./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/seq-mthreaded/pals_opt-floodmax.3.1.ufo.UNBOUNDED.pals.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 6b4ec56b Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07a939e3-8c3f-473e-9bde-60d99d93cf06/bin/utaipan-6cKwYrpEi9/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07a939e3-8c3f-473e-9bde-60d99d93cf06/bin/utaipan-6cKwYrpEi9/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07a939e3-8c3f-473e-9bde-60d99d93cf06/bin/utaipan-6cKwYrpEi9/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07a939e3-8c3f-473e-9bde-60d99d93cf06/bin/utaipan-6cKwYrpEi9/config/TaipanReach.xml -i ../../sv-benchmarks/c/seq-mthreaded/pals_opt-floodmax.3.1.ufo.UNBOUNDED.pals.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07a939e3-8c3f-473e-9bde-60d99d93cf06/bin/utaipan-6cKwYrpEi9/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07a939e3-8c3f-473e-9bde-60d99d93cf06/bin/utaipan-6cKwYrpEi9 --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 a2c5c77b8d7714bea640ff99a5b0e1a19cf307340ccbaffec9b7e0efde04f6ec --- Real Ultimate output --- [0.001s][warning][os,container] Duplicate cpuset controllers detected. Picking /sys/fs/cgroup/cpuset, skipping /sys/fs/cgroup/cpuset. This is Ultimate 0.2.2-dev-6b4ec56 [2022-11-20 20:14:39,720 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-20 20:14:39,722 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-20 20:14:39,742 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-20 20:14:39,742 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-20 20:14:39,743 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-20 20:14:39,745 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-20 20:14:39,747 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-20 20:14:39,749 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-20 20:14:39,750 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-20 20:14:39,751 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-20 20:14:39,752 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-20 20:14:39,753 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-20 20:14:39,754 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-20 20:14:39,755 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-20 20:14:39,757 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-20 20:14:39,758 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-20 20:14:39,759 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-20 20:14:39,761 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-20 20:14:39,763 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-20 20:14:39,764 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-20 20:14:39,766 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-20 20:14:39,767 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-20 20:14:39,768 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-20 20:14:39,772 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-20 20:14:39,772 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-20 20:14:39,773 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-20 20:14:39,774 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-20 20:14:39,774 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-20 20:14:39,775 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-20 20:14:39,776 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-20 20:14:39,777 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-20 20:14:39,778 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-20 20:14:39,778 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-20 20:14:39,780 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-20 20:14:39,780 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-20 20:14:39,781 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-20 20:14:39,781 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-20 20:14:39,781 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-20 20:14:39,783 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-20 20:14:39,783 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-20 20:14:39,784 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07a939e3-8c3f-473e-9bde-60d99d93cf06/bin/utaipan-6cKwYrpEi9/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-20 20:14:39,808 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-20 20:14:39,808 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-20 20:14:39,809 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-20 20:14:39,809 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-20 20:14:39,810 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-20 20:14:39,810 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-20 20:14:39,810 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-20 20:14:39,811 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-20 20:14:39,811 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-20 20:14:39,811 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-20 20:14:39,811 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-20 20:14:39,811 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-20 20:14:39,812 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-20 20:14:39,812 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-20 20:14:39,812 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-20 20:14:39,813 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-20 20:14:39,813 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-20 20:14:39,813 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-20 20:14:39,814 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-20 20:14:39,814 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-20 20:14:39,814 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-20 20:14:39,815 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-20 20:14:39,815 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-20 20:14:39,815 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-20 20:14:39,815 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-20 20:14:39,815 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-20 20:14:39,816 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-20 20:14:39,816 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-20 20:14:39,816 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-20 20:14:39,816 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-20 20:14:39,817 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-20 20:14:39,817 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-20 20:14:39,817 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-20 20:14:39,817 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-20 20:14:39,818 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-20 20:14:39,818 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-20 20:14:39,818 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-20 20:14:39,818 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-20 20:14:39,819 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-20 20:14:39,819 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-20 20:14:39,819 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-20 20:14:39,819 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode 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_07a939e3-8c3f-473e-9bde-60d99d93cf06/bin/utaipan-6cKwYrpEi9/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07a939e3-8c3f-473e-9bde-60d99d93cf06/bin/utaipan-6cKwYrpEi9 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> a2c5c77b8d7714bea640ff99a5b0e1a19cf307340ccbaffec9b7e0efde04f6ec [2022-11-20 20:14:40,051 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-20 20:14:40,081 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-20 20:14:40,084 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-20 20:14:40,085 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-20 20:14:40,086 INFO L275 PluginConnector]: CDTParser initialized [2022-11-20 20:14:40,087 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07a939e3-8c3f-473e-9bde-60d99d93cf06/bin/utaipan-6cKwYrpEi9/../../sv-benchmarks/c/seq-mthreaded/pals_opt-floodmax.3.1.ufo.UNBOUNDED.pals.c [2022-11-20 20:14:43,296 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-11-20 20:14:43,555 INFO L351 CDTParser]: Found 1 translation units. [2022-11-20 20:14:43,556 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07a939e3-8c3f-473e-9bde-60d99d93cf06/sv-benchmarks/c/seq-mthreaded/pals_opt-floodmax.3.1.ufo.UNBOUNDED.pals.c [2022-11-20 20:14:43,566 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07a939e3-8c3f-473e-9bde-60d99d93cf06/bin/utaipan-6cKwYrpEi9/data/ead5531f3/c638b9fd217b4b33a6df4596a23e544a/FLAGd8605e329 [2022-11-20 20:14:43,580 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07a939e3-8c3f-473e-9bde-60d99d93cf06/bin/utaipan-6cKwYrpEi9/data/ead5531f3/c638b9fd217b4b33a6df4596a23e544a [2022-11-20 20:14:43,583 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-20 20:14:43,584 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-20 20:14:43,585 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-20 20:14:43,586 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-20 20:14:43,589 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-20 20:14:43,590 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 08:14:43" (1/1) ... [2022-11-20 20:14:43,591 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@29462edd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 08:14:43, skipping insertion in model container [2022-11-20 20:14:43,591 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 08:14:43" (1/1) ... [2022-11-20 20:14:43,599 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-20 20:14:43,630 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-20 20:14:43,850 WARN L237 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_07a939e3-8c3f-473e-9bde-60d99d93cf06/sv-benchmarks/c/seq-mthreaded/pals_opt-floodmax.3.1.ufo.UNBOUNDED.pals.c[12951,12964] [2022-11-20 20:14:43,855 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-20 20:14:43,867 INFO L203 MainTranslator]: Completed pre-run [2022-11-20 20:14:43,932 WARN L237 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_07a939e3-8c3f-473e-9bde-60d99d93cf06/sv-benchmarks/c/seq-mthreaded/pals_opt-floodmax.3.1.ufo.UNBOUNDED.pals.c[12951,12964] [2022-11-20 20:14:43,933 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-20 20:14:43,949 INFO L208 MainTranslator]: Completed translation [2022-11-20 20:14:43,950 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 08:14:43 WrapperNode [2022-11-20 20:14:43,950 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-20 20:14:43,951 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-20 20:14:43,951 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-20 20:14:43,952 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-20 20:14:43,959 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 08:14:43" (1/1) ... [2022-11-20 20:14:43,970 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 08:14:43" (1/1) ... [2022-11-20 20:14:44,004 INFO L138 Inliner]: procedures = 23, calls = 14, calls flagged for inlining = 9, calls inlined = 9, statements flattened = 443 [2022-11-20 20:14:44,005 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-20 20:14:44,006 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-20 20:14:44,006 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-20 20:14:44,006 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-20 20:14:44,015 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 08:14:43" (1/1) ... [2022-11-20 20:14:44,016 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 08:14:43" (1/1) ... [2022-11-20 20:14:44,020 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 08:14:43" (1/1) ... [2022-11-20 20:14:44,034 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 08:14:43" (1/1) ... [2022-11-20 20:14:44,043 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 08:14:43" (1/1) ... [2022-11-20 20:14:44,050 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 08:14:43" (1/1) ... [2022-11-20 20:14:44,064 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 08:14:43" (1/1) ... [2022-11-20 20:14:44,066 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 08:14:43" (1/1) ... [2022-11-20 20:14:44,070 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-20 20:14:44,071 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-20 20:14:44,071 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-20 20:14:44,071 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-20 20:14:44,072 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 08:14:43" (1/1) ... [2022-11-20 20:14:44,079 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-20 20:14:44,090 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07a939e3-8c3f-473e-9bde-60d99d93cf06/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:14:44,104 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07a939e3-8c3f-473e-9bde-60d99d93cf06/bin/utaipan-6cKwYrpEi9/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-20 20:14:44,130 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07a939e3-8c3f-473e-9bde-60d99d93cf06/bin/utaipan-6cKwYrpEi9/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-20 20:14:44,154 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-20 20:14:44,155 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-20 20:14:44,155 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-20 20:14:44,155 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-20 20:14:44,288 INFO L235 CfgBuilder]: Building ICFG [2022-11-20 20:14:44,304 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-20 20:14:45,001 INFO L276 CfgBuilder]: Performing block encoding [2022-11-20 20:14:45,703 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-20 20:14:45,703 INFO L300 CfgBuilder]: Removed 1 assume(true) statements. [2022-11-20 20:14:45,706 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 08:14:45 BoogieIcfgContainer [2022-11-20 20:14:45,707 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-20 20:14:45,712 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-20 20:14:45,712 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-20 20:14:45,716 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-20 20:14:45,716 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.11 08:14:43" (1/3) ... [2022-11-20 20:14:45,718 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@283ff36e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 08:14:45, skipping