./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/eca-rers2012/Problem03_label36.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_6226998b-1245-48d4-8ebb-feca8c6c8741/bin/utaipan-eEHZpOm5b7/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6226998b-1245-48d4-8ebb-feca8c6c8741/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_6226998b-1245-48d4-8ebb-feca8c6c8741/bin/utaipan-eEHZpOm5b7/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6226998b-1245-48d4-8ebb-feca8c6c8741/bin/utaipan-eEHZpOm5b7/config/TaipanReach.xml -i ../../sv-benchmarks/c/eca-rers2012/Problem03_label36.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6226998b-1245-48d4-8ebb-feca8c6c8741/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_6226998b-1245-48d4-8ebb-feca8c6c8741/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 62e9241ba979767c8bca2756b2edfc882f7b20aa81fc6f783856c8cd54d80552 --- Real Ultimate output --- This is Ultimate 0.2.2-hotfix-svcomp22-839c364 [2021-11-25 19:54:18,726 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-25 19:54:18,730 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-25 19:54:18,795 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-25 19:54:18,796 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-25 19:54:18,802 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-25 19:54:18,804 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-25 19:54:18,808 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-25 19:54:18,811 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-25 19:54:18,820 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-25 19:54:18,821 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-25 19:54:18,824 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-25 19:54:18,824 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-25 19:54:18,827 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-25 19:54:18,830 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-25 19:54:18,837 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-25 19:54:18,839 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-25 19:54:18,840 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-25 19:54:18,842 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-25 19:54:18,850 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-25 19:54:18,852 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-25 19:54:18,854 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-25 19:54:18,857 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-25 19:54:18,859 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-25 19:54:18,866 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-25 19:54:18,866 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-25 19:54:18,867 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-25 19:54:18,869 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-25 19:54:18,870 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-25 19:54:18,871 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-25 19:54:18,872 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-25 19:54:18,873 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-25 19:54:18,875 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-25 19:54:18,876 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-25 19:54:18,878 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-25 19:54:18,878 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-25 19:54:18,879 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-25 19:54:18,879 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-25 19:54:18,880 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-25 19:54:18,881 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-25 19:54:18,881 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-25 19:54:18,883 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6226998b-1245-48d4-8ebb-feca8c6c8741/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-25 19:54:18,938 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-25 19:54:18,939 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-25 19:54:18,939 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-25 19:54:18,940 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-25 19:54:18,947 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-25 19:54:18,948 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-25 19:54:18,948 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-25 19:54:18,948 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-25 19:54:18,948 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-25 19:54:18,949 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-25 19:54:18,950 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-25 19:54:18,950 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-25 19:54:18,950 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-25 19:54:18,951 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-25 19:54:18,951 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-25 19:54:18,951 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-25 19:54:18,951 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-25 19:54:18,952 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-25 19:54:18,953 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-25 19:54:18,953 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-25 19:54:18,954 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-25 19:54:18,954 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-25 19:54:18,954 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-25 19:54:18,954 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-25 19:54:18,954 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-25 19:54:18,955 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-25 19:54:18,957 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-25 19:54:18,957 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-25 19:54:18,957 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-25 19:54:18,958 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-25 19:54:18,958 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-25 19:54:18,958 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-25 19:54:18,959 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 19:54:18,959 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-25 19:54:18,959 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-25 19:54:18,959 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-25 19:54:18,959 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-25 19:54:18,960 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-25 19:54:18,960 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-25 19:54:18,960 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-25 19:54:18,960 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-25 19:54:18,960 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_6226998b-1245-48d4-8ebb-feca8c6c8741/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6226998b-1245-48d4-8ebb-feca8c6c8741/bin/utaipan-eEHZpOm5b7 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 62e9241ba979767c8bca2756b2edfc882f7b20aa81fc6f783856c8cd54d80552 [2021-11-25 19:54:19,264 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-25 19:54:19,297 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-25 19:54:19,302 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-25 19:54:19,303 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-25 19:54:19,304 INFO L275 PluginConnector]: CDTParser initialized [2021-11-25 19:54:19,306 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6226998b-1245-48d4-8ebb-feca8c6c8741/bin/utaipan-eEHZpOm5b7/../../sv-benchmarks/c/eca-rers2012/Problem03_label36.c [2021-11-25 19:54:19,403 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6226998b-1245-48d4-8ebb-feca8c6c8741/bin/utaipan-eEHZpOm5b7/data/c37c10dfc/06c1116c8ce2488aa1b9c3c0550190a7/FLAGac4d20898 [2021-11-25 19:54:20,184 INFO L306 CDTParser]: Found 1 translation units. [2021-11-25 19:54:20,185 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6226998b-1245-48d4-8ebb-feca8c6c8741/sv-benchmarks/c/eca-rers2012/Problem03_label36.c [2021-11-25 19:54:20,209 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6226998b-1245-48d4-8ebb-feca8c6c8741/bin/utaipan-eEHZpOm5b7/data/c37c10dfc/06c1116c8ce2488aa1b9c3c0550190a7/FLAGac4d20898 [2021-11-25 19:54:20,306 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6226998b-1245-48d4-8ebb-feca8c6c8741/bin/utaipan-eEHZpOm5b7/data/c37c10dfc/06c1116c8ce2488aa1b9c3c0550190a7 [2021-11-25 19:54:20,312 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-25 19:54:20,314 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-25 19:54:20,318 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-25 19:54:20,319 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-25 19:54:20,323 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-25 19:54:20,323 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 07:54:20" (1/1) ... [2021-11-25 19:54:20,327 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1e2088e3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:54:20, skipping insertion in model container [2021-11-25 19:54:20,328 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 07:54:20" (1/1) ... [2021-11-25 19:54:20,336 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-25 19:54:20,431 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-25 19:54:21,173 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_6226998b-1245-48d4-8ebb-feca8c6c8741/sv-benchmarks/c/eca-rers2012/Problem03_label36.c[58393,58406] [2021-11-25 19:54:21,216 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 19:54:21,227 INFO L203 MainTranslator]: Completed pre-run [2021-11-25 19:54:21,542 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_6226998b-1245-48d4-8ebb-feca8c6c8741/sv-benchmarks/c/eca-rers2012/Problem03_label36.c[58393,58406] [2021-11-25 19:54:21,559 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 19:54:21,606 INFO L208 MainTranslator]: Completed translation [2021-11-25 19:54:21,607 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:54:21 WrapperNode [2021-11-25 19:54:21,607 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-25 19:54:21,608 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-25 19:54:21,609 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-25 19:54:21,609 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-25 19:54:21,629 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:54:21" (1/1) ... [2021-11-25 19:54:21,669 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:54:21" (1/1) ... [2021-11-25 19:54:21,757 INFO L137 Inliner]: procedures = 14, calls = 8, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 1771 [2021-11-25 19:54:21,757 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-25 19:54:21,758 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-25 19:54:21,759 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-25 19:54:21,759 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-25 19:54:21,768 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:54:21" (1/1) ... [2021-11-25 19:54:21,769 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:54:21" (1/1) ... [2021-11-25 19:54:21,780 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:54:21" (1/1) ... [2021-11-25 19:54:21,780 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:54:21" (1/1) ... [2021-11-25 19:54:21,838 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:54:21" (1/1) ... [2021-11-25 19:54:21,854 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:54:21" (1/1) ... [2021-11-25 19:54:21,867 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:54:21" (1/1) ... [2021-11-25 19:54:21,884 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-25 19:54:21,885 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-25 19:54:21,885 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-25 19:54:21,885 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-25 19:54:21,887 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:54:21" (1/1) ... [2021-11-25 19:54:21,894 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 19:54:21,909 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6226998b-1245-48d4-8ebb-feca8c6c8741/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:54:21,921 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6226998b-1245-48d4-8ebb-feca8c6c8741/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-25 19:54:21,968 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6226998b-1245-48d4-8ebb-feca8c6c8741/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-25 19:54:22,015 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-25 19:54:22,015 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-25 19:54:22,015 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-25 19:54:22,015 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-25 19:54:22,113 INFO L236 CfgBuilder]: Building ICFG [2021-11-25 19:54:22,115 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-25 19:54:24,163 INFO L277 CfgBuilder]: Performing block encoding [2021-11-25 19:54:24,484 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-25 19:54:24,485 INFO L301 CfgBuilder]: Removed 1 assume(true) statements. [2021-11-25 19:54:24,488 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 07:54:24 BoogieIcfgContainer [2021-11-25 19:54:24,489 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-25 19:54:24,491 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-25 19:54:24,491 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-25 19:54:24,495 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-25 19:54:24,495 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 07:54:20" (1/3) ... [2021-11-25 19:54:24,496 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4d894dc4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 07:54:24, skipping insertion in model container [2021-11-25 19:54:24,496 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:54:21" (2/3) ... [2021-11-25 19:54:24,497 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4d894dc4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 07:54:24, skipping insertion in model container [2021-11-25 19:54:24,497 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 07:54:24" (3/3) ... [2021-11-25 19:54:24,498 INFO L111 eAbstractionObserver]: Analyzing ICFG Problem03_label36.c [2021-11-25 19:54:24,505 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-25 19:54:24,505 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-25 19:54:24,577 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-25 19:54:24,590 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-25 19:54:24,590 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-25 19:54:24,625 INFO L276 IsEmpty]: Start isEmpty. Operand has 148 states, 146 states have (on average 1.9726027397260273) internal successors, (288), 147 states have internal predecessors, (288), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:54:24,652 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2021-11-25 19:54:24,653 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:54:24,654 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 19:54:24,654 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:54:24,661 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:54:24,662 INFO L85 PathProgramCache]: Analyzing trace with hash -1724860424, now seen corresponding path program 1 times [2021-11-25 19:54:24,673 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:54:24,675 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [222111580] [2021-11-25 19:54:24,675 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:54:24,676 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:54:25,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:54:25,408 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:54:25,409 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:54:25,409 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [222111580] [2021-11-25 19:54:25,410 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [222111580] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:54:25,410 