11-23 02:56:17,156 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:56:17,156 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 7.6) internal successors, (38), 4 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 38 [2021-11-23 02:56:17,156 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:56:17,161 INFO L225 Difference]: With dead ends: 1186 [2021-11-23 02:56:17,162 INFO L226 Difference]: Without dead ends: 744 [2021-11-23 02:56:17,163 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-11-23 02:56:17,164 INFO L933 BasicCegarLoop]: 41 mSDtfsCounter, 284 mSDsluCounter, 41 mSDsCounter, 0 mSdLazyCounter, 65 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 284 SdHoareTripleChecker+Valid, 82 SdHoareTripleChecker+Invalid, 69 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 65 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:56:17,165 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [284 Valid, 82 Invalid, 69 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 65 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:56:17,167 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 744 states. [2021-11-23 02:56:17,252 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 744 to 742. [2021-11-23 02:56:17,254 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 742 states, 741 states have (on average 1.4062078272604588) internal successors, (1042), 741 states have internal predecessors, (1042), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:56:17,257 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 742 states to 742 states and 1042 transitions. [2021-11-23 02:56:17,258 INFO L78 Accepts]: Start accepts. Automaton has 742 states and 1042 transitions. Word has length 38 [2021-11-23 02:56:17,258 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:56:17,258 INFO L470 AbstractCegarLoop]: Abstraction has 742 states and 1042 transitions. [2021-11-23 02:56:17,259 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 7.6) internal successors, (38), 4 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:56:17,259 INFO L276 IsEmpty]: Start isEmpty. Operand 742 states and 1042 transitions. [2021-11-23 02:56:17,260 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-11-23 02:56:17,260 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:56:17,261 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] [2021-11-23 02:56:17,261 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-23 02:56:17,261 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:56:17,262 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:56:17,262 INFO L85 PathProgramCache]: Analyzing trace with hash 331633624, now seen corresponding path program 1 times [2021-11-23 02:56:17,262 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:56:17,263 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [927842985] [2021-11-23 02:56:17,263 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:56:17,263 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:56:17,283 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:56:17,451 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:56:17,451 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:56:17,451 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [927842985] [2021-11-23 02:56:17,452 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [927842985] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:56:17,452 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:56:17,452 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-11-23 02:56:17,452 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2145101957] [2021-11-23 02:56:17,453 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:56:17,453 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-23 02:56:17,453 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:56:17,454 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-23 02:56:17,454 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2021-11-23 02:56:17,454 INFO L87 Difference]: Start difference. First operand 742 states and 1042 transitions. Second operand has 8 states, 8 states have (on average 4.75) internal successors, (38), 8 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:56:17,820 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:56:17,820 INFO L93 Difference]: Finished difference Result 1571 states and 2228 transitions. [2021-11-23 02:56:17,821 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-23 02:56:17,821 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 4.75) internal successors, (38), 8 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 38 [2021-11-23 02:56:17,822 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:56:17,831 INFO L225 Difference]: With dead ends: 1571 [2021-11-23 02:56:17,832 INFO L226 Difference]: Without dead ends: 1569 [2021-11-23 02:56:17,833 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=63, Invalid=119, Unknown=0, NotChecked=0, Total=182 [2021-11-23 02:56:17,834 INFO L933 BasicCegarLoop]: 176 mSDtfsCounter, 463 mSDsluCounter, 430 mSDsCounter, 0 mSdLazyCounter, 64 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 463 SdHoareTripleChecker+Valid, 599 SdHoareTripleChecker+Invalid, 76 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 64 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:56:17,834 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [463 Valid, 599 Invalid, 76 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 64 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:56:17,836 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1569 states. [2021-11-23 02:56:17,959 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1569 to 853. [2021-11-23 