./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/recursive/recHanoi01.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version aef121e0 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87491b03-22ff-477b-a977-7367de4c7410/bin/utaipan-EQgc7hIp5V/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87491b03-22ff-477b-a977-7367de4c7410/bin/utaipan-EQgc7hIp5V/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87491b03-22ff-477b-a977-7367de4c7410/bin/utaipan-EQgc7hIp5V/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87491b03-22ff-477b-a977-7367de4c7410/bin/utaipan-EQgc7hIp5V/config/TaipanReach.xml -i ../../sv-benchmarks/c/recursive/recHanoi01.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87491b03-22ff-477b-a977-7367de4c7410/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87491b03-22ff-477b-a977-7367de4c7410/bin/utaipan-EQgc7hIp5V --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 85b02fad28964214b0cd332ac12fce3136c6c5e9247130ab67f1c2c3baea22f9 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-aef121e [2021-11-23 01:57:32,605 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 01:57:32,630 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 01:57:32,667 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 01:57:32,668 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 01:57:32,670 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 01:57:32,674 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 01:57:32,681 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 01:57:32,683 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 01:57:32,686 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 01:57:32,687 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 01:57:32,689 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 01:57:32,691 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 01:57:32,695 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 01:57:32,697 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 01:57:32,700 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 01:57:32,703 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 01:57:32,710 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 01:57:32,713 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 01:57:32,720 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 01:57:32,727 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 01:57:32,729 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 01:57:32,730 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 01:57:32,733 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 01:57:32,737 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 01:57:32,739 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 01:57:32,739 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 01:57:32,742 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 01:57:32,742 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 01:57:32,744 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 01:57:32,745 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 01:57:32,746 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 01:57:32,748 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 01:57:32,749 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 01:57:32,751 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 01:57:32,751 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 01:57:32,752 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 01:57:32,752 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 01:57:32,753 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 01:57:32,754 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 01:57:32,754 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 01:57:32,755 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87491b03-22ff-477b-a977-7367de4c7410/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-23 01:57:32,809 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 01:57:32,809 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 01:57:32,810 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 01:57:32,810 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 01:57:32,811 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 01:57:32,812 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 01:57:32,812 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 01:57:32,812 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 01:57:32,812 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 01:57:32,813 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 01:57:32,814 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 01:57:32,814 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 01:57:32,814 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 01:57:32,815 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 01:57:32,815 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 01:57:32,815 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 01:57:32,816 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 01:57:32,816 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 01:57:32,817 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 01:57:32,817 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 01:57:32,817 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 01:57:32,817 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 01:57:32,818 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 01:57:32,818 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 01:57:32,818 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 01:57:32,818 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 01:57:32,820 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 01:57:32,821 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 01:57:32,821 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 01:57:32,821 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 01:57:32,822 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 01:57:32,822 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 01:57:32,822 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 01:57:32,823 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 01:57:32,823 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 01:57:32,823 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 01:57:32,823 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 01:57:32,823 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 01:57:32,824 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 01:57:32,824 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 01:57:32,824 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 01:57:32,824 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_87491b03-22ff-477b-a977-7367de4c7410/bin/utaipan-EQgc7hIp5V/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87491b03-22ff-477b-a977-7367de4c7410/bin/utaipan-EQgc7hIp5V Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 85b02fad28964214b0cd332ac12fce3136c6c5e9247130ab67f1c2c3baea22f9 [2021-11-23 01:57:33,136 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 01:57:33,161 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 01:57:33,165 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 01:57:33,166 