./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/seq-mthreaded-reduced/pals_floodmax.3.4.ufo.UNBOUNDED.pals.c.v+cfa-reducer.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 9ad7fb26 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_70be7453-b122-496c-a835-5dd4cc5ecc8f/bin/utaipan-aC7eJsxGYH/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_70be7453-b122-496c-a835-5dd4cc5ecc8f/bin/utaipan-aC7eJsxGYH/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_70be7453-b122-496c-a835-5dd4cc5ecc8f/bin/utaipan-aC7eJsxGYH/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_70be7453-b122-496c-a835-5dd4cc5ecc8f/bin/utaipan-aC7eJsxGYH/config/TaipanReach.xml -i ../../sv-benchmarks/c/seq-mthreaded-reduced/pals_floodmax.3.4.ufo.UNBOUNDED.pals.c.v+cfa-reducer.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_70be7453-b122-496c-a835-5dd4cc5ecc8f/bin/utaipan-aC7eJsxGYH/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_70be7453-b122-496c-a835-5dd4cc5ecc8f/bin/utaipan-aC7eJsxGYH --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 b178b656343d0e2ffc6b5c87d592ef5d1e640f986fa3fd9fab639777f6d58eb8 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-9ad7fb2 [2021-11-03 05:15:10,576 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-03 05:15:10,578 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-03 05:15:10,616 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-03 05:15:10,617 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-03 05:15:10,618 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-03 05:15:10,620 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-03 05:15:10,623 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-03 05:15:10,626 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-03 05:15:10,629 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-03 05:15:10,630 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-03 05:15:10,637 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-03 05:15:10,638 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-03 05:15:10,647 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-03 05:15:10,649 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-03 05:15:10,650 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-03 05:15:10,651 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-03 05:15:10,652 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-03 05:15:10,655 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-03 05:15:10,658 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-03 05:15:10,665 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-03 05:15:10,667 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-03 05:15:10,672 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-03 05:15:10,673 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-03 05:15:10,686 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-03 05:15:10,687 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-03 05:15:10,687 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-03 05:15:10,689 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-03 05:15:10,690 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-03 05:15:10,691 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-03 05:15:10,691 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-03 05:15:10,692 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-03 05:15:10,694 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-03 05:15:10,695 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-03 05:15:10,697 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-03 05:15:10,697 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-03 05:15:10,697 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-03 05:15:10,698 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-03 05:15:10,698 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-03 05:15:10,702 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-03 05:15:10,703 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-03 05:15:10,703 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_70be7453-b122-496c-a835-5dd4cc5ecc8f/bin/utaipan-aC7eJsxGYH/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-03 05:15:10,729 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-03 05:15:10,730 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-03 05:15:10,730 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-03 05:15:10,731 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-03 05:15:10,731 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-03 05:15:10,731 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-03 05:15:10,731 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-03 05:15:10,732 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-03 05:15:10,732 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-03 05:15:10,732 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-03 05:15:10,732 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-03 05:15:10,732 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-03 05:15:10,733 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-03 05:15:10,733 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-03 05:15:10,733 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2021-11-03 05:15:10,734 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-03 05:15:10,734 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-03 05:15:10,734 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-03 05:15:10,734 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-03 05:15:10,734 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-03 05:15:10,734 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-03 05:15:10,735 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-03 05:15:10,735 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-03 05:15:10,735 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-03 05:15:10,735 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-03 05:15:10,735 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-03 05:15:10,736 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-03 05:15:10,736 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-03 05:15:10,736 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-03 05:15:10,736 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-03 05:15:10,737 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-03 05:15:10,737 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-03 05:15:10,737 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-03 05:15:10,737 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-03 05:15:10,737 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-03 05:15:10,738 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-03 05:15:10,738 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-03 05:15:10,738 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-03 05:15:10,738 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-03 05:15:10,738 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_70be7453-b122-496c-a835-5dd4cc5ecc8f/bin/utaipan-aC7eJsxGYH/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_70be7453-b122-496c-a835-5dd4cc5ecc8f/bin/utaipan-aC7eJsxGYH Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> b178b656343d0e2ffc6b5c87d592ef5d1e640f986fa3fd9fab639777f6d58eb8 [2021-11-03 05:15:11,007 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-03 05:15:11,031 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-03 05:15:11,034 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-03 05:15:11,035 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-03 05:15:11,036 INFO L275 PluginConnector]: CDTParser initialized [2021-11-03 05:15:11,037 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_70be7453-b122-496c-a835-5dd4cc5ecc8f/bin/utaipan-aC7eJsxGYH/../../sv-benchmarks/c/seq-mthreaded-reduced/pals_floodmax.3.4.ufo.UNBOUNDED.pals.c.v+cfa-reducer.c [2021-11-03 05:15:11,111 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_70be7453-b122-496c-a835-5dd4cc5ecc8f/bin/utaipan-aC7eJsxGYH/data/fe8e13675/ae2478c0f0f445c39aa7ec0c5fa8dce2/FLAG307463e25 [2021-11-03 05:15:11,573 INFO L306 CDTParser]: Found 1 translation units. [2021-11-03 05:15:11,574 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_70be7453-b122-496c-a835-5dd4cc5ecc8f/sv-benchmarks/c/seq-mthreaded-reduced/pals_floodmax.3.4.ufo.UNBOUNDED.pals.c.v+cfa-reducer.c [2021-11-03 05:15:11,585 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_70be7453-b122-496c-a835-5dd4cc5ecc8f/bin/utaipan-aC7eJsxGYH/data/fe8e13675/ae2478c0f0f445c39aa7ec0c5fa8dce2/FLAG307463e25 [2021-11-03 05:15:11,913 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_70be7453-b122-496c-a835-5dd4cc5ecc8f/bin/utaipan-aC7eJsxGYH/data/fe8e13675/ae2478c0f0f445c39aa7ec0c5fa8dce2 [2021-11-03 05:15:11,915 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-03 05:15:11,916 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-03 05:15:11,918 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-03 05:15:11,918 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-03 05:15:11,921 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-03 05:15:11,921 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.11 05:15:11" (1/1) ... [2021-11-03 05:15:11,922 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@255b0289 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 05:15:11, skipping insertion in model container [2021-11-03 05:15:11,922 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.11 05:15:11" (1/1) ... [2021-11-03 05:15:11,929 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-03 05:15:11,979 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-03 05:15:12,219 WARN L228 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_70be7453-b122-496c-a835-5dd4cc5ecc8f/sv-benchmarks/c/seq-mthreaded-reduced/pals_floodmax.3.4.ufo.UNBOUNDED.pals.c.v+cfa-reducer.c[7349,7362] [2021-11-03 05:15:12,269 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-03 05:15:12,300 INFO L203 MainTranslator]: Completed pre-run [2021-11-03 05:15:12,369 WARN L228 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_70be7453-b122-496c-a835-5dd4cc5ecc8f/sv-benchmarks/c/seq-mthreaded-reduced/pals_floodmax.3.4.ufo.UNBOUNDED.pals.c.v+cfa-reducer.c[7349,7362] [2021-11-03 05:15:12,412 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-03 05:15:12,436 INFO L208 MainTranslator]: Completed translation [2021-11-03 05:15:12,437 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 05:15:12 WrapperNode [2021-11-03 05:15:12,437 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-03 05:15:12,438 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-03 05:15:12,438 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-03 05:15:12,438 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-03 05:15:12,451 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 05:15:12" (1/1) ... [2021-11-03 05:15:12,463 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 05:15:12" (1/1) ... [2021-11-03 05:15:12,535 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-03 05:15:12,536 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-03 05:15:12,536 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-03 05:15:12,536 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-03 05:15:12,548 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 05:15:12" (1/1) ... [2021-11-03 05:15:12,548 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 05:15:12" (1/1) ... [2021-11-03 05:15:12,559 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 05:15:12" (1/1) ... [2021-11-03 05:15:12,560 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 05:15:12" (1/1) ... [2021-11-03 05:15:12,586 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 05:15:12" (1/1) ... [2021-11-03 05:15:12,605 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 05:15:12" (1/1) ... [2021-11-03 05:15:12,608 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 05:15:12" (1/1) ... [2021-11-03 05:15:12,627 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-03 05:15:12,628 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-03 05:15:12,628 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-03 05:15:12,629 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-03 05:15:12,630 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 05:15:12" (1/1) ... [2021-11-03 05:15:12,637 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-03 05:15:12,648 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_70be7453-b122-496c-a835-5dd4cc5ecc8f/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 05:15:12,659 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_70be7453-b122-496c-a835-5dd4cc5ecc8f/bin/utaipan-aC7eJsxGYH/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-03 05:15:12,687 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_70be7453-b122-496c-a835-5dd4cc5ecc8f/bin/utaipan-aC7eJsxGYH/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-03 05:15:12,705 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-03 05:15:12,705 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-03 05:15:12,705 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-03 05:15:12,706 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-03 05:15:14,289 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-03 05:15:14,290 INFO L299 CfgBuilder]: Removed 4 assume(true) statements. [2021-11-03 05:15:14,293 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.11 05:15:14 