./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/seq-mthreaded/pals_floodmax.3.3.ufo.UNBOUNDED.pals.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version e04fb08f Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_76e7f590-2396-40ba-86b5-1a9274c2df2f/bin/utaipan-Xvt2sAort0/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_76e7f590-2396-40ba-86b5-1a9274c2df2f/bin/utaipan-Xvt2sAort0/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_76e7f590-2396-40ba-86b5-1a9274c2df2f/bin/utaipan-Xvt2sAort0/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_76e7f590-2396-40ba-86b5-1a9274c2df2f/bin/utaipan-Xvt2sAort0/config/TaipanReach.xml -i ../../sv-benchmarks/c/seq-mthreaded/pals_floodmax.3.3.ufo.UNBOUNDED.pals.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_76e7f590-2396-40ba-86b5-1a9274c2df2f/bin/utaipan-Xvt2sAort0/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_76e7f590-2396-40ba-86b5-1a9274c2df2f/bin/utaipan-Xvt2sAort0 --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 b7a355896b8b65b5a2cb80c69f28000f566073d33b0003da7d28a637c6d5db6a --- 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-e04fb08 [2022-11-16 20:20:01,591 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-16 20:20:01,593 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-16 20:20:01,617 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-16 20:20:01,618 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-16 20:20:01,619 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-16 20:20:01,621 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-16 20:20:01,623 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-16 20:20:01,625 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-16 20:20:01,626 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-16 20:20:01,627 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-16 20:20:01,628 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-16 20:20:01,629 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-16 20:20:01,630 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-16 20:20:01,632 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-16 20:20:01,633 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-16 20:20:01,635 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-16 20:20:01,636 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-16 20:20:01,638 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-16 20:20:01,640 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-16 20:20:01,642 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-16 20:20:01,644 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-16 20:20:01,645 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-16 20:20:01,647 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-16 20:20:01,651 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-16 20:20:01,651 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-16 20:20:01,652 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-16 20:20:01,653 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-16 20:20:01,654 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-16 20:20:01,655 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-16 20:20:01,655 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-16 20:20:01,656 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-16 20:20:01,658 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-16 20:20:01,659 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-16 20:20:01,660 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-16 20:20:01,661 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-16 20:20:01,662 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-16 20:20:01,662 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-16 20:20:01,663 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-16 20:20:01,664 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-16 20:20:01,665 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-16 20:20:01,666 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_76e7f590-2396-40ba-86b5-1a9274c2df2f/bin/utaipan-Xvt2sAort0/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-16 20:20:01,692 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-16 20:20:01,692 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-16 20:20:01,693 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-16 20:20:01,693 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-16 20:20:01,694 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-16 20:20:01,695 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-16 20:20:01,695 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-16 20:20:01,695 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-16 20:20:01,696 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-16 20:20:01,696 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-16 20:20:01,697 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-16 20:20:01,697 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-16 20:20:01,697 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-16 20:20:01,698 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-16 20:20:01,698 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-16 20:20:01,698 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-16 20:20:01,699 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-16 20:20:01,699 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-16 20:20:01,700 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-16 20:20:01,701 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-16 20:20:01,701 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-16 20:20:01,701 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-16 20:20:01,702 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-16 20:20:01,702 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-16 20:20:01,703 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-16 20:20:01,703 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-16 20:20:01,703 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-16 20:20:01,704 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-16 20:20:01,704 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-16 20:20:01,705 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-16 20:20:01,705 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-16 20:20:01,705 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-16 20:20:01,706 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-16 20:20:01,706 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-16 20:20:01,707 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-16 20:20:01,707 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-16 20:20:01,707 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-16 20:20:01,708 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-16 20:20:01,708 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-16 20:20:01,708 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-16 20:20:01,709 