./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/product-lines/elevator_spec9_product32.cil.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 839c364b Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb524a7c-3169-41a1-9cec-c542633b6551/bin/utaipan-eEHZpOm5b7/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb524a7c-3169-41a1-9cec-c542633b6551/bin/utaipan-eEHZpOm5b7/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb524a7c-3169-41a1-9cec-c542633b6551/bin/utaipan-eEHZpOm5b7/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb524a7c-3169-41a1-9cec-c542633b6551/bin/utaipan-eEHZpOm5b7/config/TaipanReach.xml -i ../../sv-benchmarks/c/product-lines/elevator_spec9_product32.cil.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb524a7c-3169-41a1-9cec-c542633b6551/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb524a7c-3169-41a1-9cec-c542633b6551/bin/utaipan-eEHZpOm5b7 --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 6f20249a191004f50add5285446ee5ffba043f1ff9b40e0e115c641082e595e2 --- Real Ultimate output --- This is Ultimate 0.2.2-hotfix-svcomp22-839c364 [2021-11-25 18:51:29,498 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-25 18:51:29,500 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-25 18:51:29,548 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-25 18:51:29,548 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-25 18:51:29,552 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-25 18:51:29,554 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-25 18:51:29,558 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-25 18:51:29,562 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-25 18:51:29,567 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-25 18:51:29,568 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-25 18:51:29,571 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-25 18:51:29,571 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-25 18:51:29,575 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-25 18:51:29,578 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-25 18:51:29,589 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-25 18:51:29,591 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-25 18:51:29,592 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-25 18:51:29,594 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-25 18:51:29,597 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-25 18:51:29,599 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-25 18:51:29,601 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-25 18:51:29,602 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-25 18:51:29,603 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-25 18:51:29,607 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-25 18:51:29,608 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-25 18:51:29,608 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-25 18:51:29,609 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-25 18:51:29,610 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-25 18:51:29,611 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-25 18:51:29,612 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-25 18:51:29,613 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-25 18:51:29,614 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-25 18:51:29,615 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-25 18:51:29,616 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-25 18:51:29,617 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-25 18:51:29,618 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-25 18:51:29,618 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-25 18:51:29,618 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-25 18:51:29,620 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-25 18:51:29,620 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-25 18:51:29,621 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb524a7c-3169-41a1-9cec-c542633b6551/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-25 18:51:29,653 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-25 18:51:29,653 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-25 18:51:29,654 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-25 18:51:29,654 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-25 18:51:29,655 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-25 18:51:29,655 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-25 18:51:29,655 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-25 18:51:29,655 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-25 18:51:29,655 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-25 18:51:29,656 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-25 18:51:29,656 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-25 18:51:29,656 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-25 18:51:29,656 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-25 18:51:29,656 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-25 18:51:29,657 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-25 18:51:29,657 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-25 18:51:29,657 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-25 18:51:29,657 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-25 18:51:29,658 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-25 18:51:29,658 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-25 18:51:29,658 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-25 18:51:29,659 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-25 18:51:29,659 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-25 18:51:29,659 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-25 18:51:29,659 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-25 18:51:29,659 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-25 18:51:29,660 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-25 18:51:29,660 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-25 18:51:29,660 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-25 18:51:29,660 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-25 18:51:29,660 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-25 18:51:29,661 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-25 18:51:29,661 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 18:51:29,661 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-25 18:51:29,661 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-25 18:51:29,661 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-25 18:51:29,662 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-25 18:51:29,662 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-25 18:51:29,662 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-25 18:51:29,662 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-25 18:51:29,662 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-25 18:51:29,663 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_cb524a7c-3169-41a1-9cec-c542633b6551/bin/utaipan-eEHZpOm5b7/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb524a7c-3169-41a1-9cec-c542633b6551/bin/utaipan-eEHZpOm5b7 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 6f20249a191004f50add5285446ee5ffba043f1ff9b40e0e115c641082e595e2 [2021-11-25 18:51:29,925 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-25 18:51:29,964 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-25 18:51:29,966 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-25 18:51:29,968 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-25 18:51:29,969 INFO L275 PluginConnector]: CDTParser initialized [2021-11-25 18:51:29,970 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb524a7c-3169-41a1-9cec-c542633b6551/bin/utaipan-eEHZpOm5b7/../../sv-benchmarks/c/product-lines/elevator_spec9_product32.cil.c [2021-11-25 18:51:30,071 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb524a7c-3169-41a1-9cec-c542633b6551/bin/utaipan-eEHZpOm5b7/data/82d87ddda/6aab3804f2824fd58314213d9c9c280f/FLAG387c074a8 [2021-11-25 18:51:30,691 INFO L306 CDTParser]: Found 1 translation units. [2021-11-25 18:51:30,692 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb524a7c-3169-41a1-9cec-c542633b6551/sv-benchmarks/c/product-lines/elevator_spec9_product32.cil.c [2021-11-25 18:51:30,716 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb524a7c-3169-41a1-9cec-c542633b6551/bin/utaipan-eEHZpOm5b7/data/82d87ddda/6aab3804f2824fd58314213d9c9c280f/FLAG387c074a8 [2021-11-25 18:51:30,910 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb524a7c-3169-41a1-9cec-c542633b6551/bin/utaipan-eEHZpOm5b7/data/82d87ddda/6aab3804f2824fd58314213d9c9c280f [2021-11-25 18:51:30,913 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-25 18:51:30,915 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-25 18:51:30,917 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-25 18:51:30,917 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-25 18:51:30,921 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-25 18:51:30,925 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 06:51:30" (1/1) ... [2021-11-25 18:51:30,926 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5e0f5fec and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:51:30, skipping insertion in model container [2021-11-25 18:51:30,928 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 06:51:30" (1/1) ... [2021-11-25 18:51:30,936 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-25 18:51:31,019 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-25 18:51:31,312 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb524a7c-3169-41a1-9cec-c542633b6551/sv-benchmarks/c/product-lines/elevator_spec9_product32.cil.c[17414,17427] [2021-11-25 18:51:31,661 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 18:51:31,673 INFO L203 MainTranslator]: Completed pre-run [2021-11-25 18:51:31,708 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb524a7c-3169-41a1-9cec-c542633b6551/sv-benchmarks/c/product-lines/elevator_spec9_product32.cil.c[17414,17427] [2021-11-25 18:51:31,787 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 18:51:31,826 INFO L208 MainTranslator]: Completed translation [2021-11-25 18:51:31,827 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:51:31 WrapperNode [2021-11-25 18:51:31,827 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-25 18:51:31,828 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-25 18:51:31,829 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-25 18:51:31,829 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-25 18:51:31,837 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:51:31" (1/1) ... [2021-11-25 18:51:31,881 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:51:31" (1/1) ... [2021-11-25 18:51:31,948 INFO L137 Inliner]: procedures = 99, calls = 352, calls flagged for inlining = 28, calls inlined = 24, statements flattened = 934 [2021-11-25 18:51:31,948 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-25 18:51:31,949 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-25 18:51:31,949 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-25 18:51:31,949 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-25 18:51:31,981 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:51:31" (1/1) ... [2021-11-25 18:51:31,981 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:51:31" (1/1) ... [2021-11-25 18:51:31,988 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:51:31" (1/1) ... [2021-11-25 18:51:31,989 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:51:31" (1/1) ... [2021-11-25 18:51:32,031 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:51:31" (1/1) ... [2021-11-25 18:51:32,051 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:51:31" (1/1) ... [2021-11-25 18:51:32,056 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:51:31" (1/1) ... [2021-11-25 18:51:32,066 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-25 18:51:32,067 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-25 18:51:32,067 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-25 18:51:32,067 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-25 18:51:32,068 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:51:31" (1/1) ... [2021-11-25 18:51:32,086 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 18:51:32,113 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb524a7c-3169-41a1-9cec-c542633b6551/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:51:32,142 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb524a7c-3169-41a1-9cec-c542633b6551/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-25 18:51:32,189 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb524a7c-3169-41a1-9cec-c542633b6551/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-25 18:51:32,209 INFO L130 BoogieDeclarations]: Found specification of procedure bigMacCall [2021-11-25 18:51:32,210 INFO L138 BoogieDeclarations]: Found implementation of procedure bigMacCall [2021-11-25 18:51:32,210 INFO L130 BoogieDeclarations]: Found specification of procedure enterElevator [2021-11-25 18:51:32,210 INFO L138 BoogieDeclarations]: Found implementation of procedure enterElevator [2021-11-25 18:51:32,211 INFO L130 BoogieDeclarations]: Found specification of procedure stopRequestedInDirection [2021-11-25 18:51:32,211 INFO L138 BoogieDeclarations]: Found implementation of procedure stopRequestedInDirection [2021-11-25 18:51:32,211 INFO L130 BoogieDeclarations]: Found specification of procedure stopRequestedInDirection__wrappee__empty [2021-11-25 18:51:32,211 INFO L138 BoogieDeclarations]: Found implementation of procedure stopRequestedInDirection__wrappee__empty [2021-11-25 18:51:32,211 INFO L130 BoogieDeclarations]: Found specification of procedure timeShift [2021-11-25 18:51:32,212 INFO L138 BoogieDeclarations]: Found implementation of procedure timeShift [2021-11-25 18:51:32,212 INFO L130 BoogieDeclarations]: Found specification of procedure getDestination [2021-11-25 18:51:32,212 INFO L138 BoogieDeclarations]: Found implementation of procedure getDestination [2021-11-25 18:51:32,212 INFO L130 BoogieDeclarations]: Found specification of procedure isBlocked [2021-11-25 18:51:32,212 INFO L138 BoogieDeclarations]: Found implementation of procedure isBlocked [2021-11-25 18:51:32,213 INFO L130 BoogieDeclarations]: Found specification of procedure getCurrentFloorID [2021-11-25 18:51:32,213 INFO L138 BoogieDeclarations]: Found implementation of procedure getCurrentFloorID [2021-11-25 18:51:32,214 INFO L130 BoogieDeclarations]: Found specification of procedure buttonForFloorIsPressed [2021-11-25 18:51:32,214 INFO L138 BoogieDeclarations]: Found implementation of procedure buttonForFloorIsPressed [2021-11-25 18:51:32,214 INFO L130 BoogieDeclarations]: Found specification of procedure pressInLiftFloorButton [2021-11-25 18:51:32,214 INFO L138 BoogieDeclarations]: Found implementation of procedure pressInLiftFloorButton [2021-11-25 18:51:32,214 INFO L130 BoogieDeclarations]: Found specification of procedure leaveElevator [2021-11-25 18:51:32,214 INFO L138 BoogieDeclarations]: Found implementation of procedure leaveElevator [2021-11-25 18:51:32,215 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-25 18:51:32,215 INFO L130 BoogieDeclarations]: Found specification of procedure stopRequestedAtCurrentFloor__wrappee__twothirdsfull [2021-11-25 18:51:32,215 INFO L138 BoogieDeclarations]: Found implementation of procedure stopRequestedAtCurrentFloor__wrappee__twothirdsfull [2021-11-25 18:51:32,215 INFO L130 BoogieDeclarations]: Found specification of procedure getWeight [2021-11-25 18:51:32,215 INFO L138 BoogieDeclarations]: Found implementation of procedure getWeight [2021-11-25 18:51:32,216 INFO L130 BoogieDeclarations]: Found specification of procedure isExecutiveFloorCalling [2021-11-25 18:51:32,216 INFO L138 BoogieDeclarations]: Found implementation of procedure isExecutiveFloorCalling [2021-11-25 18:51:32,216 INFO L130 BoogieDeclarations]: Found specification of procedure getReverseHeading [2021-11-25 18:51:32,216 INFO L138 BoogieDeclarations]: Found implementation of procedure getReverseHeading [2021-11-25 18:51:32,218 INFO L130 BoogieDeclarations]: Found specification of procedure cleanup [2021-11-25 18:51:32,218 INFO L138 BoogieDeclarations]: Found implementation of procedure cleanup [2021-11-25 18:51:32,218 INFO L130 BoogieDeclarations]: Found specification of procedure areDoorsOpen [2021-11-25 18:51:32,218 INFO L138 BoogieDeclarations]: Found implementation of procedure areDoorsOpen [2021-11-25 18:51:32,218 INFO L130 BoogieDeclarations]: Found specification of procedure __automaton_fail [2021-11-25 18:51:32,219 INFO L138 BoogieDeclarations]: Found implementation of procedure __automaton_fail [2021-11-25 18:51:32,219 INFO L130 BoogieDeclarations]: Found specification of procedure isTopFloor [2021-11-25 18:51:32,219 INFO L138 BoogieDeclarations]: Found implementation of procedure isTopFloor [2021-11-25 18:51:32,219 INFO L130 BoogieDeclarations]: Found specification of procedure resetCallOnFloor [2021-11-25 18:51:32,220 INFO L138 BoogieDeclarations]: Found implementation of procedure resetCallOnFloor [2021-11-25 18:51:32,220 INFO L130 BoogieDeclarations]: Found specification of procedure initPersonOnFloor [2021-11-25 18:51:32,220 INFO L138 BoogieDeclarations]: Found implementation of procedure initPersonOnFloor [2021-11-25 18:51:32,220 INFO L130 BoogieDeclarations]: Found specification of procedure removePersonFromFloor [2021-11-25 18:51:32,221 INFO L138 BoogieDeclarations]: Found implementation of procedure removePersonFromFloor [2021-11-25 18:51:32,221 INFO L130 BoogieDeclarations]: Found specification of procedure getOrigin [2021-11-25 18:51:32,221 INFO L138 BoogieDeclarations]: Found implementation of procedure getOrigin [2021-11-25 18:51:32,222 INFO L130 BoogieDeclarations]: Found specification of procedure continueInDirection [2021-11-25 18:51:32,223 INFO L138 BoogieDeclarations]: Found implementation of procedure continueInDirection [2021-11-25 18:51:32,223 INFO L130 BoogieDeclarations]: Found specification of procedure isEmpty [2021-11-25 18:51:32,223 INFO L138 BoogieDeclarations]: Found implementation of procedure isEmpty [2021-11-25 18:51:32,223 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-25 18:51:32,224 INFO L130 BoogieDeclarations]: Found specification of procedure isPersonOnFloor [2021-11-25 18:51:32,224 INFO L138 BoogieDeclarations]: Found implementation of procedure isPersonOnFloor [2021-11-25 18:51:32,224 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-25 18:51:32,224 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-25 18:51:32,225 INFO L130 BoogieDeclarations]: Found specification of procedure isFloorCalling [2021-11-25 18:51:32,225 INFO L138 BoogieDeclarations]: Found implementation of procedure isFloorCalling [2021-11-25 18:51:32,225 INFO L130 BoogieDeclarations]: Found specification of procedure timeShift__wrappee__executivefloor [2021-11-25 18:51:32,226 INFO L138 BoogieDeclarations]: Found implementation of procedure timeShift__wrappee__executivefloor [2021-11-25 18:51:32,419 INFO L236 CfgBuilder]: Building ICFG [2021-11-25 18:51:32,421 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-25 18:51:33,772 INFO L277 CfgBuilder]: Performing block encoding [2021-11-25 18:51:34,378 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-25 18:51:34,379 INFO L301 CfgBuilder]: Removed 1 assume(true) statements. [2021-11-25 18:51:34,384 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 06:51:34 BoogieIcfgContainer [2021-11-25 18:51:34,385 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-25 18:51:34,387 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-25 18:51:34,387 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-25 18:51:34,391 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-25 18:51:34,392 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 06:51:30" (1/3) ... [2021-11-25 18:51:34,393 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@623bf1d0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 06:51:34, skipping insertion in model container [2021-11-25 18:51:34,393 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:51:31" (2/3) ... [2021-11-25 18:51:34,394 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@623bf1d0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 06:51:34, skipping insertion in model container [2021-11-25 18:51:34,395 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 06:51:34" (3/3) ... [2021-11-25 18:51:34,396 INFO L111 eAbstractionObserver]: Analyzing ICFG elevator_spec9_product32.cil.c [2021-11-25 18:51:34,406 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-25 18:51:34,406 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-25 18:51:34,479 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-25 18:51:34,489 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-25 18:51:34,490 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-25 18:51:34,546 INFO L276 IsEmpty]: Start isEmpty. Operand has 401 states, 268 states have (on average 1.5671641791044777) internal successors, (420), 291 states have internal predecessors, (420), 103 states have call successors, (103), 28 states have call predecessors, (103), 28 states have return successors, (103), 96 states have call predecessors, (103), 103 states have call successors, (103) [2021-11-25 18:51:34,562 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-11-25 18:51:34,563 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:51:34,564 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:51:34,564 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:51:34,571 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:51:34,572 INFO L85 PathProgramCache]: Analyzing trace with hash 1796047711, now seen corresponding path program 1 times [2021-11-25 18:51:34,584 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:51:34,585 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1815517675] [2021-11-25 18:51:34,585 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:51:34,586 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:51:34,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:51:35,068 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:51:35,071 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:51:35,071 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1815517675] [2021-11-25 18:51:35,072 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1815517675] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:51:35,073 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:51:35,073 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-25 18:51:35,075 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [160896345] [2021-11-25 18:51:35,075 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:51:35,080 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-25 18:51:35,080 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:51:35,108 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-25 18:51:35,109 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-25 18:51:35,112 INFO L87 Difference]: Start difference. First operand has 401 states, 268 states have (on average 1.5671641791044777) internal successors, (420), 291 states have internal predecessors, (420), 103 states have call successors, (103), 28 states have call predecessors, (103), 28 states have return successors, (103), 96 states have call predecessors, (103), 103 states have call successors, (103) Second operand has 2 states, 2 states have (on average 13.0) internal successors, (26), 2 states have internal predecessors, (26), 2 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 2 states have call predecessors, (8), 1 states have call successors, (8) [2021-11-25 18:51:35,314 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:51:35,314 INFO L93 Difference]: Finished difference Result 419 states and 653 transitions. [2021-11-25 18:51:35,316 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-25 18:51:35,317 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 13.0) internal successors, (26), 2 states have internal predecessors, (26), 2 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 2 states have call predecessors, (8), 1 states have call successors, (8) Word has length 43 [2021-11-25 18:51:35,318 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:51:35,337 INFO L225 Difference]: With dead ends: 419 [2021-11-25 18:51:35,337 INFO L226 Difference]: Without dead ends: 397 [2021-11-25 18:51:35,341 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-25 18:51:35,345 INFO L933 BasicCegarLoop]: 579 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 40 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 579 SdHoareTripleChecker+Invalid, 40 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 40 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:51:35,346 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 579 Invalid, 40 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 40 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:51:35,364 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 397 states. [2021-11-25 18:51:35,425 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 397 to 397. [2021-11-25 18:51:35,437 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 397 states, 266 states have (on average 1.556390977443609) internal successors, (414), 287 states have internal predecessors, (414), 103 states have call successors, (103), 28 states have call predecessors, (103), 27 states have return successors, (98), 95 states have call predecessors, (98), 98 states have call successors, (98) [2021-11-25 18:51:35,489 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 397 states to 397 states and 615 transitions. [2021-11-25 18:51:35,491 INFO L78 Accepts]: Start accepts. Automaton has 397 states and 615 transitions. Word has length 43 [2021-11-25 18:51:35,492 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:51:35,493 INFO L470 AbstractCegarLoop]: Abstraction has 397 states and 615 transitions. [2021-11-25 18:51:35,493 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 13.0) internal successors, (26), 2 states have internal predecessors, (26), 2 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 2 states have call predecessors, (8), 1 states have call successors, (8) [2021-11-25 18:51:35,493 INFO L276 IsEmpty]: Start isEmpty. Operand 397 states and 615 transitions. [2021-11-25 18:51:35,504 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-11-25 18:51:35,504 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:51:35,504 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:51:35,505 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-25 18:51:35,506 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:51:35,507 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:51:35,508 INFO L85 PathProgramCache]: Analyzing trace with hash 1427098797, now seen corresponding path program 1 times [2021-11-25 18:51:35,508 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:51:35,509 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1200161770] [2021-11-25 18:51:35,509 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:51:35,510 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:51:35,590 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:51:35,760 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:51:35,760 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:51:35,761 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1200161770] [2021-11-25 18:51:35,761 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1200161770] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:51:35,761 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:51:35,761 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-25 18:51:35,762 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [226637554] [2021-11-25 18:51:35,762 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:51:35,764 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-25 18:51:35,765 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:51:35,765 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-25 18:51:35,766 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-25 18:51:35,766 INFO L87 Difference]: Start difference. First operand 397 states and 615 transitions. Second operand has 6 states, 6 states have (on average 4.5) internal successors, (27), 6 states have internal predecessors, (27), 6 states have call successors, (9), 4 states have call predecessors, (9), 2 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) [2021-11-25 18:51:37,892 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:51:37,893 INFO L93 Difference]: Finished difference Result 1279 states and 2019 transitions. [2021-11-25 18:51:37,893 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-25 18:51:37,894 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.5) internal successors, (27), 6 states have internal predecessors, (27), 6 states have call successors, (9), 4 states have call predecessors, (9), 2 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) Word has length 44 [2021-11-25 18:51:37,894 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:51:37,907 INFO L225 Difference]: With dead ends: 1279 [2021-11-25 18:51:37,908 INFO L226 Difference]: Without dead ends: 898 [2021-11-25 18:51:37,919 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-11-25 18:51:37,922 INFO L933 BasicCegarLoop]: 581 mSDtfsCounter, 2009 mSDsluCounter, 520 mSDsCounter, 0 mSdLazyCounter, 1274 mSolverCounterSat, 828 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2080 SdHoareTripleChecker+Valid, 1074 SdHoareTripleChecker+Invalid, 2102 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 828 IncrementalHoareTripleChecker+Valid, 1274 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.9s IncrementalHoareTripleChecker+Time [2021-11-25 18:51:37,923 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2080 Valid, 1074 Invalid, 2102 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [828 Valid, 1274 Invalid, 0 Unknown, 0 Unchecked, 1.9s Time] [2021-11-25 18:51:37,927 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 898 states. [2021-11-25 18:51:38,041 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 898 to 801. [2021-11-25 18:51:38,044 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 801 states, 556 states have (on average 1.5719424460431655) internal successors, (874), 586 states have internal predecessors, (874), 193 states have call successors, (193), 50 states have call predecessors, (193), 51 states have return successors, (195), 177 states have call predecessors, (195), 188 states have call successors, (195) [2021-11-25 18:51:38,054 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 801 states to 801 states and 1262 transitions. [2021-11-25 18:51:38,055 INFO L78 Accepts]: Start accepts. Automaton has 801 states and 1262 transitions. Word has length 44 [2021-11-25 18:51:38,055 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:51:38,057 INFO L470 AbstractCegarLoop]: Abstraction has 801 states and 1262 transitions. [2021-11-25 18:51:38,057 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 4.5) internal successors, (27), 6 states have internal predecessors, (27), 6 states have call successors, (9), 4 states have call predecessors, (9), 2 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) [2021-11-25 18:51:38,057 INFO L276 IsEmpty]: Start isEmpty. Operand 801 states and 1262 transitions. [2021-11-25 18:51:38,066 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2021-11-25 18:51:38,066 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:51:38,067 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:51:38,067 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-25 18:51:38,067 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:51:38,068 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:51:38,068 INFO L85 PathProgramCache]: Analyzing trace with hash 442798330, now seen corresponding path program 1 times [2021-11-25 18:51:38,068 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:51:38,068 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1051379542] [2021-11-25 18:51:38,068 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:51:38,069 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:51:38,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:51:38,245 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-25 18:51:38,245 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:51:38,246 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1051379542] [2021-11-25 18:51:38,246 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1051379542] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:51:38,246 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:51:38,246 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-11-25 18:51:38,247 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [209053785] [2021-11-25 18:51:38,247 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:51:38,247 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-25 18:51:38,248 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:51:38,248 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-25 18:51:38,248 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2021-11-25 18:51:38,249 INFO L87 Difference]: Start difference. First operand 801 states and 1262 transitions. Second operand has 9 states, 7 states have (on average 6.714285714285714) internal successors, (47), 8 states have internal predecessors, (47), 5 states have call successors, (17), 3 states have call predecessors, (17), 3 states have return successors, (16), 5 states have call predecessors, (16), 4 states have call successors, (16) [2021-11-25 18:51:41,289 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:51:41,289 INFO L93 Difference]: Finished difference Result 2368 states and 3741 transitions. [2021-11-25 18:51:41,290 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-25 18:51:41,290 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 7 states have (on average 6.714285714285714) internal successors, (47), 8 states have internal predecessors, (47), 5 states have call successors, (17), 3 states have call predecessors, (17), 3 states have return successors, (16), 5 states have call predecessors, (16), 4 states have call successors, (16) Word has length 87 [2021-11-25 18:51:41,290 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:51:41,303 INFO L225 Difference]: With dead ends: 2368 [2021-11-25 18:51:41,303 INFO L226 Difference]: Without dead ends: 1583 [2021-11-25 18:51:41,309 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 