BoogieIcfgContainer [2021-11-03 05:15:14,293 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-03 05:15:14,295 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-03 05:15:14,295 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-03 05:15:14,298 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-03 05:15:14,298 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 03.11 05:15:11" (1/3) ... [2021-11-03 05:15:14,299 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3c10d9d2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.11 05:15:14, skipping insertion in model container [2021-11-03 05:15:14,300 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 05:15:12" (2/3) ... [2021-11-03 05:15:14,300 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3c10d9d2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.11 05:15:14, skipping insertion in model container [2021-11-03 05:15:14,300 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.11 05:15:14" (3/3) ... [2021-11-03 05:15:14,302 INFO L111 eAbstractionObserver]: Analyzing ICFG pals_floodmax.3.4.ufo.UNBOUNDED.pals.c.v+cfa-reducer.c [2021-11-03 05:15:14,313 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-03 05:15:14,314 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-03 05:15:14,383 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-03 05:15:14,389 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 [2021-11-03 05:15:14,390 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-03 05:15:14,413 INFO L276 IsEmpty]: Start isEmpty. Operand has 86 states, 84 states have (on average 1.7619047619047619) internal successors, (148), 85 states have internal predecessors, (148), 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) [2021-11-03 05:15:14,422 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-11-03 05:15:14,422 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:15:14,422 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:15:14,423 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:15:14,428 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:15:14,428 INFO L85 PathProgramCache]: Analyzing trace with hash 1768052657, now seen corresponding path program 1 times [2021-11-03 05:15:14,447 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:15:14,447 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [779963087] [2021-11-03 05:15:14,447 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:15:14,448 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:15:14,624 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:15:14,812 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:15:14,813 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:15:14,814 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [779963087] [2021-11-03 05:15:14,815 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [779963087] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-03 05:15:14,815 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-03 05:15:14,816 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-03 05:15:14,827 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [95283202] [2021-11-03 05:15:14,833 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-03 05:15:14,834 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:15:14,851 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-03 05:15:14,853 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-03 05:15:14,856 INFO L87 Difference]: Start difference. First operand has 86 states, 84 states have (on average 1.7619047619047619) internal successors, (148), 85 states have internal predecessors, (148), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 12.333333333333334) internal successors, (37), 3 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) [2021-11-03 05:15:14,940 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:15:14,940 INFO L93 Difference]: Finished difference Result 188 states and 311 transitions. [2021-11-03 05:15:14,941 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-03 05:15:14,942 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 12.333333333333334) internal successors, (37), 3 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) Word has length 37 [2021-11-03 05:15:14,943 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:15:14,959 INFO L225 Difference]: With dead ends: 188 [2021-11-03 05:15:14,959 INFO L226 Difference]: Without dead ends: 127 [2021-11-03 05:15:14,963 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-03 05:15:14,979 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2021-11-03 05:15:15,015 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 125. [2021-11-03 05:15:15,017 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 125 states, 124 states have (on average 1.5) internal successors, (186), 124 states have internal predecessors, (186), 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) [2021-11-03 05:15:15,018 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 186 transitions. [2021-11-03 05:15:15,019 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 186 transitions. Word has length 37 [2021-11-03 05:15:15,020 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:15:15,020 INFO L470 AbstractCegarLoop]: Abstraction has 125 states and 186 transitions. [2021-11-03 05:15:15,020 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 12.333333333333334) internal successors, (37), 3 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) [2021-11-03 05:15:15,021 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 186 transitions. [2021-11-03 05:15:15,022 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-11-03 05:15:15,022 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:15:15,022 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:15:15,023 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-03 05:15:15,023 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:15:15,024 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:15:15,024 INFO L85 PathProgramCache]: Analyzing trace with hash 938619083, now seen corresponding path program 1 times [2021-11-03 05:15:15,024 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:15:15,024 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [426663752] [2021-11-03 05:15:15,024 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:15:15,025 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:15:15,107 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:15:15,174 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:15:15,174 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:15:15,175 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [426663752] [2021-11-03 05:15:15,175 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [426663752] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-03 05:15:15,175 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-03 05:15:15,175 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-03 05:15:15,176 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1439534273] [2021-11-03 05:15:15,177 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-03 05:15:15,177 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:15:15,178 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-03 05:15:15,178 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-03 05:15:15,178 INFO L87 Difference]: Start difference. First operand 125 states and 186 transitions. Second operand has 3 states, 3 states have (on average 13.0) internal successors, (39), 3 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) [2021-11-03 05:15:15,257 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:15:15,258 INFO L93 Difference]: Finished difference Result 266 states and 415 transitions. [2021-11-03 05:15:15,258 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-03 05:15:15,259 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 13.0) internal successors, (39), 3 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) Word has length 39 [2021-11-03 05:15:15,259 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:15:15,265 INFO L225 Difference]: With dead ends: 266 [2021-11-03 05:15:15,265 INFO L226 Difference]: Without dead ends: 170 [2021-11-03 05:15:15,267 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-03 05:15:15,268 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 170 states. [2021-11-03 05:15:15,286 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 170 to 168. [2021-11-03 05:15:15,286 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 168 states, 167 states have (on average 1.5149700598802396) internal successors, (253), 167 states have internal predecessors, (253), 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) [2021-11-03 05:15:15,287 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 168 states to 168 states and 253 transitions. [2021-11-03 05:15:15,288 INFO L78 Accepts]: Start accepts. Automaton has 168 states and 253 transitions. Word has length 39 [2021-11-03 05:15:15,288 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:15:15,288 INFO L470 AbstractCegarLoop]: Abstraction has 168 states and 253 transitions. [2021-11-03 05:15:15,288 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 13.0) internal successors, (39), 3 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) [2021-11-03 05:15:15,289 INFO L276 IsEmpty]: Start isEmpty. Operand 168 states and 253 transitions. [2021-11-03 05:15:15,290 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-11-03 05:15:15,290 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:15:15,290 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:15:15,291 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-03 05:15:15,291 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:15:15,291 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:15:15,291 INFO L85 PathProgramCache]: Analyzing trace with hash 2080335096, now seen corresponding path program 1 times [2021-11-03 05:15:15,292 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:15:15,292 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1501122999] [2021-11-03 05:15:15,292 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:15:15,292 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:15:15,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:15:15,375 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:15:15,376 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:15:15,376 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1501122999] [2021-11-03 05:15:15,376 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1501122999] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-03 05:15:15,377 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-03 05:15:15,377 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-03 05:15:15,377 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [43535352] [2021-11-03 05:15:15,378 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-03 05:15:15,378 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:15:15,378 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-03 05:15:15,379 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-03 05:15:15,379 INFO L87 Difference]: Start difference. First operand 168 states and 253 transitions. Second operand has 3 states, 3 states have (on average 13.666666666666666) internal successors, (41), 3 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) [2021-11-03 05:15:15,409 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:15:15,409 INFO L93 Difference]: Finished difference Result 408 states and 642 transitions. [2021-11-03 05:15:15,410 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-03 05:15:15,410 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 13.666666666666666) internal successors, (41), 3 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) Word has length 41 [2021-11-03 05:15:15,410 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:15:15,412 INFO L225 Difference]: With dead ends: 408 [2021-11-03 05:15:15,413 INFO L226 Difference]: Without dead ends: 270 [2021-11-03 05:15:15,414 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-03 05:15:15,415 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 270 states. [2021-11-03 05:15:15,436 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 270 to 268. [2021-11-03 05:15:15,437 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 268 states, 267 states have (on average 1.554307116104869) internal successors, (415), 267 states have internal predecessors, (415), 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) [2021-11-03 05:15:15,438 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 268 states to 268 states and 415 transitions. [2021-11-03 05:15:15,439 INFO L78 Accepts]: Start accepts. Automaton has 268 states and 415 transitions. Word has length 41 [2021-11-03 05:15:15,439 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:15:15,439 INFO L470 AbstractCegarLoop]: Abstraction has 268 states and 415 transitions. [2021-11-03 05:15:15,440 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 13.666666666666666) internal successors, (41), 3 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) [2021-11-03 05:15:15,440 INFO L276 IsEmpty]: Start isEmpty. Operand 268 states and 415 transitions. [2021-11-03 05:15:15,441 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-11-03 05:15:15,442 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:15:15,442 