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 01:57:33,167 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 01:57:33,168 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87491b03-22ff-477b-a977-7367de4c7410/bin/utaipan-EQgc7hIp5V/../../sv-benchmarks/c/recursive/recHanoi01.c [2021-11-23 01:57:33,249 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87491b03-22ff-477b-a977-7367de4c7410/bin/utaipan-EQgc7hIp5V/data/d18220841/d4d54d902be34be880d1041c1fec5316/FLAG6606fa602 [2021-11-23 01:57:33,759 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 01:57:33,759 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87491b03-22ff-477b-a977-7367de4c7410/sv-benchmarks/c/recursive/recHanoi01.c [2021-11-23 01:57:33,770 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87491b03-22ff-477b-a977-7367de4c7410/bin/utaipan-EQgc7hIp5V/data/d18220841/d4d54d902be34be880d1041c1fec5316/FLAG6606fa602 [2021-11-23 01:57:34,122 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87491b03-22ff-477b-a977-7367de4c7410/bin/utaipan-EQgc7hIp5V/data/d18220841/d4d54d902be34be880d1041c1fec5316 [2021-11-23 01:57:34,124 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 01:57:34,126 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 01:57:34,127 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 01:57:34,127 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 01:57:34,134 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 01:57:34,134 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 01:57:34" (1/1) ... [2021-11-23 01:57:34,135 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1c8bfaf1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:57:34, skipping insertion in model container [2021-11-23 01:57:34,135 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 01:57:34" (1/1) ... [2021-11-23 01:57:34,145 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 01:57:34,156 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 01:57:34,374 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_87491b03-22ff-477b-a977-7367de4c7410/sv-benchmarks/c/recursive/recHanoi01.c[1213,1226] [2021-11-23 01:57:34,377 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 01:57:34,387 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 01:57:34,418 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_87491b03-22ff-477b-a977-7367de4c7410/sv-benchmarks/c/recursive/recHanoi01.c[1213,1226] [2021-11-23 01:57:34,419 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 01:57:34,435 INFO L208 MainTranslator]: Completed translation [2021-11-23 01:57:34,435 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:57:34 WrapperNode [2021-11-23 01:57:34,436 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 01:57:34,437 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 01:57:34,438 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 01:57:34,438 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 01:57:34,446 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:57:34" (1/1) ... [2021-11-23 01:57:34,454 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:57:34" (1/1) ... [2021-11-23 01:57:34,473 INFO L137 Inliner]: procedures = 14, calls = 12, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 29 [2021-11-23 01:57:34,474 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 01:57:34,475 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 01:57:34,475 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 01:57:34,476 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 01:57:34,485 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:57:34" (1/1) ... [2021-11-23 01:57:34,485 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:57:34" (1/1) ... [2021-11-23 01:57:34,500 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:57:34" (1/1) ... [2021-11-23 01:57:34,500 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:57:34" (1/1) ... [2021-11-23 01:57:34,504 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:57:34" (1/1) ... [2021-11-23 01:57:34,506 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:57:34" (1/1) ... [2021-11-23 01:57:34,507 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:57:34" (1/1) ... [2021-11-23 01:57:34,508 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 01:57:34,509 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 01:57:34,510 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 01:57:34,510 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 01:57:34,513 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:57:34" (1/1) ... [2021-11-23 01:57:34,521 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 01:57:34,532 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87491b03-22ff-477b-a977-7367de4c7410/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 01:57:34,550 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87491b03-22ff-477b-a977-7367de4c7410/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 01:57:34,585 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87491b03-22ff-477b-a977-7367de4c7410/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 01:57:34,604 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 01:57:34,604 INFO L130 BoogieDeclarations]: Found specification of procedure applyHanoi [2021-11-23 01:57:34,604 INFO L138 BoogieDeclarations]: Found implementation of procedure applyHanoi [2021-11-23 01:57:34,605 INFO L130 BoogieDeclarations]: Found specification of procedure hanoi [2021-11-23 01:57:34,605 INFO L138 BoogieDeclarations]: Found implementation of procedure hanoi [2021-11-23 01:57:34,605 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 01:57:34,605 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 01:57:34,605 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 01:57:34,676 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 01:57:34,678 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 01:57:34,810 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 01:57:34,826 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 01:57:34,827 INFO L301 CfgBuilder]: Removed 0 assume(true) statements. [2021-11-23 01:57:34,837 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 01:57:34 BoogieIcfgContainer [2021-11-23 01:57:34,837 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 01:57:34,856 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 01:57:34,856 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 01:57:34,860 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 01:57:34,860 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 01:57:34" (1/3) ... [2021-11-23 01:57:34,861 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6b6a85ad and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 01:57:34, skipping insertion in model container [2021-11-23 01:57:34,861 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:57:34" (2/3) ... [2021-11-23 01:57:34,862 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6b6a85ad and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 01:57:34, skipping insertion in model container [2021-11-23 01:57:34,862 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 01:57:34" (3/3) ... [2021-11-23 01:57:34,863 INFO L111 eAbstractionObserver]: Analyzing ICFG recHanoi01.c [2021-11-23 01:57:34,869 