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-16 20:20:01,709 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_76e7f590-2396-40ba-86b5-1a9274c2df2f/bin/utaipan-Xvt2sAort0/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_76e7f590-2396-40ba-86b5-1a9274c2df2f/bin/utaipan-Xvt2sAort0 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> b7a355896b8b65b5a2cb80c69f28000f566073d33b0003da7d28a637c6d5db6a [2022-11-16 20:20:02,062 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-16 20:20:02,098 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-16 20:20:02,102 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-16 20:20:02,104 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-16 20:20:02,105 INFO L275 PluginConnector]: CDTParser initialized [2022-11-16 20:20:02,106 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_76e7f590-2396-40ba-86b5-1a9274c2df2f/bin/utaipan-Xvt2sAort0/../../sv-benchmarks/c/seq-mthreaded/pals_floodmax.3.3.ufo.UNBOUNDED.pals.c [2022-11-16 20:20:02,192 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_76e7f590-2396-40ba-86b5-1a9274c2df2f/bin/utaipan-Xvt2sAort0/data/62784e080/bdc6e849420e4ee380740a7bc95af63f/FLAGf56b2bd09 [2022-11-16 20:20:02,749 INFO L306 CDTParser]: Found 1 translation units. [2022-11-16 20:20:02,750 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_76e7f590-2396-40ba-86b5-1a9274c2df2f/sv-benchmarks/c/seq-mthreaded/pals_floodmax.3.3.ufo.UNBOUNDED.pals.c [2022-11-16 20:20:02,763 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_76e7f590-2396-40ba-86b5-1a9274c2df2f/bin/utaipan-Xvt2sAort0/data/62784e080/bdc6e849420e4ee380740a7bc95af63f/FLAGf56b2bd09 [2022-11-16 20:20:03,084 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_76e7f590-2396-40ba-86b5-1a9274c2df2f/bin/utaipan-Xvt2sAort0/data/62784e080/bdc6e849420e4ee380740a7bc95af63f [2022-11-16 20:20:03,087 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-16 20:20:03,089 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-16 20:20:03,091 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-16 20:20:03,091 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-16 20:20:03,101 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-16 20:20:03,102 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 16.11 08:20:03" (1/1) ... [2022-11-16 20:20:03,103 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@9cfa3bd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 08:20:03, skipping insertion in model container [2022-11-16 20:20:03,106 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 16.11 08:20:03" (1/1) ... [2022-11-16 20:20:03,115 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-16 20:20:03,182 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-16 20:20:03,435 WARN L229 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_76e7f590-2396-40ba-86b5-1a9274c2df2f/sv-benchmarks/c/seq-mthreaded/pals_floodmax.3.3.ufo.UNBOUNDED.pals.c[12968,12981] [2022-11-16 20:20:03,438 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-16 20:20:03,450 INFO L203 MainTranslator]: Completed pre-run [2022-11-16 20:20:03,518 WARN L229 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_76e7f590-2396-40ba-86b5-1a9274c2df2f/sv-benchmarks/c/seq-mthreaded/pals_floodmax.3.3.ufo.UNBOUNDED.pals.c[12968,12981] [2022-11-16 20:20:03,519 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-16 20:20:03,535 INFO L208 MainTranslator]: Completed translation [2022-11-16 20:20:03,536 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 08:20:03 WrapperNode [2022-11-16 20:20:03,536 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-16 20:20:03,537 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-16 20:20:03,538 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-16 20:20:03,538 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-16 20:20:03,552 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 08:20:03" (1/1) ... [2022-11-16 20:20:03,561 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 08:20:03" (1/1) ... [2022-11-16 20:20:03,602 INFO L138 Inliner]: procedures = 23, calls = 14, calls flagged for inlining = 9, calls inlined = 9, statements flattened = 419 [2022-11-16 20:20:03,602 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-16 20:20:03,603 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-16 20:20:03,604 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-16 20:20:03,604 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-16 20:20:03,624 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 08:20:03" (1/1) ... [2022-11-16 20:20:03,624 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 08:20:03" (1/1) ... [2022-11-16 20:20:03,628 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 08:20:03" (1/1) ... [2022-11-16 20:20:03,629 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 08:20:03" (1/1) ... [2022-11-16 20:20:03,640 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 08:20:03" (1/1) ... [2022-11-16 20:20:03,650 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 08:20:03" (1/1) ... [2022-11-16 20:20:03,653 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 08:20:03" (1/1) ... [2022-11-16 20:20:03,655 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 08:20:03" (1/1) ... [2022-11-16 20:20:03,660 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-16 20:20:03,661 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-16 20:20:03,661 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-16 20:20:03,661 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-16 20:20:03,679 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 08:20:03" (1/1) ... [2022-11-16 20:20:03,687 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-16 20:20:03,699 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_76e7f590-2396-40ba-86b5-1a9274c2df2f/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:20:03,712 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_76e7f590-2396-40ba-86b5-1a9274c2df2f/bin/utaipan-Xvt2sAort0/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-16 20:20:03,714 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_76e7f590-2396-40ba-86b5-1a9274c2df2f/bin/utaipan-Xvt2sAort0/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-16 20:20:03,750 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-16 20:20:03,750 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-16 20:20:03,750 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-16 20:20:03,751 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-16 20:20:03,854 INFO L235 CfgBuilder]: Building ICFG [2022-11-16 20:20:03,856 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-16 20:20:04,657 INFO L276 CfgBuilder]: Performing block encoding [2022-11-16 20:20:05,472 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-16 20:20:05,472 INFO L300 CfgBuilder]: Removed 1 assume(true) statements. [2022-11-16 20:20:05,478 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 16.11 08:20:05 BoogieIcfgContainer [2022-11-16 