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:15:15,442 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-03 05:15:15,443 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:15:15,443 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:15:15,443 INFO L85 PathProgramCache]: Analyzing trace with hash -1713059214, now seen corresponding path program 1 times [2021-11-03 05:15:15,444 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:15:15,444 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [274732103] [2021-11-03 05:15:15,444 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:15:15,444 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:15:15,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:15:15,555 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:15:15,555 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:15:15,555 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [274732103] [2021-11-03 05:15:15,555 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [274732103] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-03 05:15:15,556 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-03 05:15:15,556 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-03 05:15:15,556 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [51634605] [2021-11-03 05:15:15,557 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-03 05:15:15,557 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:15:15,557 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-03 05:15:15,568 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-03 05:15:15,569 INFO L87 Difference]: Start difference. First operand 268 states and 415 transitions. Second operand has 3 states, 3 states have (on average 14.333333333333334) internal successors, (43), 3 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) [2021-11-03 05:15:15,614 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:15:15,614 INFO L93 Difference]: Finished difference Result 657 states and 1042 transitions. [2021-11-03 05:15:15,615 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-03 05:15:15,615 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 14.333333333333334) internal successors, (43), 3 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) Word has length 43 [2021-11-03 05:15:15,616 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:15:15,618 INFO L225 Difference]: With dead ends: 657 [2021-11-03 05:15:15,619 INFO L226 Difference]: Without dead ends: 419 [2021-11-03 05:15:15,620 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-03 05:15:15,620 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 419 states. [2021-11-03 05:15:15,652 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 419 to 417. [2021-11-03 05:15:15,653 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 417 states, 416 states have (on average 1.5697115384615385) internal successors, (653), 416 states have internal predecessors, (653), 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) [2021-11-03 05:15:15,655 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 417 states to 417 states and 653 transitions. [2021-11-03 05:15:15,655 INFO L78 Accepts]: Start accepts. Automaton has 417 states and 653 transitions. Word has length 43 [2021-11-03 05:15:15,656 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:15:15,656 INFO L470 AbstractCegarLoop]: Abstraction has 417 states and 653 transitions. [2021-11-03 05:15:15,656 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 14.333333333333334) internal successors, (43), 3 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) [2021-11-03 05:15:15,657 INFO L276 IsEmpty]: Start isEmpty. Operand 417 states and 653 transitions. [2021-11-03 05:15:15,658 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-11-03 05:15:15,658 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:15:15,658 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:15:15,659 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-03 05:15:15,659 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:15:15,659 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:15:15,660 INFO L85 PathProgramCache]: Analyzing trace with hash -334539291, now seen corresponding path program 1 times [2021-11-03 05:15:15,660 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:15:15,660 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1685261603] [2021-11-03 05:15:15,661 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:15:15,661 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:15:15,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:15:15,755 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:15:15,756 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:15:15,756 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1685261603] [2021-11-03 05:15:15,756 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1685261603] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-03 05:15:15,756 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-03 05:15:15,757 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-03 05:15:15,757 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1780789189] [2021-11-03 05:15:15,758 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-03 05:15:15,758 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:15:15,759 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-03 05:15:15,760 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-03 05:15:15,760 INFO L87 Difference]: Start difference. First operand 417 states and 653 transitions. Second operand has 3 states, 3 states have (on average 15.0) internal successors, (45), 3 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:15:15,814 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:15:15,814 INFO L93 Difference]: Finished difference Result 1057 states and 1690 transitions. [2021-11-03 05:15:15,814 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-03 05:15:15,815 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 15.0) internal successors, (45), 3 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 45 [2021-11-03 05:15:15,815 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:15:15,819 INFO L225 Difference]: With dead ends: 1057 [2021-11-03 05:15:15,819 INFO L226 Difference]: Without dead ends: 683 [2021-11-03 05:15:15,821 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-03 05:15:15,821 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 683 states. [2021-11-03 05:15:15,862 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 683 to 681. [2021-11-03 05:15:15,864 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 681 states, 680 states have (on average 1.5823529411764705) internal successors, (1076), 680 states have internal predecessors, (1076), 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) [2021-11-03 05:15:15,867 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 681 states to 681 states and 1076 transitions. [2021-11-03 05:15:15,867 INFO L78 Accepts]: Start accepts. Automaton has 681 states and 1076 transitions. Word has length 45 [2021-11-03 05:15:15,867 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:15:15,868 INFO L470 AbstractCegarLoop]: Abstraction has 681 states and 1076 transitions. [2021-11-03 05:15:15,868 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 15.0) internal successors, (45), 3 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:15:15,868 INFO L276 IsEmpty]: Start isEmpty. Operand 681 states and 1076 transitions. [2021-11-03 05:15:15,869 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-11-03 05:15:15,869 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:15:15,869 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:15:15,870 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-03 05:15:15,870 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:15:15,870 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:15:15,871 INFO L85 PathProgramCache]: Analyzing trace with hash -312170093, now seen corresponding path program 1 times [2021-11-03 05:15:15,871 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:15:15,871 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1390182476] [2021-11-03 05:15:15,871 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:15:15,871 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:15:15,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:15:15,947 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:15:15,951 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:15:15,951 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1390182476] [2021-11-03 05:15:15,952 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1390182476] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-03 05:15:15,952 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-03 05:15:15,952 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-03 05:15:15,953 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [547968248] [2021-11-03 05:15:15,953 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-03 05:15:15,953 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:15:15,956 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-03 05:15:15,962 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-03 05:15:15,963 INFO L87 Difference]: Start difference. First operand 681 states and 1076 transitions. Second operand has 3 states, 3 states have (on average 15.666666666666666) internal successors, (47), 3 states have internal predecessors, (47), 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) [2021-11-03 05:15:16,040 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:15:16,040 INFO L93 Difference]: Finished difference Result 1706 states and 2726 transitions. [2021-11-03 05:15:16,041 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-03 05:15:16,041 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 15.666666666666666) internal successors, (47), 3 states have internal predecessors, (47), 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 47 [2021-11-03 05:15:16,043 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:15:16,049 INFO L225 Difference]: With dead ends: 1706 [2021-11-03 05:15:16,050 INFO L226 Difference]: Without dead ends: 1068 [2021-11-03 05:15:16,051 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-03 05:15:16,052 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1068 states. [2021-11-03 05:15:16,118 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1068 to 1066. [2021-11-03 05:15:16,121 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1066 states, 1065 states have (on average 1.5859154929577466) internal successors, (1689), 1065 states have internal predecessors, (1689), 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) [2021-11-03 05:15:16,125 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1066 states to 1066 states and 1689 transitions. [2021-11-03 05:15:16,125 INFO L78 Accepts]: Start accepts. Automaton has 1066 states and 1689 transitions. Word has length 47 [2021-11-03 05:15:16,126 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:15:16,127 INFO L470 AbstractCegarLoop]: Abstraction has 1066 states and 1689 transitions. [2021-11-03 05:15:16,127 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 15.666666666666666) internal successors, (47), 3 states have internal predecessors, (47), 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) [2021-11-03 05:15:16,128 INFO L276 IsEmpty]: Start isEmpty. Operand 1066 states and 1689 transitions. [2021-11-03 05:15:16,133 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-11-03 05:15:16,133 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:15:16,134 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:15:16,134 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-03 05:15:16,134 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:15:16,135 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:15:16,135 INFO L85 PathProgramCache]: Analyzing trace with hash -1501020928, now seen corresponding path program 1 times [2021-11-03 05:15:16,135 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:15:16,140 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [46235038] [2021-11-03 05:15:16,140 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:15:16,141 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:15:16,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:15:16,255 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:15:16,256 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:15:16,256 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [46235038] [2021-11-03 05:15:16,256 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [46235038] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-03 05:15:16,257 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-03 05:15:16,257 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-03 05:15:16,257 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1953063144] [2021-11-03 05:15:16,257 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-03 05:15:16,258 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:15:16,258 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-03 05:15:16,258 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-03 05:15:16,259 INFO L87 Difference]: Start difference. First operand 1066 states and 1689 transitions. Second operand has 5 states, 5 states have (on average 9.8) internal successors, (49), 5 states have internal predecessors, (49), 