83 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=90, Invalid=416, Unknown=0, NotChecked=0, Total=506 [2021-11-25 18:51:41,311 INFO L933 BasicCegarLoop]: 963 mSDtfsCounter, 989 mSDsluCounter, 2147 mSDsCounter, 0 mSdLazyCounter, 4739 mSolverCounterSat, 404 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1060 SdHoareTripleChecker+Valid, 2998 SdHoareTripleChecker+Invalid, 5143 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 404 IncrementalHoareTripleChecker+Valid, 4739 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.7s IncrementalHoareTripleChecker+Time [2021-11-25 18:51:41,311 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1060 Valid, 2998 Invalid, 5143 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [404 Valid, 4739 Invalid, 0 Unknown, 0 Unchecked, 2.7s Time] [2021-11-25 18:51:41,314 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1583 states. [2021-11-25 18:51:41,407 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1583 to 1555. [2021-11-25 18:51:41,411 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1555 states, 1075 states have (on average 1.5562790697674418) internal successors, (1673), 1126 states have internal predecessors, (1673), 378 states have call successors, (378), 90 states have call predecessors, (378), 101 states have return successors, (397), 360 states have call predecessors, (397), 373 states have call successors, (397) [2021-11-25 18:51:41,429 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1555 states to 1555 states and 2448 transitions. [2021-11-25 18:51:41,429 INFO L78 Accepts]: Start accepts. Automaton has 1555 states and 2448 transitions. Word has length 87 [2021-11-25 18:51:41,430 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:51:41,430 INFO L470 AbstractCegarLoop]: Abstraction has 1555 states and 2448 transitions. [2021-11-25 18:51:41,430 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 7 states have (on average 6.714285714285714) internal successors, (47), 8 states have internal predecessors, (47), 5 states have call successors, (17), 3 states have call predecessors, (17), 3 states have return successors, (16), 5 states have call predecessors, (16), 4 states have call successors, (16) [2021-11-25 18:51:41,430 INFO L276 IsEmpty]: Start isEmpty. Operand 1555 states and 2448 transitions. [2021-11-25 18:51:41,434 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2021-11-25 18:51:41,434 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:51:41,434 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:51:41,434 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-25 18:51:41,435 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:51:41,435 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:51:41,435 INFO L85 PathProgramCache]: Analyzing trace with hash 96065586, now seen corresponding path program 1 times [2021-11-25 18:51:41,435 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:51:41,435 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [707095576] [2021-11-25 18:51:41,436 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:51:41,436 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:51:41,482 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:51:41,623 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-25 18:51:41,623 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:51:41,623 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [707095576] [2021-11-25 18:51:41,623 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [707095576] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:51:41,623 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:51:41,624 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-25 18:51:41,624 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1405980948] [2021-11-25 18:51:41,624 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:51:41,624 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-25 18:51:41,625 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:51:41,625 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-25 18:51:41,625 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-25 18:51:41,626 INFO L87 Difference]: Start difference. First operand 1555 states and 2448 transitions. Second operand has 7 states, 7 states have (on average 6.857142857142857) internal successors, (48), 7 states have internal predecessors, (48), 5 states have call successors, (17), 3 states have call predecessors, (17), 3 states have return successors, (16), 5 states have call predecessors, (16), 4 states have call successors, (16) [2021-11-25 18:51:43,709 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:51:43,709 INFO L93 Difference]: Finished difference Result 4007 states and 6318 transitions. [2021-11-25 18:51:43,710 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-25 18:51:43,710 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 6.857142857142857) internal successors, (48), 7 states have internal predecessors, (48), 5 states have call successors, (17), 3 states have call predecessors, (17), 3 states have return successors, (16), 5 states have call predecessors, (16), 4 states have call successors, (16) Word has length 88 [2021-11-25 18:51:43,711 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:51:43,739 INFO L225 Difference]: With dead ends: 4007 [2021-11-25 18:51:43,740 INFO L226 Difference]: Without dead ends: 2470 [2021-11-25 18:51:43,753 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=35, Invalid=97, Unknown=0, NotChecked=0, Total=132 [2021-11-25 18:51:43,764 INFO L933 BasicCegarLoop]: 601 mSDtfsCounter, 1166 mSDsluCounter, 1242 mSDsCounter, 0 mSdLazyCounter, 2358 mSolverCounterSat, 476 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1243 SdHoareTripleChecker+Valid, 1768 SdHoareTripleChecker+Invalid, 2834 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 476 IncrementalHoareTripleChecker+Valid, 2358 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.8s IncrementalHoareTripleChecker+Time [2021-11-25 18:51:43,766 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1243 Valid, 1768 Invalid, 2834 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [476 Valid, 2358 Invalid, 0 Unknown, 0 Unchecked, 1.8s Time] [2021-11-25 18:51:43,771 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2470 states. [2021-11-25 18:51:43,948 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2470 to 2397. [2021-11-25 18:51:43,954 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2397 states, 1667 states have (on average 1.5590881823635272) internal successors, (2599), 1745 states have internal predecessors, (2599), 563 states have call successors, (563), 147 states have call predecessors, (563), 166 states have return successors, (608), 537 states have call predecessors, (608), 558 states have call successors, (608) [2021-11-25 18:51:43,978 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2397 states to 2397 states and 3770 transitions. [2021-11-25 18:51:43,978 INFO L78 Accepts]: Start accepts. Automaton has 2397 states and 3770 transitions. Word has length 88 [2021-11-25 18:51:43,979 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:51:43,979 INFO L470 AbstractCegarLoop]: Abstraction has 2397 states and 3770 transitions. [2021-11-25 18:51:43,980 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 6.857142857142857) internal successors, (48), 7 states have internal predecessors, (48), 5 states have call successors, (17), 3 states have call predecessors, (17), 3 states have return successors, (16), 5 states have call predecessors, (16), 4 states have call successors, (16) [2021-11-25 18:51:43,980 INFO L276 IsEmpty]: Start isEmpty. Operand 2397 states and 3770 transitions. [2021-11-25 18:51:43,983 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2021-11-25 18:51:43,983 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:51:43,983 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:51:43,984 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-25 18:51:43,984 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:51:43,984 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:51:43,984 INFO L85 PathProgramCache]: Analyzing trace with hash 763407716, now seen corresponding path program 1 times [2021-11-25 18:51:43,984 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:51:43,985 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [316913590] [2021-11-25 18:51:43,985 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:51:43,985 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:51:44,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:51:44,146 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-25 18:51:44,147 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:51:44,147 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [316913590] [2021-11-25 18:51:44,147 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [316913590] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:51:44,148 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:51:44,148 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 18:51:44,148 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [5526184] [2021-11-25 18:51:44,148 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:51:44,149 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 18:51:44,149 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:51:44,149 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 18:51:44,150 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 18:51:44,150 INFO L87 Difference]: Start difference. First operand 2397 states and 3770 transitions. Second operand has 3 states, 3 states have (on average 16.666666666666668) internal successors, (50), 3 states have internal predecessors, (50), 2 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (17), 2 states have call predecessors, (17), 1 states have call successors, (17) [2021-11-25 18:51:44,503 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:51:44,504 INFO L93 Difference]: Finished difference Result 6096 states and 9653 transitions. [2021-11-25 18:51:44,504 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 18:51:44,504 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 16.666666666666668) internal successors, (50), 3 states have internal predecessors, (50), 2 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (17), 2 states have call predecessors, (17), 1 states have call successors, (17) Word has length 92 [2021-11-25 18:51:44,506 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:51:44,542 INFO L225 Difference]: With dead ends: 6096 [2021-11-25 18:51:44,542 INFO L226 Difference]: Without dead ends: 3715 [2021-11-25 18:51:44,555 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 18:51:44,558 INFO L933 BasicCegarLoop]: 702 mSDtfsCounter, 579 mSDsluCounter, 591 mSDsCounter, 0 mSdLazyCounter, 76 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 579 SdHoareTripleChecker+Valid, 1260 SdHoareTripleChecker+Invalid, 82 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 76 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:51:44,559 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [579 Valid, 1260 Invalid, 82 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 76 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:51:44,564 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3715 states. [2021-11-25 18:51:44,806 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3715 to 3675. [2021-11-25 18:51:44,815 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3675 states, 2563 states have (on average 1.554818571985954) internal successors, (3985), 2688 states have internal predecessors, (3985), 857 states have call successors, (857), 221 states have call predecessors, (857), 254 states have return successors, (956), 813 states have call predecessors, (956), 852 states have call successors, (956) [2021-11-25 18:51:44,843 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3675 states to 3675 states and 5798 transitions. [2021-11-25 18:51:44,844 INFO L78 Accepts]: Start accepts. Automaton has 3675 states and 5798 transitions. Word has length 92 [2021-11-25 18:51:44,844 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:51:44,844 INFO L470 AbstractCegarLoop]: Abstraction has 3675 states and 5798 transitions. [2021-11-25 18:51:44,845 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 16.666666666666668) internal successors, (50), 3 states have internal predecessors, (50), 2 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (17), 2 states have call predecessors, (17), 1 states have call successors, (17) [2021-11-25 18:51:44,845 INFO L276 IsEmpty]: Start isEmpty. Operand 3675 states and 5798 transitions. [2021-11-25 18:51:44,851 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2021-11-25 18:51:44,851 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:51:44,852 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:51:44,852 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-25 18:51:44,852 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:51:44,853 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:51:44,853 INFO L85 PathProgramCache]: Analyzing trace with hash -2104452940, now seen corresponding path program 1 times [2021-11-25 18:51:44,853 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:51:44,853 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1095730159] [2021-11-25 18:51:44,853 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:51:44,853 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:51:44,914 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:51:44,975 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-25 18:51:44,975 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:51:44,976 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1095730159] [2021-11-25 18:51:44,976 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1095730159] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:51:44,976 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:51:44,976 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 18:51:44,976 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1468952226] [2021-11-25 18:51:44,977 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:51:44,978 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 18:51:44,979 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:51:44,979 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 18:51:44,979 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 18:51:44,979 INFO L87 Difference]: Start difference. First operand 3675 states and 5798 transitions. Second operand has 3 states, 3 states have (on average 17.0) internal successors, (51), 3 states have internal predecessors, (51), 2 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (17), 2 states have call predecessors, (17), 1 states have call successors, (17) [2021-11-25 18:51:45,445 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:51:45,445 INFO L93 Difference]: Finished difference Result 9931 states and 15810 transitions. [2021-11-25 18:51:45,446 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 18:51:45,446 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 17.0) internal successors, (51), 3 states have internal predecessors, (51), 2 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (17), 2 states have call predecessors, (17), 1 states have call successors, (17) Word has length 93 [2021-11-25 18:51:45,447 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:51:45,504 INFO L225 Difference]: With dead ends: 9931 [2021-11-25 18:51:45,504 INFO L226 Difference]: Without dead ends: 6273 [2021-11-25 18:51:45,531 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 18:51:45,532 INFO L933 BasicCegarLoop]: 705 mSDtfsCounter, 578 mSDsluCounter, 594 mSDsCounter, 0 mSdLazyCounter, 76 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 578 SdHoareTripleChecker+Valid, 1266 SdHoareTripleChecker+Invalid, 82 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 76 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:51:45,533 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [578 Valid, 1266 Invalid, 82 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 76 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:51:45,543 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6273 states. [2021-11-25 18:51:46,004 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6273 to 6232. [2021-11-25 18:51:46,020 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6232 states, 4356 states have (on average 1.5509641873278237) internal successors, (6756), 4575 states have internal predecessors, (6756), 1445 states have call successors, (1445), 369 states have call predecessors, (1445), 430 states have return successors, (1690), 1365 states have call predecessors, (1690), 1440 states have call successors, (1690) [2021-11-25 18:51:46,068 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6232 states to 6232 states and 9891 transitions. [2021-11-25 18:51:46,070 INFO L78 Accepts]: Start accepts. Automaton has 6232 states and 9891 transitions. Word has length 93 [2021-11-25 18:51:46,070 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:51:46,070 INFO L470 AbstractCegarLoop]: Abstraction has 6232 states and 9891 transitions. [2021-11-25 18:51:46,070 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 