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:54:25,411 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-25 19:54:25,413 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1586502940] [2021-11-25 19:54:25,414 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:54:25,422 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 19:54:25,423 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:54:25,472 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 19:54:25,474 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 19:54:25,480 INFO L87 Difference]: Start difference. First operand has 148 states, 146 states have (on average 1.9726027397260273) internal successors, (288), 147 states have internal predecessors, (288), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 47.666666666666664) internal successors, (143), 2 states have internal predecessors, (143), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:54:26,786 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:54:26,787 INFO L93 Difference]: Finished difference Result 440 states and 860 transitions. [2021-11-25 19:54:26,788 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 19:54:26,790 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 47.666666666666664) internal successors, (143), 2 states have internal predecessors, (143), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 143 [2021-11-25 19:54:26,791 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:54:26,820 INFO L225 Difference]: With dead ends: 440 [2021-11-25 19:54:26,820 INFO L226 Difference]: Without dead ends: 289 [2021-11-25 19:54:26,826 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 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 19:54:26,832 INFO L933 BasicCegarLoop]: 46 mSDtfsCounter, 29 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 490 mSolverCounterSat, 94 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 51 SdHoareTripleChecker+Invalid, 584 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 94 IncrementalHoareTripleChecker+Valid, 490 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2021-11-25 19:54:26,833 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [29 Valid, 51 Invalid, 584 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [94 Valid, 490 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2021-11-25 19:54:26,857 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 289 states. [2021-11-25 19:54:26,936 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 289 to 289. [2021-11-25 19:54:26,939 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 289 states, 288 states have (on average 1.7881944444444444) internal successors, (515), 288 states have internal predecessors, (515), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:54:26,941 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 289 states to 289 states and 515 transitions. [2021-11-25 19:54:26,943 INFO L78 Accepts]: Start accepts. Automaton has 289 states and 515 transitions. Word has length 143 [2021-11-25 19:54:26,949 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:54:26,949 INFO L470 AbstractCegarLoop]: Abstraction has 289 states and 515 transitions. [2021-11-25 19:54:26,949 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 47.666666666666664) internal successors, (143), 2 states have internal predecessors, (143), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:54:26,950 INFO L276 IsEmpty]: Start isEmpty. Operand 289 states and 515 transitions. [2021-11-25 19:54:26,965 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 152 [2021-11-25 19:54:26,965 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:54:26,966 INFO L514 BasicCegarLoop]: trace histogram [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 19:54:26,966 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-25 19:54:26,966 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:54:26,967 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:54:26,968 INFO L85 PathProgramCache]: Analyzing trace with hash 1817676695, now seen corresponding path program 1 times [2021-11-25 19:54:26,968 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:54:26,968 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1232839349] [2021-11-25 19:54:26,969 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:54:26,969 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:54:27,040 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:54:27,132 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:54:27,132 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:54:27,133 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1232839349] [2021-11-25 19:54:27,133 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1232839349] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:54:27,133 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:54:27,134 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-25 19:54:27,134 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [81532541] [2021-11-25 19:54:27,134 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:54:27,136 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 19:54:27,138 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:54:27,139 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 19:54:27,139 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 19:54:27,140 INFO L87 Difference]: Start difference. First operand 289 states and 515 transitions. Second operand has 3 states, 3 states have (on average 50.333333333333336) internal successors, (151), 2 states have internal predecessors, (151), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:54:27,896 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:54:27,896 INFO L93 Difference]: Finished difference Result 863 states and 1542 transitions. [2021-11-25 19:54:27,897 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 19:54:27,897 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 50.333333333333336) internal successors, (151), 2 states have internal predecessors, (151), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 151 [2021-11-25 19:54:27,897 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:54:27,901 INFO L225 Difference]: With dead ends: 863 [2021-11-25 19:54:27,901 INFO L226 Difference]: Without dead ends: 575 [2021-11-25 19:54:27,903 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 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 19:54:27,905 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 159 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 452 mSolverCounterSat, 170 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 159 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 622 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 170 IncrementalHoareTripleChecker+Valid, 452 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-25 19:54:27,906 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [159 Valid, 23 Invalid, 622 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [170 Valid, 452 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-25 19:54:27,908 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 575 states. [2021-11-25 19:54:27,931 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 575 to 575. [2021-11-25 19:54:27,933 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 575 states, 574 states have (on average 1.7421602787456445) internal successors, (1000), 574 states have internal predecessors, (1000), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:54:27,935 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 575 states to 575 states and 1000 transitions. [2021-11-25 19:54:27,936 INFO L78 Accepts]: Start accepts. Automaton has 575 states and 1000 transitions. Word has length 151 [2021-11-25 19:54:27,936 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:54:27,936 INFO L470 AbstractCegarLoop]: Abstraction has 575 states and 1000 transitions. [2021-11-25 19:54:27,937 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 50.333333333333336) internal successors, (151), 2 states have internal predecessors, (151), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:54:27,937 INFO L276 IsEmpty]: Start isEmpty. Operand 575 states and 1000 transitions. [2021-11-25 19:54:27,939 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 159 [2021-11-25 19:54:27,940 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:54:27,940 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 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 19:54:27,940 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-25 19:54:27,940 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:54:27,941 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:54:27,941 INFO L85 PathProgramCache]: Analyzing trace with hash 733016954, now seen corresponding path program 1 times [2021-11-25 19:54:27,942 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:54:27,942 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [174554043] [2021-11-25 19:54:27,942 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:54:27,942 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:54:28,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:54:28,318 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 19:54:28,318 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:54:28,319 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [174554043] [2021-11-25 19:54:28,319 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [174554043] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:54:28,321 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:54:28,321 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 19:54:28,321 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [361821343] [2021-11-25 19:54:28,322 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:54:28,323 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 19:54:28,324 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:54:28,324 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 19:54:28,325 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-25 19:54:28,325 INFO L87 Difference]: Start difference. First operand 575 states and 1000 transitions. Second operand has 4 states, 4 states have (on average 38.25) internal successors, (153), 3 states have internal predecessors, (153), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:54:29,159 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:54:29,159 INFO L93 Difference]: Finished difference Result 1290 states and 2262 transitions. [2021-11-25 19:54:29,160 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 19:54:29,160 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 38.25) internal successors, (153), 3 states have internal predecessors, (153), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 158 [2021-11-25 19:54:29,161 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:54:29,164 INFO L225 Difference]: With dead ends: 1290 [2021-11-25 19:54:29,165 INFO L226 Difference]: Without dead ends: 575 [2021-11-25 19:54:29,166 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-25 19:54:29,168 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 220 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 637 mSolverCounterSat, 173 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 220 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 810 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 173 IncrementalHoareTripleChecker+Valid, 637 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-25 19:54:29,169 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [220 Valid, 11 Invalid, 810 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [173 Valid, 637 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-25 19:54:29,170 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 575 states. [2021-11-25 19:54:29,202 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 575 to 575. [2021-11-25 19:54:29,203 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 575 states, 574 states have (on average 1.519163763066202) internal successors, (872), 574 states have internal predecessors, (872), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:54:29,206 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 575 states to 575 states and 872 transitions. [2021-11-25 19:54:29,206 INFO L78 Accepts]: Start accepts. Automaton has 575 states and 872 transitions. Word has length 158 [2021-11-25 19:54:29,207 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:54:29,207 INFO L470 AbstractCegarLoop]: Abstraction has 575 states and 872 transitions. [2021-11-25 19:54:29,207 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 38.25) internal successors, (153), 3 states have internal predecessors, (153), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:54:29,208 INFO L276 IsEmpty]: Start isEmpty. Operand 575 states and 872 transitions. [2021-11-25 19:54:29,210 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 167 [2021-11-25 19:54:29,211 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:54:29,211 INFO L514 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 19:54:29,211 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-25 19:54:29,211 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:54:29,212 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:54:29,212 INFO L85 PathProgramCache]: Analyzing trace with hash -2058061037, now seen corresponding path program 1 times [2021-11-25 19:54:29,212 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:54:29,213 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1474840552] [2021-11-25 19:54:29,213 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:54:29,213 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:54:29,273 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:54:29,345 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 22 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:54:29,345 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:54:29,346 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1474840552] [2021-11-25 19:54:29,346 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1474840552] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:54:29,346 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:54:29,346 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-25 19:54:29,347 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2069298909] [2021-11-25 19:54:29,347 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:54:29,348 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 19:54:29,348 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:54:29,349 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 19:54:29,349 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 19:54:29,349 INFO L87 Difference]: Start difference. First operand 575 states and 872 transitions. Second operand has 3 states, 3 states have (on average 55.333333333333336) internal successors, (166), 2 states have internal predecessors, (166), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:54:29,935 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:54:29,935 INFO L93 Difference]: Finished difference Result 1723 states and 2614 transitions. [2021-11-25 19:54:29,937 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 19:54:29,938 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 55.333333333333336) internal successors, (166), 2 states have internal predecessors, (166), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 166 [2021-11-25 19:54:29,938 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:54:29,943 INFO L225 Difference]: With dead ends: 1723 [2021-11-25 19:54:29,943 INFO L226 Difference]: Without dead ends: 1149 [2021-11-25 19:54:29,945 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 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 19:54:29,947 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 159 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 458 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 159 SdHoareTripleChecker+Valid, 12 SdHoareTripleChecker+Invalid, 467 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 458 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-25 