20:20:05,478 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-16 20:20:05,483 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-16 20:20:05,483 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-16 20:20:05,487 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-16 20:20:05,487 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 16.11 08:20:03" (1/3) ... [2022-11-16 20:20:05,488 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@45633c70 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 16.11 08:20:05, skipping insertion in model container [2022-11-16 20:20:05,488 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 08:20:03" (2/3) ... [2022-11-16 20:20:05,489 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@45633c70 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 16.11 08:20:05, skipping insertion in model container [2022-11-16 20:20:05,489 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 16.11 08:20:05" (3/3) ... [2022-11-16 20:20:05,491 INFO L112 eAbstractionObserver]: Analyzing ICFG pals_floodmax.3.3.ufo.UNBOUNDED.pals.c [2022-11-16 20:20:05,512 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-16 20:20:05,513 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-16 20:20:05,600 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-16 20:20:05,613 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;@402bd47e, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-16 20:20:05,614 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-11-16 20:20:05,622 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) [2022-11-16 20:20:05,631 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2022-11-16 20:20:05,631 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:20:05,632 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2022-11-16 20:20:05,633 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 20:20:05,642 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:20:05,643 INFO L85 PathProgramCache]: Analyzing trace with hash -1744258554, now seen corresponding path program 1 times [2022-11-16 20:20:05,655 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:20:05,656 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [731847274] [2022-11-16 20:20:05,656 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:20:05,657 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:20:06,229 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:20:08,542 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:20:08,543 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:20:08,543 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [731847274] [2022-11-16 20:20:08,544 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [731847274] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-16 20:20:08,545 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-16 20:20:08,545 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-16 20:20:08,548 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1435876083] [2022-11-16 20:20:08,550 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-16 20:20:08,556 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-16 20:20:08,558 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:20:08,604 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-16 20:20:08,606 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-11-16 20:20:08,609 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) [2022-11-16 20:20:08,812 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:20:08,812 INFO L93 Difference]: Finished difference Result 54 states and 90 transitions. [2022-11-16 20:20:08,813 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-16 20:20:08,815 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 [2022-11-16 20:20:08,816 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:20:08,835 INFO L225 Difference]: With dead ends: 54 [2022-11-16 20:20:08,835 INFO L226 Difference]: Without dead ends: 36 [2022-11-16 20:20:08,839 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 [2022-11-16 20:20:08,845 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 24 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 43 mSolverCounterSat, 3 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, 3 IncrementalHoareTripleChecker+Valid, 43 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-16 20:20:08,846 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [24 Valid, 38 Invalid, 46 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 43 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-16 20:20:08,867 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2022-11-16 20:20:08,891 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 26. [2022-11-16 20:20:08,894 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 25 states have (on average 1.64) internal successors, (41), 25 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) [2022-11-16 20:20:08,896 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 41 transitions. [2022-11-16 20:20:08,898 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 41 transitions. Word has length 6 [2022-11-16 20:20:08,898 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:20:08,898 INFO L495 AbstractCegarLoop]: Abstraction has 26 states and 41 transitions. [2022-11-16 20:20:08,899 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) [2022-11-16 20:20:08,899 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 41 transitions. [2022-11-16 20:20:08,900 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2022-11-16 20:20:08,900 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:20:08,901 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2022-11-16 20:20:08,901 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-11-16 20:20:08,902 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 20:20:08,902 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:20:08,903 INFO L85 PathProgramCache]: Analyzing trace with hash 1699896268, now seen corresponding path program 1 times [2022-11-16 20:20:08,903 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:20:08,903 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [475357321] [2022-11-16 20:20:08,903 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:20:08,904 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:20:09,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:20:10,529 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:20:10,530 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:20:10,531 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [475357321] [2022-11-16 20:20:10,531 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [475357321] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-16 20:20:10,532 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-16 20:20:10,532 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-16 20:20:10,532 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1188222142] [2022-11-16 20:20:10,533 