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) [2021-11-03 05:15:16,635 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:15:16,635 INFO L93 Difference]: Finished difference Result 3355 states and 5314 transitions. [2021-11-03 05:15:16,636 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-03 05:15:16,636 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 9.8) internal successors, (49), 5 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 49 [2021-11-03 05:15:16,638 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:15:16,655 INFO L225 Difference]: With dead ends: 3355 [2021-11-03 05:15:16,655 INFO L226 Difference]: Without dead ends: 2345 [2021-11-03 05:15:16,658 INFO L786 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 [2021-11-03 05:15:16,660 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2345 states. [2021-11-03 05:15:16,800 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2345 to 1689. [2021-11-03 05:15:16,804 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1689 states, 1688 states have (on average 1.5758293838862558) internal successors, (2660), 1688 states have internal predecessors, (2660), 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) [2021-11-03 05:15:16,811 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1689 states to 1689 states and 2660 transitions. [2021-11-03 05:15:16,811 INFO L78 Accepts]: Start accepts. Automaton has 1689 states and 2660 transitions. Word has length 49 [2021-11-03 05:15:16,811 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:15:16,811 INFO L470 AbstractCegarLoop]: Abstraction has 1689 states and 2660 transitions. [2021-11-03 05:15:16,812 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 9.8) internal successors, (49), 5 states have internal predecessors, (49), 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) [2021-11-03 05:15:16,812 INFO L276 IsEmpty]: Start isEmpty. Operand 1689 states and 2660 transitions. [2021-11-03 05:15:16,812 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-11-03 05:15:16,813 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:15:16,813 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:15:16,813 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-03 05:15:16,813 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:15:16,814 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:15:16,814 INFO L85 PathProgramCache]: Analyzing trace with hash 650487300, now seen corresponding path program 1 times [2021-11-03 05:15:16,814 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:15:16,814 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1058383251] [2021-11-03 05:15:16,815 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:15:16,815 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:15:16,831 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:15:16,860 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:15:16,861 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:15:16,861 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1058383251] [2021-11-03 05:15:16,861 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1058383251] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-03 05:15:16,861 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-03 05:15:16,862 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-03 05:15:16,862 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2116697074] [2021-11-03 05:15:16,862 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-03 05:15:16,863 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:15:16,863 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-03 05:15:16,863 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-03 05:15:16,864 INFO L87 Difference]: Start difference. First operand 1689 states and 2660 transitions. Second operand has 4 states, 4 states have (on average 12.5) internal successors, (50), 4 states have internal predecessors, (50), 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) [2021-11-03 05:15:17,056 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:15:17,056 INFO L93 Difference]: Finished difference Result 3970 states and 6251 transitions. [2021-11-03 05:15:17,056 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-03 05:15:17,057 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 12.5) internal successors, (50), 4 states have internal predecessors, (50), 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 50 [2021-11-03 05:15:17,057 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:15:17,070 INFO L225 Difference]: With dead ends: 3970 [2021-11-03 05:15:17,070 INFO L226 Difference]: Without dead ends: 2337 [2021-11-03 05:15:17,090 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-03 05:15:17,093 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2337 states. [2021-11-03 05:15:17,272 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2337 to 2335. [2021-11-03 05:15:17,278 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2335 states, 2334 states have (on average 1.5621251071122537) internal successors, (3646), 2334 states have internal predecessors, (3646), 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) [2021-11-03 05:15:17,289 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2335 states to 2335 states and 3646 transitions. [2021-11-03 05:15:17,289 INFO L78 Accepts]: Start accepts. Automaton has 2335 states and 3646 transitions. Word has length 50 [2021-11-03 05:15:17,290 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:15:17,290 INFO L470 AbstractCegarLoop]: Abstraction has 2335 states and 3646 transitions. [2021-11-03 05:15:17,290 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 12.5) internal successors, (50), 4 states have internal predecessors, (50), 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) [2021-11-03 05:15:17,290 INFO L276 IsEmpty]: Start isEmpty. Operand 2335 states and 3646 transitions. [2021-11-03 05:15:17,291 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-11-03 05:15:17,291 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:15:17,291 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:15:17,291 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-03 05:15:17,292 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:15:17,292 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:15:17,292 INFO L85 PathProgramCache]: Analyzing trace with hash -1367676345, now seen corresponding path program 1 times [2021-11-03 05:15:17,293 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:15:17,293 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1990418036] [2021-11-03 05:15:17,293 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:15:17,293 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:15:17,309 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:15:17,339 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:15:17,339 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:15:17,339 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1990418036] [2021-11-03 05:15:17,340 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1990418036] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-03 05:15:17,340 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-03 05:15:17,340 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-03 05:15:17,340 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1170313864] [2021-11-03 05:15:17,341 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-03 05:15:17,341 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:15:17,342 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-03 05:15:17,342 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-03 05:15:17,342 INFO L87 Difference]: Start difference. First operand 2335 states and 3646 transitions. Second operand has 4 states, 4 states have (on average 12.75) internal successors, (51), 4 states have internal predecessors, (51), 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) [2021-11-03 05:15:17,563 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:15:17,563 INFO L93 Difference]: Finished difference Result 4616 states and 7225 transitions. [2021-11-03 05:15:17,564 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-03 05:15:17,564 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 12.75) internal successors, (51), 4 states have internal predecessors, (51), 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 51 [2021-11-03 05:15:17,564 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:15:17,577 INFO L225 Difference]: With dead ends: 4616 [2021-11-03 05:15:17,578 INFO L226 Difference]: Without dead ends: 2337 [2021-11-03 05:15:17,581 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-03 05:15:17,584 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2337 states. [2021-11-03 05:15:17,749 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2337 to 2335. [2021-11-03 05:15:17,754 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2335 states, 2334 states have (on average 1.5548414738646101) internal successors, (3629), 2334 states have internal predecessors, (3629), 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) [2021-11-03 05:15:17,762 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2335 states to 2335 states and 3629 transitions. [2021-11-03 05:15:17,763 INFO L78 Accepts]: Start accepts. Automaton has 2335 states and 3629 transitions. Word has length 51 [2021-11-03 05:15:17,763 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:15:17,763 INFO L470 AbstractCegarLoop]: Abstraction has 2335 states and 3629 transitions. [2021-11-03 05:15:17,764 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 12.75) internal successors, (51), 4 states have internal predecessors, (51), 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) [2021-11-03 05:15:17,764 INFO L276 IsEmpty]: Start isEmpty. Operand 2335 states and 3629 transitions. [2021-11-03 05:15:17,764 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-11-03 05:15:17,764 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:15:17,765 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:15:17,765 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-11-03 05:15:17,765 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:15:17,765 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:15:17,766 INFO L85 PathProgramCache]: Analyzing trace with hash 498318123, now seen corresponding path program 1 times [2021-11-03 05:15:17,766 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:15:17,766 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [521653514] [2021-11-03 05:15:17,766 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:15:17,767 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:15:17,780 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:15:17,809 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:15:17,809 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:15:17,809 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [521653514] [2021-11-03 05:15:17,809 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [521653514] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-03 05:15:17,810 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-03 05:15:17,810 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-03 05:15:17,810 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [485899495] [2021-11-03 05:15:17,810 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-03 05:15:17,811 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:15:17,811 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-03 05:15:17,811 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-03 05:15:17,812 INFO L87 Difference]: Start difference. First operand 2335 states and 3629 transitions. Second operand has 4 states, 4 states have (on average 13.0) internal successors, (52), 4 states have internal predecessors, (52), 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) [2021-11-03 05:15:17,995 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:15:17,995 INFO L93 Difference]: Finished difference Result 4616 states and 7191 transitions. [2021-11-03 05:15:17,996 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-03 05:15:17,996 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 13.0) internal successors, (52), 4 states have internal predecessors, (52), 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 52 [2021-11-03 05:15:17,996 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:15:18,033 INFO L225 Difference]: With dead ends: 4616 [2021-11-03 05:15:18,033 INFO L226 Difference]: Without dead ends: 2337 [2021-11-03 05:15:18,036 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-03 05:15:18,039 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2337 states. [2021-11-03 05:15:18,180 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2337 to 2335. [2021-11-03 05:15:18,188 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2335 states, 2334 states have (on average 1.5475578406169666) internal successors, (3612), 2334 states have internal predecessors, (3612), 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) [2021-11-03 05:15:18,196 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2335 states to 2335 states and 3612 transitions. [2021-11-03 05:15:18,197 INFO L78 Accepts]: Start accepts. Automaton has 2335 states and 3612 transitions. Word has length 52 [2021-11-03 05:15:18,197 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:15:18,197 INFO L470 