19:54:29,948 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [159 Valid, 12 Invalid, 467 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 458 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-25 19:54:29,950 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1149 states. [2021-11-25 19:54:29,978 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1149 to 1147. [2021-11-25 19:54:29,981 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1147 states, 1146 states have (on average 1.506108202443281) internal successors, (1726), 1146 states have internal predecessors, (1726), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:54:29,987 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1147 states to 1147 states and 1726 transitions. [2021-11-25 19:54:29,987 INFO L78 Accepts]: Start accepts. Automaton has 1147 states and 1726 transitions. Word has length 166 [2021-11-25 19:54:29,987 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:54:29,988 INFO L470 AbstractCegarLoop]: Abstraction has 1147 states and 1726 transitions. [2021-11-25 19:54:29,988 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 55.333333333333336) internal successors, (166), 2 states have internal predecessors, (166), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:54:29,988 INFO L276 IsEmpty]: Start isEmpty. Operand 1147 states and 1726 transitions. [2021-11-25 19:54:29,992 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 170 [2021-11-25 19:54:29,993 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:54:29,993 INFO L514 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 19:54:29,993 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-25 19:54:29,993 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:54:29,994 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:54:29,994 INFO L85 PathProgramCache]: Analyzing trace with hash 1145013059, now seen corresponding path program 1 times [2021-11-25 19:54:29,994 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:54:29,995 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1005604713] [2021-11-25 19:54:29,995 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:54:29,995 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:54:30,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:54:30,081 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 25 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:54:30,082 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:54:30,083 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1005604713] [2021-11-25 19:54:30,084 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1005604713] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:54:30,084 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:54:30,084 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-25 19:54:30,084 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1750783983] [2021-11-25 19:54:30,086 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:54:30,087 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 19:54:30,088 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:54:30,088 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 19:54:30,089 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 19:54:30,089 INFO L87 Difference]: Start difference. First operand 1147 states and 1726 transitions. Second operand has 3 states, 3 states have (on average 56.333333333333336) internal successors, (169), 2 states have internal predecessors, (169), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:54:30,698 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:54:30,698 INFO L93 Difference]: Finished difference Result 3439 states and 5176 transitions. [2021-11-25 19:54:30,698 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 19:54:30,699 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 56.333333333333336) internal successors, (169), 2 states have internal predecessors, (169), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 169 [2021-11-25 19:54:30,699 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:54:30,713 INFO L225 Difference]: With dead ends: 3439 [2021-11-25 19:54:30,714 INFO L226 Difference]: Without dead ends: 2293 [2021-11-25 19:54:30,716 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 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 19:54:30,725 INFO L933 BasicCegarLoop]: 56 mSDtfsCounter, 131 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 432 mSolverCounterSat, 35 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 131 SdHoareTripleChecker+Valid, 72 SdHoareTripleChecker+Invalid, 467 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 432 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-25 19:54:30,727 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [131 Valid, 72 Invalid, 467 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [35 Valid, 432 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-25 19:54:30,732 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2293 states. [2021-11-25 19:54:30,818 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2293 to 2291. [2021-11-25 19:54:30,823 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2291 states, 2290 states have (on average 1.485589519650655) internal successors, (3402), 2290 states have internal predecessors, (3402), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:54:30,834 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2291 states to 2291 states and 3402 transitions. [2021-11-25 19:54:30,835 INFO L78 Accepts]: Start accepts. Automaton has 2291 states and 3402 transitions. Word has length 169 [2021-11-25 19:54:30,836 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:54:30,836 INFO L470 AbstractCegarLoop]: Abstraction has 2291 states and 3402 transitions. [2021-11-25 19:54:30,837 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 56.333333333333336) internal successors, (169), 2 states have internal predecessors, (169), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:54:30,837 INFO L276 IsEmpty]: Start isEmpty. Operand 2291 states and 3402 transitions. [2021-11-25 19:54:30,844 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 172 [2021-11-25 19:54:30,850 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:54:30,850 INFO L514 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 19:54:30,850 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-25 19:54:30,851 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:54:30,852 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:54:30,852 INFO L85 PathProgramCache]: Analyzing trace with hash -1836474018, now seen corresponding path program 1 times [2021-11-25 19:54:30,852 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:54:30,852 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1133448930] [2021-11-25 19:54:30,852 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:54:30,853 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:54:30,907 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:54:30,969 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 27 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:54:30,969 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:54:30,970 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1133448930] [2021-11-25 19:54:30,970 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1133448930] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:54:30,970 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:54:30,970 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-25 19:54:30,971 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1639386642] [2021-11-25 19:54:30,971 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:54:30,972 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 19:54:30,972 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:54:30,972 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 19:54:30,973 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 19:54:30,973 INFO L87 Difference]: Start difference. First operand 2291 states and 3402 transitions. Second operand has 3 states, 3 states have (on average 57.0) internal successors, (171), 2 states have internal predecessors, (171), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:54:31,778 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:54:31,778 INFO L93 Difference]: Finished difference Result 6869 states and 10203 transitions. [2021-11-25 19:54:31,779 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 19:54:31,779 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 57.0) internal successors, (171), 2 states have internal predecessors, (171), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 171 [2021-11-25 19:54:31,779 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:54:31,811 INFO L225 Difference]: With dead ends: 6869 [2021-11-25 19:54:31,812 INFO L226 Difference]: Without dead ends: 4579 [2021-11-25 19:54:31,816 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 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 19:54:31,817 INFO L933 BasicCegarLoop]: 41 mSDtfsCounter, 132 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 459 mSolverCounterSat, 43 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 132 SdHoareTripleChecker+Valid, 45 SdHoareTripleChecker+Invalid, 502 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 43 IncrementalHoareTripleChecker+Valid, 459 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-25 19:54:31,817 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [132 Valid, 45 Invalid, 502 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [43 Valid, 459 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-25 19:54:31,825 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4579 states. [2021-11-25 19:54:31,948 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4579 to 4579. [2021-11-25 19:54:31,958 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4579 states, 4578 states have (on average 1.453473132372215) internal successors, (6654), 4578 states have internal predecessors, (6654), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:54:31,980 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4579 states to 4579 states and 6654 transitions. [2021-11-25 19:54:31,981 INFO L78 Accepts]: Start accepts. Automaton has 4579 states and 6654 transitions. Word has length 171 [2021-11-25 19:54:31,981 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:54:31,981 INFO L470 AbstractCegarLoop]: Abstraction has 4579 states and 6654 transitions. [2021-11-25 19:54:31,981 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 57.0) internal successors, (171), 2 states have internal predecessors, (171), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:54:31,982 INFO L276 IsEmpty]: Start isEmpty. Operand 4579 states and 6654 transitions. [2021-11-25 19:54:31,993 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 174 [2021-11-25 19:54:31,993 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:54:31,994 INFO L514 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 19:54:31,994 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-25 19:54:31,994 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:54:31,994 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:54:31,995 INFO L85 PathProgramCache]: Analyzing trace with hash 284031865, now seen corresponding path program 1 times [2021-11-25 19:54:31,995 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:54:31,995 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [436070332] [2021-11-25 19:54:31,995 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:54:31,995 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:54:32,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:54:32,130 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 29 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:54:32,130 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:54:32,130 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [436070332] [2021-11-25 19:54:32,130 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [436070332] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:54:32,131 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:54:32,131 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-25 19:54:32,131 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [623366587] [2021-11-25 19:54:32,131 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:54:32,131 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 19:54:32,131 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:54:32,132 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 19:54:32,132 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 19:54:32,132 INFO L87 Difference]: Start difference. First operand 4579 states and 6654 transitions. Second operand has 3 states, 3 states have (on average 57.666666666666664) internal successors, (173), 2 states have internal predecessors, (173), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:54:32,963 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:54:32,963 INFO L93 Difference]: Finished difference Result 13163 states and 19138 transitions. [2021-11-25 19:54:32,964 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 19:54:32,964 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 57.666666666666664) internal successors, (173), 2 states have internal predecessors, (173), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 173 [2021-11-25 19:54:32,964 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:54:33,026 INFO L225 Difference]: With dead ends: 13163 [2021-11-25 19:54:33,027 INFO L226 Difference]: Without dead ends: 8585 [2021-11-25 19:54:33,035 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 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 19:54:33,039 INFO L933 BasicCegarLoop]: 51 mSDtfsCounter, 128 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 476 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 128 SdHoareTripleChecker+Valid, 60 SdHoareTripleChecker+Invalid, 488 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 476 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-25 19:54:33,039 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [128 Valid, 60 Invalid, 488 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 476 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-25 19:54:33,053 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8585 states. [2021-11-25 19:54:33,306 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8585 to 8583. [2021-11-25 19:54:33,327 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8583 states, 8582 states have (on average 1.4469820554649266) internal successors, (12418), 8582 states have internal predecessors, (12418), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:54:33,363 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8583 states to 8583 states and 12418 transitions. [2021-11-25 19:54:33,363 INFO L78 Accepts]: Start accepts. Automaton has 8583 states and 12418 transitions. Word has length 173 [2021-11-25 19:54:33,364 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:54:33,365 INFO L470 AbstractCegarLoop]: Abstraction has 8583 states and 12418 transitions. [2021-11-25 19:54:33,365 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 57.666666666666664) internal successors, (173), 2 states have internal predecessors, (173), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:54:33,365 INFO L276 IsEmpty]: Start isEmpty. Operand 8583 states and 12418 transitions. [2021-11-25 19:54:33,381 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 177 [2021-11-25 19:54:33,382 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:54:33,382 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 19:54:33,382 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-25 19:54:33,383 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:54:33,385 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:54:33,385 INFO L85 PathProgramCache]: Analyzing trace with hash 354461945, now seen corresponding path program 1 times [2021-11-25 19:54:33,385 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:54:33,385 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1134066855] [2021-11-25 19:54:33,386 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:54:33,386 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:54:33,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:54:33,532 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 18 proven. 