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-16 20:20:10,535 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-16 20:20:10,535 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:20:10,536 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-16 20:20:10,536 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-11-16 20:20:10,537 INFO L87 Difference]: Start difference. First operand 26 states and 41 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) [2022-11-16 20:20:10,667 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:20:10,667 INFO L93 Difference]: Finished difference Result 57 states and 87 transitions. [2022-11-16 20:20:10,668 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-16 20:20:10,668 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 [2022-11-16 20:20:10,668 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:20:10,669 INFO L225 Difference]: With dead ends: 57 [2022-11-16 20:20:10,670 INFO L226 Difference]: Without dead ends: 38 [2022-11-16 20:20:10,675 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 [2022-11-16 20:20:10,677 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 22 mSDsluCounter, 28 mSDsCounter, 0 mSdLazyCounter, 37 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 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 [2022-11-16 20:20:10,677 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [22 Valid, 45 Invalid, 38 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 37 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-16 20:20:10,681 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2022-11-16 20:20:10,691 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 26. [2022-11-16 20:20:10,692 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 25 states have (on average 1.6) internal successors, (40), 25 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) [2022-11-16 20:20:10,695 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 40 transitions. [2022-11-16 20:20:10,698 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 40 transitions. Word has length 7 [2022-11-16 20:20:10,698 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:20:10,699 INFO L495 AbstractCegarLoop]: Abstraction has 26 states and 40 transitions. [2022-11-16 20:20:10,699 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) [2022-11-16 20:20:10,699 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 40 transitions. [2022-11-16 20:20:10,700 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2022-11-16 20:20:10,701 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:20:10,701 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 20:20:10,701 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-11-16 20:20:10,701 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 20:20:10,702 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:20:10,702 INFO L85 PathProgramCache]: Analyzing trace with hash 1099965103, now seen corresponding path program 1 times [2022-11-16 20:20:10,702 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:20:10,703 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [453674926] [2022-11-16 20:20:10,703 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:20:10,703 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:20:10,831 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:20:12,070 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:20:12,071 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:20:12,072 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [453674926] [2022-11-16 20:20:12,072 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [453674926] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-16 20:20:12,073 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-16 20:20:12,073 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-16 20:20:12,074 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [698010049] [2022-11-16 20:20:12,074 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-16 20:20:12,074 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-16 20:20:12,075 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:20:12,076 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-16 20:20:12,076 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-11-16 20:20:12,077 INFO L87 Difference]: Start difference. First operand 26 states and 40 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) [2022-11-16 20:20:12,212 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:20:12,212 INFO L93 Difference]: Finished difference Result 57 states and 86 transitions. [2022-11-16 20:20:12,212 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-16 20:20:12,213 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 [2022-11-16 20:20:12,213 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:20:12,214 INFO L225 Difference]: With dead ends: 57 [2022-11-16 20:20:12,214 INFO L226 Difference]: Without dead ends: 38 [2022-11-16 20:20:12,214 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 [2022-11-16 20:20:12,215 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 20 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 44 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 [2022-11-16 20:20:12,216 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [20 Valid, 44 Invalid, 35 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 34 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-16 20:20:12,217 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2022-11-16 20:20:12,225 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 26. [2022-11-16 20:20:12,226 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 25 states have (on average 1.56) internal successors, (39), 25 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) [2022-11-16 20:20:12,227 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 39 transitions. [2022-11-16 20:20:12,228 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 39 transitions. Word has length 8 [2022-11-16 20:20:12,228 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:20:12,228 INFO L495 AbstractCegarLoop]: Abstraction has 26 states and 39 transitions. [2022-11-16 20:20:12,229 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) [2022-11-16 20:20:12,229 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 39 transitions. [2022-11-16 20:20:12,230 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-11-16 20:20:12,230 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:20:12,230 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 20:20:12,231 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-11-16 20:20:12,231 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 20:20:12,233 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:20:12,233 INFO L85 PathProgramCache]: Analyzing trace with hash -312580075, now seen corresponding path program 1 times [2022-11-16 20:20:12,234 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:20:12,234 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [337177007] [2022-11-16 