02:56:17,961 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 853 states, 852 states have (on average 1.4049295774647887) internal successors, (1197), 852 states have internal predecessors, (1197), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:56:17,966 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 853 states to 853 states and 1197 transitions. [2021-11-23 02:56:17,966 INFO L78 Accepts]: Start accepts. Automaton has 853 states and 1197 transitions. Word has length 38 [2021-11-23 02:56:17,966 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:56:17,966 INFO L470 AbstractCegarLoop]: Abstraction has 853 states and 1197 transitions. [2021-11-23 02:56:17,967 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 4.75) internal successors, (38), 8 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:56:17,967 INFO L276 IsEmpty]: Start isEmpty. Operand 853 states and 1197 transitions. [2021-11-23 02:56:17,969 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-11-23 02:56:17,969 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:56:17,969 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-23 02:56:17,969 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-23 02:56:17,970 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:56:17,970 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:56:17,970 INFO L85 PathProgramCache]: Analyzing trace with hash 426812810, now seen corresponding path program 1 times [2021-11-23 02:56:17,970 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:56:17,971 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1546832789] [2021-11-23 02:56:17,971 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:56:17,971 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:56:18,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:56:18,420 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:56:18,420 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:56:18,421 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1546832789] [2021-11-23 02:56:18,421 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1546832789] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:56:18,421 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1355299159] [2021-11-23 02:56:18,421 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:56:18,421 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:56:18,422 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_299144f6-6ee8-4996-ad41-e9f41109532a/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:56:18,423 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_299144f6-6ee8-4996-ad41-e9f41109532a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:56:18,428 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_299144f6-6ee8-4996-ad41-e9f41109532a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-23 02:56:18,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:56:18,549 INFO L263 TraceCheckSpWp]: Trace formula consists of 232 conjuncts, 48 conjunts are in the unsatisfiable core [2021-11-23 02:56:18,557 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:56:20,253 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:56:20,253 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:56:25,002 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:56:25,002 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1355299159] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:56:25,002 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1888101231] [2021-11-23 02:56:25,026 INFO L159 IcfgInterpreter]: Started Sifa with 39 locations of interest [2021-11-23 02:56:25,026 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:56:25,032 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:56:25,041 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:56:25,042 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:56:25,393 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:56:25,395 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:56:25,403 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 16 [2021-11-23 02:56:25,421 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:56:25,422 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:56:25,422 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:56:25,424 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 6 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 16 [2021-11-23 02:56:54,929 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:57:08,472 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10830#(and (<= |ULTIMATE.start_main_~check__tmp~0#1| 1) (<= 0 ~id3~0) (<= 0 (+ ~p3_new~0 1)) (<= 0 ~mode1~0) (<= |ULTIMATE.start_main_~assert__arg~0#1| 1) (<= 0 |ULTIMATE.start_main_~check__tmp~0#1|) (<= 0 (+ ~p1_old~0 1)) (<= 0 ~id1~0) (<= 0 ~__return_6075~0) (<= (+ ~p1_new~0 1) 0) (<= |ULTIMATE.start_main_~main__c1~0#1| 1) (<= 0 ~mode3~0) (<= ~send1~0 127) (<= ~st1~0 0) (<= 0 (+ ~p3_old~0 1)) (<= 0 |ULTIMATE.start_main_~main__i2~0#1|) (<= |#NULL.offset| 0) (<= ~mode2~0 1) (<= 0 ~st1~0) (<= 0 ~st2~0) (<= ~p1~0 0) (<= ~__return_main~0 0) (<= ~mode3~0 1) (<= 0 ~p2~0) (<= 0 ~send2~0) (<= 0 (+ |ULTIMATE.start_main_~node1__m1~0#1| 1)) (<= ~id1~0 127) (<= (+ ~p3_old~0 1) 0) (<= |ULTIMATE.start_main_~__tmp_1~0#1| 1) (<= ~send2~0 127) (<= 0 |ULTIMATE.start_main_~__tmp_1~0#1|) (<= 0 (+ ~p2_new~0 1)) (<= (+ |ULTIMATE.start_main_~node1__m1~0#1| 1) 0) (<= |ULTIMATE.start_main_~main__i2~0#1| 0) (<= (+ ~nomsg~0 1) 0) (<= ~mode1~0 1) (<= ~st2~0 0) (<= (+ ~p2_new~0 1) 0) (<= 0 ~__return_main~0) (<= ~id3~0 127) (<= 0 ~id2~0) (<= 0 (+ ~nomsg~0 1)) (<= ~__return_6075~0 1) (<= ~p2~0 0) (<= 0 ~mode2~0) (<= ~id2~0 127) (<= 0 ~st3~0) (<= (+ ~p3_new~0 1) 