insertion in model container [2022-11-20 20:14:45,719 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 08:14:43" (2/3) ... [2022-11-20 20:14:45,719 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@283ff36e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 08:14:45, skipping insertion in model container [2022-11-20 20:14:45,720 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 08:14:45" (3/3) ... [2022-11-20 20:14:45,727 INFO L112 eAbstractionObserver]: Analyzing ICFG pals_opt-floodmax.3.1.ufo.UNBOUNDED.pals.c [2022-11-20 20:14:45,753 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-20 20:14:45,753 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-20 20:14:45,812 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-20 20:14:45,820 INFO L357 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, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@47f02234, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-20 20:14:45,820 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-11-20 20:14:45,825 INFO L276 IsEmpty]: Start isEmpty. Operand has 19 states, 17 states have (on average 1.7647058823529411) internal successors, (30), 18 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) [2022-11-20 20:14:45,835 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2022-11-20 20:14:45,835 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:14:45,836 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2022-11-20 20:14:45,837 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 20:14:45,842 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:14:45,843 INFO L85 PathProgramCache]: Analyzing trace with hash -1152559611, now seen corresponding path program 1 times [2022-11-20 20:14:45,851 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 20:14:45,851 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1703696873] [2022-11-20 20:14:45,851 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:14:45,852 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 20:14:46,120 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:14:48,112 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:14:48,113 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 20:14:48,114 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1703696873] [2022-11-20 20:14:48,115 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1703696873] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 20:14:48,115 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 20:14:48,116 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-20 20:14:48,118 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1068277263] [2022-11-20 20:14:48,118 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 20:14:48,123 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-20 20:14:48,124 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 20:14:48,168 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-20 20:14:48,169 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-11-20 20:14:48,171 INFO L87 Difference]: Start difference. First operand has 19 states, 17 states have (on average 1.7647058823529411) internal successors, (30), 18 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) Second operand has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:14:48,335 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:14:48,335 INFO L93 Difference]: Finished difference Result 54 states and 90 transitions. [2022-11-20 20:14:48,336 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-20 20:14:48,338 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 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 6 [2022-11-20 20:14:48,339 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:14:48,347 INFO L225 Difference]: With dead ends: 54 [2022-11-20 20:14:48,347 INFO L226 Difference]: Without dead ends: 36 [2022-11-20 20:14:48,350 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-11-20 20:14:48,355 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 24 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 44 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 38 SdHoareTripleChecker+Invalid, 46 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 44 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-20 20:14:48,356 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [24 Valid, 38 Invalid, 46 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 44 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-20 20:14:48,375 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2022-11-20 20:14:48,393 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 27. [2022-11-20 20:14:48,396 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 26 states have (on average 1.6538461538461537) internal successors, (43), 26 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:14:48,398 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 43 transitions. [2022-11-20 20:14:48,400 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 43 transitions. Word has length 6 [2022-11-20 20:14:48,401 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:14:48,401 INFO L495 AbstractCegarLoop]: Abstraction has 27 states and 43 transitions. [2022-11-20 20:14:48,402 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:14:48,402 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 43 transitions. [2022-11-20 20:14:48,402 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2022-11-20 20:14:48,403 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:14:48,403 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:14:48,404 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-11-20 20:14:48,404 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 20:14:48,405 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:14:48,405 INFO L85 PathProgramCache]: Analyzing trace with hash -1432244128, now seen corresponding path program 1 times [2022-11-20 20:14:48,406 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 20:14:48,406 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1159792337] [2022-11-20 20:14:48,406 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:14:48,406 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 20:14:48,455 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:14:49,297 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:14:49,299 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 20:14:49,299 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1159792337] [2022-11-20 20:14:49,300 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1159792337] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 20:14:49,300 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 20:14:49,300 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-20 20:14:49,300 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [859716351] [2022-11-20 20:14:49,301 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 20:14:49,302 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-20 20:14:49,303 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 20:14:49,303 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-20 20:14:49,303 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-11-20 20:14:49,304 INFO L87 Difference]: Start difference. First