20:20:12,234 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:20:12,235 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:20:12,439 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:20:13,580 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:20:13,580 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:20:13,581 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [337177007] [2022-11-16 20:20:13,581 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [337177007] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-16 20:20:13,581 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-16 20:20:13,582 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-16 20:20:13,582 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [614516773] [2022-11-16 20:20:13,583 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-16 20:20:13,583 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-16 20:20:13,584 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:20:13,585 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-16 20:20:13,585 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-11-16 20:20:13,587 INFO L87 Difference]: Start difference. First operand 26 states and 39 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) [2022-11-16 20:20:13,732 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:20:13,732 INFO L93 Difference]: Finished difference Result 57 states and 85 transitions. [2022-11-16 20:20:13,733 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-16 20:20:13,733 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 [2022-11-16 20:20:13,733 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:20:13,736 INFO L225 Difference]: With dead ends: 57 [2022-11-16 20:20:13,737 INFO L226 Difference]: Without dead ends: 38 [2022-11-16 20:20:13,737 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 [2022-11-16 20:20:13,748 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 18 mSDsluCounter, 28 mSDsCounter, 0 mSdLazyCounter, 37 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 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 [2022-11-16 20:20:13,749 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [18 Valid, 45 Invalid, 38 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 37 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-16 20:20:13,750 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2022-11-16 20:20:13,756 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 26. [2022-11-16 20:20:13,756 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 25 states have (on average 1.52) internal successors, (38), 25 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) [2022-11-16 20:20:13,757 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 38 transitions. [2022-11-16 20:20:13,758 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 38 transitions. Word has length 9 [2022-11-16 20:20:13,758 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:20:13,759 INFO L495 AbstractCegarLoop]: Abstraction has 26 states and 38 transitions. [2022-11-16 20:20:13,759 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) [2022-11-16 20:20:13,759 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 38 transitions. [2022-11-16 20:20:13,760 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-11-16 20:20:13,760 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:20:13,760 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 20:20:13,761 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2022-11-16 20:20:13,761 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 20:20:13,761 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:20:13,762 INFO L85 PathProgramCache]: Analyzing trace with hash -1216213891, now seen corresponding path program 1 times [2022-11-16 20:20:13,762 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:20:13,762 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1761524626] [2022-11-16 20:20:13,762 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:20:13,763 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:20:13,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:20:15,385 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:20:15,385 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:20:15,386 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1761524626] [2022-11-16 20:20:15,386 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1761524626] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-16 20:20:15,386 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-16 20:20:15,386 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-16 20:20:15,388 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1273897612] [2022-11-16 20:20:15,388 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-16 20:20:15,389 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-16 20:20:15,389 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:20:15,390 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-16 20:20:15,390 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-11-16 20:20:15,390 INFO L87 Difference]: Start difference. First operand 26 states and 38 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) [2022-11-16 20:20:15,531 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:20:15,531 INFO L93 Difference]: Finished difference Result 55 states and 81 transitions. [2022-11-16 20:20:15,532 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-16 20:20:15,532 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 [2022-11-16 20:20:15,533 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:20:15,533 INFO L225 Difference]: With dead ends: 55 [2022-11-16 20:20:15,533 INFO L226 Difference]: Without dead ends: 36 [2022-11-16 20:20:15,534 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 [2022-11-16 20:20:15,535 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 15 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 39 mSolverCounterSat, 2 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, 2 IncrementalHoareTripleChecker+Valid, 39 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-16 20:20:15,535 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [15 Valid, 42 Invalid, 41 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 39 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-16 20:20:15,536 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2022-11-16 20:20:15,542 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 27. [2022-11-16 20:20:15,543 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) [2022-11-16 20:20:15,544 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 39 transitions. [2022-11-16 20:20:15,544 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 39 transitions. Word has length 11 [2022-11-16 20:20:15,545 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:20:15,546 INFO L495 AbstractCegarLoop]: Abstraction has 27 states and 39 transitions. [2022-11-16 20:20:15,546 