0) (<= |ULTIMATE.start_main_~init__tmp~0#1| 1) (<= 0 |#NULL.offset|) (<= 0 (+ |ULTIMATE.start_main_~node2__m2~0#1| 1)) (= ~p3~0 0) (<= 0 (+ ~p1_new~0 1)) (= (mod |ULTIMATE.start_main_~assert__arg~0#1| 256) 0) (<= (+ ~p1_old~0 1) 0) (<= 0 ~p1~0) (<= 0 |#StackHeapBarrier|) (<= 0 ~send1~0) (<= 0 |ULTIMATE.start_main_~main__c1~0#1|) (<= (+ |ULTIMATE.start_main_~node2__m2~0#1| 1) 0) (<= ~__return_5979~0 1) (<= 0 |ULTIMATE.start_main_~assert__arg~0#1|) (<= 1 |ULTIMATE.start_main_~init__tmp~0#1|) (<= 1 ~__return_5979~0) (= |#NULL.base| 0))' at error location [2021-11-23 02:57:08,472 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:57:08,473 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:57:08,473 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 15, 15] total 38 [2021-11-23 02:57:08,474 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1259756002] [2021-11-23 02:57:08,474 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:57:08,477 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2021-11-23 02:57:08,477 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:57:08,478 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-11-23 02:57:08,482 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=753, Invalid=4503, Unknown=0, NotChecked=0, Total=5256 [2021-11-23 02:57:08,482 INFO L87 Difference]: Start difference. First operand 853 states and 1197 transitions. Second operand has 38 states, 38 states have (on average 3.3421052631578947) internal successors, (127), 38 states have internal predecessors, (127), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:57:37,040 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:57:37,040 INFO L93 Difference]: Finished difference Result 9029 states and 12667 transitions. [2021-11-23 02:57:37,041 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 163 states. [2021-11-23 02:57:37,041 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 3.3421052631578947) internal successors, (127), 38 states have internal predecessors, (127), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 46 [2021-11-23 02:57:37,042 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:57:37,097 INFO L225 Difference]: With dead ends: 9029 [2021-11-23 02:57:37,098 INFO L226 Difference]: Without dead ends: 7758 [2021-11-23 02:57:37,126 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 304 GetRequests, 76 SyntacticMatches, 3 SemanticMatches, 225 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22230 ImplicationChecksByTransitivity, 38.0s TimeCoverageRelationStatistics Valid=7372, Invalid=43930, Unknown=0, NotChecked=0, Total=51302 [2021-11-23 02:57:37,127 INFO L933 BasicCegarLoop]: 141 mSDtfsCounter, 6357 mSDsluCounter, 2348 mSDsCounter, 0 mSdLazyCounter, 3176 mSolverCounterSat, 600 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6357 SdHoareTripleChecker+Valid, 2487 SdHoareTripleChecker+Invalid, 3776 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 600 IncrementalHoareTripleChecker+Valid, 3176 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:57:37,128 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6357 Valid, 2487 Invalid, 3776 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [600 Valid, 3176 Invalid, 0 Unknown, 0 Unchecked, 4.1s Time] [2021-11-23 02:57:37,140 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7758 states. [2021-11-23 02:57:37,879 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7758 to 4088. [2021-11-23 02:57:37,891 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4088 states, 4087 states have (on average 1.3650599461707855) internal successors, (5579), 4087 states have internal predecessors, (5579), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:57:37,912 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4088 states to 4088 states and 5579 transitions. [2021-11-23 02:57:37,912 INFO L78 Accepts]: Start accepts. Automaton has 4088 states and 5579 transitions. Word has length 46 [2021-11-23 02:57:37,913 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:57:37,913 INFO L470 AbstractCegarLoop]: Abstraction has 4088 states and 5579 transitions. [2021-11-23 02:57:37,914 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 3.3421052631578947) internal successors, (127), 38 states have internal predecessors, (127), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:57:37,914 INFO L276 IsEmpty]: Start isEmpty. Operand 4088 states and 5579 transitions. [2021-11-23 02:57:37,915 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-11-23 02:57:37,916 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:57:37,916 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-23 02:57:37,959 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_299144f6-6ee8-4996-ad41-e9f41109532a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-23 02:57:38,129 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_299144f6-6ee8-4996-ad41-e9f41109532a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:57:38,130 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:57:38,130 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:57:38,130 INFO L85 PathProgramCache]: Analyzing trace with hash -893068205, now seen corresponding path program 1 times [2021-11-23 02:57:38,130 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:57:38,131 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1507255322] [2021-11-23 02:57:38,131 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:57:38,131 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:57:38,153 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:57:38,197 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 02:57:38,197 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:57:38,197 