AbstractCegarLoop]: Abstraction has 2335 states and 3612 transitions. [2021-11-03 05:15:18,197 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 13.0) internal successors, (52), 4 states have internal predecessors, (52), 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) [2021-11-03 05:15:18,197 INFO L276 IsEmpty]: Start isEmpty. Operand 2335 states and 3612 transitions. [2021-11-03 05:15:18,198 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-11-03 05:15:18,198 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:15:18,198 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:15:18,198 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-11-03 05:15:18,199 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:15:18,199 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:15:18,199 INFO L85 PathProgramCache]: Analyzing trace with hash 625035068, now seen corresponding path program 1 times [2021-11-03 05:15:18,199 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:15:18,201 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [397828698] [2021-11-03 05:15:18,202 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:15:18,202 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:15:18,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:15:18,357 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:15:18,357 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:15:18,357 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [397828698] [2021-11-03 05:15:18,357 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [397828698] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-03 05:15:18,358 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-03 05:15:18,358 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-03 05:15:18,358 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1608118091] [2021-11-03 05:15:18,358 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-03 05:15:18,358 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:15:18,360 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-03 05:15:18,361 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-03 05:15:18,361 INFO L87 Difference]: Start difference. First operand 2335 states and 3612 transitions. Second operand has 5 states, 5 states have (on average 10.8) internal successors, (54), 5 states have internal predecessors, (54), 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) [2021-11-03 05:15:18,675 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:15:18,675 INFO L93 Difference]: Finished difference Result 4616 states and 7157 transitions. [2021-11-03 05:15:18,675 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-03 05:15:18,676 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 10.8) internal successors, (54), 5 states have internal predecessors, (54), 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 54 [2021-11-03 05:15:18,676 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:15:18,689 INFO L225 Difference]: With dead ends: 4616 [2021-11-03 05:15:18,689 INFO L226 Difference]: Without dead ends: 2337 [2021-11-03 05:15:18,693 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=16, Unknown=0, NotChecked=0, Total=30 [2021-11-03 05:15:18,696 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2337 states. [2021-11-03 05:15:18,875 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2337 to 2335. [2021-11-03 05:15:18,881 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2335 states, 2334 states have (on average 1.5424164524421593) internal successors, (3600), 2334 states have internal predecessors, (3600), 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) [2021-11-03 05:15:18,907 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2335 states to 2335 states and 3600 transitions. [2021-11-03 05:15:18,908 INFO L78 Accepts]: Start accepts. Automaton has 2335 states and 3600 transitions. Word has length 54 [2021-11-03 05:15:18,908 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:15:18,908 INFO L470 AbstractCegarLoop]: Abstraction has 2335 states and 3600 transitions. [2021-11-03 05:15:18,908 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 10.8) internal successors, (54), 5 states have internal predecessors, (54), 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) [2021-11-03 05:15:18,908 INFO L276 IsEmpty]: Start isEmpty. Operand 2335 states and 3600 transitions. [2021-11-03 05:15:18,909 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-11-03 05:15:18,909 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:15:18,909 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:15:18,909 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-11-03 05:15:18,909 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:15:18,910 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:15:18,910 INFO L85 PathProgramCache]: Analyzing trace with hash -312065607, now seen corresponding path program 1 times [2021-11-03 05:15:18,910 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:15:18,910 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1097683452] [2021-11-03 05:15:18,910 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:15:18,911 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:15:18,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:15:19,034 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:15:19,034 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:15:19,034 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1097683452] [2021-11-03 05:15:19,035 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1097683452] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-03 05:15:19,035 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-03 05:15:19,035 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-03 05:15:19,035 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1206663050] [2021-11-03 05:15:19,036 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-03 05:15:19,036 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:15:19,036 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-03 05:15:19,036 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-03 05:15:19,037 INFO L87 Difference]: Start difference. First operand 2335 states and 3600 transitions. Second operand has 5 states, 5 states have (on average 11.4) internal successors, (57), 5 states have internal predecessors, (57), 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) [2021-11-03 05:15:19,410 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:15:19,411 INFO L93 Difference]: Finished difference Result 6001 states and 9244 transitions. [2021-11-03 05:15:19,412 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-03 05:15:19,412 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 11.4) internal successors, (57), 5 states have internal predecessors, (57), 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 57 [2021-11-03 05:15:19,412 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:15:19,434 INFO L225 Difference]: With dead ends: 6001 [2021-11-03 05:15:19,434 INFO L226 Difference]: Without dead ends: 3722 [2021-11-03 05:15:19,438 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=16, Unknown=0, NotChecked=0, Total=30 [2021-11-03 05:15:19,442 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3722 states. [2021-11-03 05:15:19,679 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3722 to 3720. [2021-11-03 05:15:19,688 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3720 states, 3719 states have (on average 1.531325625168056) internal successors, (5695), 3719 states have internal predecessors, (5695), 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) [2021-11-03 05:15:19,725 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3720 states to 3720 states and 5695 transitions. [2021-11-03 05:15:19,725 INFO L78 Accepts]: Start accepts. Automaton has 3720 states and 5695 transitions. Word has length 57 [2021-11-03 05:15:19,726 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:15:19,726 INFO L470 AbstractCegarLoop]: Abstraction has 3720 states and 5695 transitions. [2021-11-03 05:15:19,726 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 11.4) internal successors, (57), 5 states have internal predecessors, (57), 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) [2021-11-03 05:15:19,726 INFO L276 IsEmpty]: Start isEmpty. Operand 3720 states and 5695 transitions. [2021-11-03 05:15:19,727 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-11-03 05:15:19,727 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:15:19,727 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:15:19,727 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-11-03 05:15:19,727 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:15:19,728 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:15:19,728 INFO L85 PathProgramCache]: Analyzing trace with hash -1074717730, now seen corresponding path program 1 times [2021-11-03 05:15:19,728 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:15:19,728 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1944241539] [2021-11-03 05:15:19,729 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:15:19,729 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:15:19,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:15:19,840 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:15:19,840 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:15:19,840 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1944241539] [2021-11-03 05:15:19,841 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1944241539] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-03 05:15:19,841 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-03 05:15:19,841 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-03 05:15:19,841 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1725917464] [2021-11-03 05:15:19,842 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-03 05:15:19,842 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:15:19,842 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-03 05:15:19,843 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-03 05:15:19,843 INFO L87 Difference]: Start difference. First operand 3720 states and 5695 transitions. Second operand has 6 states, 6 states have (on average 9.666666666666666) internal successors, (58), 6 states have internal predecessors, (58), 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) [2021-11-03 05:15:20,339 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:15:20,339 INFO L93 Difference]: Finished difference Result 4775 states and 7255 transitions. [2021-11-03 05:15:20,340 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-03 05:15:20,340 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 9.666666666666666) internal successors, (58), 6 states have internal predecessors, (58), 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 58 [2021-11-03 05:15:20,340 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:15:20,369 INFO L225 Difference]: With dead ends: 4775 [2021-11-03 05:15:20,369 INFO L226 Difference]: Without dead ends: 4773 [2021-11-03 05:15:20,371 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2021-11-03 05:15:20,377 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4773 states. [2021-11-03 05:15:20,711 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4773 to 3734. [2021-11-03 05:15:20,720 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3734 states, 3733 states have (on average 1.5263862844896865) internal successors, (5698), 3733 states have internal predecessors, (5698), 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) [2021-11-03 05:15:20,732 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3734 states to 3734 states and 5698 transitions. [2021-11-03 05:15:20,732 INFO L78 Accepts]: Start accepts. Automaton has 3734 states and 5698 transitions. Word has length 58 [2021-11-03 05:15:20,732 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:15:20,733 INFO L470 AbstractCegarLoop]: Abstraction has 3734 states and 5698 transitions. [2021-11-03 05:15:20,733 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 9.666666666666666) internal successors, (58), 6 states have internal predecessors, (58), 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) [2021-11-03 05:15:20,733 INFO L276 IsEmpty]: Start isEmpty. Operand 3734 states and 5698 transitions. [2021-11-03 05:15:20,734 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-11-03 05:15:20,734 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:15:20,734 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:15:20,734 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2021-11-03 05:15:20,735 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:15:20,735 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:15:20,735 INFO L85 PathProgramCache]: Analyzing trace with hash -121591094, now seen corresponding path program 1 times [2021-11-03 05:15:20,735 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:15:20,735 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1416605754] [2021-11-03 05:15:20,736 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:15:20,736 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:15:20,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:15:21,295 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 3 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:15:21,296 