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) [2022-11-16 20:20:15,546 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 39 transitions. [2022-11-16 20:20:15,552 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2022-11-16 20:20:15,552 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:20:15,553 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 20:20:15,553 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2022-11-16 20:20:15,553 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 20:20:15,554 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:20:15,554 INFO L85 PathProgramCache]: Analyzing trace with hash 864119078, now seen corresponding path program 1 times [2022-11-16 20:20:15,554 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:20:15,555 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1412138703] [2022-11-16 20:20:15,556 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:20:15,556 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:20:15,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:20:16,794 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:20:16,794 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:20:16,795 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1412138703] [2022-11-16 20:20:16,795 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1412138703] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-16 20:20:16,795 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-16 20:20:16,795 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-16 20:20:16,796 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [342958380] [2022-11-16 20:20:16,796 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-16 20:20:16,797 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-16 20:20:16,797 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:20:16,797 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-16 20:20:16,798 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-11-16 20:20:16,798 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) [2022-11-16 20:20:16,884 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:20:16,884 INFO L93 Difference]: Finished difference Result 56 states and 82 transitions. [2022-11-16 20:20:16,884 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-16 20:20:16,885 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 [2022-11-16 20:20:16,885 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:20:16,887 INFO L225 Difference]: With dead ends: 56 [2022-11-16 20:20:16,888 INFO L226 Difference]: Without dead ends: 37 [2022-11-16 20:20:16,888 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 [2022-11-16 20:20:16,891 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 12 mSDsluCounter, 29 mSDsCounter, 0 mSdLazyCounter, 22 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 50 SdHoareTripleChecker+Invalid, 25 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 22 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-16 20:20:16,891 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 50 Invalid, 25 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 22 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-16 20:20:16,892 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2022-11-16 20:20:16,908 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 29. [2022-11-16 20:20:16,909 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 28 states have (on average 1.4285714285714286) internal successors, (40), 28 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) [2022-11-16 20:20:16,910 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 40 transitions. [2022-11-16 20:20:16,910 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 40 transitions. Word has length 12 [2022-11-16 20:20:16,910 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:20:16,910 INFO L495 AbstractCegarLoop]: Abstraction has 29 states and 40 transitions. [2022-11-16 20:20:16,911 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) [2022-11-16 20:20:16,911 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 40 transitions. [2022-11-16 20:20:16,911 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-11-16 20:20:16,911 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:20:16,912 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 20:20:16,912 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2022-11-16 20:20:16,912 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 20:20:16,913 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:20:16,913 INFO L85 PathProgramCache]: Analyzing trace with hash -1292358772, now seen corresponding path program 1 times [2022-11-16 20:20:16,913 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:20:16,913 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [254926467] [2022-11-16 20:20:16,914 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:20:16,914 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:20:17,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:20:18,222 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:20:18,225 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:20:18,225 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [254926467] [2022-11-16 20:20:18,226 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [254926467] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-16 20:20:18,226 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-16 20:20:18,226 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-16 20:20:18,226 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1275056813] [2022-11-16 20:20:18,227 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-16 20:20:18,227 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-16 20:20:18,227 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:20:18,229 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-16 20:20:18,229 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-11-16 20:20:18,229 INFO L87 Difference]: Start difference. First operand 29 states and 40 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) [2022-11-16 20:20:18,336 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:20:18,336 INFO L93 Difference]: Finished difference Result 56 states and 79 transitions. [2022-11-16 20:20:18,337 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-16 20:20:18,337 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 [2022-11-16 20:20:18,337 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:20:18,338 INFO L225 Difference]: With dead ends: 56 [2022-11-16 20:20:18,338 INFO L226 Difference]: Without dead ends: 37 [2022-11-16 20:20:18,339 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 [2022-11-16 20:20:18,340 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 7 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 29 mSolverCounterSat, 2 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, 2 IncrementalHoareTripleChecker+Valid, 29 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-16 