0 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2021-11-25 19:54:33,532 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:54:33,532 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1134066855] [2021-11-25 19:54:33,532 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1134066855] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:54:33,533 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:54:33,533 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-25 19:54:33,533 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2139845177] [2021-11-25 19:54:33,533 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:54:33,534 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 19:54:33,534 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:54:33,535 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 19:54:33,535 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 19:54:33,535 INFO L87 Difference]: Start difference. First operand 8583 states and 12418 transitions. Second operand has 3 states, 3 states have (on average 51.333333333333336) internal successors, (154), 2 states have internal predecessors, (154), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:54:34,375 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:54:34,375 INFO L93 Difference]: Finished difference Result 21455 states and 30953 transitions. [2021-11-25 19:54:34,375 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 19:54:34,376 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 51.333333333333336) internal successors, (154), 2 states have internal predecessors, (154), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 176 [2021-11-25 19:54:34,376 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:54:34,455 INFO L225 Difference]: With dead ends: 21455 [2021-11-25 19:54:34,455 INFO L226 Difference]: Without dead ends: 12873 [2021-11-25 19:54:34,468 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 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 19:54:34,469 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 152 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 410 mSolverCounterSat, 84 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 152 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 494 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 84 IncrementalHoareTripleChecker+Valid, 410 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-25 19:54:34,470 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [152 Valid, 19 Invalid, 494 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [84 Valid, 410 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-25 19:54:34,494 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12873 states. [2021-11-25 19:54:34,790 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12873 to 12873. [2021-11-25 19:54:34,823 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12873 states, 12872 states have (on average 1.4260410192666253) internal successors, (18356), 12872 states have internal predecessors, (18356), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:54:34,860 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12873 states to 12873 states and 18356 transitions. [2021-11-25 19:54:34,860 INFO L78 Accepts]: Start accepts. Automaton has 12873 states and 18356 transitions. Word has length 176 [2021-11-25 19:54:34,862 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:54:34,862 INFO L470 AbstractCegarLoop]: Abstraction has 12873 states and 18356 transitions. [2021-11-25 19:54:34,863 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 51.333333333333336) internal successors, (154), 2 states have internal predecessors, (154), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:54:34,863 INFO L276 IsEmpty]: Start isEmpty. Operand 12873 states and 18356 transitions. [2021-11-25 19:54:34,878 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 179 [2021-11-25 19:54:34,879 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:54:34,879 INFO L514 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 19:54:34,879 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-25 19:54:34,879 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:54:34,880 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:54:34,880 INFO L85 PathProgramCache]: Analyzing trace with hash -1321191210, now seen corresponding path program 1 times [2021-11-25 19:54:34,880 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:54:34,880 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [268966648] [2021-11-25 19:54:34,880 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:54:34,881 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:54:34,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:54:34,979 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 37 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:54:34,979 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:54:34,980 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [268966648] [2021-11-25 19:54:34,980 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [268966648] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:54:34,980 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:54:34,980 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 19:54:34,980 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [371420263] [2021-11-25 19:54:34,981 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:54:34,981 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 19:54:34,982 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:54:34,982 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 19:54:34,982 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 19:54:34,983 INFO L87 Difference]: Start difference. First operand 12873 states and 18356 transitions. Second operand has 3 states, 3 states have (on average 59.333333333333336) internal successors, (178), 3 states have internal predecessors, (178), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:54:35,776 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:54:35,777 INFO L93 Difference]: Finished difference Result 28891 states and 41309 transitions. [2021-11-25 19:54:35,777 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 19:54:35,777 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 59.333333333333336) internal successors, (178), 3 states have internal predecessors, (178), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 178 [2021-11-25 19:54:35,778 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:54:35,818 INFO L225 Difference]: With dead ends: 28891 [2021-11-25 19:54:35,819 INFO L226 Difference]: Without dead ends: 16019 [2021-11-25 19:54:35,835 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 19:54:35,838 INFO L933 BasicCegarLoop]: 208 mSDtfsCounter, 142 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 414 mSolverCounterSat, 78 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 142 SdHoareTripleChecker+Valid, 212 SdHoareTripleChecker+Invalid, 492 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 78 IncrementalHoareTripleChecker+Valid, 414 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-25 19:54:35,838 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [142 Valid, 212 Invalid, 492 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [78 Valid, 414 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-25 19:54:35,863 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16019 states. [2021-11-25 19:54:36,163 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16019 to 16019. [2021-11-25 19:54:36,190 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16019 states, 16018 states have (on average 1.378886252965414) internal successors, (22087), 16018 states have internal predecessors, (22087), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:54:36,344 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16019 states to 16019 states and 22087 transitions. [2021-11-25 19:54:36,355 INFO L78 Accepts]: Start accepts. Automaton has 16019 states and 22087 transitions. Word has length 178 [2021-11-25 19:54:36,356 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:54:36,356 INFO L470 AbstractCegarLoop]: Abstraction has 16019 states and 22087 transitions. [2021-11-25 19:54:36,356 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 59.333333333333336) internal successors, (178), 3 states have internal predecessors, (178), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:54:36,357 INFO L276 IsEmpty]: Start isEmpty. Operand 16019 states and 22087 transitions. [2021-11-25 19:54:36,378 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 189 [2021-11-25 19:54:36,379 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:54:36,379 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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] [2021-11-25 19:54:36,379 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-11-25 19:54:36,379 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:54:36,380 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:54:36,380 INFO L85 PathProgramCache]: Analyzing trace with hash 1381035560, now seen corresponding path program 1 times [2021-11-25 19:54:36,380 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:54:36,381 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [653016791] [2021-11-25 19:54:36,381 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:54:36,381 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:54:36,433 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:54:36,479 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 36 proven. 0 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-25 19:54:36,479 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:54:36,479 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [653016791] [2021-11-25 19:54:36,479 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [653016791] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:54:36,480 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:54:36,480 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-25 19:54:36,480 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [15630092] [2021-11-25 19:54:36,480 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:54:36,481 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 19:54:36,481 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:54:36,481 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 19:54:36,481 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 19:54:36,482 INFO L87 Difference]: Start difference. First operand 16019 states and 22087 transitions. Second operand has 3 states, 3 states have (on average 54.333333333333336) internal successors, (163), 2 states have internal predecessors, (163), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:54:37,409 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:54:37,410 INFO L93 Difference]: Finished difference Result 36756 states and 50605 transitions. [2021-11-25 19:54:37,410 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 19:54:37,410 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 54.333333333333336) internal successors, (163), 2 states have internal predecessors, (163), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 188 [2021-11-25 19:54:37,410 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:54:37,457 INFO L225 Difference]: With dead ends: 36756 [2021-11-25 19:54:37,457 INFO L226 Difference]: Without dead ends: 20738 [2021-11-25 19:54:37,477 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 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 19:54:37,478 INFO L933 BasicCegarLoop]: 56 mSDtfsCounter, 127 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 446 mSolverCounterSat, 46 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 127 SdHoareTripleChecker+Valid, 60 SdHoareTripleChecker+Invalid, 492 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 46 IncrementalHoareTripleChecker+Valid, 446 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-25 19:54:37,479 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [127 Valid, 60 Invalid, 492 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [46 Valid, 446 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-25 19:54:37,510 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20738 states. [2021-11-25 19:54:37,874 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20738 to 20738. [2021-11-25 19:54:37,907 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20738 states, 20737 states have (on average 1.3513526546752181) internal successors, (28023), 20737 states have internal predecessors, (28023), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:54:37,954 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20738 states to 20738 states and 28023 transitions. [2021-11-25 19:54:37,954 INFO L78 Accepts]: Start accepts. Automaton has 20738 states and 28023 transitions. Word has length 188 [2021-11-25 19:54:37,955 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:54:37,955 INFO L470 AbstractCegarLoop]: Abstraction has 20738 states and 28023 transitions. [2021-11-25 19:54:37,955 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 54.333333333333336) internal successors, (163), 2 states have internal predecessors, (163), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:54:37,955 INFO L276 IsEmpty]: Start isEmpty. Operand 20738 states and 28023 transitions. [2021-11-25 19:54:37,983 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 196 [2021-11-25 19:54:37,983 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:54:37,983 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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] [2021-11-25 19:54:37,984 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-11-25 19:54:37,984 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:54:37,984 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:54:37,985 INFO L85 PathProgramCache]: Analyzing trace with hash -270743515, now seen corresponding path program 1 times [2021-11-25 19:54:37,985 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:54:37,985 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [71559149] [2021-11-25 19:54:37,985 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:54:37,986 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:54:38,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:54:38,111 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 50 proven. 6 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-25 19:54:38,111 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:54:38,111 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [71559149] [2021-11-25 19:54:38,111 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [71559149] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:54:38,112 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [917464020] [2021-11-25 19:54:38,112 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:54:38,112 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:54:38,112 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6226998b-1245-48d4-8ebb-feca8c6c8741/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:54:38,114 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6226998b-1245-48d4-8ebb-feca8c6c8741/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:54:38,189 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6226998b-1245-48d4-8ebb-feca8c6c8741/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-25 19:54:38,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:54:38,416 INFO L263 TraceCheckSpWp]: Trace formula consists of 482 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-25 19:54:38,441 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:54:38,940 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 50 proven. 