17.0) internal successors, (51), 3 states have internal predecessors, (51), 2 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (17), 2 states have call predecessors, (17), 1 states have call successors, (17) [2021-11-25 18:51:46,071 INFO L276 IsEmpty]: Start isEmpty. Operand 6232 states and 9891 transitions. [2021-11-25 18:51:46,076 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2021-11-25 18:51:46,076 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:51:46,077 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:51:46,077 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-25 18:51:46,077 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:51:46,077 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:51:46,078 INFO L85 PathProgramCache]: Analyzing trace with hash -813816154, now seen corresponding path program 1 times [2021-11-25 18:51:46,078 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:51:46,078 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1236117564] [2021-11-25 18:51:46,078 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:51:46,078 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:51:46,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:51:46,225 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-25 18:51:46,225 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:51:46,226 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1236117564] [2021-11-25 18:51:46,226 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1236117564] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:51:46,226 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:51:46,226 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 18:51:46,227 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [633385375] [2021-11-25 18:51:46,227 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:51:46,230 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 18:51:46,230 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:51:46,230 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 18:51:46,231 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 18:51:46,231 INFO L87 Difference]: Start difference. First operand 6232 states and 9891 transitions. Second operand has 3 states, 3 states have (on average 17.333333333333332) internal successors, (52), 3 states have internal predecessors, (52), 2 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (17), 2 states have call predecessors, (17), 1 states have call successors, (17) [2021-11-25 18:51:46,959 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:51:46,960 INFO L93 Difference]: Finished difference Result 17602 states and 28334 transitions. [2021-11-25 18:51:46,960 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 18:51:46,961 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 17.333333333333332) internal successors, (52), 3 states have internal predecessors, (52), 2 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (17), 2 states have call predecessors, (17), 1 states have call successors, (17) Word has length 94 [2021-11-25 18:51:46,961 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:51:47,081 INFO L225 Difference]: With dead ends: 17602 [2021-11-25 18:51:47,081 INFO L226 Difference]: Without dead ends: 11389 [2021-11-25 18:51:47,127 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 18:51:47,129 INFO L933 BasicCegarLoop]: 708 mSDtfsCounter, 577 mSDsluCounter, 597 mSDsCounter, 0 mSdLazyCounter, 76 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 577 SdHoareTripleChecker+Valid, 1272 SdHoareTripleChecker+Invalid, 82 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 76 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:51:47,129 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [577 Valid, 1272 Invalid, 82 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 76 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:51:47,148 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11389 states. [2021-11-25 18:51:47,945 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11389 to 11347. [2021-11-25 18:51:47,978 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11347 states, 7943 states have (on average 1.547022535565907) internal successors, (12288), 8350 states have internal predecessors, (12288), 2621 states have call successors, (2621), 665 states have call predecessors, (2621), 782 states have return successors, (3314), 2469 states have call predecessors, (3314), 2616 states have call successors, (3314) [2021-11-25 18:51:48,065 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11347 states to 11347 states and 18223 transitions. [2021-11-25 18:51:48,067 INFO L78 Accepts]: Start accepts. Automaton has 11347 states and 18223 transitions. Word has length 94 [2021-11-25 18:51:48,068 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:51:48,068 INFO L470 AbstractCegarLoop]: Abstraction has 11347 states and 18223 transitions. [2021-11-25 18:51:48,069 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 17.333333333333332) internal successors, (52), 3 states have internal predecessors, (52), 2 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (17), 2 states have call predecessors, (17), 1 states have call successors, (17) [2021-11-25 18:51:48,069 INFO L276 IsEmpty]: Start isEmpty. Operand 11347 states and 18223 transitions. [2021-11-25 18:51:48,073 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2021-11-25 18:51:48,074 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:51:48,074 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:51:48,074 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-25 18:51:48,074 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:51:48,075 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:51:48,076 INFO L85 PathProgramCache]: Analyzing trace with hash 541222454, now seen corresponding path program 1 times [2021-11-25 18:51:48,076 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:51:48,076 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [156331676] [2021-11-25 18:51:48,076 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:51:48,077 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:51:48,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:51:48,190 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-25 18:51:48,190 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:51:48,191 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [156331676] [2021-11-25 18:51:48,191 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [156331676] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:51:48,191 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:51:48,191 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 18:51:48,192 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1070426692] [2021-11-25 18:51:48,192 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:51:48,193 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 18:51:48,193 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:51:48,193 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 18:51:48,194 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 18:51:48,194 INFO L87 Difference]: Start difference. First operand 11347 states and 18223 transitions. Second operand has 3 states, 3 states have (on average 17.666666666666668) internal successors, (53), 3 states have internal predecessors, (53), 2 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (17), 2 states have call predecessors, (17), 1 states have call successors, (17) [2021-11-25 18:51:49,306 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:51:49,307 INFO L93 Difference]: Finished difference Result 32945 states and 54147 transitions. [2021-11-25 18:51:49,307 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 18:51:49,307 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 17.666666666666668) internal successors, (53), 3 states have internal predecessors, (53), 2 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (17), 2 states have call predecessors, (17), 1 states have call successors, (17) Word has length 95 [2021-11-25 18:51:49,308 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:51:49,484 INFO L225 Difference]: With dead ends: 32945 [2021-11-25 18:51:49,484 INFO L226 Difference]: Without dead ends: 21621 [2021-11-25 18:51:49,648 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 18:51:49,649 INFO L933 BasicCegarLoop]: 711 mSDtfsCounter, 576 mSDsluCounter, 600 mSDsCounter, 0 mSdLazyCounter, 76 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 576 SdHoareTripleChecker+Valid, 1278 SdHoareTripleChecker+Invalid, 82 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 76 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:51:49,650 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [576 Valid, 1278 Invalid, 82 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 76 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:51:49,678 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21621 states. [2021-11-25 18:51:51,040 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21621 to 21578. [2021-11-25 18:51:51,086 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21578 states, 15118 states have (on average 1.5427966662256913) internal successors, (23324), 15901 states have internal predecessors, (23324), 4973 states have call successors, (4973), 1257 states have call predecessors, (4973), 1486 states have return successors, (7126), 4677 states have call predecessors, (7126), 4968 states have call successors, (7126) [2021-11-25 18:51:51,256 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21578 states to 21578 states and 35423 transitions. [2021-11-25 18:51:51,260 INFO L78 Accepts]: Start accepts. Automaton has 21578 states and 35423 transitions. Word has length 95 [2021-11-25 18:51:51,261 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:51:51,261 INFO L470 AbstractCegarLoop]: Abstraction has 21578 states and 35423 transitions. [2021-11-25 18:51:51,262 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 17.666666666666668) internal successors, (53), 3 states have internal predecessors, (53), 2 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (17), 2 states have call predecessors, (17), 1 states have call successors, (17) [2021-11-25 18:51:51,262 INFO L276 IsEmpty]: Start isEmpty. Operand 21578 states and 35423 transitions. [2021-11-25 18:51:51,267 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2021-11-25 18:51:51,267 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:51:51,267 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:51:51,267 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-25 18:51:51,268 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:51:51,268 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:51:51,268 INFO L85 PathProgramCache]: Analyzing trace with hash -402249752, now seen corresponding path program 1 times [2021-11-25 18:51:51,269 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:51:51,269 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [871074142] [2021-11-25 18:51:51,269 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:51:51,269 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:51:51,322 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:51:51,378 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-25 18:51:51,379 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:51:51,379 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [871074142] [2021-11-25 18:51:51,379 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [871074142] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:51:51,379 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:51:51,379 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 18:51:51,380 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1384454079] [2021-11-25 18:51:51,380 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:51:51,381 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 18:51:51,381 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:51:51,381 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 18:51:51,382 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 18:51:51,382 INFO L87 Difference]: Start difference. First operand 21578 states and 35423 transitions. Second operand has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 states have internal predecessors, (54), 2 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (17), 2 states have call predecessors, (17), 1 states have call successors, (17) [2021-11-25 18:51:52,475 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:51:52,475 INFO L93 Difference]: Finished difference Result 22901 states and 37759 transitions. [2021-11-25 18:51:52,476 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 18:51:52,476 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 states have internal predecessors, (54), 2 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (17), 2 states have call predecessors, (17), 1 states have call successors, (17) Word has length 96 [2021-11-25 18:51:52,476 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:51:52,615 INFO L225 Difference]: With dead ends: 22901 [2021-11-25 18:51:52,616 INFO L226 Difference]: Without dead ends: 22890 [2021-11-25 18:51:52,626 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 18:51:52,628 INFO L933 BasicCegarLoop]: 704 mSDtfsCounter, 562 mSDsluCounter, 604 mSDsCounter, 0 mSdLazyCounter, 74 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 562 SdHoareTripleChecker+Valid, 1276 SdHoareTripleChecker+Invalid, 77 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 74 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:51:52,628 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [562 Valid, 1276 Invalid, 77 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 74 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:51:52,656 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22890 states. [2021-11-25 18:51:53,943 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22890 to 22852. [2021-11-25 18:51:53,984 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22852 states, 16011 states have (on average 1.5406907750921242) internal successors, (24668), 16841 states have internal predecessors, (24668), 5267 states have call successors, (5267), 1331 states have call predecessors, (5267), 1573 states have return successors, (7740), 4952 states have call predecessors, (7740), 5262 states have call successors, (7740) [2021-11-25 18:51:54,283 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22852 states to 22852 states and 37675 transitions. [2021-11-25 18:51:54,283 INFO L78 Accepts]: Start accepts. Automaton has 22852 states and 37675 transitions. Word has length 96 [2021-11-25 18:51:54,284 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:51:54,284 INFO L470 AbstractCegarLoop]: Abstraction has 22852 states and 37675 transitions. [2021-11-25 18:51:54,284 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 states have internal predecessors, (54), 2 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (17), 2 states have call predecessors, (17), 1 states have call successors, (17) [2021-11-25 18:51:54,285 INFO L276 IsEmpty]: Start isEmpty. Operand 22852 states and 37675 transitions. [2021-11-25 18:51:54,294 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2021-11-25 18:51:54,295 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:51:54,295 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:51:54,295 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-11-25 18:51:54,296 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:51:54,296 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:51:54,296 INFO L85 PathProgramCache]: Analyzing trace with hash 829380609, now seen corresponding path program 1 times [2021-11-25 18:51:54,296 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:51:54,297 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1843502977] [2021-11-25 18:51:54,297 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:51:54,297 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:51:54,347 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:51:54,427 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2021-11-25 18:51:54,427 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:51:54,428 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1843502977] [2021-11-25 18:51:54,430 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1843502977] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:51:54,430 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:51:54,431 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 18:51:54,431 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [567144238] [2021-11-25 18:51:54,431 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:51:54,432 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 18:51:54,432 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:51:54,432 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 18:51:54,433 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 18:51:54,433 INFO L87 Difference]: Start difference. First operand 22852 states and 37675 transitions. Second operand has 4 states, 4 states have (on average 18.25) internal successors, (73), 4 states have internal predecessors, (73), 2 states have call successors, (27), 2 states have call