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:15:21,296 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1416605754] [2021-11-03 05:15:21,296 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1416605754] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 05:15:21,296 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [424218560] [2021-11-03 05:15:21,296 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:15:21,297 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:15:21,297 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_70be7453-b122-496c-a835-5dd4cc5ecc8f/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 05:15:21,301 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_70be7453-b122-496c-a835-5dd4cc5ecc8f/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 05:15:21,306 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_70be7453-b122-496c-a835-5dd4cc5ecc8f/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-03 05:15:21,429 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:15:21,432 INFO L263 TraceCheckSpWp]: Trace formula consists of 351 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-03 05:15:21,439 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:15:22,347 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-03 05:15:22,347 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:15:22,803 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-03 05:15:22,803 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [424218560] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-03 05:15:22,804 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 2 imperfect interpolant sequences. [2021-11-03 05:15:22,804 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [13, 6] total 19 [2021-11-03 05:15:22,804 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [593104767] [2021-11-03 05:15:22,805 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-03 05:15:22,806 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:15:22,806 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-03 05:15:22,806 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=268, Unknown=0, NotChecked=0, Total=342 [2021-11-03 05:15:22,807 INFO L87 Difference]: Start difference. First operand 3734 states and 5698 transitions. Second operand has 5 states, 5 states have (on average 12.6) internal successors, (63), 4 states have internal predecessors, (63), 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) [2021-11-03 05:15:23,647 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:15:23,647 INFO L93 Difference]: Finished difference Result 10877 states and 16636 transitions. [2021-11-03 05:15:23,648 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-03 05:15:23,648 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 12.6) internal successors, (63), 4 states have internal predecessors, (63), 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 65 [2021-11-03 05:15:23,648 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:15:23,689 INFO L225 Difference]: With dead ends: 10877 [2021-11-03 05:15:23,690 INFO L226 Difference]: Without dead ends: 7184 [2021-11-03 05:15:23,696 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 143 GetRequests, 122 SyntacticMatches, 2 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 136 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=86, Invalid=334, Unknown=0, NotChecked=0, Total=420 [2021-11-03 05:15:23,706 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7184 states. [2021-11-03 05:15:24,452 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7184 to 7182. [2021-11-03 05:15:24,475 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7182 states, 7181 states have (on average 1.5209580838323353) internal successors, (10922), 7181 states have internal predecessors, (10922), 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) [2021-11-03 05:15:24,507 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7182 states to 7182 states and 10922 transitions. [2021-11-03 05:15:24,507 INFO L78 Accepts]: Start accepts. Automaton has 7182 states and 10922 transitions. Word has length 65 [2021-11-03 05:15:24,507 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:15:24,508 INFO L470 AbstractCegarLoop]: Abstraction has 7182 states and 10922 transitions. [2021-11-03 05:15:24,509 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 12.6) internal successors, (63), 4 states have internal predecessors, (63), 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) [2021-11-03 05:15:24,509 INFO L276 IsEmpty]: Start isEmpty. Operand 7182 states and 10922 transitions. [2021-11-03 05:15:24,516 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-11-03 05:15:24,516 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:15:24,516 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:15:24,556 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_70be7453-b122-496c-a835-5dd4cc5ecc8f/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-03 05:15:24,739 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_70be7453-b122-496c-a835-5dd4cc5ecc8f/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:15:24,739 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:15:24,740 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:15:24,740 INFO L85 PathProgramCache]: Analyzing trace with hash 902352775, now seen corresponding path program 1 times [2021-11-03 05:15:24,740 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:15:24,740 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [51039370] [2021-11-03 05:15:24,740 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:15:24,740 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:15:24,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:15:24,816 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-03 05:15:24,817 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:15:24,817 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [51039370] [2021-11-03 05:15:24,817 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [51039370] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-03 05:15:24,818 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-03 05:15:24,818 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-03 05:15:24,820 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1372011968] [2021-11-03 05:15:24,821 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-03 05:15:24,821 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:15:24,821 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-03 05:15:24,822 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-03 05:15:24,822 INFO L87 Difference]: Start difference. First operand 7182 states and 10922 transitions. Second operand has 5 states, 5 states have (on average 13.2) internal successors, (66), 4 states have internal predecessors, (66), 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) [2021-11-03 05:15:25,584 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:15:25,584 INFO L93 Difference]: Finished difference Result 14329 states and 21806 transitions. [2021-11-03 05:15:25,585 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-03 05:15:25,585 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 13.2) internal successors, (66), 4 states have internal predecessors, (66), 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 68 [2021-11-03 05:15:25,586 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:15:25,604 INFO L225 Difference]: With dead ends: 14329 [2021-11-03 05:15:25,604 INFO L226 Difference]: Without dead ends: 7182 [2021-11-03 05:15:25,615 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-11-03 05:15:25,624 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7182 states. [2021-11-03 05:15:26,220 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7182 to 7182. [2021-11-03 05:15:26,286 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7182 states, 7181 states have (on average 1.4951956552012255) internal successors, (10737), 7181 states have internal predecessors, (10737), 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) [2021-11-03 05:15:26,306 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7182 states to 7182 states and 10737 transitions. [2021-11-03 05:15:26,306 INFO L78 Accepts]: Start accepts. Automaton has 7182 states and 10737 transitions. Word has length 68 [2021-11-03 05:15:26,307 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:15:26,307 INFO L470 AbstractCegarLoop]: Abstraction has 7182 states and 10737 transitions. [2021-11-03 05:15:26,307 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 13.2) internal successors, (66), 4 states have internal predecessors, (66), 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) [2021-11-03 05:15:26,307 INFO L276 IsEmpty]: Start isEmpty. Operand 7182 states and 10737 transitions. [2021-11-03 05:15:26,308 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-11-03 05:15:26,308 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:15:26,309 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:15:26,309 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2021-11-03 05:15:26,309 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:15:26,310 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:15:26,310 INFO L85 PathProgramCache]: Analyzing trace with hash 331936194, now seen corresponding path program 1 times [2021-11-03 05:15:26,310 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:15:26,311 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [815270586] [2021-11-03 05:15:26,311 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:15:26,311 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:15:26,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:15:26,686 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-03 05:15:26,686 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:15:26,687 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [815270586] [2021-11-03 05:15:26,687 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [815270586] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 05:15:26,687 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1227543561] [2021-11-03 05:15:26,687 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:15:26,687 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:15:26,687 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_70be7453-b122-496c-a835-5dd4cc5ecc8f/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 05:15:26,691 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_70be7453-b122-496c-a835-5dd4cc5ecc8f/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 05:15:26,708 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_70be7453-b122-496c-a835-5dd4cc5ecc8f/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-03 05:15:26,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:15:26,897 INFO L263 TraceCheckSpWp]: Trace formula consists of 357 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-03 05:15:26,901 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:15:27,699 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-03 05:15:27,699 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:15:28,265 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-03 05:15:28,266 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1227543561] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-03 05:15:28,266 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 2 imperfect interpolant sequences. [2021-11-03 05:15:28,266 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [10, 6] total 16 [2021-11-03 05:15:28,266 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [304120830] [2021-11-03 05:15:28,267 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-03 05:15:28,267 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:15:28,267 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-03 05:15:28,268 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-03 05:15:28,268 INFO L87 Difference]: Start difference. First operand 7182 states and 10737 transitions. Second operand has 5 states, 5 states have (on average 13.2) internal successors, (66), 4 states have internal predecessors, (66), 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) [2021-11-03 05:15:29,822 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:15:29,822 INFO L93 Difference]: Finished difference Result 20852 states and 31207 transitions. [2021-11-03 05:15:29,823 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-03 05:15:29,823 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 13.2) internal successors, (66), 4 states have internal predecessors, (66), 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 68 [2021-11-03 05:15:29,823 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:15:29,854 INFO L225 Difference]: With dead ends: 20852 [2021-11-03 05:15:29,855 INFO L226 Difference]: Without dead ends: 13738 [2021-11-03 05:15:29,866 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 128 SyntacticMatches, 2 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 89 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=60, Invalid=246, Unknown=0, NotChecked=0, Total=306 [2021-11-03 05:15:29,883 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13738 states. [2021-11-03 05:15:30,946 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13738 to 13736. [2021-11-03 05:15:30,965 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13736 states, 13735 states have (on average 