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1507255322] [2021-11-23 02:57:38,198 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1507255322] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:57:38,198 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:57:38,198 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:57:38,198 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1490236344] [2021-11-23 02:57:38,199 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:57:38,199 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:57:38,200 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:57:38,201 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:57:38,201 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:57:38,201 INFO L87 Difference]: Start difference. First operand 4088 states and 5579 transitions. Second operand has 5 states, 5 states have (on average 9.0) internal successors, (45), 4 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:57:39,445 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:57:39,445 INFO L93 Difference]: Finished difference Result 10038 states and 13794 transitions. [2021-11-23 02:57:39,446 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:57:39,446 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 9.0) internal successors, (45), 4 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 46 [2021-11-23 02:57:39,447 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:57:39,488 INFO L225 Difference]: With dead ends: 10038 [2021-11-23 02:57:39,488 INFO L226 Difference]: Without dead ends: 6017 [2021-11-23 02:57:39,498 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-11-23 02:57:39,500 INFO L933 BasicCegarLoop]: 43 mSDtfsCounter, 263 mSDsluCounter, 49 mSDsCounter, 0 mSdLazyCounter, 67 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 263 SdHoareTripleChecker+Valid, 92 SdHoareTripleChecker+Invalid, 71 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 67 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:57:39,500 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [263 Valid, 92 Invalid, 71 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 67 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:57:39,511 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6017 states. [2021-11-23 02:57:40,472 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6017 to 5943. [2021-11-23 02:57:40,484 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5943 states, 5942 states have (on average 1.3648603163917872) internal successors, (8110), 5942 states have internal predecessors, (8110), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:57:40,502 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5943 states to 5943 states and 8110 transitions. [2021-11-23 02:57:40,503 INFO L78 Accepts]: Start accepts. Automaton has 5943 states and 8110 transitions. Word has length 46 [2021-11-23 02:57:40,503 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:57:40,503 INFO L470 AbstractCegarLoop]: Abstraction has 5943 states and 8110 transitions. [2021-11-23 02:57:40,504 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 9.0) internal successors, (45), 4 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:57:40,504 INFO L276 IsEmpty]: Start isEmpty. Operand 5943 states and 8110 transitions. [2021-11-23 02:57:40,505 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-11-23 02:57:40,505 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:57:40,505 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-23 02:57:40,505 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-23 02:57:40,506 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:57:40,506 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:57:40,506 INFO L85 PathProgramCache]: Analyzing trace with hash 733096462, now seen corresponding path program 1 times [2021-11-23 02:57:40,507 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:57:40,507 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [811760976] [2021-11-23 02:57:40,507 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:57:40,507 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:57:40,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:57:40,890 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:57:40,890 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:57:40,890 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [811760976] [2021-11-23 02:57:40,891 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [811760976] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:57:40,891 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [983306393] [2021-11-23 02:57:40,891 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:57:40,891 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:57:40,891 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_299144f6-6ee8-4996-ad41-e9f41109532a/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:57:40,897 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_299144f6-6ee8-4996-ad41-e9f41109532a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:57:40,899 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_299144f6-6ee8-4996-ad41-e9f41109532a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-23 02:57:40,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:57:40,980 INFO L263 TraceCheckSpWp]: Trace formula consists of 232 conjuncts, 48 conjunts are in the unsatisfiable core [2021-11-23 02:57:40,986 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:57:42,125 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:57:42,125 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:57:46,843 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:57:46,844 