predecessors, (27), 2 states have return successors, (26), 2 states have call predecessors, (26), 2 states have call successors, (26) [2021-11-25 18:51:55,869 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:51:55,869 INFO L93 Difference]: Finished difference Result 46569 states and 78641 transitions. [2021-11-25 18:51:55,869 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 18:51:55,869 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 18.25) internal successors, (73), 4 states have internal predecessors, (73), 2 states have call successors, (27), 2 states have call predecessors, (27), 2 states have return successors, (26), 2 states have call predecessors, (26), 2 states have call successors, (26) Word has length 149 [2021-11-25 18:51:55,870 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:51:56,034 INFO L225 Difference]: With dead ends: 46569 [2021-11-25 18:51:56,036 INFO L226 Difference]: Without dead ends: 23734 [2021-11-25 18:51:56,134 INFO L932 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 [2021-11-25 18:51:56,135 INFO L933 BasicCegarLoop]: 584 mSDtfsCounter, 30 mSDsluCounter, 1208 mSDsCounter, 0 mSdLazyCounter, 121 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 1717 SdHoareTripleChecker+Invalid, 136 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 121 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:51:56,136 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [37 Valid, 1717 Invalid, 136 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 121 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:51:56,159 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23734 states. [2021-11-25 18:51:57,632 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23734 to 22960. [2021-11-25 18:51:57,673 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22960 states, 16119 states have (on average 1.537068056331038) internal successors, (24776), 16949 states have internal predecessors, (24776), 5267 states have call successors, (5267), 1331 states have call predecessors, (5267), 1573 states have return successors, (7740), 4952 states have call predecessors, (7740), 5262 states have call successors, (7740) [2021-11-25 18:51:57,827 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22960 states to 22960 states and 37783 transitions. [2021-11-25 18:51:57,833 INFO L78 Accepts]: Start accepts. Automaton has 22960 states and 37783 transitions. Word has length 149 [2021-11-25 18:51:57,834 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:51:57,834 INFO L470 AbstractCegarLoop]: Abstraction has 22960 states and 37783 transitions. [2021-11-25 18:51:57,834 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 18.25) internal successors, (73), 4 states have internal predecessors, (73), 2 states have call successors, (27), 2 states have call predecessors, (27), 2 states have return successors, (26), 2 states have call predecessors, (26), 2 states have call successors, (26) [2021-11-25 18:51:57,835 INFO L276 IsEmpty]: Start isEmpty. Operand 22960 states and 37783 transitions. [2021-11-25 18:51:57,845 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 157 [2021-11-25 18:51:57,845 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:51:57,845 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:51:57,846 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-11-25 18:51:57,846 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:51:57,846 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:51:57,847 INFO L85 PathProgramCache]: Analyzing trace with hash -1275500057, now seen corresponding path program 1 times [2021-11-25 18:51:57,847 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:51:57,847 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1992254220] [2021-11-25 18:51:57,847 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:51:57,848 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:51:57,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:51:57,992 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 4 proven. 16 refuted. 0 times theorem prover too weak. 61 trivial. 0 not checked. [2021-11-25 18:51:57,993 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:51:57,993 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1992254220] [2021-11-25 18:51:57,993 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1992254220] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:51:57,994 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1212438366] [2021-11-25 18:51:57,994 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:51:57,994 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:51:57,994 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb524a7c-3169-41a1-9cec-c542633b6551/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:51:57,999 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb524a7c-3169-41a1-9cec-c542633b6551/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:51:58,017 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb524a7c-3169-41a1-9cec-c542633b6551/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-25 18:51:58,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:51:58,418 INFO L263 TraceCheckSpWp]: Trace formula consists of 2102 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-25 18:51:58,433 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:51:58,906 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 46 proven. 0 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2021-11-25 18:51:58,907 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:51:58,907 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1212438366] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:51:58,907 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 18:51:58,907 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [5] total 7 [2021-11-25 18:51:58,910 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1315498491] [2021-11-25 18:51:58,910 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:51:58,911 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 18:51:58,911 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:51:58,911 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 18:51:58,912 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-11-25 18:51:58,912 INFO L87 Difference]: Start difference. First operand 22960 states and 37783 transitions. Second operand has 4 states, 4 states have (on average 21.75) internal successors, (87), 4 states have internal predecessors, (87), 2 states have call successors, (28), 2 states have call predecessors, (28), 3 states have return successors, (27), 2 states have call predecessors, (27), 2 states have call successors, (27) [2021-11-25 18:52:00,363 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:52:00,364 INFO L93 Difference]: Finished difference Result 47307 states and 80480 transitions. [2021-11-25 18:52:00,364 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 18:52:00,364 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 21.75) internal successors, (87), 4 states have internal predecessors, (87), 2 states have call successors, (28), 2 states have call predecessors, (28), 3 states have return successors, (27), 2 states have call predecessors, (27), 2 states have call successors, (27) Word has length 156 [2021-11-25 18:52:00,365 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:52:00,628 INFO L225 Difference]: With dead ends: 47307 [2021-11-25 18:52:00,628 INFO L226 Difference]: Without dead ends: 24364 [2021-11-25 18:52:00,732 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 164 GetRequests, 158 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-11-25 18:52:00,733 INFO L933 BasicCegarLoop]: 510 mSDtfsCounter, 213 mSDsluCounter, 1072 mSDsCounter, 0 mSdLazyCounter, 260 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 213 SdHoareTripleChecker+Valid, 1506 SdHoareTripleChecker+Invalid, 269 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 260 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 18:52:00,733 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [213 Valid, 1506 Invalid, 269 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 260 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 18:52:00,753 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24364 states. [2021-11-25 18:52:02,112 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24364 to 24364. [2021-11-25 18:52:02,146 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24364 states, 17487 states have (on average 1.5671069937667983) internal successors, (27404), 18317 states have internal predecessors, (27404), 5267 states have call successors, (5267), 1367 states have call predecessors, (5267), 1609 states have return successors, (7740), 4952 states have call predecessors, (7740), 5262 states have call successors, (7740) [2021-11-25 18:52:02,418 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24364 states to 24364 states and 40411 transitions. [2021-11-25 18:52:02,423 INFO L78 Accepts]: Start accepts. Automaton has 24364 states and 40411 transitions. Word has length 156 [2021-11-25 18:52:02,425 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:52:02,425 INFO L470 AbstractCegarLoop]: Abstraction has 24364 states and 40411 transitions. [2021-11-25 18:52:02,426 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 21.75) internal successors, (87), 4 states have internal predecessors, (87), 2 states have call successors, (28), 2 states have call predecessors, (28), 3 states have return successors, (27), 2 states have call predecessors, (27), 2 states have call successors, (27) [2021-11-25 18:52:02,426 INFO L276 IsEmpty]: Start isEmpty. Operand 24364 states and 40411 transitions. [2021-11-25 18:52:02,439 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 162 [2021-11-25 18:52:02,439 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:52:02,440 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 5, 5, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:52:02,480 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb524a7c-3169-41a1-9cec-c542633b6551/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2021-11-25 18:52:02,665 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb524a7c-3169-41a1-9cec-c542633b6551/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:52:02,666 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:52:02,666 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:52:02,666 INFO L85 PathProgramCache]: Analyzing trace with hash -403579044, now seen corresponding path program 1 times [2021-11-25 18:52:02,666 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:52:02,667 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [181253423] [2021-11-25 18:52:02,667 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:52:02,667 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:52:02,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:52:02,815 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 9 proven. 15 refuted. 0 times theorem prover too weak. 67 trivial. 0 not checked. [2021-11-25 18:52:02,816 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:52:02,816 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [181253423] [2021-11-25 18:52:02,816 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [181253423] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:52:02,816 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [341542242] [2021-11-25 18:52:02,816 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:52:02,817 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:52:02,817 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb524a7c-3169-41a1-9cec-c542633b6551/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:52:02,818 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb524a7c-3169-41a1-9cec-c542633b6551/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:52:02,841 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb524a7c-3169-41a1-9cec-c542633b6551/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-25 18:52:03,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:52:03,240 INFO L263 TraceCheckSpWp]: Trace formula consists of 2107 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-25 18:52:03,253 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:52:03,561 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 64 proven. 0 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2021-11-25 18:52:03,561 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:52:03,562 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [341542242] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:52:03,562 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 18:52:03,562 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [4] total 6 [2021-11-25 18:52:03,562 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [908689392] [2021-11-25 18:52:03,563 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:52:03,564 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 18:52:03,564 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:52:03,565 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 18:52:03,565 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-25 18:52:03,565 INFO L87 Difference]: Start difference. First operand 24364 states and 40411 transitions. Second operand has 4 states, 4 states have (on average 23.0) internal successors, (92), 4 states have internal predecessors, (92), 2 states have call successors, (28), 2 states have call predecessors, (28), 3 states have return successors, (27), 2 states have call predecessors, (27), 2 states have call successors, (27) [2021-11-25 18:52:05,002 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:52:05,003 INFO L93 Difference]: Finished difference Result 50115 states and 85631 transitions. [2021-11-25 18:52:05,003 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 18:52:05,004 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 23.0) internal successors, (92), 4 states have internal predecessors, (92), 2 states have call successors, (28), 2 states have call predecessors, (28), 3 states have return successors, (27), 2 states have call predecessors, (27), 2 states have call successors, (27) Word has length 161 [2021-11-25 18:52:05,004 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:52:05,134 INFO L225 Difference]: With dead ends: 50115 [2021-11-25 18:52:05,135 INFO L226 Difference]: Without dead ends: 25768 [2021-11-25 18:52:05,232 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 166 GetRequests, 161 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-25 18:52:05,233 INFO L933 BasicCegarLoop]: 510 mSDtfsCounter, 211 mSDsluCounter, 1072 mSDsCounter, 0 mSdLazyCounter, 254 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 211 SdHoareTripleChecker+Valid, 1506 SdHoareTripleChecker+Invalid, 268 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 254 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 18:52:05,234 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [211 Valid, 1506 Invalid, 268 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 254 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 18:52:05,267 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25768 states. [2021-11-25 18:52:06,359 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25768 to 25768. [2021-11-25 18:52:06,387 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25768 states, 18855 states have (on average 1.5927870591355078) internal successors, (30032), 19685 states have internal predecessors, (30032), 5267 states have call successors, (5267), 1403 states have call predecessors, (5267), 1645 states have return successors, (7740), 4952 states have call predecessors, (7740), 5262 states have call successors, (7740) [2021-11-25 18:52:06,565 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25768 states to 25768 states and 43039 transitions. [2021-11-25 18:52:06,572 INFO L78 Accepts]: Start accepts. Automaton has 25768 states and 43039 transitions. Word has length 161 [2021-11-25 18:52:06,575 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:52:06,575 INFO L470 AbstractCegarLoop]: Abstraction has 25768 states and 43039 transitions. [2021-11-25 18:52:06,575 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 23.0) internal successors, (92), 4 states have internal predecessors, (92), 2 states have call successors, (28), 2 states have call predecessors, (28), 3 states have return successors, (27), 2 states have call predecessors, (27), 2 states have call successors, (27) [2021-11-25 18:52:06,576 INFO L276 IsEmpty]: Start isEmpty. Operand 25768 states and 43039 transitions. [2021-11-25 18:52:06,587 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 166 [2021-11-25 18:52:06,587 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:52:06,588 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 5, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:52:06,628 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb524a7c-3169-41a1-9cec-c542633b6551/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-25 18:52:06,813 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb524a7c-3169-41a1-9cec-c542633b6551/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:52:06,814 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:52:06,814 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:52:06,814 INFO L85 PathProgramCache]: Analyzing trace with hash 144039148, now seen corresponding path program 1 times [2021-11-25 18:52:06,815 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:52:06,815 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1562267017] [2021-11-25 18:52:06,815 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:52:06,815 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:52:06,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:52:07,120 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 15 proven. 12 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2021-11-25 18:52:07,120 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:52:07,120 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1562267017] [2021-11-25 18:52:07,121 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1562267017] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:52:07,121 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1795107495] [2021-11-25 18:52:07,121 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:52:07,121 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:52:07,121 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb524a7c-3169-41a1-9cec-c542633b6551/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:52:07,126 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb524a7c-3169-41a1-9cec-c542633b6551/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:52:07,163 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb524a7c-3169-41a1-9cec-c542633b6551/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-25 18:52:07,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:52:07,555 INFO L263 TraceCheckSpWp]: Trace formula consists of 2111 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-25 18:52:07,561 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:52:07,857 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 69 proven. 0 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-25 18:52:07,857 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:52:07,857 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1795107495] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:52:07,857 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 18:52:07,858 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [4] total 6 [2021-11-25 18:52:07,860 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [315633295] [2021-11-25 18:52:07,860 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:52:07,861 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 18:52:07,862 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:52:07,862 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 18:52:07,862 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-25 18:52:07,863 INFO L87 Difference]: Start difference. First operand 25768 states and 43039 transitions. Second operand has 4 states, 4 states have (on average 24.0) internal successors, (96), 4 states have internal predecessors, (96), 2 states have call successors, (28), 2 states have call predecessors, (28), 3 states have return successors, (27), 2 states have call predecessors, (27), 2 states have call successors, (27) [2021-11-25 18:52:08,881 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:52:08,882 INFO L93 Difference]: Finished difference Result 52923 states and 90782 transitions. [2021-11-25 18:52:08,882 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 18:52:08,882 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 24.0) internal successors, (96), 4 states have internal predecessors, (96), 2 states have call successors, (28), 2 states have call predecessors, (28), 3 states have return successors, (27), 2 states have call predecessors, (27), 2 states have call successors, (27) Word has length 165 [2021-11-25 18:52:08,882 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:52:09,005 INFO L225 Difference]: With dead ends: 52923 [2021-11-25 18:52:09,005 INFO L226 Difference]: Without dead ends: 27172 [2021-11-25 18:52:09,100 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 170 GetRequests, 165 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-25 18:52:09,102 INFO L933 BasicCegarLoop]: 510 mSDtfsCounter, 209 mSDsluCounter, 1072 mSDsCounter, 0 mSdLazyCounter, 248 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 209 SdHoareTripleChecker+Valid, 1506 SdHoareTripleChecker+Invalid, 267 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 248 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 18:52:09,103 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [209 Valid, 1506 Invalid, 267 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 248 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 18:52:09,130 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27172 states. [2021-11-25 18:52:10,223 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27172 to 27172. [2021-11-25 18:52:10,236 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27172 states, 20223 states have (on average 1.614992829946101) internal successors, (32660), 21053 states have internal predecessors, (32660), 5267 states have call successors, (5267), 1439 states have call predecessors, (5267), 1681 states have return successors, (7740), 4952 states have call predecessors, (7740), 5262 states have call successors, (7740) [2021-11-25 18:52:10,378 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27172 states to 27172 states and 45667 transitions. [2021-11-25 18:52:10,384 INFO L78 Accepts]: Start accepts. Automaton has 27172 states and 45667 transitions. Word has length 165 [2021-11-25 18:52:10,384 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:52:10,385 INFO L470 AbstractCegarLoop]: Abstraction has 27172 states and 45667 transitions. [2021-11-25 18:52:10,385 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 24.0) internal successors, (96), 4 states have internal predecessors, (96), 2 states have call successors, (28), 2 states have call predecessors, (28), 3 states have return successors, (27), 2 states have call predecessors, (27), 2 states have call successors, (27) [2021-11-25 18:52:10,385 INFO L276 IsEmpty]: Start isEmpty. Operand 27172 states and 45667 transitions. [2021-11-25 18:52:10,400 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 169 [2021-11-25 18:52:10,401 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:52:10,401 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 5, 4, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:52:10,441 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb524a7c-3169-41a1-9cec-c542633b6551/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-25 18:52:10,629 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb524a7c-3169-41a1-9cec-c542633b6551/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-11-25 18:52:10,630 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:52:10,630 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:52:10,630 INFO L85 PathProgramCache]: Analyzing trace with hash -372693039, now seen corresponding path program 1 times [2021-11-25 18:52:10,631 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:52:10,631 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1352394996] [2021-11-25 18:52:10,631 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:52:10,631 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:52:10,715 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:52:10,807 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 22 proven. 7 refuted. 0 times theorem prover too weak. 71 trivial. 0 not checked. [2021-11-25 18:52:10,807 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:52:10,808 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1352394996] [2021-11-25 18:52:10,808 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1352394996] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:52:10,808 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1831175502] [2021-11-25 18:52:10,808 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:52:10,809 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:52:10,809 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb524a7c-3169-41a1-9cec-c542633b6551/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:52:10,810 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb524a7c-3169-41a1-9cec-c542633b6551/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:52:10,823 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb524a7c-3169-41a1-9cec-c542633b6551/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-25 18:52:11,206 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:52:11,215 INFO L263 TraceCheckSpWp]: Trace formula consists of 2114 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-25 18:52:11,222 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:52:11,490 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 60 proven. 0 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-25 18:52:11,491 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:52:11,491 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1831175502] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:52:11,491 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 18:52:11,491 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [4] total 6 [2021-11-25 18:52:11,492 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [597515236] [2021-11-25 18:52:11,492 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:52:11,493 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 18:52:11,493 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:52:11,493 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 18:52:11,493 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-25 18:52:11,494 INFO L87 Difference]: Start difference. First operand 27172 states and 45667 transitions. Second operand has 4 states, 4 states have (on average 25.0) internal successors, (100), 4 states have internal predecessors, (100), 2 states have call successors, (28), 2 states have call predecessors, (28), 3 states have return successors, (27), 2 states have call predecessors, (27), 2 states have call successors, (27) [2021-11-25 18:52:12,716 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:52:12,716 INFO L93 Difference]: Finished difference Result 55731 states and 95933 transitions. [2021-11-25 18:52:12,726 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 18:52:12,726 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 25.0) internal successors, (100), 4 states have internal predecessors, (100), 2 states have call successors, (28), 2 states have call predecessors, (28), 3 states have return successors, (27), 2 states have call predecessors, (27), 2 states have call successors, (27) Word has length 168 [2021-11-25 18:52:12,727 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:52:12,858 INFO L225 Difference]: With dead ends: 55731 [2021-11-25 18:52:12,859 INFO L226 Difference]: Without dead ends: 28576 [2021-11-25 18:52:12,934 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 173 GetRequests, 168 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-25 18:52:12,934 INFO L933 BasicCegarLoop]: 510 mSDtfsCounter, 207 mSDsluCounter, 1072 mSDsCounter, 0 mSdLazyCounter, 242 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 207 SdHoareTripleChecker+Valid, 1506 SdHoareTripleChecker+Invalid, 266 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 242 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 18:52:12,935 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [207 Valid, 1506 Invalid, 266 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 242 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 18:52:12,964 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28576 states. [2021-11-25 18:52:13,841 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28576 to 28576. [2021-11-25 18:52:13,863 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28576 states, 21591 states have (on average 1.6343846973275902) internal successors, (35288), 22421 states have internal predecessors, (35288), 5267 states have call successors, (5267), 1475 states have call predecessors, (5267), 1717 states have return successors, (7740), 4952 states have call predecessors, (7740), 5262 states have call successors, (7740) [2021-11-25 18:52:14,128 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28576 states to 28576 states and 48295 transitions. [2021-11-25 18:52:14,133 INFO L78 Accepts]: Start accepts. Automaton has 28576 states and 48295 transitions. Word has length 168 [2021-11-25 18:52:14,133 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:52:14,133 INFO L470 AbstractCegarLoop]: Abstraction has 28576 states and 48295 transitions. [2021-11-25 18:52:14,134 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 25.0) internal successors, (100), 4 states have internal predecessors, (100), 2 states have call successors, (28), 2 states have call predecessors, (28), 3 states have return successors, (27), 2 states have call predecessors, (27), 2 states have call successors, (27) [2021-11-25 18:52:14,134 INFO L276 IsEmpty]: Start isEmpty. Operand 28576 states and 48295 transitions. [2021-11-25 18:52:14,144 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 171 [2021-11-25 18:52:14,144 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:52:14,144 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:52:14,182 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb524a7c-3169-41a1-9cec-c542633b6551/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-25 18:52:14,357 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb524a7c-3169-41a1-9cec-c542633b6551/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-11-25 18:52:14,358 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:52:14,358 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:52:14,358 INFO L85 PathProgramCache]: Analyzing trace with hash 1320601603, now seen corresponding path program 1 times [2021-11-25 18:52:14,358 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:52:14,358 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1079373800] [2021-11-25 18:52:14,359 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:52:14,359 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:52:14,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:52:14,535 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 12 proven. 8 refuted. 0 times theorem prover too weak. 61 trivial. 0 not checked. [2021-11-25 18:52:14,535 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:52:14,536 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1079373800] [2021-11-25 18:52:14,536 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1079373800] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:52:14,536 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1911539455] [2021-11-25 18:52:14,536 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:52:14,536 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:52:14,537 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb524a7c-3169-41a1-9cec-c542633b6551/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:52:14,537 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb524a7c-3169-41a1-9cec-c542633b6551/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:52:14,553 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb524a7c-3169-41a1-9cec-c542633b6551/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-25 18:52:14,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:52:14,930 INFO L263 TraceCheckSpWp]: Trace formula consists of 2110 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-25 18:52:14,935 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:52:15,287 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 79 trivial. 0 not checked. [2021-11-25 18:52:15,287 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:52:15,287 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1911539455] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:52:15,288 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 18:52:15,288 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [8] total 12 [2021-11-25 18:52:15,288 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [14599835] [2021-11-25 18:52:15,288 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:52:15,289 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-25 18:52:15,289 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:52:15,289 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-25 18:52:15,290 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=110, Unknown=0, NotChecked=0, Total=132 [2021-11-25 18:52:15,290 INFO L87 Difference]: Start difference. First operand 28576 states and 48295 transitions. Second operand has 6 states, 5 states have (on average 18.2) internal successors, (91), 5 states have internal predecessors, (91), 3 states have call successors, (28), 3 states have call predecessors, (28), 4 states have return successors, (27), 4 states have call predecessors, (27), 2 states have call successors, (27) [2021-11-25 18:52:16,914 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:52:16,915 INFO L93 Difference]: Finished difference Result 58999 states and 100141 transitions. [2021-11-25 18:52:16,915 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-25 18:52:16,915 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 18.2) internal successors, (91), 5 states have internal predecessors, (91), 3 states have call successors, (28), 3 states have call predecessors, (28), 4 states have return successors, (27), 4 states have call predecessors, (27), 2 states have call successors, (27) Word has length 170 [2021-11-25 18:52:16,916 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:52:17,051 INFO L225 Difference]: With dead ends: 58999 [2021-11-25 18:52:17,051 INFO L226 Difference]: Without dead ends: 30455 [2021-11-25 18:52:17,127 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 183 GetRequests, 171 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=30, Invalid=152, Unknown=0, NotChecked=0, Total=182 [2021-11-25 18:52:17,128 INFO L933 BasicCegarLoop]: 659 mSDtfsCounter, 336 mSDsluCounter, 1996 mSDsCounter, 0 mSdLazyCounter, 360 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 338 SdHoareTripleChecker+Valid, 2520 SdHoareTripleChecker+Invalid, 362 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 360 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 18:52:17,128 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [338 Valid, 2520 Invalid, 362 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 360 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 18:52:17,150 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30455 states. [2021-11-25 18:52:18,361 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30455 to 30255. [2021-11-25 18:52:18,376 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30255 states, 22705 states have (on average 1.6165602290244439) internal successors, (36704), 23577 states have internal predecessors, (36704), 5634 states have call successors, (5634), 1685 states have call predecessors, (5634), 1915 states have return successors, (8955), 5265 states have call predecessors, (8955), 5629 states have call successors, (8955) [2021-11-25 18:52:18,486 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30255 states to 30255 states and 51293 transitions. [2021-11-25 18:52:18,491 INFO L78 Accepts]: Start accepts. Automaton has 30255 states and 51293 transitions. Word has length 170 [2021-11-25 18:52:18,492 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:52:18,492 INFO L470 AbstractCegarLoop]: Abstraction has 30255 states and 51293 transitions. [2021-11-25 18:52:18,492 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 18.2) internal successors, (91), 5 states have internal predecessors, (91), 3 states have call successors, (28), 3 states have call predecessors, (28), 4 states have return successors, (27), 4 states have call predecessors, (27), 2 states have call successors, (27) [2021-11-25 18:52:18,492 INFO L276 IsEmpty]: Start isEmpty. Operand 30255 states and 51293 transitions. [2021-11-25 18:52:18,502 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 174 [2021-11-25 18:52:18,502 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:52:18,503 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:52:18,543 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb524a7c-3169-41a1-9cec-c542633b6551/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-25 18:52:18,717 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb524a7c-3169-41a1-9cec-c542633b6551/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:52:18,718 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:52:18,718 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:52:18,718 INFO L85 PathProgramCache]: Analyzing trace with hash 1424808555, now seen corresponding path program 1 times [2021-11-25 18:52:18,718 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:52:18,718 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1611052934] [2021-11-25 18:52:18,719 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:52:18,719 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:52:18,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:52:18,877 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 12 proven. 8 refuted. 0 times theorem prover too weak. 61 trivial. 0 not checked. [2021-11-25 18:52:18,877 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:52:18,878 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1611052934] [2021-11-25 18:52:18,878 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1611052934] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:52:18,878 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1472619495] [2021-11-25 18:52:18,878 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:52:18,878 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:52:18,879 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb524a7c-3169-41a1-9cec-c542633b6551/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:52:18,879 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb524a7c-3169-41a1-9cec-c542633b6551/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:52:18,885 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb524a7c-3169-41a1-9cec-c542633b6551/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-25 18:52:19,261 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:52:19,270 INFO L263 TraceCheckSpWp]: Trace formula consists of 2115 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-25 18:52:19,281 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:52:19,780 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2021-11-25 18:52:19,780 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:52:19,781 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1472619495] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:52:19,781 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 18:52:19,781 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [8] total 14 [2021-11-25 18:52:19,781 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [533676545] [2021-11-25 18:52:19,781 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:52:19,782 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-25 18:52:19,782 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:52:19,783 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-25 18:52:19,783 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=151, Unknown=0, NotChecked=0, Total=182 [2021-11-25 18:52:19,783 INFO L87 Difference]: Start difference. First operand 30255 states and 51293 transitions. Second operand has 8 states, 7 states have (on average 13.285714285714286) internal successors, (93), 7 states have internal predecessors, (93), 5 states have call successors, (28), 4 states have call predecessors, (28), 5 states have return successors, (27), 7 states have call predecessors, (27), 4 states have call successors, (27) [2021-11-25 18:52:23,524 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:52:23,525 INFO L93 Difference]: Finished difference Result 58433 states and 99393 transitions. [2021-11-25 18:52:23,525 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-25 18:52:23,525 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 13.285714285714286) internal successors, (93), 7 states have internal predecessors, (93), 5 states have call successors, (28), 4 states have call predecessors, (28), 5 states have return successors, (27), 7 states have call predecessors, (27), 4 states have call successors, (27) Word has length 173 [2021-11-25 18:52:23,526 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:52:23,845 INFO L225 Difference]: With dead ends: 58433 [2021-11-25 18:52:23,846 INFO L226 Difference]: Without dead ends: 28196 [2021-11-25 18:52:23,940 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 192 GetRequests, 173 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=71, Invalid=349, Unknown=0, NotChecked=0, Total=420 [2021-11-25 18:52:23,941 INFO L933 BasicCegarLoop]: 574 mSDtfsCounter, 996 mSDsluCounter, 1047 mSDsCounter, 0 mSdLazyCounter, 3509 mSolverCounterSat, 490 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1074 SdHoareTripleChecker+Valid, 1544 SdHoareTripleChecker+Invalid, 3999 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 490 IncrementalHoareTripleChecker+Valid, 3509 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.5s IncrementalHoareTripleChecker+Time [2021-11-25 18:52:23,941 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1074 Valid, 1544 Invalid, 3999 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [490 Valid, 3509 Invalid, 0 Unknown, 0 Unchecked, 2.5s Time] [2021-11-25 18:52:23,967 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28196 states. [2021-11-25 18:52:25,123 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28196 to 27027. [2021-11-25 18:52:25,142 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27027 states, 19880 states have (on average 1.533400402414487) internal successors, (30484), 20603 states have internal predecessors, (30484), 5114 states have call successors, (5114), 1781 states have call predecessors, (5114), 2032 states have return successors, (8436), 4845 states have call predecessors, (8436), 5109 states have call successors, (8436) [2021-11-25 18:52:25,273 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27027 states to 27027 states and 44034 transitions. [2021-11-25 18:52:25,280 INFO L78 Accepts]: Start accepts. Automaton has 27027 states and 44034 transitions. Word has length 173 [2021-11-25 18:52:25,281 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:52:25,281 INFO L470 AbstractCegarLoop]: Abstraction has 27027 states and 44034 transitions. [2021-11-25 18:52:25,282 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 13.285714285714286) internal successors, (93), 7 states have internal predecessors, (93), 5 states have call successors, (28), 4 states have call predecessors, (28), 5 states have return successors, (27), 7 states have call predecessors, (27), 4 states have call successors, (27) [2021-11-25 18:52:25,282 INFO L276 IsEmpty]: Start isEmpty. Operand 27027 states and 44034 transitions. [2021-11-25 18:52:25,293 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 174 [2021-11-25 18:52:25,294 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:52:25,294 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:52:25,327 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb524a7c-3169-41a1-9cec-c542633b6551/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2021-11-25 18:52:25,513 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb524a7c-3169-41a1-9cec-c542633b6551/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-11-25 18:52:25,514 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:52:25,515 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:52:25,515 INFO L85 PathProgramCache]: Analyzing trace with hash -1626646630, now seen corresponding path program 1 times [2021-11-25 18:52:25,515 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:52:25,515 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1012267829] [2021-11-25 18:52:25,516 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:52:25,516 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:52:25,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:52:25,683 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 12 proven. 8 refuted. 0 times theorem prover too weak. 61 trivial. 0 not checked. [2021-11-25 18:52:25,683 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:52:25,684 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1012267829] [2021-11-25 18:52:25,684 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1012267829] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:52:25,684 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1604875049] [2021-11-25 18:52:25,684 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:52:25,684 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:52:25,685 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb524a7c-3169-41a1-9cec-c542633b6551/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:52:25,686 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb524a7c-3169-41a1-9cec-c542633b6551/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:52:25,709 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb524a7c-3169-41a1-9cec-c542633b6551/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-25 18:52:26,036 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:52:26,043 INFO L263 TraceCheckSpWp]: Trace formula consists of 2116 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-25 18:52:26,047 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:52:26,413 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2021-11-25 18:52:26,413 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:52:26,413 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1604875049] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:52:26,413 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 18:52:26,413 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [8] total 11 [2021-11-25 18:52:26,414 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [208884514] [2021-11-25 18:52:26,414 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:52:26,414 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 18:52:26,414 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:52:26,415 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 18:52:26,415 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=88, Unknown=0, NotChecked=0, Total=110 [2021-11-25 18:52:26,415 INFO L87 Difference]: Start difference. First operand 27027 states and 44034 transitions. Second operand has 5 states, 5 states have (on average 18.6) internal successors, (93), 4 states have internal predecessors, (93), 2 states have call successors, (28), 2 states have call predecessors, (28), 2 states have return successors, (27), 2 states have call predecessors, (27), 1 states have call successors, (27) [2021-11-25 18:52:27,665 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:52:27,665 INFO L93 Difference]: Finished difference Result 27220 states and 44397 transitions. [2021-11-25 18:52:27,666 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 18:52:27,666 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 18.6) internal successors, (93), 4 states have internal predecessors, (93), 2 states have call successors, (28), 2 states have call predecessors, (28), 2 states have return successors, (27), 2 states have call predecessors, (27), 1 states have call successors, (27) Word has length 173 [2021-11-25 18:52:27,666 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:52:27,829 INFO L225 Difference]: With dead ends: 27220 [2021-11-25 18:52:27,829 INFO L226 Difference]: Without dead ends: 27201 [2021-11-25 18:52:27,854 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 184 GetRequests, 175 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=22, Invalid=88, Unknown=0, NotChecked=0, Total=110 [2021-11-25 18:52:27,855 INFO L933 BasicCegarLoop]: 575 mSDtfsCounter, 544 mSDsluCounter, 814 mSDsCounter, 0 mSdLazyCounter, 534 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 552 SdHoareTripleChecker+Valid, 1317 SdHoareTripleChecker+Invalid, 542 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 534 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 18:52:27,856 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [552 Valid, 1317 Invalid, 542 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 534 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 18:52:27,882 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27201 states. [2021-11-25 18:52:29,094 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27201 to 27031. [2021-11-25 18:52:29,110 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27031 states, 19884 states have (on average 1.5332930999798833) internal successors, (30488), 20607 states have internal predecessors, (30488), 5114 states have call successors, (5114), 1781 states have call predecessors, (5114), 2032 states have return successors, (8436), 4845 states have call predecessors, (8436), 5109 states have call successors, (8436) [2021-11-25 18:52:29,252 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27031 states to 27031 states and 44038 transitions. [2021-11-25 18:52:29,254 INFO L78 Accepts]: Start accepts. Automaton has 27031 states and 44038 transitions. Word has length 173 [2021-11-25 18:52:29,254 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:52:29,254 INFO L470 AbstractCegarLoop]: Abstraction has 27031 states and 44038 transitions. [2021-11-25 18:52:29,254 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 18.6) internal successors, (93), 4 states have internal predecessors, (93), 2 states have call successors, (28), 2 states have call predecessors, (28), 2 states have return successors, (27), 2 states have call predecessors, (27), 1 states have call successors, (27) [2021-11-25 18:52:29,255 INFO L276 IsEmpty]: Start isEmpty. Operand 27031 states and 44038 transitions. [2021-11-25 18:52:29,264 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 179 [2021-11-25 18:52:29,265 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:52:29,265 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:52:29,294 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb524a7c-3169-41a1-9cec-c542633b6551/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-25 18:52:29,477 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb524a7c-3169-41a1-9cec-c542633b6551/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-11-25 18:52:29,478 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:52:29,478 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:52:29,478 INFO L85 PathProgramCache]: Analyzing trace with hash -1872040340, now seen corresponding path program 1 times [2021-11-25 18:52:29,479 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:52:29,479 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1511599671] [2021-11-25 18:52:29,479 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:52:29,479 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:52:29,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:52:29,638 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 12 proven. 