1.4860575172915909) internal successors, (20411), 13735 states have internal predecessors, (20411), 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) [2021-11-03 05:15:31,080 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13736 states to 13736 states and 20411 transitions. [2021-11-03 05:15:31,080 INFO L78 Accepts]: Start accepts. Automaton has 13736 states and 20411 transitions. Word has length 68 [2021-11-03 05:15:31,080 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:15:31,081 INFO L470 AbstractCegarLoop]: Abstraction has 13736 states and 20411 transitions. [2021-11-03 05:15:31,081 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 13.2) internal successors, (66), 4 states have internal predecessors, (66), 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) [2021-11-03 05:15:31,081 INFO L276 IsEmpty]: Start isEmpty. Operand 13736 states and 20411 transitions. [2021-11-03 05:15:31,082 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-11-03 05:15:31,082 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:15:31,083 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:15:31,118 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_70be7453-b122-496c-a835-5dd4cc5ecc8f/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-03 05:15:31,307 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_70be7453-b122-496c-a835-5dd4cc5ecc8f/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-11-03 05:15:31,307 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:15:31,308 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:15:31,308 INFO L85 PathProgramCache]: Analyzing trace with hash 1137176831, now seen corresponding path program 1 times [2021-11-03 05:15:31,308 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:15:31,308 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [868384370] [2021-11-03 05:15:31,308 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:15:31,308 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:15:31,353 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:15:31,410 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-03 05:15:31,410 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:15:31,410 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [868384370] [2021-11-03 05:15:31,411 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [868384370] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-03 05:15:31,411 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-03 05:15:31,411 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-03 05:15:31,411 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1447605141] [2021-11-03 05:15:31,412 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-03 05:15:31,412 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:15:31,413 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-03 05:15:31,413 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-03 05:15:31,413 INFO L87 Difference]: Start difference. First operand 13736 states and 20411 transitions. Second operand has 5 states, 5 states have (on average 13.8) internal successors, (69), 4 states have internal predecessors, (69), 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) [2021-11-03 05:15:32,645 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:15:32,646 INFO L93 Difference]: Finished difference Result 27416 states and 40756 transitions. [2021-11-03 05:15:32,646 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-03 05:15:32,646 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 13.8) internal successors, (69), 4 states have internal predecessors, (69), 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 71 [2021-11-03 05:15:32,647 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:15:32,680 INFO L225 Difference]: With dead ends: 27416 [2021-11-03 05:15:32,680 INFO L226 Difference]: Without dead ends: 13736 [2021-11-03 05:15:32,704 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-11-03 05:15:32,725 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13736 states. [2021-11-03 05:15:34,027 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13736 to 13736. [2021-11-03 05:15:34,045 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13736 states, 13735 states have (on average 1.4551874772479068) internal successors, (19987), 13735 states have internal predecessors, (19987), 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) [2021-11-03 05:15:34,072 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13736 states to 13736 states and 19987 transitions. [2021-11-03 05:15:34,073 INFO L78 Accepts]: Start accepts. Automaton has 13736 states and 19987 transitions. Word has length 71 [2021-11-03 05:15:34,073 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:15:34,073 INFO L470 AbstractCegarLoop]: Abstraction has 13736 states and 19987 transitions. [2021-11-03 05:15:34,073 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 13.8) internal successors, (69), 4 states have internal predecessors, (69), 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) [2021-11-03 05:15:34,074 INFO L276 IsEmpty]: Start isEmpty. Operand 13736 states and 19987 transitions. [2021-11-03 05:15:34,075 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-11-03 05:15:34,075 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:15:34,075 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:15:34,075 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2021-11-03 05:15:34,076 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:15:34,076 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:15:34,076 INFO L85 PathProgramCache]: Analyzing trace with hash -259779100, now seen corresponding path program 1 times [2021-11-03 05:15:34,077 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:15:34,077 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1001783825] [2021-11-03 05:15:34,077 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:15:34,077 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:15:34,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:15:34,402 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-03 05:15:34,402 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:15:34,402 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1001783825] [2021-11-03 05:15:34,402 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1001783825] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 05:15:34,402 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [917378319] [2021-11-03 05:15:34,403 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:15:34,403 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:15:34,403 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_70be7453-b122-496c-a835-5dd4cc5ecc8f/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 05:15:34,407 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_70be7453-b122-496c-a835-5dd4cc5ecc8f/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 05:15:34,427 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_70be7453-b122-496c-a835-5dd4cc5ecc8f/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-03 05:15:34,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:15:34,846 INFO L263 TraceCheckSpWp]: Trace formula consists of 363 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-03 05:15:34,849 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:15:35,686 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-03 05:15:35,688 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:15:36,250 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-03 05:15:36,251 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [917378319] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-03 05:15:36,251 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 2 imperfect interpolant sequences. [2021-11-03 05:15:36,251 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [10, 6] total 16 [2021-11-03 05:15:36,251 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [145621591] [2021-11-03 05:15:36,252 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-03 05:15:36,252 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:15:36,252 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-03 05:15:36,253 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-03 05:15:36,253 INFO L87 Difference]: Start difference. First operand 13736 states and 19987 transitions. Second operand has 5 states, 5 states have (on average 13.8) internal successors, (69), 4 states have internal predecessors, (69), 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) [2021-11-03 05:15:38,554 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:15:38,555 INFO L93 Difference]: Finished difference Result 40188 states and 58485 transitions. [2021-11-03 05:15:38,555 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-03 05:15:38,555 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 13.8) internal successors, (69), 4 states have internal predecessors, (69), 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 71 [2021-11-03 05:15:38,555 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:15:38,615 INFO L225 Difference]: With dead ends: 40188 [2021-11-03 05:15:38,616 INFO L226 Difference]: Without dead ends: 26530 [2021-11-03 05:15:38,788 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 152 GetRequests, 134 SyntacticMatches, 2 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 89 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=60, Invalid=246, Unknown=0, NotChecked=0, Total=306 [2021-11-03 05:15:38,817 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26530 states. [2021-11-03 05:15:41,814 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26530 to 26528. [2021-11-03 05:15:41,840 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26528 states, 26527 states have (on average 1.446488483431975) internal successors, (38371), 26527 states have internal predecessors, (38371), 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) [2021-11-03 05:15:41,899 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26528 states to 26528 states and 38371 transitions. [2021-11-03 05:15:41,899 INFO L78 Accepts]: Start accepts. Automaton has 26528 states and 38371 transitions. Word has length 71 [2021-11-03 05:15:41,900 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:15:41,900 INFO L470 AbstractCegarLoop]: Abstraction has 26528 states and 38371 transitions. [2021-11-03 05:15:41,900 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 13.8) internal successors, (69), 4 states have internal predecessors, (69), 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) [2021-11-03 05:15:41,900 INFO L276 IsEmpty]: Start isEmpty. Operand 26528 states and 38371 transitions. [2021-11-03 05:15:41,902 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-11-03 05:15:41,902 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:15:41,902 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:15:41,941 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_70be7453-b122-496c-a835-5dd4cc5ecc8f/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-03 05:15:42,119 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_70be7453-b122-496c-a835-5dd4cc5ecc8f/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-11-03 05:15:42,119 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:15:42,120 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:15:42,120 INFO L85 PathProgramCache]: Analyzing trace with hash -1396909514, now seen corresponding path program 1 times [2021-11-03 05:15:42,120 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:15:42,120 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [576745776] [2021-11-03 05:15:42,120 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:15:42,120 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:15:42,220 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:15:42,574 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-03 05:15:42,574 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:15:42,574 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [576745776] [2021-11-03 05:15:42,574 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [576745776] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 05:15:42,574 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1674486603] [2021-11-03 05:15:42,575 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:15:42,575 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:15:42,575 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_70be7453-b122-496c-a835-5dd4cc5ecc8f/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 05:15:42,576 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_70be7453-b122-496c-a835-5dd4cc5ecc8f/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 05:15:42,592 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_70be7453-b122-496c-a835-5dd4cc5ecc8f/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-03 05:15:42,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:15:42,956 INFO L263 TraceCheckSpWp]: Trace formula consists of 369 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-03 05:15:42,960 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:15:44,062 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-03 05:15:44,062 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:15:44,774 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-03 05:15:44,775 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1674486603] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-03 