0 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-25 19:54:38,944 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:54:38,945 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [917464020] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:54:38,945 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 19:54:38,945 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [3] total 4 [2021-11-25 19:54:38,946 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [312382405] [2021-11-25 19:54:38,946 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:54:38,947 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 19:54:38,947 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:54:38,948 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 19:54:38,948 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-25 19:54:38,949 INFO L87 Difference]: Start difference. First operand 20738 states and 28023 transitions. Second operand has 3 states, 3 states have (on average 55.0) internal successors, (165), 2 states have internal predecessors, (165), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:54:39,972 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:54:39,972 INFO L93 Difference]: Finished difference Result 46909 states and 63931 transitions. [2021-11-25 19:54:39,973 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 19:54:39,973 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 55.0) internal successors, (165), 2 states have internal predecessors, (165), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 195 [2021-11-25 19:54:39,973 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:54:40,046 INFO L225 Difference]: With dead ends: 46909 [2021-11-25 19:54:40,047 INFO L226 Difference]: Without dead ends: 26315 [2021-11-25 19:54:40,073 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 197 GetRequests, 194 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-25 19:54:40,074 INFO L933 BasicCegarLoop]: 62 mSDtfsCounter, 136 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 364 mSolverCounterSat, 116 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 136 SdHoareTripleChecker+Valid, 65 SdHoareTripleChecker+Invalid, 480 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 116 IncrementalHoareTripleChecker+Valid, 364 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-25 19:54:40,074 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [136 Valid, 65 Invalid, 480 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [116 Valid, 364 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-25 19:54:40,103 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26315 states. [2021-11-25 19:54:40,661 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26315 to 26315. [2021-11-25 19:54:40,690 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26315 states, 26314 states have (on average 1.2202249752983203) internal successors, (32109), 26314 states have internal predecessors, (32109), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:54:40,751 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26315 states to 26315 states and 32109 transitions. [2021-11-25 19:54:40,752 INFO L78 Accepts]: Start accepts. Automaton has 26315 states and 32109 transitions. Word has length 195 [2021-11-25 19:54:40,752 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:54:40,752 INFO L470 AbstractCegarLoop]: Abstraction has 26315 states and 32109 transitions. [2021-11-25 19:54:40,752 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 55.0) internal successors, (165), 2 states have internal predecessors, (165), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:54:40,753 INFO L276 IsEmpty]: Start isEmpty. Operand 26315 states and 32109 transitions. [2021-11-25 19:54:40,875 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 206 [2021-11-25 19:54:40,876 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:54:40,879 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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] [2021-11-25 19:54:40,939 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6226998b-1245-48d4-8ebb-feca8c6c8741/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-25 19:54:41,088 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6226998b-1245-48d4-8ebb-feca8c6c8741/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:54:41,089 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:54:41,089 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:54:41,089 INFO L85 PathProgramCache]: Analyzing trace with hash 1583359125, now seen corresponding path program 1 times [2021-11-25 19:54:41,089 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:54:41,090 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1106773211] [2021-11-25 19:54:41,090 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:54:41,090 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:54:41,149 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:54:41,224 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 60 proven. 0 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-25 19:54:41,224 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:54:41,224 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1106773211] [2021-11-25 19:54:41,225 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1106773211] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:54:41,225 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:54:41,225 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-25 19:54:41,225 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1709624295] [2021-11-25 19:54:41,225 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:54:41,226 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 19:54:41,226 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:54:41,226 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 19:54:41,227 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 19:54:41,227 INFO L87 Difference]: Start difference. First operand 26315 states and 32109 transitions. Second operand has 3 states, 3 states have (on average 59.333333333333336) internal successors, (178), 2 states have internal predecessors, (178), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:54:42,059 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:54:42,059 INFO L93 Difference]: Finished difference Result 55920 states and 67969 transitions. [2021-11-25 19:54:42,060 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 19:54:42,060 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 59.333333333333336) internal successors, (178), 2 states have internal predecessors, (178), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 205 [2021-11-25 19:54:42,060 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:54:42,120 INFO L225 Difference]: With dead ends: 55920 [2021-11-25 19:54:42,121 INFO L226 Difference]: Without dead ends: 30035 [2021-11-25 19:54:42,136 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 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 19:54:42,137 INFO L933 BasicCegarLoop]: 71 mSDtfsCounter, 120 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 406 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 120 SdHoareTripleChecker+Valid, 75 SdHoareTripleChecker+Invalid, 411 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 406 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-25 19:54:42,137 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [120 Valid, 75 Invalid, 411 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 406 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-25 19:54:42,166 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30035 states. [2021-11-25 19:54:42,785 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30035 to 30033. [2021-11-25 19:54:42,827 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30033 states, 30032 states have (on average 1.2083111347895579) internal successors, (36288), 30032 states have internal predecessors, (36288), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:54:42,908 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30033 states to 30033 states and 36288 transitions. [2021-11-25 19:54:42,908 INFO L78 Accepts]: Start accepts. Automaton has 30033 states and 36288 transitions. Word has length 205 [2021-11-25 19:54:42,909 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:54:42,909 INFO L470 AbstractCegarLoop]: Abstraction has 30033 states and 36288 transitions. [2021-11-25 19:54:42,909 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 59.333333333333336) internal successors, (178), 2 states have internal predecessors, (178), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:54:42,910 INFO L276 IsEmpty]: Start isEmpty. Operand 30033 states and 36288 transitions. [2021-11-25 19:54:42,954 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 218 [2021-11-25 19:54:42,954 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:54:42,955 INFO L514 BasicCegarLoop]: trace histogram [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, 1, 1] [2021-11-25 19:54:42,955 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-11-25 19:54:42,955 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:54:42,956 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:54:42,956 INFO L85 PathProgramCache]: Analyzing trace with hash 1791334084, now seen corresponding path program 1 times [2021-11-25 19:54:42,956 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:54:42,957 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [644004548] [2021-11-25 19:54:42,957 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:54:42,957 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:54:43,038 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:54:43,124 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 73 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:54:43,124 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:54:43,124 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [644004548] [2021-11-25 19:54:43,124 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [644004548] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:54:43,125 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:54:43,125 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-25 19:54:43,125 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1845033047] [2021-11-25 19:54:43,125 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:54:43,126 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 19:54:43,126 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:54:43,127 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 19:54:43,127 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 19:54:43,127 INFO L87 Difference]: Start difference. First operand 30033 states and 36288 transitions. Second operand has 3 states, 3 states have (on average 72.33333333333333) internal successors, (217), 2 states have internal predecessors, (217), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:54:44,177 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:54:44,177 INFO L93 Difference]: Finished difference Result 58778 states and 71158 transitions. [2021-11-25 19:54:44,178 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 19:54:44,178 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 72.33333333333333) internal successors, (217), 2 states have internal predecessors, (217), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 217 [2021-11-25 19:54:44,178 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:54:44,265 INFO L225 Difference]: With dead ends: 58778 [2021-11-25 19:54:44,265 INFO L226 Difference]: Without dead ends: 30176 [2021-11-25 19:54:44,292 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 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 19:54:44,300 INFO L933 BasicCegarLoop]: 77 mSDtfsCounter, 72 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 396 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 72 SdHoareTripleChecker+Valid, 81 SdHoareTripleChecker+Invalid, 403 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 396 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-25 19:54:44,301 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [72 Valid, 81 Invalid, 403 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 396 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-25 19:54:44,331 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30176 states. [2021-11-25 19:54:44,890 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30176 to 30176. [2021-11-25 19:54:44,923 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30176 states, 30175 states have (on average 1.2075227837613918) internal successors, (36437), 30175 states have internal predecessors, (36437), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:54:44,992 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30176 states to 30176 states and 36437 transitions. [2021-11-25 19:54:44,993 INFO L78 Accepts]: Start accepts. Automaton has 30176 states and 36437 transitions. Word has length 217 [2021-11-25 19:54:44,993 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:54:44,993 INFO L470 AbstractCegarLoop]: Abstraction has 30176 states and 36437 transitions. [2021-11-25 19:54:44,994 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 72.33333333333333) internal successors, (217), 2 states have internal predecessors, (217), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:54:44,994 INFO L276 IsEmpty]: Start isEmpty. Operand 30176 states and 36437 transitions. [2021-11-25 19:54:45,021 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 244 [2021-11-25 19:54:45,022 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:54:45,022 INFO L514 BasicCegarLoop]: trace histogram [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, 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] [2021-11-25 19:54:45,022 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2021-11-25 19:54:45,023 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:54:45,023 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:54:45,023 INFO L85 PathProgramCache]: Analyzing trace with hash 1783146724, now seen corresponding path program 1 times [2021-11-25 19:54:45,024 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:54:45,024 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1053067306] [2021-11-25 19:54:45,024 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:54:45,024 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:54:45,098 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:54:45,189 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 99 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:54:45,189 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:54:45,189 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1053067306] [2021-11-25 19:54:45,190 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1053067306] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:54:45,190 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [579948321] [2021-11-25 19:54:45,190 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:54:45,190 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:54:45,191 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6226998b-1245-48d4-8ebb-feca8c6c8741/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:54:45,192 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6226998b-1245-48d4-8ebb-feca8c6c8741/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:54:45,220 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6226998b-1245-48d4-8ebb-feca8c6c8741/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-25 19:54:45,402 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:54:45,405 INFO L263 TraceCheckSpWp]: Trace formula consists of 481 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-25 19:54:45,413 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:54:46,122 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 98 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-25 19:54:46,123 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:54:46,123 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [579948321] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:54:46,123 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 