8 refuted. 0 times theorem prover too weak. 61 trivial. 0 not checked. [2021-11-25 18:52:29,638 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:52:29,639 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1511599671] [2021-11-25 18:52:29,639 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1511599671] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:52:29,639 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [651196771] [2021-11-25 18:52:29,639 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:52:29,640 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:52:29,640 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb524a7c-3169-41a1-9cec-c542633b6551/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:52:29,646 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb524a7c-3169-41a1-9cec-c542633b6551/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:52:29,664 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb524a7c-3169-41a1-9cec-c542633b6551/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-25 18:52:29,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:52:29,998 INFO L263 TraceCheckSpWp]: Trace formula consists of 2131 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-25 18:52:30,003 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:52:30,343 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 79 trivial. 0 not checked. [2021-11-25 18:52:30,343 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:52:30,344 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [651196771] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:52:30,344 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 18:52:30,344 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [8] total 12 [2021-11-25 18:52:30,344 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [747468166] [2021-11-25 18:52:30,344 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:52:30,345 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-25 18:52:30,345 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:52:30,345 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-25 18:52:30,345 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=110, Unknown=0, NotChecked=0, Total=132 [2021-11-25 18:52:30,345 INFO L87 Difference]: Start difference. First operand 27031 states and 44038 transitions. Second operand has 6 states, 5 states have (on average 19.4) internal successors, (97), 5 states have internal predecessors, (97), 3 states have call successors, (29), 3 states have call predecessors, (29), 4 states have return successors, (28), 4 states have call predecessors, (28), 2 states have call successors, (28) [2021-11-25 18:52:31,648 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:52:31,649 INFO L93 Difference]: Finished difference Result 28773 states and 47258 transitions. [2021-11-25 18:52:31,649 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-25 18:52:31,649 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 19.4) internal successors, (97), 5 states have internal predecessors, (97), 3 states have call successors, (29), 3 states have call predecessors, (29), 4 states have return successors, (28), 4 states have call predecessors, (28), 2 states have call successors, (28) Word has length 178 [2021-11-25 18:52:31,649 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:52:31,762 INFO L225 Difference]: With dead ends: 28773 [2021-11-25 18:52:31,762 INFO L226 Difference]: Without dead ends: 28687 [2021-11-25 18:52:31,779 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 192 GetRequests, 179 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=37, Invalid=173, Unknown=0, NotChecked=0, Total=210 [2021-11-25 18:52:31,780 INFO L933 BasicCegarLoop]: 587 mSDtfsCounter, 519 mSDsluCounter, 1755 mSDsCounter, 0 mSdLazyCounter, 392 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 521 SdHoareTripleChecker+Valid, 2223 SdHoareTripleChecker+Invalid, 411 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 392 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 18:52:31,780 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [521 Valid, 2223 Invalid, 411 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 392 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 18:52:31,800 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28687 states. [2021-11-25 18:52:32,871 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28687 to 28082. [2021-11-25 18:52:32,894 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28082 states, 20662 states have (on average 1.5279256606330462) internal successors, (31570), 21401 states have internal predecessors, (31570), 5274 states have call successors, (5274), 1878 states have call predecessors, (5274), 2145 states have return successors, (9480), 5005 states have call predecessors, (9480), 5269 states have call successors, (9480) [2021-11-25 18:52:33,148 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28082 states to 28082 states and 46324 transitions. [2021-11-25 18:52:33,150 INFO L78 Accepts]: Start accepts. Automaton has 28082 states and 46324 transitions. Word has length 178 [2021-11-25 18:52:33,150 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:52:33,151 INFO L470 AbstractCegarLoop]: Abstraction has 28082 states and 46324 transitions. [2021-11-25 18:52:33,151 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 19.4) internal successors, (97), 5 states have internal predecessors, (97), 3 states have call successors, (29), 3 states have call predecessors, (29), 4 states have return successors, (28), 4 states have call predecessors, (28), 2 states have call successors, (28) [2021-11-25 18:52:33,151 INFO L276 IsEmpty]: Start isEmpty. Operand 28082 states and 46324 transitions. [2021-11-25 18:52:33,159 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 186 [2021-11-25 18:52:33,159 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:52:33,159 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:52:33,189 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb524a7c-3169-41a1-9cec-c542633b6551/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-25 18:52:33,373 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb524a7c-3169-41a1-9cec-c542633b6551/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-11-25 18:52:33,374 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:52:33,374 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:52:33,375 INFO L85 PathProgramCache]: Analyzing trace with hash 796773575, now seen corresponding path program 1 times [2021-11-25 18:52:33,375 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:52:33,375 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [61375502] [2021-11-25 18:52:33,375 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:52:33,375 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:52:33,429 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:52:33,532 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 12 proven. 8 refuted. 0 times theorem prover too weak. 65 trivial. 0 not checked. [2021-11-25 18:52:33,532 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:52:33,532 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [61375502] [2021-11-25 18:52:33,532 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [61375502] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:52:33,533 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [843013260] [2021-11-25 18:52:33,533 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:52:33,533 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:52:33,534 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb524a7c-3169-41a1-9cec-c542633b6551/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:52:33,535 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb524a7c-3169-41a1-9cec-c542633b6551/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:52:33,555 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb524a7c-3169-41a1-9cec-c542633b6551/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-25 18:52:33,925 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:52:33,932 INFO L263 TraceCheckSpWp]: Trace formula consists of 2161 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-25 18:52:33,936 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:52:34,217 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 85 trivial. 0 not checked. [2021-11-25 18:52:34,218 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:52:34,218 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [843013260] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:52:34,218 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 18:52:34,218 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [8] total 10 [2021-11-25 18:52:34,218 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1025637137] [2021-11-25 18:52:34,219 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:52:34,219 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 18:52:34,219 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:52:34,220 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 18:52:34,220 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2021-11-25 18:52:34,220 INFO L87 Difference]: Start difference. First operand 28082 states and 46324 transitions. Second operand has 4 states, 4 states have (on average 25.0) internal successors, (100), 4 states have internal predecessors, (100), 2 states have call successors, (30), 2 states have call predecessors, (30), 2 states have return successors, (29), 2 states have call predecessors, (29), 1 states have call successors, (29) [2021-11-25 18:52:35,403 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:52:35,403 INFO L93 Difference]: Finished difference Result 29046 states and 51201 transitions. [2021-11-25 18:52:35,403 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 18:52:35,404 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 25.0) internal successors, (100), 4 states have internal predecessors, (100), 2 states have call successors, (30), 2 states have call predecessors, (30), 2 states have return successors, (29), 2 states have call predecessors, (29), 1 states have call successors, (29) Word has length 185 [2021-11-25 18:52:35,404 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:52:35,522 INFO L225 Difference]: With dead ends: 29046 [2021-11-25 18:52:35,522 INFO L226 Difference]: Without dead ends: 28960 [2021-11-25 18:52:35,540 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 198 GetRequests, 189 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=89, Unknown=0, NotChecked=0, Total=110 [2021-11-25 18:52:35,541 INFO L933 BasicCegarLoop]: 612 mSDtfsCounter, 47 mSDsluCounter, 1244 mSDsCounter, 0 mSdLazyCounter, 126 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 54 SdHoareTripleChecker+Valid, 1783 SdHoareTripleChecker+Invalid, 138 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 126 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:52:35,541 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [54 Valid, 1783 Invalid, 138 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 126 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:52:35,561 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28960 states. [2021-11-25 18:52:36,753 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28960 to 28218. [2021-11-25 18:52:36,779 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28218 states, 20798 states have (on average 1.5244735070679873) internal successors, (31706), 21537 states have internal predecessors, (31706), 5274 states have call successors, (5274), 1878 states have call predecessors, (5274), 2145 states have return successors, (9480), 5005 states have call predecessors, (9480), 5269 states have call successors, (9480) [2021-11-25 18:52:37,089 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28218 states to 28218 states and 46460 transitions. [2021-11-25 18:52:37,091 INFO L78 Accepts]: Start accepts. Automaton has 28218 states and 46460 transitions. Word has length 185 [2021-11-25 18:52:37,092 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:52:37,092 INFO L470 AbstractCegarLoop]: Abstraction has 28218 states and 46460 transitions. [2021-11-25 18:52:37,092 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 25.0) internal successors, (100), 4 states have internal predecessors, (100), 2 states have call successors, (30), 2 states have call predecessors, (30), 2 states have return successors, (29), 2 states have call predecessors, (29), 1 states have call successors, (29) [2021-11-25 18:52:37,092 INFO L276 IsEmpty]: Start isEmpty. Operand 28218 states and 46460 transitions. [2021-11-25 18:52:37,100 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 309 [2021-11-25 18:52:37,101 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:52:37,101 INFO L514 BasicCegarLoop]: trace histogram [12, 12, 8, 6, 5, 4, 4, 4, 4, 4, 4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:52:37,127 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb524a7c-3169-41a1-9cec-c542633b6551/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-25 18:52:37,302 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb524a7c-3169-41a1-9cec-c542633b6551/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:52:37,303 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:52:37,303 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:52:37,303 INFO L85 PathProgramCache]: Analyzing trace with hash 1273015513, now seen corresponding path program 1 times [2021-11-25 18:52:37,303 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:52:37,304 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1751137343] [2021-11-25 18:52:37,304 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:52:37,304 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:52:37,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:52:37,499 INFO L134 CoverageAnalysis]: Checked inductivity of 445 backedges. 12 proven. 87 refuted. 0 times theorem prover too weak. 346 trivial. 0 not checked. [2021-11-25 18:52:37,499 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:52:37,500 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1751137343] [2021-11-25 18:52:37,500 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1751137343] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:52:37,500 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1954460109] [2021-11-25 18:52:37,500 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:52:37,500 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:52:37,501 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb524a7c-3169-41a1-9cec-c542633b6551/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:52:37,501 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb524a7c-3169-41a1-9cec-c542633b6551/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:52:37,517 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb524a7c-3169-41a1-9cec-c542633b6551/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-25 18:52:37,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:52:37,922 INFO L263 TraceCheckSpWp]: Trace formula consists of 2965 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-25 18:52:37,930 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:52:38,577 INFO L134 CoverageAnalysis]: Checked inductivity of 445 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 443 trivial. 0 not checked. [2021-11-25 18:52:38,578 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:52:39,379 INFO L134 CoverageAnalysis]: Checked inductivity of 445 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 443 trivial. 0 not checked. [2021-11-25 18:52:39,379 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1954460109] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:52:39,379 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [903084672] [2021-11-25 18:52:39,415 INFO L159 IcfgInterpreter]: Started Sifa with 149 locations of interest [2021-11-25 18:52:39,415 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:52:39,433 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:52:39,439 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:52:39,439 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:52:50,833 INFO L197 IcfgInterpreter]: Interpreting procedure __automaton_fail with input of size 422 for LOIs [2021-11-25 18:52:50,904 INFO L197 IcfgInterpreter]: Interpreting procedure cleanup with input of size 598 for LOIs [2021-11-25 18:53:07,492 INFO L197 IcfgInterpreter]: Interpreting procedure timeShift with input of size 727 for LOIs [2021-11-25 18:53:11,616 INFO L197 IcfgInterpreter]: Interpreting procedure timeShift__wrappee__executivefloor with input of size 199 for LOIs