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [983306393] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:57:46,844 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [32543193] [2021-11-23 02:57:46,847 INFO L159 IcfgInterpreter]: Started Sifa with 39 locations of interest [2021-11-23 02:57:46,847 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:57:46,847 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:57:46,848 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:57:46,849 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:57:46,914 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:57:46,915 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:57:46,916 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:57:46,918 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 6 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 16 [2021-11-23 02:57:46,929 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:57:46,930 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:57:46,932 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 16 [2021-11-23 02:58:07,567 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:58:26,040 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '58853#(and (<= |ULTIMATE.start_main_~check__tmp~0#1| 1) (<= ~send3~0 127) (<= 0 ~id3~0) (<= 0 (+ ~p3_new~0 1)) (<= ~st3~0 0) (<= |ULTIMATE.start_main_~assert__arg~0#1| 1) (<= 0 |ULTIMATE.start_main_~check__tmp~0#1|) (<= 0 (+ ~p1_old~0 1)) (<= 0 ~id1~0) (<= 0 ~__return_6075~0) (<= 0 (+ |ULTIMATE.start_main_~node3__m3~0#1| 1)) (= ~p2~0 0) (<= (+ ~p1_new~0 1) 0) (<= |ULTIMATE.start_main_~main__c1~0#1| 1) (<= 0 ~mode3~0) (<= ~mode2~0 1) (<= 0 ~st1~0) (<= 0 ~st2~0) (<= ~mode3~0 1) (<= 0 ~send2~0) (<= 0 (+ ~p2_old~0 1)) (<= ~id1~0 127) (<= |ULTIMATE.start_main_~__tmp_1~0#1| 1) (<= ~send2~0 127) (= |ULTIMATE.start_main_~init__tmp~0#1| 1) (<= 0 |ULTIMATE.start_main_~__tmp_1~0#1|) (<= 0 (+ ~p2_new~0 1)) (<= (+ ~nomsg~0 1) 0) (<= ~mode1~0 1) (<= ~st2~0 0) (<= (+ ~p2_new~0 1) 0) (<= ~id3~0 127) (<= 0 ~id2~0) (= |#NULL.offset| 0) (<= 0 (+ ~nomsg~0 1)) (<= ~__return_6075~0 1) (<= 0 ~mode2~0) (<= ~id2~0 127) (<= 0 ~st3~0) (<= (+ ~p3_new~0 1) 0) (<= 0 (+ |ULTIMATE.start_main_~node2__m2~0#1| 1)) (= ~p3~0 0) (<= (+ ~p2_old~0 1) 0) (<= 0 (+ ~p1_new~0 1)) (= (mod |ULTIMATE.start_main_~assert__arg~0#1| 256) 0) (<= (+ ~p1_old~0 1) 0) (<= 0 ~send3~0) (= ~p1~0 0) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_main_~main__c1~0#1|) (<= (+ |ULTIMATE.start_main_~node2__m2~0#1| 1) 0) (= ~__return_main~0 0) (<= ~__return_5979~0 1) (<= (+ |ULTIMATE.start_main_~node3__m3~0#1| 1) 0) (<= 0 |ULTIMATE.start_main_~assert__arg~0#1|) (<= 1 ~__return_5979~0) (= |#NULL.base| 0) (= |ULTIMATE.start_main_~main__i2~0#1| 0))' at error location [2021-11-23 02:58:26,040 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:58:26,041 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:58:26,041 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 15, 15] total 38 [2021-11-23 02:58:26,041 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1210236427] [2021-11-23 02:58:26,042 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:58:26,042 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2021-11-23 02:58:26,042 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:58:26,043 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-11-23 02:58:26,045 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=719, Invalid=4537, Unknown=0, NotChecked=0, Total=5256 [2021-11-23 02:58:26,046 INFO L87 Difference]: Start difference. First operand 5943 states and 8110 transitions. Second operand has 38 states, 38 states have (on average 3.3421052631578947) internal successors, (127), 38 states have internal predecessors, (127), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:59:04,874 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:59:04,875 INFO L93 Difference]: Finished difference Result 33523 states and 45609 transitions. [2021-11-23 02:59:04,875 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 199 states. [2021-11-23 02:59:04,875 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 3.3421052631578947) internal successors, (127), 38 states have internal predecessors, (127), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 46 [2021-11-23 02:59:04,876 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:59:04,992 INFO L225 Difference]: With dead ends: 33523 [2021-11-23 02:59:04,992 INFO L226 Difference]: Without dead ends: 29113 [2021-11-23 02:59:05,018 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 341 GetRequests, 77 SyntacticMatches, 2 SemanticMatches, 262 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30407 ImplicationChecksByTransitivity, 48.5s TimeCoverageRelationStatistics Valid=11131, Invalid=58301, Unknown=0, NotChecked=0, Total=69432 [2021-11-23 02:59:05,019 INFO L933 BasicCegarLoop]: 156 mSDtfsCounter, 6782 mSDsluCounter, 2888 mSDsCounter, 0 mSdLazyCounter, 3840 mSolverCounterSat, 656 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6782 SdHoareTripleChecker+Valid, 3040 SdHoareTripleChecker+Invalid, 4496 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 656 IncrementalHoareTripleChecker+Valid, 3840 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.9s IncrementalHoareTripleChecker+Time [2021-11-23 02:59:05,019 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6782 Valid, 3040 Invalid, 4496 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [656 Valid, 3840 Invalid, 0 Unknown, 0 Unchecked, 4.9s Time] [2021-11-23 02:59:05,066 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29113 states. [2021-11-23 02:59:07,951 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29113 