05:15:44,775 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 2 imperfect interpolant sequences. [2021-11-03 05:15:44,775 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [11, 7] total 20 [2021-11-03 05:15:44,775 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2069922043] [2021-11-03 05:15:44,776 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-03 05:15:44,776 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:15:44,776 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-03 05:15:44,776 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=310, Unknown=0, NotChecked=0, Total=380 [2021-11-03 05:15:44,777 INFO L87 Difference]: Start difference. First operand 26528 states and 38371 transitions. Second operand has 6 states, 6 states have (on average 12.0) internal successors, (72), 5 states have internal predecessors, (72), 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) [2021-11-03 05:15:48,189 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:15:48,189 INFO L93 Difference]: Finished difference Result 50150 states and 72193 transitions. [2021-11-03 05:15:48,190 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-03 05:15:48,190 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 12.0) internal successors, (72), 5 states have internal predecessors, (72), 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 74 [2021-11-03 05:15:48,190 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:15:48,245 INFO L225 Difference]: With dead ends: 50150 [2021-11-03 05:15:48,246 INFO L226 Difference]: Without dead ends: 36436 [2021-11-03 05:15:48,264 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 160 GetRequests, 138 SyntacticMatches, 1 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 134 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=96, Invalid=410, Unknown=0, NotChecked=0, Total=506 [2021-11-03 05:15:48,301 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36436 states. [2021-11-03 05:15:51,531 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36436 to 26550. [2021-11-03 05:15:51,551 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26550 states, 26549 states have (on average 1.4463068288824439) internal successors, (38398), 26549 states have internal predecessors, (38398), 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) [2021-11-03 05:15:51,594 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26550 states to 26550 states and 38398 transitions. [2021-11-03 05:15:51,594 INFO L78 Accepts]: Start accepts. Automaton has 26550 states and 38398 transitions. Word has length 74 [2021-11-03 05:15:51,595 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:15:51,595 INFO L470 AbstractCegarLoop]: Abstraction has 26550 states and 38398 transitions. [2021-11-03 05:15:51,595 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 12.0) internal successors, (72), 5 states have internal predecessors, (72), 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) [2021-11-03 05:15:51,595 INFO L276 IsEmpty]: Start isEmpty. Operand 26550 states and 38398 transitions. [2021-11-03 05:15:51,596 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-11-03 05:15:51,596 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:15:51,596 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:15:51,618 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_70be7453-b122-496c-a835-5dd4cc5ecc8f/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2021-11-03 05:15:51,797 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_70be7453-b122-496c-a835-5dd4cc5ecc8f/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:15:51,797 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:15:51,797 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:15:51,797 INFO L85 PathProgramCache]: Analyzing trace with hash -683962328, now seen corresponding path program 1 times [2021-11-03 05:15:51,798 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:15:51,798 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1800686548] [2021-11-03 05:15:51,798 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:15:51,798 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:15:51,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:15:52,102 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-03 05:15:52,102 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:15:52,102 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1800686548] [2021-11-03 05:15:52,102 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1800686548] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 05:15:52,102 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1041738131] [2021-11-03 05:15:52,103 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:15:52,103 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:15:52,103 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_70be7453-b122-496c-a835-5dd4cc5ecc8f/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 05:15:52,104 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_70be7453-b122-496c-a835-5dd4cc5ecc8f/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 05:15:52,131 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_70be7453-b122-496c-a835-5dd4cc5ecc8f/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-03 05:15:52,671 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:15:52,674 INFO L263 TraceCheckSpWp]: Trace formula consists of 369 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-03 05:15:52,676 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:15:53,811 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-03 05:15:53,811 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:15:54,444 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-03 05:15:54,444 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1041738131] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-03 05:15:54,444 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 2 imperfect interpolant sequences. [2021-11-03 05:15:54,445 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [10, 7] total 19 [2021-11-03 05:15:54,445 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1978071955] [2021-11-03 05:15:54,445 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-03 05:15:54,445 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:15:54,446 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-03 05:15:54,446 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=278, Unknown=0, NotChecked=0, Total=342 [2021-11-03 05:15:54,446 INFO L87 Difference]: Start difference. First operand 26550 states and 38398 transitions. Second operand has 6 states, 6 states have (on average 12.0) internal successors, (72), 5 states have internal predecessors, (72), 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) [2021-11-03 05:15:59,866 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:15:59,866 INFO L93 Difference]: Finished difference Result 62684 states and 90474 transitions. [2021-11-03 05:15:59,867 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-03 05:15:59,867 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 12.0) internal successors, (72), 5 states have internal predecessors, (72), 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 74 [2021-11-03 05:15:59,867 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:15:59,945 INFO L225 Difference]: With dead ends: 62684 [2021-11-03 05:15:59,946 INFO L226 Difference]: Without dead ends: 49026 [2021-11-03 05:15:59,962 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 159 GetRequests, 138 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 117 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=90, Invalid=372, Unknown=0, NotChecked=0, Total=462 [2021-11-03 05:16:00,014 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49026 states. [2021-11-03 05:16:04,481 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49026 to 39368. [2021-11-03 05:16:04,505 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39368 states, 39367 states have (on average 1.4322402011837325) internal successors, (56383), 39367 states have internal predecessors, (56383), 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) [2021-11-03 05:16:04,575 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39368 states to 39368 states and 56383 transitions. [2021-11-03 05:16:04,576 INFO L78 Accepts]: Start accepts. Automaton has 39368 states and 56383 transitions. Word has length 74 [2021-11-03 05:16:04,576 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:16:04,576 INFO L470 AbstractCegarLoop]: Abstraction has 39368 states and 56383 transitions. [2021-11-03 05:16:04,576 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 12.0) internal successors, (72), 5 states have internal predecessors, (72), 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) [2021-11-03 05:16:04,576 INFO L276 IsEmpty]: Start isEmpty. Operand 39368 states and 56383 transitions. [2021-11-03 05:16:04,578 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-11-03 05:16:04,579 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:16:04,579 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:16:04,608 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_70be7453-b122-496c-a835-5dd4cc5ecc8f/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-03 05:16:04,782 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_70be7453-b122-496c-a835-5dd4cc5ecc8f/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:16:04,782 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 05:16:04,782 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:16:04,783 INFO L85 PathProgramCache]: Analyzing trace with hash 2140204086, now seen corresponding path program 1 times [2021-11-03 05:16:04,783 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:16:04,783 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1202393203] [2021-11-03 05:16:04,783 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:16:04,783 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:16:04,867 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:16:05,117 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-03 05:16:05,118 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:16:05,118 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1202393203] [2021-11-03 05:16:05,118 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1202393203] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 05:16:05,118 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1442920589] [2021-11-03 05:16:05,118 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:16:05,118 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:16:05,119 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_70be7453-b122-496c-a835-5dd4cc5ecc8f/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 05:16:05,119 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_70be7453-b122-496c-a835-5dd4cc5ecc8f/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 05:16:05,141 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_70be7453-b122-496c-a835-5dd4cc5ecc8f/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-03 05:16:05,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:16:05,897 INFO L263 TraceCheckSpWp]: Trace formula consists of 369 conjuncts, 46 conjunts are in the unsatisfiable core [2021-11-03 05:16:05,907 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:16:07,457 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-03 05:16:07,457 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:16:14,449 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 3 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:16:14,449 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1442920589] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 05:16:14,449 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [368792285] [2021-11-03 05:16:14,471 INFO L159 IcfgInterpreter]: Started Sifa with 68 locations of interest [2021-11-03 05:16:14,471 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 05:16:14,476 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 05:16:14,481 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 05:16:14,482 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 05:16:14,838 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:16:14,840 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:16:14,841 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:16:14,842 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 12 [2021-11-03 05:16:14,843 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:16:14,843 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:16:14,844 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 12 [2021-11-03 05:16:14,848 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:16:14,849 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:16:14,849 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 12 [2021-11-03 05:16:14,850 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:16:14,851 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:16:14,851 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 49 [2021-11-03 05:16:14,877 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 772 [2021-11-03 05:16:14,895 WARN L137 XnfTransformerHelper]: expecting exponential blowup for input size 12 [2021-11-03 05:16:23,937 WARN L176 XnfTransformerHelper]: Simplifying disjunction of 262144 conjuctions. This might take some time...