19:54:46,123 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3] total 5 [2021-11-25 19:54:46,127 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1211340385] [2021-11-25 19:54:46,127 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:54:46,128 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 19:54:46,128 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:54:46,128 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 19:54:46,129 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-25 19:54:46,129 INFO L87 Difference]: Start difference. First operand 30176 states and 36437 transitions. Second operand has 3 states, 3 states have (on average 80.0) internal successors, (240), 3 states have internal predecessors, (240), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:54:47,107 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:54:47,107 INFO L93 Difference]: Finished difference Result 57634 states and 70285 transitions. [2021-11-25 19:54:47,108 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 19:54:47,108 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 80.0) internal successors, (240), 3 states have internal predecessors, (240), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 243 [2021-11-25 19:54:47,109 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:54:47,177 INFO L225 Difference]: With dead ends: 57634 [2021-11-25 19:54:47,177 INFO L226 Difference]: Without dead ends: 31749 [2021-11-25 19:54:47,195 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 245 GetRequests, 242 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-25 19:54:47,196 INFO L933 BasicCegarLoop]: 171 mSDtfsCounter, 42 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 432 mSolverCounterSat, 49 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 175 SdHoareTripleChecker+Invalid, 481 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 49 IncrementalHoareTripleChecker+Valid, 432 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-25 19:54:47,197 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [42 Valid, 175 Invalid, 481 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [49 Valid, 432 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-25 19:54:47,232 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31749 states. [2021-11-25 19:54:47,835 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31749 to 31749. [2021-11-25 19:54:47,864 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31749 states, 31748 states have (on average 1.2047688043341314) internal successors, (38249), 31748 states have internal predecessors, (38249), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:54:48,170 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31749 states to 31749 states and 38249 transitions. [2021-11-25 19:54:48,171 INFO L78 Accepts]: Start accepts. Automaton has 31749 states and 38249 transitions. Word has length 243 [2021-11-25 19:54:48,171 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:54:48,171 INFO L470 AbstractCegarLoop]: Abstraction has 31749 states and 38249 transitions. [2021-11-25 19:54:48,172 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 80.0) internal successors, (240), 3 states have internal predecessors, (240), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:54:48,172 INFO L276 IsEmpty]: Start isEmpty. Operand 31749 states and 38249 transitions. [2021-11-25 19:54:48,196 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 253 [2021-11-25 19:54:48,197 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:54:48,197 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 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] [2021-11-25 19:54:48,238 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6226998b-1245-48d4-8ebb-feca8c6c8741/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2021-11-25 19:54:48,412 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6226998b-1245-48d4-8ebb-feca8c6c8741/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:54:48,412 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:54:48,413 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:54:48,413 INFO L85 PathProgramCache]: Analyzing trace with hash 1952880410, now seen corresponding path program 1 times [2021-11-25 19:54:48,413 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:54:48,413 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1462093519] [2021-11-25 19:54:48,413 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:54:48,413 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:54:48,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:54:48,551 INFO L134 CoverageAnalysis]: Checked inductivity of 217 backedges. 110 proven. 6 refuted. 0 times theorem prover too weak. 101 trivial. 0 not checked. [2021-11-25 19:54:48,551 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:54:48,552 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1462093519] [2021-11-25 19:54:48,552 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1462093519] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:54:48,552 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [917534082] [2021-11-25 19:54:48,552 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:54:48,552 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:54:48,553 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6226998b-1245-48d4-8ebb-feca8c6c8741/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:54:48,553 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6226998b-1245-48d4-8ebb-feca8c6c8741/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:54:48,573 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6226998b-1245-48d4-8ebb-feca8c6c8741/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-25 19:54:48,775 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:54:48,778 INFO L263 TraceCheckSpWp]: Trace formula consists of 571 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-25 19:54:48,784 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:54:49,301 INFO L134 CoverageAnalysis]: Checked inductivity of 217 backedges. 108 proven. 0 refuted. 0 times theorem prover too weak. 109 trivial. 0 not checked. [2021-11-25 19:54:49,301 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:54:49,301 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [917534082] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:54:49,301 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 19:54:49,302 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3] total 5 [2021-11-25 19:54:49,302 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [63930876] [2021-11-25 19:54:49,302 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:54:49,303 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 19:54:49,303 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:54:49,303 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 19:54:49,303 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-25 19:54:49,304 INFO L87 Difference]: Start difference. First operand 31749 states and 38249 transitions. Second operand has 3 states, 3 states have (on average 62.666666666666664) internal successors, (188), 3 states have internal predecessors, (188), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:54:50,099 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:54:50,100 INFO L93 Difference]: Finished difference Result 60351 states and 72636 transitions. [2021-11-25 19:54:50,100 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 19:54:50,100 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 62.666666666666664) internal successors, (188), 3 states have internal predecessors, (188), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 252 [2021-11-25 19:54:50,101 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:54:50,158 INFO L225 Difference]: With dead ends: 60351 [2021-11-25 19:54:50,158 INFO L226 Difference]: Without dead ends: 29032 [2021-11-25 19:54:50,175 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 254 GetRequests, 251 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-25 19:54:50,176 INFO L933 BasicCegarLoop]: 210 mSDtfsCounter, 9 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 458 mSolverCounterSat, 47 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 214 SdHoareTripleChecker+Invalid, 505 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 47 IncrementalHoareTripleChecker+Valid, 458 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-25 19:54:50,177 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 214 Invalid, 505 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [47 Valid, 458 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-25 19:54:50,208 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29032 states. [2021-11-25 19:54:50,702 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29032 to 29032. [2021-11-25 19:54:50,722 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29032 states, 29031 states have (on average 1.1895559918707588) internal successors, (34534), 29031 states have internal predecessors, (34534), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:54:50,961 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29032 states to 29032 states and 34534 transitions. [2021-11-25 19:54:50,961 INFO L78 Accepts]: Start accepts. Automaton has 29032 states and 34534 transitions. Word has length 252 [2021-11-25 19:54:50,962 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:54:50,962 INFO L470 AbstractCegarLoop]: Abstraction has 29032 states and 34534 transitions. [2021-11-25 19:54:50,962 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 62.666666666666664) internal successors, (188), 3 states have internal predecessors, (188), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:54:50,962 INFO L276 IsEmpty]: Start isEmpty. Operand 29032 states and 34534 transitions. [2021-11-25 19:54:50,986 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 253 [2021-11-25 19:54:50,987 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:54:50,988 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 19:54:51,030 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6226998b-1245-48d4-8ebb-feca8c6c8741/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-25 19:54:51,216 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6226998b-1245-48d4-8ebb-feca8c6c8741/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-11-25 19:54:51,216 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:54:51,216 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:54:51,217 INFO L85 PathProgramCache]: Analyzing trace with hash -858130575, now seen corresponding path program 1 times [2021-11-25 19:54:51,217 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:54:51,217 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1622908472] [2021-11-25 19:54:51,217 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:54:51,217 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:54:51,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:54:51,393 INFO L134 CoverageAnalysis]: Checked inductivity of 151 backedges. 74 proven. 6 refuted. 0 times theorem prover too weak. 71 trivial. 0 not checked. [2021-11-25 19:54:51,393 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:54:51,394 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1622908472] [2021-11-25 19:54:51,394 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1622908472] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:54:51,394 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [613523919] [2021-11-25 19:54:51,394 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:54:51,395 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:54:51,395 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6226998b-1245-48d4-8ebb-feca8c6c8741/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:54:51,396 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6226998b-1245-48d4-8ebb-feca8c6c8741/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:54:51,421 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6226998b-1245-48d4-8ebb-feca8c6c8741/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-25 19:54:51,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:54:51,619 INFO L263 TraceCheckSpWp]: Trace formula consists of 525 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-25 19:54:51,627 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:54:52,155 INFO L134 CoverageAnalysis]: Checked inductivity of 151 backedges. 108 proven. 0 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2021-11-25 19:54:52,155 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:54:52,155 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [613523919] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:54:52,156 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 19:54:52,156 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3] total 5 [2021-11-25 19:54:52,156 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [627827001] [2021-11-25 19:54:52,157 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:54:52,157 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 19:54:52,158 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:54:52,158 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 19:54:52,158 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-25 19:54:52,159 INFO L87 Difference]: Start difference. First operand 29032 states and 34534 transitions. Second operand has 3 states, 3 states have (on average 72.33333333333333) internal successors, (217), 3 states have internal predecessors, (217), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:54:53,071 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:54:53,071 INFO L93 Difference]: Finished difference Result 57062 states and 68377 transitions. [2021-11-25 19:54:53,071 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 19:54:53,072 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 72.33333333333333) internal successors, (217), 3 states have internal predecessors, (217), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 252 [2021-11-25 19:54:53,075 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:54:53,122 INFO L225 Difference]: With dead ends: 57062 [2021-11-25 19:54:53,122 INFO L226 Difference]: Without dead ends: 29461 [2021-11-25 19:54:53,134 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 254 GetRequests, 251 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-25 19:54:53,135 INFO L933 BasicCegarLoop]: 221 mSDtfsCounter, 10 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 379 mSolverCounterSat, 85 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 237 SdHoareTripleChecker+Invalid, 464 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 85 IncrementalHoareTripleChecker+Valid, 379 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-25 19:54:53,136 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 237 Invalid, 464 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [85 Valid, 379 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-25 19:54:53,167 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29461 states. [2021-11-25 19:54:53,634 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29461 to 29461. [2021-11-25 19:54:53,650 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29461 states, 29460 states have (on average 1.1911065852002716) internal successors, (35090), 29460 states have internal predecessors, (35090), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:54:53,691 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29461 states to 29461 states and 35090 transitions. [2021-11-25 19:54:53,691 INFO L78 Accepts]: Start accepts. Automaton has 29461 states and 35090 transitions. Word has length 252 [2021-11-25 19:54:53,691 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:54:53,692 INFO L470 AbstractCegarLoop]: Abstraction has 29461 states and 35090 transitions. [2021-11-25 19:54:53,692 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 72.33333333333333) internal successors, (217), 3 states have internal predecessors, (217), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:54:53,692 INFO L276 IsEmpty]: Start isEmpty. Operand 29461 states and 35090 transitions. [2021-11-25 19:54:53,718 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 259 [2021-11-25 19:54:53,718 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:54:53,719 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 19:54:53,761 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6226998b-1245-48d4-8ebb-feca8c6c8741/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2021-11-25 19:54:53,936 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6226998b-1245-48d4-8ebb-feca8c6c8741/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-11-25 19:54:53,936 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:54:53,936 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:54:53,937 INFO L85 PathProgramCache]: Analyzing trace with hash -1593752738, now seen corresponding path program 1 times [2021-11-25 19:54:53,937 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:54:53,937 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1256660115] [2021-11-25 19:54:53,937 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:54:53,937 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:54:54,027 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:54:54,132 INFO L134 CoverageAnalysis]: Checked inductivity of 203 backedges. 