20:20:18,340 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 52 Invalid, 31 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 29 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-16 20:20:18,343 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2022-11-16 20:20:18,356 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 30. [2022-11-16 20:20:18,356 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 29 states have (on average 1.4137931034482758) internal successors, (41), 29 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) [2022-11-16 20:20:18,361 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 41 transitions. [2022-11-16 20:20:18,362 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 41 transitions. Word has length 14 [2022-11-16 20:20:18,362 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:20:18,362 INFO L495 AbstractCegarLoop]: Abstraction has 30 states and 41 transitions. [2022-11-16 20:20:18,363 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) [2022-11-16 20:20:18,363 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 41 transitions. [2022-11-16 20:20:18,364 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-11-16 20:20:18,364 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:20:18,365 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 20:20:18,365 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2022-11-16 20:20:18,365 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 20:20:18,366 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:20:18,366 INFO L85 PathProgramCache]: Analyzing trace with hash -1420911630, now seen corresponding path program 1 times [2022-11-16 20:20:18,366 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:20:18,367 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [761492216] [2022-11-16 20:20:18,367 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:20:18,367 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:20:18,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:20:18,677 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:20:18,678 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:20:18,678 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [761492216] [2022-11-16 20:20:18,678 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [761492216] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-16 20:20:18,678 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-16 20:20:18,679 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-16 20:20:18,679 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1626685630] [2022-11-16 20:20:18,679 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-16 20:20:18,680 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-16 20:20:18,680 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:20:18,680 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-16 20:20:18,681 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-16 20:20:18,681 INFO L87 Difference]: Start difference. First operand 30 states and 41 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) [2022-11-16 20:20:18,872 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:20:18,872 INFO L93 Difference]: Finished difference Result 77 states and 113 transitions. [2022-11-16 20:20:18,872 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-16 20:20:18,873 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 [2022-11-16 20:20:18,873 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:20:18,873 INFO L225 Difference]: With dead ends: 77 [2022-11-16 20:20:18,874 INFO L226 Difference]: Without dead ends: 58 [2022-11-16 20:20:18,874 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 [2022-11-16 20:20:18,875 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 [2022-11-16 20:20:18,875 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] [2022-11-16 20:20:18,876 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2022-11-16 20:20:18,882 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 33. [2022-11-16 20:20:18,882 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) [2022-11-16 20:20:18,883 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 43 transitions. [2022-11-16 20:20:18,883 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 43 transitions. Word has length 15 [2022-11-16 20:20:18,883 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:20:18,884 INFO L495 AbstractCegarLoop]: Abstraction has 33 states and 43 transitions. [2022-11-16 20:20:18,884 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) [2022-11-16 20:20:18,884 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 43 transitions. [2022-11-16 20:20:18,885 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-11-16 20:20:18,885 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:20:18,885 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 20:20:18,885 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2022-11-16 20:20:18,886 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 20:20:18,886 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:20:18,886 INFO L85 PathProgramCache]: Analyzing trace with hash -1919525086, now seen corresponding path program 1 times [2022-11-16 20:20:18,887 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:20:18,887 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [669143765] [2022-11-16 20:20:18,887 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:20:18,887 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:20:19,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:20:21,921 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:20:21,922 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:20:21,922 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [669143765] [2022-11-16 20:20:21,922 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [669143765] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:20:21,923 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1648939109] [2022-11-16 20:20:21,923 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:20:21,923 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:20:21,923 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_76e7f590-2396-40ba-86b5-1a9274c2df2f/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:20:21,927 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_76e7f590-2396-40ba-86b5-1a9274c2df2f/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:20:21,946 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_76e7f590-2396-40ba-86b5-1a9274c2df2f/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-16 20:20:22,135 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:20:22,140 INFO L263 TraceCheckSpWp]: Trace formula consists of 207 conjuncts, 24 conjunts are in the unsatisfiable core [2022-11-16 20:20:22,162 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:20:40,733 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:20:40,733 INFO L328 TraceCheckSpWp]: Computing backward predicates...