operand 27 states and 43 transitions. Second operand has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:14:49,418 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:14:49,419 INFO L93 Difference]: Finished difference Result 53 states and 81 transitions. [2022-11-20 20:14:49,419 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-20 20:14:49,419 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2022-11-20 20:14:49,420 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:14:49,421 INFO L225 Difference]: With dead ends: 53 [2022-11-20 20:14:49,421 INFO L226 Difference]: Without dead ends: 36 [2022-11-20 20:14:49,426 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-11-20 20:14:49,429 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 22 mSDsluCounter, 28 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 45 SdHoareTripleChecker+Invalid, 35 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-20 20:14:49,429 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [22 Valid, 45 Invalid, 35 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 34 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-20 20:14:49,432 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2022-11-20 20:14:49,441 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 27. [2022-11-20 20:14:49,442 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 26 states have (on average 1.6153846153846154) internal successors, (42), 26 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:14:49,444 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 42 transitions. [2022-11-20 20:14:49,447 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 42 transitions. Word has length 7 [2022-11-20 20:14:49,448 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:14:49,448 INFO L495 AbstractCegarLoop]: Abstraction has 27 states and 42 transitions. [2022-11-20 20:14:49,448 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:14:49,448 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 42 transitions. [2022-11-20 20:14:49,450 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2022-11-20 20:14:49,451 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:14:49,451 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:14:49,451 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-11-20 20:14:49,456 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 20:14:49,456 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:14:49,461 INFO L85 PathProgramCache]: Analyzing trace with hash -1507077810, now seen corresponding path program 1 times [2022-11-20 20:14:49,461 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 20:14:49,462 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1641777039] [2022-11-20 20:14:49,462 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:14:49,462 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 20:14:49,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:14:50,403 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:14:50,403 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 20:14:50,404 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1641777039] [2022-11-20 20:14:50,404 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1641777039] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 20:14:50,405 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 20:14:50,405 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-20 20:14:50,405 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [87787804] [2022-11-20 20:14:50,405 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 20:14:50,406 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-20 20:14:50,406 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 20:14:50,407 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-20 20:14:50,407 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-11-20 20:14:50,408 INFO L87 Difference]: Start difference. First operand 27 states and 42 transitions. Second operand has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:14:50,521 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:14:50,521 INFO L93 Difference]: Finished difference Result 53 states and 80 transitions. [2022-11-20 20:14:50,522 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-20 20:14:50,522 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 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 8 [2022-11-20 20:14:50,522 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:14:50,524 INFO L225 Difference]: With dead ends: 53 [2022-11-20 20:14:50,524 INFO L226 Difference]: Without dead ends: 36 [2022-11-20 20:14:50,525 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-11-20 20:14:50,528 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 20 mSDsluCounter, 28 mSDsCounter, 0 mSdLazyCounter, 37 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 45 SdHoareTripleChecker+Invalid, 38 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 37 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-20 20:14:50,532 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [20 Valid, 45 Invalid, 38 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 37 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-20 20:14:50,533 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2022-11-20 20:14:50,537 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 27. [2022-11-20 20:14:50,538 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 26 states have (on average 1.5769230769230769) internal successors, (41), 26 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:14:50,539 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 41 transitions. [2022-11-20 20:14:50,540 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 41 transitions. Word has length 8 [2022-11-20 20:14:50,540 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:14:50,541 INFO L495 AbstractCegarLoop]: Abstraction has 27 states and 41 transitions. [2022-11-20 20:14:50,541 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:14:50,541 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 41 transitions. [2022-11-20 20:14:50,541 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-11-20 20:14:50,542 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:14:50,542 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:14:50,542 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-11-20 20:14:50,543 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 20:14:50,543 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:14:50,544 INFO L85 PathProgramCache]: Analyzing trace with hash 473497097, now seen corresponding path program 1 times [2022-11-20 20:14:50,544 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 20:14:50,544 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1355428523] [2022-11-20 20:14:50,544 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:14:50,545 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 20:14:50,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:14:51,404 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:14:51,404 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 20:14:51,404 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1355428523] [2022-11-20 20:14:51,404 