to 16469. [2021-11-23 02:59:07,971 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16469 states, 16468 states have (on average 1.3589385474860336) internal successors, (22379), 16468 states have internal predecessors, (22379), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:59:08,002 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16469 states to 16469 states and 22379 transitions. [2021-11-23 02:59:08,003 INFO L78 Accepts]: Start accepts. Automaton has 16469 states and 22379 transitions. Word has length 46 [2021-11-23 02:59:08,003 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:59:08,003 INFO L470 AbstractCegarLoop]: Abstraction has 16469 states and 22379 transitions. [2021-11-23 02:59:08,003 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 3.3421052631578947) internal successors, (127), 38 states have internal predecessors, (127), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:59:08,004 INFO L276 IsEmpty]: Start isEmpty. Operand 16469 states and 22379 transitions. [2021-11-23 02:59:08,005 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-11-23 02:59:08,006 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:59:08,006 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-23 02:59:08,036 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_299144f6-6ee8-4996-ad41-e9f41109532a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-23 02:59:08,222 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_299144f6-6ee8-4996-ad41-e9f41109532a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:59:08,223 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:59:08,223 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:59:08,224 INFO L85 PathProgramCache]: Analyzing trace with hash 296484125, now seen corresponding path program 1 times [2021-11-23 02:59:08,224 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:59:08,224 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [101920054] [2021-11-23 02:59:08,224 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:59:08,224 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:59:08,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:59:08,328 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 02:59:08,329 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:59:08,329 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [101920054] [2021-11-23 02:59:08,329 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [101920054] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:59:08,329 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:59:08,329 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:59:08,329 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1222878698] [2021-11-23 02:59:08,329 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:59:08,330 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:59:08,330 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:59:08,330 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:59:08,330 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:59:08,331 INFO L87 Difference]: Start difference. First operand 16469 states and 22379 transitions. Second operand has 5 states, 5 states have (on average 9.2) internal successors, (46), 4 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:59:11,088 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:59:11,089 INFO L93 Difference]: Finished difference Result 33096 states and 45089 transitions. [2021-11-23 02:59:11,089 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:59:11,089 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 9.2) internal successors, (46), 4 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 49 [2021-11-23 02:59:11,089 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:59:11,136 INFO L225 Difference]: With dead ends: 33096 [2021-11-23 02:59:11,137 INFO L226 Difference]: Without dead ends: 17008 [2021-11-23 02:59:11,161 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-11-23 02:59:11,162 INFO L933 BasicCegarLoop]: 46 mSDtfsCounter, 281 mSDsluCounter, 35 mSDsCounter, 0 mSdLazyCounter, 68 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 281 SdHoareTripleChecker+Valid, 81 SdHoareTripleChecker+Invalid, 70 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 68 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:59:11,163 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [281 Valid, 81 Invalid, 70 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 68 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:59:11,184 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17008 states. [2021-11-23 02:59:13,831 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17008 to 17006. [2021-11-23 02:59:13,848 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17006 states, 17005 states have (on average 1.3501323140252868) internal successors, (22959), 17005 states have internal predecessors, (22959), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:59:13,874 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17006 states to 17006 states and 22959 transitions. [2021-11-23 02:59:13,874 INFO L78 Accepts]: Start accepts. Automaton has 17006 states and 22959 transitions. Word has length 49 [2021-11-23 02:59:13,875 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:59:13,875 INFO L470 AbstractCegarLoop]: Abstraction has 17006 states and 22959 transitions. [2021-11-23 02:59:13,875 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 9.2) internal successors, (46), 4 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:59:13,875 INFO L276 IsEmpty]: Start isEmpty. Operand 17006 states and 22959 transitions. [2021-11-23 02:59:13,877 