173 proven. 0 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-25 19:54:54,132 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:54:54,132 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1256660115] [2021-11-25 19:54:54,132 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1256660115] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:54:54,132 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:54:54,133 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 19:54:54,133 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [30783640] [2021-11-25 19:54:54,133 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:54:54,134 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 19:54:54,134 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:54:54,135 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 19:54:54,135 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-25 19:54:54,135 INFO L87 Difference]: Start difference. First operand 29461 states and 35090 transitions. Second operand has 4 states, 4 states have (on average 57.25) internal successors, (229), 3 states have internal predecessors, (229), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:54:55,492 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:54:55,492 INFO L93 Difference]: Finished difference Result 57920 states and 69196 transitions. [2021-11-25 19:54:55,492 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 19:54:55,493 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 57.25) internal successors, (229), 3 states have internal predecessors, (229), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 258 [2021-11-25 19:54:55,493 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:54:55,530 INFO L225 Difference]: With dead ends: 57920 [2021-11-25 19:54:55,530 INFO L226 Difference]: Without dead ends: 29318 [2021-11-25 19:54:55,544 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-25 19:54:55,545 INFO L933 BasicCegarLoop]: 26 mSDtfsCounter, 226 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 765 mSolverCounterSat, 178 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 226 SdHoareTripleChecker+Valid, 33 SdHoareTripleChecker+Invalid, 943 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 178 IncrementalHoareTripleChecker+Valid, 765 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2021-11-25 19:54:55,546 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [226 Valid, 33 Invalid, 943 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [178 Valid, 765 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2021-11-25 19:54:55,576 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29318 states. [2021-11-25 19:54:56,116 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29318 to 25457. [2021-11-25 19:54:56,128 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25457 states, 25456 states have (on average 1.1964959145191703) internal successors, (30458), 25456 states have internal predecessors, (30458), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:54:56,165 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25457 states to 25457 states and 30458 transitions. [2021-11-25 19:54:56,165 INFO L78 Accepts]: Start accepts. Automaton has 25457 states and 30458 transitions. Word has length 258 [2021-11-25 19:54:56,165 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:54:56,165 INFO L470 AbstractCegarLoop]: Abstraction has 25457 states and 30458 transitions. [2021-11-25 19:54:56,165 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 57.25) internal successors, (229), 3 states have internal predecessors, (229), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:54:56,166 INFO L276 IsEmpty]: Start isEmpty. Operand 25457 states and 30458 transitions. [2021-11-25 19:54:56,181 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 266 [2021-11-25 19:54:56,181 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:54:56,181 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 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, 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 19:54:56,182 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2021-11-25 19:54:56,182 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:54:56,182 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:54:56,183 INFO L85 PathProgramCache]: Analyzing trace with hash 1601078171, now seen corresponding path program 1 times [2021-11-25 19:54:56,183 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:54:56,183 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1650326710] [2021-11-25 19:54:56,183 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:54:56,184 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:54:56,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:54:56,324 INFO L134 CoverageAnalysis]: Checked inductivity of 230 backedges. 110 proven. 6 refuted. 0 times theorem prover too weak. 114 trivial. 0 not checked. [2021-11-25 19:54:56,325 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:54:56,325 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1650326710] [2021-11-25 19:54:56,325 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1650326710] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:54:56,325 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1016634238] [2021-11-25 19:54:56,325 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:54:56,326 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:54:56,326 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6226998b-1245-48d4-8ebb-feca8c6c8741/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:54:56,327 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6226998b-1245-48d4-8ebb-feca8c6c8741/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:54:56,348 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6226998b-1245-48d4-8ebb-feca8c6c8741/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-25 19:54:56,521 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:54:56,524 INFO L263 TraceCheckSpWp]: Trace formula consists of 583 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-25 19:54:56,529 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:54:57,028 INFO L134 CoverageAnalysis]: Checked inductivity of 230 backedges. 157 proven. 0 refuted. 0 times theorem prover too weak. 73 trivial. 0 not checked. [2021-11-25 19:54:57,029 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:54:57,029 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1016634238] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:54:57,029 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 19:54:57,029 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3] total 5 [2021-11-25 19:54:57,030 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [497414668] [2021-11-25 19:54:57,030 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:54:57,031 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 19:54:57,031 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:54:57,031 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 19:54:57,031 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-25 19:54:57,031 INFO L87 Difference]: Start difference. First operand 25457 states and 30458 transitions. Second operand has 3 states, 3 states have (on average 67.0) internal successors, (201), 3 states have internal predecessors, (201), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:54:57,676 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:54:57,676 INFO L93 Difference]: Finished difference Result 52772 states and 62939 transitions. [2021-11-25 19:54:57,676 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 19:54:57,676 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 67.0) internal successors, (201), 3 states have internal predecessors, (201), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 265 [2021-11-25 19:54:57,677 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:54:57,707 INFO L225 Difference]: With dead ends: 52772 [2021-11-25 19:54:57,707 INFO L226 Difference]: Without dead ends: 27602 [2021-11-25 19:54:57,723 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 267 GetRequests, 264 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-25 19:54:57,724 INFO L933 BasicCegarLoop]: 221 mSDtfsCounter, 8 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 376 mSolverCounterSat, 38 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 225 SdHoareTripleChecker+Invalid, 414 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 38 IncrementalHoareTripleChecker+Valid, 376 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-25 19:54:57,724 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [8 Valid, 225 Invalid, 414 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [38 Valid, 376 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-25 19:54:57,747 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27602 states. [2021-11-25 19:54:58,153 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27602 to 25886. [2021-11-25 19:54:58,170 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25886 states, 25885 states have (on average 1.1621402356577168) internal successors, (30082), 25885 states have internal predecessors, (30082), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:54:58,203 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25886 states to 25886 states and 30082 transitions. [2021-11-25 19:54:58,204 INFO L78 Accepts]: Start accepts. Automaton has 25886 states and 30082 transitions. Word has length 265 [2021-11-25 19:54:58,204 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:54:58,204 INFO L470 AbstractCegarLoop]: Abstraction has 25886 states and 30082 transitions. [2021-11-25 19:54:58,204 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 67.0) internal successors, (201), 3 states have internal predecessors, (201), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:54:58,204 INFO L276 IsEmpty]: Start isEmpty. Operand 25886 states and 30082 transitions. [2021-11-25 19:54:58,219 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 287 [2021-11-25 19:54:58,219 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:54:58,220 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 3, 3, 3, 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] [2021-11-25 19:54:58,248 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6226998b-1245-48d4-8ebb-feca8c6c8741/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-25 19:54:58,420 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6226998b-1245-48d4-8ebb-feca8c6c8741/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-11-25 19:54:58,420 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:54:58,421 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:54:58,421 INFO L85 PathProgramCache]: Analyzing trace with hash -1941314701, now seen corresponding path program 1 times [2021-11-25 19:54:58,421 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:54:58,421 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1958726987] [2021-11-25 19:54:58,421 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:54:58,421 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:54:58,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:54:58,538 INFO L134 CoverageAnalysis]: Checked inductivity of 352 backedges. 147 proven. 6 refuted. 0 times theorem prover too weak. 199 trivial. 0 not checked. [2021-11-25 19:54:58,539 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:54:58,539 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1958726987] [2021-11-25 19:54:58,539 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1958726987] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:54:58,539 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [460347817] [2021-11-25 19:54:58,539 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:54:58,540 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:54:58,540 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6226998b-1245-48d4-8ebb-feca8c6c8741/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:54:58,541 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6226998b-1245-48d4-8ebb-feca8c6c8741/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:54:58,564 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6226998b-1245-48d4-8ebb-feca8c6c8741/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-25 19:54:58,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:54:58,737 INFO L263 TraceCheckSpWp]: Trace formula consists of 639 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-25 19:54:58,742 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:54:59,230 INFO L134 CoverageAnalysis]: Checked inductivity of 352 backedges. 142 proven. 