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1355428523] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 20:14:51,405 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 20:14:51,405 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-20 20:14:51,405 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [507055250] [2022-11-20 20:14:51,405 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 20:14:51,405 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-20 20:14:51,406 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 20:14:51,406 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-20 20:14:51,406 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-11-20 20:14:51,408 INFO L87 Difference]: Start difference. First operand 27 states and 41 transitions. Second operand has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:14:51,509 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:14:51,510 INFO L93 Difference]: Finished difference Result 53 states and 79 transitions. [2022-11-20 20:14:51,510 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-20 20:14:51,510 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2022-11-20 20:14:51,510 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:14:51,513 INFO L225 Difference]: With dead ends: 53 [2022-11-20 20:14:51,513 INFO L226 Difference]: Without dead ends: 36 [2022-11-20 20:14:51,514 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-11-20 20:14:51,521 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 18 mSDsluCounter, 26 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 43 SdHoareTripleChecker+Invalid, 35 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-20 20:14:51,523 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [18 Valid, 43 Invalid, 35 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 34 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-20 20:14:51,525 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2022-11-20 20:14:51,531 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 27. [2022-11-20 20:14:51,532 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 26 states have (on average 1.5384615384615385) internal successors, (40), 26 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:14:51,534 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 40 transitions. [2022-11-20 20:14:51,535 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 40 transitions. Word has length 9 [2022-11-20 20:14:51,535 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:14:51,535 INFO L495 AbstractCegarLoop]: Abstraction has 27 states and 40 transitions. [2022-11-20 20:14:51,535 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:14:51,535 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 40 transitions. [2022-11-20 20:14:51,536 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-11-20 20:14:51,536 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:14:51,536 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:14:51,536 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2022-11-20 20:14:51,537 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 20:14:51,537 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:14:51,537 INFO L85 PathProgramCache]: Analyzing trace with hash -1709372463, now seen corresponding path program 1 times [2022-11-20 20:14:51,537 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 20:14:51,538 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [259908385] [2022-11-20 20:14:51,538 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:14:51,539 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 20:14:51,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:14:52,695 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:14:52,695 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 20:14:52,695 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [259908385] [2022-11-20 20:14:52,696 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [259908385] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 20:14:52,696 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 20:14:52,696 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-20 20:14:52,696 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [154227123] [2022-11-20 20:14:52,696 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 20:14:52,697 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-20 20:14:52,697 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 20:14:52,697 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-20 20:14:52,697 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-11-20 20:14:52,697 INFO L87 Difference]: Start difference. First operand 27 states and 40 transitions. Second operand has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:14:52,808 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:14:52,808 INFO L93 Difference]: Finished difference Result 53 states and 78 transitions. [2022-11-20 20:14:52,809 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-20 20:14:52,809 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2022-11-20 20:14:52,809 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:14:52,811 INFO L225 Difference]: With dead ends: 53 [2022-11-20 20:14:52,811 INFO L226 Difference]: Without dead ends: 36 [2022-11-20 20:14:52,812 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-11-20 20:14:52,813 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 15 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 40 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 42 SdHoareTripleChecker+Invalid, 41 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 40 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-20 20:14:52,815 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [15 Valid, 42 Invalid, 41 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 40 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-20 20:14:52,816 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2022-11-20 20:14:52,819 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 27. [2022-11-20 20:14:52,820 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 26 states have (on average 1.5) internal successors, (39), 26 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:14:52,820 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 39 transitions. [2022-11-20 20:14:52,820 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 39 transitions. Word has length 11 [2022-11-20 20:14:52,820 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:14:52,820 INFO L495 AbstractCegarLoop]: Abstraction has 27 states and 39 transitions. [2022-11-20 20:14:52,821 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:14:52,821 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 39 transitions. [2022-11-20 20:14:52,821 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2022-11-20 20:14:52,821 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:14:52,821 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:14:52,821 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2022-11-20 20:14:52,822 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 20:14:52,822 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:14:52,822 INFO L85 PathProgramCache]: Analyzing trace with hash -1538865915, now seen corresponding path program 1 times [2022-11-20 20:14:52,825 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 20:14:52,826 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [255252320] [2022-11-20 20:14:52,826 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:14:52,826 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 20:14:52,914 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:14:53,662 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:14:53,662 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 20:14:53,662 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [255252320] [2022-11-20 20:14:53,662 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [255252320] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 20:14:53,663 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 20:14:53,663 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-20 20:14:53,663 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1319246481] [2022-11-20 20:14:53,663 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 20:14:53,664 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-20 20:14:53,664 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 20:14:53,664 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-20 20:14:53,664 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-11-20 20:14:53,664 INFO L87 Difference]: Start difference. First operand 27 states and 39 transitions. Second operand has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:14:53,741 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:14:53,742 INFO L93 Difference]: Finished difference Result 54 states and 79 transitions. [2022-11-20 20:14:53,742 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-20 20:14:53,742 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 0 states have call successors, (0), 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 12 [2022-11-20 20:14:53,743 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:14:53,743 INFO L225 Difference]: With dead ends: 54 [2022-11-20 20:14:53,743 INFO L226 Difference]: Without dead ends: 35 [2022-11-20 20:14:53,744 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-11-20 20:14:53,744 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 12 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 25 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 57 SdHoareTripleChecker+Invalid, 28 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 25 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-20 20:14:53,745 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 57 Invalid, 28 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 25 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-20 20:14:53,745 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2022-11-20 20:14:53,749 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 27. [2022-11-20 20:14:53,749 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 26 states have (on average 1.4230769230769231) internal successors, (37), 26 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:14:53,750 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 37 transitions. [2022-11-20 20:14:53,750 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 37 transitions. Word has length 12 [2022-11-20 20:14:53,750 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:14:53,750 INFO L495 AbstractCegarLoop]: Abstraction has 27 states and 37 transitions. [2022-11-20 20:14:53,751 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:14:53,751 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 37 transitions. [2022-11-20 20:14:53,751 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-11-20 20:14:53,751 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:14:53,751 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:14:53,752 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2022-11-20 20:14:53,752 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 20:14:53,752 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:14:53,752 INFO L85 PathProgramCache]: Analyzing trace with hash 132391435, now seen corresponding path program 1 times [2022-11-20 20:14:53,753 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 20:14:53,753 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [437732048] [2022-11-20 20:14:53,753 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:14:53,753 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 20:14:53,778 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:14:54,671 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:14:54,672 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 20:14:54,672 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [437732048] [2022-11-20 20:14:54,672 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [437732048] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 20:14:54,672 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 20:14:54,672 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-20 20:14:54,673 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [596440608] [2022-11-20 20:14:54,673 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 20:14:54,673 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-20 20:14:54,673 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 20:14:54,674 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-20 20:14:54,674 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-11-20 20:14:54,674 INFO L87 Difference]: Start difference. First operand 27 states and 37 transitions. Second operand has 4 states, 4 states have (on average 3.5) internal successors, (14), 3 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:14:54,754 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:14:54,755 INFO L93 Difference]: Finished difference Result 52 states and 73 transitions. [2022-11-20 20:14:54,755 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-20 20:14:54,755 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.5) internal successors, (14), 3 states have internal predecessors, (14), 0 states have call successors, (0), 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 14 [2022-11-20 20:14:54,756 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:14:54,756 INFO L225 Difference]: With dead ends: 52 [2022-11-20 20:14:54,756 INFO L226 Difference]: Without dead ends: 35 [2022-11-20 20:14:54,756 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-11-20 20:14:54,757 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 7 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 30 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 52 SdHoareTripleChecker+Invalid, 31 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 30 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-20 20:14:54,757 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 52 Invalid, 31 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 30 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-20 20:14:54,758 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2022-11-20 20:14:54,761 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 28. [2022-11-20 20:14:54,761 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 27 states have (on average 1.4074074074074074) internal successors, (38), 27 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) [2022-11-20 