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-11-23 02:59:13,877 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:59:13,878 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-23 02:59:13,878 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-11-23 02:59:13,878 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:59:13,878 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:59:13,879 INFO L85 PathProgramCache]: Analyzing trace with hash 432245336, now seen corresponding path program 1 times [2021-11-23 02:59:13,879 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:59:13,879 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [186413199] [2021-11-23 02:59:13,879 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:59:13,879 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:59:13,908 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:59:14,519 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:59:14,519 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:59:14,519 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [186413199] [2021-11-23 02:59:14,519 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [186413199] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:59:14,519 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [278559342] [2021-11-23 02:59:14,519 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:59:14,520 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:59:14,520 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_299144f6-6ee8-4996-ad41-e9f41109532a/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:59:14,521 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_299144f6-6ee8-4996-ad41-e9f41109532a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:59:14,521 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_299144f6-6ee8-4996-ad41-e9f41109532a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-23 02:59:14,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:59:14,594 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 47 conjunts are in the unsatisfiable core [2021-11-23 02:59:14,599 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:59:15,872 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:59:15,872 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:59:20,887 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:59:20,888 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [278559342] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:59:20,888 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2004326852] [2021-11-23 02:59:20,891 INFO L159 IcfgInterpreter]: Started Sifa with 42 locations of interest [2021-11-23 02:59:20,891 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:59:20,892 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:59:20,892 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:59:20,892 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:59:20,966 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:59:20,966 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:59:20,967 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:59:20,968 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 6 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 16 [2021-11-23 02:59:20,982 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:59:20,983 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:59:20,984 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 16 [2021-11-23 02:59:42,247 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:00:00,264 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '221312#(and (<= |ULTIMATE.start_main_~check__tmp~0#1| 1) (<= ~send3~0 127) (<= 0 ~id3~0) (<= 0 (+ ~p3_new~0 1)) (<= ~st3~0 0) (<= |ULTIMATE.start_main_~assert__arg~0#1| 1) (<= 0 |ULTIMATE.start_main_~check__tmp~0#1|) (<= 0 ~id1~0) (<= 0 ~__return_6075~0) (<= 0 (+ |ULTIMATE.start_main_~node3__m3~0#1| 1)) (= ~p2~0 0) (<= (+ ~p1_new~0 1) 0) (<= |ULTIMATE.start_main_~main__c1~0#1| 1) (<= 0 ~mode3~0) (<= ~mode2~0 1) (<= 0 ~st1~0) (<= 0 ~st2~0) (<= ~mode3~0 1) (<= 0 (+ ~p2_old~0 1)) (<= ~id1~0 127) (<= |ULTIMATE.start_main_~__tmp_1~0#1| 1) (= |ULTIMATE.start_main_~init__tmp~0#1| 1) (<= 0 |ULTIMATE.start_main_~__tmp_1~0#1|) (<= 0 (+ ~p2_new~0 1)) (<= (+ ~nomsg~0 1) 0) (<= ~mode1~0 1) (<= (+ ~p2_new~0 1) 0) (<= ~id3~0 127) (<= 0 ~id2~0) (= |#NULL.offset| 0) (<= 0 (+ ~nomsg~0 1)) (<= ~__return_6075~0 1) (<= 0 ~mode2~0) (<= ~id2~0 127) (<= 0 ~st3~0) (<= (+ ~p3_new~0 1) 0) (= ~p3~0 0) (<= (+ ~p2_old~0 1) 0) (<= 0 (+ ~p1_new~0 1)) (= (mod |ULTIMATE.start_main_~assert__arg~0#1| 256) 0) (<= 0 ~send3~0) (= ~p1~0 0) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_main_~main__c1~0#1|) (= ~__return_main~0 0) (<= ~__return_5979~0 1) (<= (+ |ULTIMATE.start_main_~node3__m3~0#1| 1) 0) (<= 0 |ULTIMATE.start_main_~assert__arg~0#1|) (<= 1 ~__return_5979~0) (= |#NULL.base| 0) (= |ULTIMATE.start_main_~main__i2~0#1| 0))' at error location [2021-11-23 03:00:00,264 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:00:00,264 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 03:00:00,265 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 16, 16] total 48 [2021-11-23 03:00:00,265 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1361800588] [2021-11-23 03:00:00,265 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 03:00:00,266 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2021-11-23 03:00:00,266 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:00:00,267 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-11-23 03:00:00,268 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=907, Invalid=6233, Unknown=0, NotChecked=0, Total=7140 [2021-11-23 03:00:00,268 INFO L87 Difference]: Start difference. First