0 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2021-11-25 19:54:59,231 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:54:59,231 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [460347817] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:54:59,231 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 19:54:59,231 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3] total 5 [2021-11-25 19:54:59,231 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [581811200] [2021-11-25 19:54:59,232 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:54:59,232 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 19:54:59,232 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:54:59,233 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 19:54:59,233 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-25 19:54:59,233 INFO L87 Difference]: Start difference. First operand 25886 states and 30082 transitions. Second operand has 3 states, 3 states have (on average 63.0) internal successors, (189), 3 states have internal predecessors, (189), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:55:00,030 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:55:00,030 INFO L93 Difference]: Finished difference Result 57777 states and 67574 transitions. [2021-11-25 19:55:00,030 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 19:55:00,031 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 63.0) internal successors, (189), 3 states have internal predecessors, (189), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 286 [2021-11-25 19:55:00,031 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:55:00,064 INFO L225 Difference]: With dead ends: 57777 [2021-11-25 19:55:00,064 INFO L226 Difference]: Without dead ends: 33036 [2021-11-25 19:55:00,076 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 288 GetRequests, 285 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-25 19:55:00,077 INFO L933 BasicCegarLoop]: 60 mSDtfsCounter, 28 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 453 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 64 SdHoareTripleChecker+Invalid, 482 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 453 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-25 19:55:00,078 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [28 Valid, 64 Invalid, 482 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 453 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-25 19:55:00,111 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33036 states. [2021-11-25 19:55:00,670 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33036 to 29318. [2021-11-25 19:55:00,686 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29318 states, 29317 states have (on average 1.1630112221577924) internal successors, (34096), 29317 states have internal predecessors, (34096), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:55:00,728 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29318 states to 29318 states and 34096 transitions. [2021-11-25 19:55:00,729 INFO L78 Accepts]: Start accepts. Automaton has 29318 states and 34096 transitions. Word has length 286 [2021-11-25 19:55:00,729 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:55:00,730 INFO L470 AbstractCegarLoop]: Abstraction has 29318 states and 34096 transitions. [2021-11-25 19:55:00,730 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 63.0) internal successors, (189), 3 states have internal predecessors, (189), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:55:00,730 INFO L276 IsEmpty]: Start isEmpty. Operand 29318 states and 34096 transitions. [2021-11-25 19:55:00,757 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 306 [2021-11-25 19:55:00,757 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:55:00,758 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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, 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] [2021-11-25 19:55:00,800 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6226998b-1245-48d4-8ebb-feca8c6c8741/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-25 19:55:00,984 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6226998b-1245-48d4-8ebb-feca8c6c8741/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:55:00,984 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:55:00,985 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:55:00,985 INFO L85 PathProgramCache]: Analyzing trace with hash -1177558843, now seen corresponding path program 1 times [2021-11-25 19:55:00,985 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:55:00,985 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [997415913] [2021-11-25 19:55:00,985 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:55:00,986 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:55:01,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:55:01,201 INFO L134 CoverageAnalysis]: Checked inductivity of 204 backedges. 74 proven. 6 refuted. 0 times theorem prover too weak. 124 trivial. 0 not checked. [2021-11-25 19:55:01,201 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:55:01,201 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [997415913] [2021-11-25 19:55:01,201 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [997415913] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:55:01,202 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1856283576] [2021-11-25 19:55:01,202 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:55:01,202 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:55:01,202 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6226998b-1245-48d4-8ebb-feca8c6c8741/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:55:01,203 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6226998b-1245-48d4-8ebb-feca8c6c8741/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:55:01,223 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6226998b-1245-48d4-8ebb-feca8c6c8741/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-25 19:55:01,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:55:01,393 INFO L263 TraceCheckSpWp]: Trace formula consists of 572 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-25 19:55:01,398 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:55:03,333 INFO L134 CoverageAnalysis]: Checked inductivity of 204 backedges. 161 proven. 0 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2021-11-25 19:55:03,333 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:55:03,333 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1856283576] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:55:03,334 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 19:55:03,334 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3] total 5 [2021-11-25 19:55:03,334 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1050521104] [2021-11-25 19:55:03,334 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:55:03,335 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 19:55:03,335 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:55:03,336 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 19:55:03,336 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-25 19:55:03,336 INFO L87 Difference]: Start difference. First operand 29318 states and 34096 transitions. Second operand has 3 states, 3 states have (on average 90.0) internal successors, (270), 3 states have internal predecessors, (270), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:55:04,318 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:55:04,318 INFO L93 Difference]: Finished difference Result 60780 states and 70755 transitions. [2021-11-25 19:55:04,320 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 19:55:04,320 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 90.0) internal successors, (270), 3 states have internal predecessors, (270), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 305 [2021-11-25 19:55:04,321 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:55:04,360 INFO L225 Difference]: With dead ends: 60780 [2021-11-25 19:55:04,360 INFO L226 Difference]: Without dead ends: 33465 [2021-11-25 19:55:04,374 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 307 GetRequests, 304 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-25 19:55:04,375 INFO L933 BasicCegarLoop]: 208 mSDtfsCounter, 9 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 455 mSolverCounterSat, 43 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 212 SdHoareTripleChecker+Invalid, 498 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 43 IncrementalHoareTripleChecker+Valid, 455 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-25 19:55:04,375 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 212 Invalid, 498 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [43 Valid, 455 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-25 19:55:04,403 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33465 states. [2021-11-25 19:55:04,858 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33465 to 33179. [2021-11-25 19:55:04,880 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33179 states, 33178 states have (on average 1.1543191271324371) internal successors, (38298), 33178 states have internal predecessors, (38298), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:55:04,933 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33179 states to 33179 states and 38298 transitions. [2021-11-25 19:55:04,933 INFO L78 Accepts]: Start accepts. Automaton has 33179 states and 38298 transitions. Word has length 305 [2021-11-25 19:55:04,934 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:55:04,934 INFO L470 AbstractCegarLoop]: Abstraction has 33179 states and 38298 transitions. [2021-11-25 19:55:04,934 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 90.0) internal successors, (270), 3 states have internal predecessors, (270), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:55:04,935 INFO L276 IsEmpty]: Start isEmpty. Operand 33179 states and 38298 transitions. [2021-11-25 19:55:05,092 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 316 [2021-11-25 19:55:05,092 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:55:05,093 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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] [2021-11-25 19:55:05,121 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6226998b-1245-48d4-8ebb-feca8c6c8741/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-25 19:55:05,308 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6226998b-1245-48d4-8ebb-feca8c6c8741/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:55:05,309 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:55:05,309 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:55:05,309 INFO L85 PathProgramCache]: Analyzing trace with hash -1972982572, now seen corresponding path program 1 times [2021-11-25 19:55:05,309 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:55:05,310 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [998002926] [2021-11-25 19:55:05,310 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:55:05,310 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:55:05,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:55:05,523 INFO L134 CoverageAnalysis]: Checked inductivity of 246 backedges. 246 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:55:05,523 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:55:05,524 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [998002926] [2021-11-25 19:55:05,524 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [998002926] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:55:05,524 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:55:05,524 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 19:55:05,524 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1043651178] [2021-11-25 19:55:05,524 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:55:05,525 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 19:55:05,525 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:55:05,526 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 19:55:05,528 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 19:55:05,529 INFO L87 Difference]: Start difference. First operand 33179 states and 38298 transitions. Second operand has 3 states, 3 states have (on average 105.0) internal successors, (315), 3 states have internal predecessors, (315), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:55:06,255 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:55:06,256 INFO L93 Difference]: Finished difference Result 65356 states and 75775 transitions. [2021-11-25 19:55:06,256 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 19:55:06,256 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 105.0) internal successors, (315), 3 states have internal predecessors, (315), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 315 [2021-11-25 19:55:06,257 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:55:06,291 INFO L225 Difference]: With dead ends: 65356 [2021-11-25 19:55:06,291 INFO L226 Difference]: Without dead ends: 34323 [2021-11-25 19:55:06,305 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 19:55:06,306 INFO L933 BasicCegarLoop]: 194 mSDtfsCounter, 87 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 369 mSolverCounterSat, 91 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 87 SdHoareTripleChecker+Valid, 197 SdHoareTripleChecker+Invalid, 460 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 91 IncrementalHoareTripleChecker+Valid, 369 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-25 19:55:06,306 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [87 Valid, 197 Invalid, 460 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [91 Valid, 369 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-25 19:55:06,336 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34323 states. [2021-11-25 19:55:06,850 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34323 to 34037. [2021-11-25 19:55:06,873 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34037 states, 34036 states have (on average 1.1392349277235867) internal successors, (38775), 34036 states have internal predecessors, (38775), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:55:06,916 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34037 states to 34037 states and 38775 transitions. [2021-11-25 19:55:06,916 INFO L78 Accepts]: Start accepts. Automaton has 34037 states and 38775 transitions. Word has length 315 [2021-11-25 19:55:06,917 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:55:06,917 INFO L470 AbstractCegarLoop]: Abstraction has 34037 states and 38775 transitions. [2021-11-25 19:55:06,918 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 105.0) internal successors, (315), 3 states have internal predecessors, (315), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:55:06,918 INFO L276 IsEmpty]: Start isEmpty. Operand 34037 states and 38775 transitions. [2021-11-25 19:55:06,950 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 348 [2021-11-25 19:55:06,950 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:55:06,951 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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, 1, 1, 1, 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 19:55:06,951 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2021-11-25 19:55:06,952 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:55:06,952 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:55:06,952 INFO L85 PathProgramCache]: Analyzing trace with hash -1569047773, now seen corresponding path program 1 times [2021-11-25 19:55:06,953 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:55:06,953 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [289649667] [2021-11-25 19:55:06,953 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:55:06,953 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:55:07,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:55:07,214 INFO L134 CoverageAnalysis]: Checked inductivity of 291 backedges. 203 proven. 82 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 19:55:07,214 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:55:07,214 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [289649667] [2021-11-25 19:55:07,215 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [289649667] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:55:07,215 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1382308011] [2021-11-25 19:55:07,215 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:55:07,215 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:55:07,215 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6226998b-1245-48d4-8ebb-feca8c6c8741/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:55:07,224 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6226998b-1245-48d4-8ebb-feca8c6c8741/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:55:07,240 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6226998b-1245-48d4-8ebb-feca8c6c8741/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-25 19:55:07,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:55:07,455 INFO L263 TraceCheckSpWp]: Trace formula consists of 620 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-25 19:55:07,460 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:55:08,063 INFO L134 CoverageAnalysis]: Checked inductivity of 291 backedges. 203 proven. 82 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 19:55:08,064 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:55:08,731 INFO L134 CoverageAnalysis]: Checked inductivity of 291 backedges. 203 proven. 82 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 19:55:08,732 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1382308011] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:55:08,732 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [809391298] [2021-11-25 19:55:08,781 INFO L159 IcfgInterpreter]: Started Sifa with 145 locations of interest [2021-11-25 19:55:08,781 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:55:08,788 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:55:08,798 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:55:08,798 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs