./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 839c364b Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ab89d83-ae16-4cd7-8087-5697eef2eaa9/bin/utaipan-eEHZpOm5b7/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ab89d83-ae16-4cd7-8087-5697eef2eaa9/bin/utaipan-eEHZpOm5b7/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ab89d83-ae16-4cd7-8087-5697eef2eaa9/bin/utaipan-eEHZpOm5b7/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ab89d83-ae16-4cd7-8087-5697eef2eaa9/bin/utaipan-eEHZpOm5b7/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_1ab89d83-ae16-4cd7-8087-5697eef2eaa9/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ab89d83-ae16-4cd7-8087-5697eef2eaa9/bin/utaipan-eEHZpOm5b7 --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 --- This is Ultimate 0.2.2-hotfix-svcomp22-839c364 [2021-11-25 19:03:21,811 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-25 19:03:21,814 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-25 19:03:21,854 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-25 19:03:21,855 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-25 19:03:21,856 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-25 19:03:21,858 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-25 19:03:21,860 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-25 19:03:21,863 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-25 19:03:21,864 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-25 19:03:21,865 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-25 19:03:21,867 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-25 19:03:21,867 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-25 19:03:21,869 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-25 19:03:21,870 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-25 19:03:21,872 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-25 19:03:21,873 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-25 19:03:21,874 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-25 19:03:21,876 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-25 19:03:21,879 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-25 19:03:21,881 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-25 19:03:21,882 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-25 19:03:21,884 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-25 19:03:21,885 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-25 19:03:21,889 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-25 19:03:21,889 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-25 19:03:21,889 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-25 19:03:21,891 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-25 19:03:21,891 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-25 19:03:21,896 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-25 19:03:21,897 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-25 19:03:21,898 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-25 19:03:21,900 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-25 19:03:21,901 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-25 19:03:21,903 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-25 19:03:21,903 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-25 19:03:21,904 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-25 19:03:21,905 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-25 19:03:21,905 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-25 19:03:21,906 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-25 19:03:21,907 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-25 19:03:21,908 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ab89d83-ae16-4cd7-8087-5697eef2eaa9/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-25 19:03:21,947 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-25 19:03:21,951 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-25 19:03:21,952 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-25 19:03:21,952 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-25 19:03:21,959 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-25 19:03:21,959 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-25 19:03:21,960 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-25 19:03:21,960 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-25 19:03:21,960 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-25 19:03:21,960 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-25 19:03:21,961 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-25 19:03:21,961 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-25 19:03:21,962 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-25 19:03:21,962 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-25 19:03:21,962 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-25 19:03:21,962 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-25 19:03:21,963 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-25 19:03:21,963 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-25 19:03:21,964 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-25 19:03:21,964 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-25 19:03:21,964 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-25 19:03:21,964 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-25 19:03:21,964 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-25 19:03:21,965 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-25 19:03:21,965 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-25 19:03:21,965 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-25 19:03:21,967 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-25 19:03:21,967 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-25 19:03:21,967 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-25 19:03:21,967 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-25 19:03:21,968 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-25 19:03:21,968 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-25 19:03:21,968 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 19:03:21,968 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-25 19:03:21,969 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-25 19:03:21,969 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-25 19:03:21,969 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-25 19:03:21,969 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-25 19:03:21,969 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-25 19:03:21,970 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-25 19:03:21,970 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-25 19:03:21,970 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ab89d83-ae16-4cd7-8087-5697eef2eaa9/bin/utaipan-eEHZpOm5b7/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ab89d83-ae16-4cd7-8087-5697eef2eaa9/bin/utaipan-eEHZpOm5b7 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> a2c5c77b8d7714bea640ff99a5b0e1a19cf307340ccbaffec9b7e0efde04f6ec [2021-11-25 19:03:22,239 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-25 19:03:22,259 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-25 19:03:22,263 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-25 19:03:22,264 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-25 19:03:22,265 INFO L275 PluginConnector]: CDTParser initialized [2021-11-25 19:03:22,266 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ab89d83-ae16-4cd7-8087-5697eef2eaa9/bin/utaipan-eEHZpOm5b7/../../sv-benchmarks/c/seq-mthreaded/pals_opt-floodmax.3.1.ufo.UNBOUNDED.pals.c [2021-11-25 19:03:22,339 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ab89d83-ae16-4cd7-8087-5697eef2eaa9/bin/utaipan-eEHZpOm5b7/data/1d882cfc7/982659d2a45a438d8ca61ebb1e2faf68/FLAG75b6f39d1 [2021-11-25 19:03:22,853 INFO L306 CDTParser]: Found 1 translation units. [2021-11-25 19:03:22,854 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ab89d83-ae16-4cd7-8087-5697eef2eaa9/sv-benchmarks/c/seq-mthreaded/pals_opt-floodmax.3.1.ufo.UNBOUNDED.pals.c [2021-11-25 19:03:22,864 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ab89d83-ae16-4cd7-8087-5697eef2eaa9/bin/utaipan-eEHZpOm5b7/data/1d882cfc7/982659d2a45a438d8ca61ebb1e2faf68/FLAG75b6f39d1 [2021-11-25 19:03:23,185 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ab89d83-ae16-4cd7-8087-5697eef2eaa9/bin/utaipan-eEHZpOm5b7/data/1d882cfc7/982659d2a45a438d8ca61ebb1e2faf68 [2021-11-25 19:03:23,189 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-25 19:03:23,190 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-25 19:03:23,192 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-25 19:03:23,192 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-25 19:03:23,196 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-25 19:03:23,196 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 07:03:23" (1/1) ... [2021-11-25 19:03:23,198 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3ae8d61b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:03:23, skipping insertion in model container [2021-11-25 19:03:23,198 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 07:03:23" (1/1) ... [2021-11-25 19:03:23,205 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-25 19:03:23,245 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-25 19:03:23,490 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ab89d83-ae16-4cd7-8087-5697eef2eaa9/sv-benchmarks/c/seq-mthreaded/pals_opt-floodmax.3.1.ufo.UNBOUNDED.pals.c[12951,12964] [2021-11-25 19:03:23,493 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 19:03:23,502 INFO L203 MainTranslator]: Completed pre-run [2021-11-25 19:03:23,561 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ab89d83-ae16-4cd7-8087-5697eef2eaa9/sv-benchmarks/c/seq-mthreaded/pals_opt-floodmax.3.1.ufo.UNBOUNDED.pals.c[12951,12964] [2021-11-25 19:03:23,561 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 19:03:23,582 INFO L208 MainTranslator]: Completed translation [2021-11-25 19:03:23,583 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:03:23 WrapperNode [2021-11-25 19:03:23,583 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-25 19:03:23,584 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-25 19:03:23,584 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-25 19:03:23,585 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-25 19:03:23,592 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:03:23" (1/1) ... [2021-11-25 19:03:23,614 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:03:23" (1/1) ... [2021-11-25 19:03:23,663 INFO L137 Inliner]: procedures = 23, calls = 14, calls flagged for inlining = 9, calls inlined = 9, statements flattened = 467 [2021-11-25 19:03:23,670 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-25 19:03:23,671 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-25 19:03:23,671 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-25 19:03:23,671 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-25 19:03:23,680 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:03:23" (1/1) ... [2021-11-25 19:03:23,680 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:03:23" (1/1) ... [2021-11-25 19:03:23,693 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:03:23" (1/1) ... [2021-11-25 19:03:23,698 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:03:23" (1/1) ... [2021-11-25 19:03:23,708 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:03:23" (1/1) ... [2021-11-25 19:03:23,731 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:03:23" (1/1) ... [2021-11-25 19:03:23,733 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:03:23" (1/1) ... [2021-11-25 19:03:23,738 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-25 19:03:23,738 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-25 19:03:23,739 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-25 19:03:23,739 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-25 19:03:23,740 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:03:23" (1/1) ... [2021-11-25 19:03:23,747 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 19:03:23,757 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ab89d83-ae16-4cd7-8087-5697eef2eaa9/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:03:23,768 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ab89d83-ae16-4cd7-8087-5697eef2eaa9/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-25 19:03:23,784 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ab89d83-ae16-4cd7-8087-5697eef2eaa9/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-25 19:03:23,825 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-25 19:03:23,826 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-25 19:03:23,826 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-25 19:03:23,826 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-25 19:03:23,981 INFO L236 CfgBuilder]: Building ICFG [2021-11-25 19:03:23,982 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-25 19:03:24,522 INFO L277 CfgBuilder]: Performing block encoding [2021-11-25 19:03:25,109 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-25 19:03:25,109 INFO L301 CfgBuilder]: Removed 1 assume(true) statements. [2021-11-25 19:03:25,111 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 07:03:25 BoogieIcfgContainer [2021-11-25 19:03:25,112 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-25 19:03:25,116 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-25 19:03:25,116 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-25 19:03:25,119 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-25 19:03:25,119 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 07:03:23" (1/3) ... [2021-11-25 19:03:25,120 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@39fb5e96 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 07:03:25, skipping insertion in model container [2021-11-25 19:03:25,120 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:03:23" (2/3) ... [2021-11-25 19:03:25,121 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@39fb5e96 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 07:03:25, skipping insertion in model container [2021-11-25 19:03:25,121 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 07:03:25" (3/3) ... [2021-11-25 19:03:25,122 INFO L111 eAbstractionObserver]: Analyzing ICFG pals_opt-floodmax.3.1.ufo.UNBOUNDED.pals.c [2021-11-25 19:03:25,128 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-25 19:03:25,128 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-25 19:03:25,212 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-25 19:03:25,221 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-25 19:03:25,222 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-25 19:03:25,242 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) [2021-11-25 19:03:25,249 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-11-25 19:03:25,250 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:03:25,250 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-11-25 19:03:25,251 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:03:25,256 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:03:25,256 INFO L85 PathProgramCache]: Analyzing trace with hash 621893637, now seen corresponding path program 1 times [2021-11-25 19:03:25,266 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:03:25,266 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1905352294] [2021-11-25 19:03:25,267 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:03:25,268 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:03:25,521 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:03:25,794 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:03:25,795 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:03:25,795 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1905352294] [2021-11-25 19:03:25,796 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1905352294] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:03:25,796 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:03:25,796 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 19:03:25,798 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1726744332] [2021-11-25 19:03:25,798 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:03:25,802 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 19:03:25,803 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:03:25,837 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 19:03:25,838 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-25 19:03:25,840 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) [2021-11-25 19:03:25,976 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:03:25,976 INFO L93 Difference]: Finished difference Result 54 states and 90 transitions. [2021-11-25 19:03:25,980 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 19:03:25,981 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 [2021-11-25 19:03:25,982 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:03:25,990 INFO L225 Difference]: With dead ends: 54 [2021-11-25 19:03:25,990 INFO L226 Difference]: Without dead ends: 36 [2021-11-25 19:03:25,993 INFO L932 BasicCegarLoop]: 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 [2021-11-25 19:03:25,996 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 24 mSDsluCounter, 28 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 [2021-11-25 19:03:25,997 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [24 Valid, 38 Invalid, 46 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 44 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 19:03:26,014 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-11-25 19:03:26,027 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 27. [2021-11-25 19:03:26,029 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) [2021-11-25 19:03:26,030 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 43 transitions. [2021-11-25 19:03:26,031 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 43 transitions. Word has length 6 [2021-11-25 19:03:26,031 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:03:26,031 INFO L470 AbstractCegarLoop]: Abstraction has 27 states and 43 transitions. [2021-11-25 19:03:26,032 INFO L471 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) [2021-11-25 19:03:26,032 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 43 transitions. [2021-11-25 19:03:26,032 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-25 19:03:26,033 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:03:26,033 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:03:26,033 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-25 19:03:26,033 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:03:26,034 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:03:26,034 INFO L85 PathProgramCache]: Analyzing trace with hash 2036199050, now seen corresponding path program 1 times [2021-11-25 19:03:26,034 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:03:26,035 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [891398364] [2021-11-25 19:03:26,035 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:03:26,035 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:03:26,104 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:03:26,280 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:03:26,281 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:03:26,282 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [891398364] [2021-11-25 19:03:26,282 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [891398364] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:03:26,282 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:03:26,283 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 19:03:26,283 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1417116838] [2021-11-25 19:03:26,284 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:03:26,285 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 19:03:26,286 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:03:26,287 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 19:03:26,287 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-25 19:03:26,287 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) [2021-11-25 19:03:26,398 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:03:26,398 INFO L93 Difference]: Finished difference Result 53 states and 81 transitions. [2021-11-25 19:03:26,399 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 19:03:26,399 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 [2021-11-25 19:03:26,400 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:03:26,401 INFO L225 Difference]: With dead ends: 53 [2021-11-25 19:03:26,402 INFO L226 Difference]: Without dead ends: 36 [2021-11-25 19:03:26,406 INFO L932 BasicCegarLoop]: 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 [2021-11-25 19:03:26,409 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 22 mSDsluCounter, 30 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 [2021-11-25 19:03:26,410 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [22 Valid, 45 Invalid, 35 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 34 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 19:03:26,413 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-11-25 19:03:26,419 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 27. [2021-11-25 19:03:26,420 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) [2021-11-25 19:03:26,423 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 42 transitions. [2021-11-25 19:03:26,424 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 42 transitions. Word has length 7 [2021-11-25 19:03:26,427 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:03:26,428 INFO L470 AbstractCegarLoop]: Abstraction has 27 states and 42 transitions. [2021-11-25 19:03:26,429 INFO L471 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) [2021-11-25 19:03:26,430 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 42 transitions. [2021-11-25 19:03:26,431 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-25 19:03:26,431 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:03:26,431 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:03:26,432 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-25 19:03:26,432 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:03:26,433 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:03:26,434 INFO L85 PathProgramCache]: Analyzing trace with hash -1359521650, now seen corresponding path program 1 times [2021-11-25 19:03:26,435 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:03:26,435 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1320386943] [2021-11-25 19:03:26,435 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:03:26,436 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:03:26,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:03:26,590 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:03:26,591 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:03:26,592 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1320386943] [2021-11-25 19:03:26,592 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1320386943] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:03:26,593 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:03:26,593 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 19:03:26,593 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [329920144] [2021-11-25 19:03:26,593 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:03:26,594 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 19:03:26,594 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:03:26,595 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 19:03:26,596 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-25 19:03:26,596 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) [2021-11-25 19:03:26,688 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:03:26,688 INFO L93 Difference]: Finished difference Result 53 states and 80 transitions. [2021-11-25 19:03:26,688 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 19:03:26,689 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 [2021-11-25 19:03:26,689 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:03:26,691 INFO L225 Difference]: With dead ends: 53 [2021-11-25 19:03:26,691 INFO L226 Difference]: Without dead ends: 36 [2021-11-25 19:03:26,691 INFO L932 BasicCegarLoop]: 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 [2021-11-25 19:03:26,699 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 20 mSDsluCounter, 30 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 [2021-11-25 19:03:26,701 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [20 Valid, 45 Invalid, 38 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 37 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 19:03:26,702 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-11-25 19:03:26,706 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 27. [2021-11-25 19:03:26,708 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) [2021-11-25 19:03:26,710 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 41 transitions. [2021-11-25 19:03:26,710 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 41 transitions. Word has length 8 [2021-11-25 19:03:26,710 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:03:26,711 INFO L470 AbstractCegarLoop]: Abstraction has 27 states and 41 transitions. [2021-11-25 19:03:26,711 INFO L471 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) [2021-11-25 19:03:26,712 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 41 transitions. [2021-11-25 19:03:26,712 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-11-25 19:03:26,712 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:03:26,713 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:03:26,713 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-25 19:03:26,713 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:03:26,714 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:03:26,714 INFO L85 PathProgramCache]: Analyzing trace with hash 752770803, now seen corresponding path program 1 times [2021-11-25 19:03:26,714 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:03:26,714 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1291379368] [2021-11-25 19:03:26,715 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:03:26,715 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:03:26,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:03:26,821 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:03:26,821 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:03:26,822 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1291379368] [2021-11-25 19:03:26,822 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1291379368] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:03:26,822 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:03:26,822 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 19:03:26,822 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1714318980] [2021-11-25 19:03:26,823 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:03:26,823 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 19:03:26,823 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:03:26,824 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 19:03:26,824 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-25 19:03:26,824 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) [2021-11-25 19:03:26,931 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:03:26,931 INFO L93 Difference]: Finished difference Result 53 states and 79 transitions. [2021-11-25 19:03:26,932 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 19:03:26,932 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 [2021-11-25 19:03:26,932 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:03:26,933 INFO L225 Difference]: With dead ends: 53 [2021-11-25 19:03:26,933 INFO L226 Difference]: Without dead ends: 36 [2021-11-25 19:03:26,933 INFO L932 BasicCegarLoop]: 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 [2021-11-25 19:03:26,934 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 18 mSDsluCounter, 28 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 [2021-11-25 19:03:26,935 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [18 Valid, 43 Invalid, 35 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 34 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 19:03:26,936 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-11-25 19:03:26,939 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 27. [2021-11-25 19:03:26,939 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) [2021-11-25 19:03:26,940 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 40 transitions. [2021-11-25 19:03:26,940 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 40 transitions. Word has length 9 [2021-11-25 19:03:26,940 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:03:26,941 INFO L470 AbstractCegarLoop]: Abstraction has 27 states and 40 transitions. [2021-11-25 19:03:26,941 INFO L471 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) [2021-11-25 19:03:26,941 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 40 transitions. [2021-11-25 19:03:26,941 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-25 19:03:26,941 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:03:26,942 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:03:26,942 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-25 19:03:26,942 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:03:26,942 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:03:26,943 INFO L85 PathProgramCache]: Analyzing trace with hash 384687995, now seen corresponding path program 1 times [2021-11-25 19:03:26,943 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:03:26,943 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1317272511] [2021-11-25 19:03:26,943 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:03:26,943 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:03:27,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:03:27,090 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:03:27,090 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:03:27,091 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1317272511] [2021-11-25 19:03:27,091 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1317272511] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:03:27,091 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:03:27,091 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 19:03:27,091 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2054239614] [2021-11-25 19:03:27,091 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:03:27,092 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 19:03:27,092 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:03:27,092 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 19:03:27,092 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-25 19:03:27,093 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) [2021-11-25 19:03:27,176 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:03:27,176 INFO L93 Difference]: Finished difference Result 53 states and 78 transitions. [2021-11-25 19:03:27,177 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 19:03:27,177 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 [2021-11-25 19:03:27,177 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:03:27,178 INFO L225 Difference]: With dead ends: 53 [2021-11-25 19:03:27,178 INFO L226 Difference]: Without dead ends: 36 [2021-11-25 19:03:27,178 INFO L932 BasicCegarLoop]: 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 [2021-11-25 19:03:27,179 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 15 mSDsluCounter, 28 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 [2021-11-25 19:03:27,180 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 42 Invalid, 41 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 40 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 19:03:27,180 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-11-25 19:03:27,183 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 27. [2021-11-25 19:03:27,184 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) [2021-11-25 19:03:27,184 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 39 transitions. [2021-11-25 19:03:27,184 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 39 transitions. Word has length 11 [2021-11-25 19:03:27,184 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:03:27,185 INFO L470 AbstractCegarLoop]: Abstraction has 27 states and 39 transitions. [2021-11-25 19:03:27,185 INFO L471 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) [2021-11-25 19:03:27,185 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 39 transitions. [2021-11-25 19:03:27,185 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-11-25 19:03:27,185 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:03:27,186 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:03:27,186 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-25 19:03:27,186 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:03:27,186 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:03:27,186 INFO L85 PathProgramCache]: Analyzing trace with hash -1047501115, now seen corresponding path program 1 times [2021-11-25 19:03:27,187 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:03:27,187 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [824237129] [2021-11-25 19:03:27,187 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:03:27,187 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:03:27,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:03:27,366 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:03:27,366 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:03:27,367 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [824237129] [2021-11-25 19:03:27,367 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [824237129] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:03:27,367 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:03:27,367 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 19:03:27,367 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1845286978] [2021-11-25 19:03:27,367 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:03:27,368 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 19:03:27,368 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:03:27,368 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 19:03:27,369 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-25 19:03:27,369 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) [2021-11-25 19:03:27,441 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:03:27,441 INFO L93 Difference]: Finished difference Result 54 states and 79 transitions. [2021-11-25 19:03:27,442 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 19:03:27,442 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 [2021-11-25 19:03:27,442 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:03:27,443 INFO L225 Difference]: With dead ends: 54 [2021-11-25 19:03:27,443 INFO L226 Difference]: Without dead ends: 35 [2021-11-25 19:03:27,443 INFO L932 BasicCegarLoop]: 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 [2021-11-25 19:03:27,444 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 12 mSDsluCounter, 38 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 [2021-11-25 19:03:27,445 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 57 Invalid, 28 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 25 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 19:03:27,445 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2021-11-25 19:03:27,448 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 27. [2021-11-25 19:03:27,448 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) [2021-11-25 19:03:27,449 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 37 transitions. [2021-11-25 19:03:27,449 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 37 transitions. Word has length 12 [2021-11-25 19:03:27,449 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:03:27,449 INFO L470 AbstractCegarLoop]: Abstraction has 27 states and 37 transitions. [2021-11-25 19:03:27,449 INFO L471 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) [2021-11-25 19:03:27,450 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 37 transitions. [2021-11-25 19:03:27,450 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-11-25 19:03:27,450 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:03:27,450 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:03:27,450 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-25 19:03:27,451 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:03:27,451 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:03:27,451 INFO L85 PathProgramCache]: Analyzing trace with hash -112436981, now seen corresponding path program 1 times [2021-11-25 19:03:27,451 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:03:27,452 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2112174026] [2021-11-25 19:03:27,452 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:03:27,452 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:03:27,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:03:27,643 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:03:27,643 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:03:27,643 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2112174026] [2021-11-25 19:03:27,643 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2112174026] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:03:27,644 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:03:27,644 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 19:03:27,644 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [83253310] [2021-11-25 19:03:27,644 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:03:27,644 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 19:03:27,644 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:03:27,645 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 19:03:27,645 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-25 19:03:27,645 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) [2021-11-25 19:03:27,718 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:03:27,718 INFO L93 Difference]: Finished difference Result 52 states and 73 transitions. [2021-11-25 19:03:27,718 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 19:03:27,719 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 [2021-11-25 19:03:27,719 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:03:27,719 INFO L225 Difference]: With dead ends: 52 [2021-11-25 19:03:27,719 INFO L226 Difference]: Without dead ends: 35 [2021-11-25 19:03:27,720 INFO L932 BasicCegarLoop]: 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 [2021-11-25 19:03:27,725 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 7 mSDsluCounter, 34 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 [2021-11-25 19:03:27,725 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7 Valid, 52 Invalid, 31 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 30 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 19:03:27,726 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2021-11-25 19:03:27,730 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 28. [2021-11-25 19:03:27,731 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) [2021-11-25 19:03:27,731 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 38 transitions. [2021-11-25 19:03:27,731 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 38 transitions. Word has length 14 [2021-11-25 19:03:27,732 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:03:27,732 INFO L470 AbstractCegarLoop]: Abstraction has 28 states and 38 transitions. [2021-11-25 19:03:27,732 INFO L471 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) [2021-11-25 19:03:27,732 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 38 transitions. [2021-11-25 19:03:27,733 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-11-25 19:03:27,733 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:03:27,733 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:03:27,733 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-25 19:03:27,733 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:03:27,734 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:03:27,734 INFO L85 PathProgramCache]: Analyzing trace with hash 799069577, now seen corresponding path program 1 times [2021-11-25 19:03:27,734 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:03:27,734 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1678238934] [2021-11-25 19:03:27,736 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:03:27,737 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:03:27,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:03:27,856 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:03:27,856 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:03:27,857 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1678238934] [2021-11-25 19:03:27,857 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1678238934] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:03:27,857 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:03:27,857 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-25 19:03:27,857 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1583800174] [2021-11-25 19:03:27,858 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:03:27,859 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 19:03:27,859 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:03:27,860 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 19:03:27,860 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-25 19:03:27,860 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) [2021-11-25 19:03:28,010 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:03:28,010 INFO L93 Difference]: Finished difference Result 75 states and 110 transitions. [2021-11-25 19:03:28,010 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-25 19:03:28,011 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 [2021-11-25 19:03:28,011 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:03:28,012 INFO L225 Difference]: With dead ends: 75 [2021-11-25 19:03:28,012 INFO L226 Difference]: Without dead ends: 58 [2021-11-25 19:03:28,012 INFO L932 BasicCegarLoop]: 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 [2021-11-25 19:03:28,013 INFO L933 BasicCegarLoop]: 31 mSDtfsCounter, 41 mSDsluCounter, 70 mSDsCounter, 0 mSdLazyCounter, 50 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 41 SdHoareTripleChecker+Valid, 98 SdHoareTripleChecker+Invalid, 60 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 50 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:03:28,013 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [41 Valid, 98 Invalid, 60 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 50 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 19:03:28,014 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2021-11-25 19:03:28,018 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 33. [2021-11-25 19:03:28,019 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) [2021-11-25 19:03:28,019 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 43 transitions. [2021-11-25 19:03:28,020 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 43 transitions. Word has length 15 [2021-11-25 19:03:28,020 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:03:28,020 INFO L470 AbstractCegarLoop]: Abstraction has 33 states and 43 transitions. [2021-11-25 19:03:28,020 INFO L471 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) [2021-11-25 19:03:28,020 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 43 transitions. [2021-11-25 19:03:28,021 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-25 19:03:28,021 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:03:28,021 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:03:28,021 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-25 19:03:28,022 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:03:28,022 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:03:28,022 INFO L85 PathProgramCache]: Analyzing trace with hash 950358233, now seen corresponding path program 1 times [2021-11-25 19:03:28,022 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:03:28,023 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1553854927] [2021-11-25 19:03:28,023 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:03:28,023 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:03:28,206 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:03:28,476 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:03:28,477 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:03:28,477 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1553854927] [2021-11-25 19:03:28,477 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1553854927] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:03:28,477 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1498420409] [2021-11-25 19:03:28,477 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:03:28,478 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:03:28,478 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ab89d83-ae16-4cd7-8087-5697eef2eaa9/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:03:28,484 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ab89d83-ae16-4cd7-8087-5697eef2eaa9/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:03:28,507 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ab89d83-ae16-4cd7-8087-5697eef2eaa9/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-25 19:03:28,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:03:28,686 INFO L263 TraceCheckSpWp]: Trace formula consists of 207 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-25 19:03:28,700 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:03:44,188 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:03:44,188 INFO L328 TraceCheckSpWp]: Computing backward predicates...