operand 17006 states and 22959 transitions. Second operand has 48 states, 48 states have (on average 3.0) internal successors, (144), 48 states have internal predecessors, (144), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:00:43,579 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:00:43,579 INFO L93 Difference]: Finished difference Result 53288 states and 72097 transitions. [2021-11-23 03:00:43,580 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 187 states. [2021-11-23 03:00:43,580 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 3.0) internal successors, (144), 48 states have internal predecessors, (144), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 49 [2021-11-23 03:00:43,580 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:00:43,662 INFO L225 Difference]: With dead ends: 53288 [2021-11-23 03:00:43,663 INFO L226 Difference]: Without dead ends: 36677 [2021-11-23 03:00:43,704 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 345 GetRequests, 78 SyntacticMatches, 3 SemanticMatches, 264 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28660 ImplicationChecksByTransitivity, 49.7s TimeCoverageRelationStatistics Valid=10889, Invalid=59601, Unknown=0, NotChecked=0, Total=70490 [2021-11-23 03:00:43,705 INFO L933 BasicCegarLoop]: 210 mSDtfsCounter, 5855 mSDsluCounter, 3790 mSDsCounter, 0 mSdLazyCounter, 6258 mSolverCounterSat, 514 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5855 SdHoareTripleChecker+Valid, 4000 SdHoareTripleChecker+Invalid, 6772 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 514 IncrementalHoareTripleChecker+Valid, 6258 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.8s IncrementalHoareTripleChecker+Time [2021-11-23 03:00:43,705 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5855 Valid, 4000 Invalid, 6772 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [514 Valid, 6258 Invalid, 0 Unknown, 0 Unchecked, 5.8s Time] [2021-11-23 03:00:43,751 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36677 states. [2021-11-23 03:00:48,162 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36677 to 20835. [2021-11-23 03:00:48,181 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20835 states, 20834 states have (on average 1.3475568781798983) internal successors, (28075), 20834 states have internal predecessors, (28075), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:00:48,296 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20835 states to 20835 states and 28075 transitions. [2021-11-23 03:00:48,296 INFO L78 Accepts]: Start accepts. Automaton has 20835 states and 28075 transitions. Word has length 49 [2021-11-23 03:00:48,296 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:00:48,297 INFO L470 AbstractCegarLoop]: Abstraction has 20835 states and 28075 transitions. [2021-11-23 03:00:48,297 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 48 states have (on average 3.0) internal successors, (144), 48 states have internal predecessors, (144), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:00:48,297 INFO L276 IsEmpty]: Start isEmpty. Operand 20835 states and 28075 transitions. [2021-11-23 03:00:48,299 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-11-23 03:00:48,300 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:00:48,300 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-23 03:00:48,341 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_299144f6-6ee8-4996-ad41-e9f41109532a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-23 03:00:48,525 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_299144f6-6ee8-4996-ad41-e9f41109532a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-11-23 03:00:48,526 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:00:48,526 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:00:48,526 INFO L85 PathProgramCache]: Analyzing trace with hash -1830946010, now seen corresponding path program 1 times [2021-11-23 03:00:48,526 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:00:48,526 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1074539155] [2021-11-23 03:00:48,526 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:00:48,527 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:00:48,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:00:50,683 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:00:50,683 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:00:50,683 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1074539155] [2021-11-23 03:00:50,683 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1074539155] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:00:50,683 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1543275256] [2021-11-23 03:00:50,683 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:00:50,684 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:00:50,684 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_299144f6-6ee8-4996-ad41-e9f41109532a/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:00:50,684 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_299144f6-6ee8-4996-ad41-e9f41109532a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:00:50,685 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_299144f6-6ee8-4996-ad41-e9f41109532a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-23 03:00:50,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:00:50,973 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 85 conjunts are in the unsatisfiable core [2021-11-23 03:00:50,977 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:02:37,302 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:02:37,302 INFO L328 TraceCheckSpWp]: Computing backward predicates...