20:14:54,762 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 38 transitions. [2022-11-20 20:14:54,762 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 38 transitions. Word has length 14 [2022-11-20 20:14:54,762 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:14:54,763 INFO L495 AbstractCegarLoop]: Abstraction has 28 states and 38 transitions. [2022-11-20 20:14:54,763 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.5) internal successors, (14), 3 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:14:54,763 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 38 transitions. [2022-11-20 20:14:54,763 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-11-20 20:14:54,764 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:14:54,764 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:14:54,764 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2022-11-20 20:14:54,764 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 20:14:54,765 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:14:54,765 INFO L85 PathProgramCache]: Analyzing trace with hash -201720399, now seen corresponding path program 1 times [2022-11-20 20:14:54,765 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 20:14:54,765 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [60206147] [2022-11-20 20:14:54,765 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:14:54,765 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 20:14:54,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:14:55,603 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:14:55,603 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 20:14:55,603 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [60206147] [2022-11-20 20:14:55,604 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [60206147] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 20:14:55,604 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 20:14:55,604 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-20 20:14:55,604 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1263794289] [2022-11-20 20:14:55,604 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 20:14:55,605 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-20 20:14:55,606 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 20:14:55,606 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-20 20:14:55,606 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-20 20:14:55,606 INFO L87 Difference]: Start difference. First operand 28 states and 38 transitions. Second operand has 5 states, 5 states have (on average 3.0) internal successors, (15), 5 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:14:55,775 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:14:55,775 INFO L93 Difference]: Finished difference Result 75 states and 110 transitions. [2022-11-20 20:14:55,775 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-20 20:14:55,775 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 5 states have internal predecessors, (15), 0 states have call successors, (0), 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 15 [2022-11-20 20:14:55,776 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:14:55,776 INFO L225 Difference]: With dead ends: 75 [2022-11-20 20:14:55,776 INFO L226 Difference]: Without dead ends: 58 [2022-11-20 20:14:55,777 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2022-11-20 20:14:55,777 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 43 mSDsluCounter, 67 mSDsCounter, 0 mSdLazyCounter, 49 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 43 SdHoareTripleChecker+Valid, 98 SdHoareTripleChecker+Invalid, 58 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 49 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-20 20:14:55,777 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [43 Valid, 98 Invalid, 58 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 49 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-20 20:14:55,778 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2022-11-20 20:14:55,782 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 33. [2022-11-20 20:14:55,783 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 32 states have (on average 1.34375) internal successors, (43), 32 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:14:55,784 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 43 transitions. [2022-11-20 20:14:55,784 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 43 transitions. Word has length 15 [2022-11-20 20:14:55,784 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:14:55,785 INFO L495 AbstractCegarLoop]: Abstraction has 33 states and 43 transitions. [2022-11-20 20:14:55,785 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 5 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:14:55,785 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 43 transitions. [2022-11-20 20:14:55,786 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-11-20 20:14:55,786 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:14:55,786 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:14:55,786 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2022-11-20 20:14:55,786 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 20:14:55,787 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:14:55,787 INFO L85 PathProgramCache]: Analyzing trace with hash -962214667, now seen corresponding path program 1 times [2022-11-20 20:14:55,787 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 20:14:55,787 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1142181725] [2022-11-20 20:14:55,787 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:14:55,788 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 20:14:56,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:14:58,773 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:14:58,774 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 20:14:58,774 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1142181725] [2022-11-20 20:14:58,774 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1142181725] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 20:14:58,774 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1101606740] [2022-11-20 20:14:58,774 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:14:58,775 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:14:58,775 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07a939e3-8c3f-473e-9bde-60d99d93cf06/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:14:58,781 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07a939e3-8c3f-473e-9bde-60d99d93cf06/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 20:14:58,802 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07a939e3-8c3f-473e-9bde-60d99d93cf06/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-20 20:14:58,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:14:58,978 INFO L263 TraceCheckSpWp]: Trace formula consists of 207 conjuncts, 26 conjunts are in the unsatisfiable core [2022-11-20 20:14:58,998 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:15:18,535 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:15:18,535 INFO L328 TraceCheckSpWp]: Computing backward predicates...