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 01:57:34,869 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-23 01:57:34,951 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 01:57:34,960 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 [2021-11-23 01:57:34,960 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-23 01:57:34,977 INFO L276 IsEmpty]: Start isEmpty. Operand has 22 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 15 states have internal predecessors, (18), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-11-23 01:57:34,983 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-11-23 01:57:34,984 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 01:57:34,985 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 01:57:34,985 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 01:57:34,991 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 01:57:34,992 INFO L85 PathProgramCache]: Analyzing trace with hash -432663240, now seen corresponding path program 1 times [2021-11-23 01:57:35,002 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 01:57:35,003 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2090530770] [2021-11-23 01:57:35,003 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:57:35,004 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 01:57:35,108 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:57:35,202 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 01:57:35,203 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 01:57:35,203 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2090530770] [2021-11-23 01:57:35,204 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2090530770] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 01:57:35,204 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 01:57:35,204 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 01:57:35,206 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1227732083] [2021-11-23 01:57:35,207 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 01:57:35,212 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 01:57:35,212 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 01:57:35,242 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 01:57:35,243 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 01:57:35,245 INFO L87 Difference]: Start difference. First operand has 22 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 15 states have internal predecessors, (18), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Second operand has 5 states, 4 states have (on average 2.75) internal successors, (11), 5 states have internal predecessors, (11), 2 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-23 01:57:35,327 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 01:57:35,328 INFO L93 Difference]: Finished difference Result 39 states and 48 transitions. [2021-11-23 01:57:35,329 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 01:57:35,330 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 2.75) internal successors, (11), 5 states have internal predecessors, (11), 2 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 15 [2021-11-23 01:57:35,331 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 01:57:35,340 INFO L225 Difference]: With dead ends: 39 [2021-11-23 01:57:35,340 INFO L226 Difference]: Without dead ends: 22 [2021-11-23 01:57:35,345 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-23 01:57:35,350 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 9 mSDsluCounter, 49 mSDsCounter, 0 mSdLazyCounter, 35 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 62 SdHoareTripleChecker+Invalid, 35 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 35 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 01:57:35,352 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 62 Invalid, 35 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 35 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 01:57:35,371 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2021-11-23 01:57:35,391 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2021-11-23 01:57:35,393 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 13 states have (on average 1.1538461538461537) internal successors, (15), 14 states have internal predecessors, (15), 5 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2021-11-23 01:57:35,394 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 27 transitions. [2021-11-23 01:57:35,396 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 27 transitions. Word has length 15 [2021-11-23 01:57:35,396 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 01:57:35,397 INFO L470 AbstractCegarLoop]: Abstraction has 22 states and 27 transitions. [2021-11-23 01:57:35,397 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 2.75) internal successors, (11), 5 states have internal predecessors, (11), 2 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-23 01:57:35,397 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 27 transitions. [2021-11-23 01:57:35,399 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-11-23 01:57:35,400 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 01:57:35,400 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 01:57:35,400 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-23 01:57:35,401 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 01:57:35,402 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 01:57:35,402 INFO L85 PathProgramCache]: Analyzing trace with hash -1422071395, now seen corresponding path program 1 times [2021-11-23 01:57:35,402 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 01:57:35,403 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [953418161] [2021-11-23 01:57:35,403 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:57:35,403 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 01:57:35,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:57:35,742 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 4 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 01:57:35,742 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 01:57:35,743 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [953418161] [2021-11-23 01:57:35,743 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [953418161] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 01:57:35,744 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1662055502] [2021-11-23 01:57:35,744 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:57:35,744 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 01:57:35,745 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87491b03-22ff-477b-a977-7367de4c7410/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 01:57:35,746 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87491b03-22ff-477b-a977-7367de4c7410/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 01:57:35,755 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87491b03-22ff-477b-a977-7367de4c7410/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-23 01:57:35,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:57:35,840 INFO L263 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-23 01:57:35,846 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:57:36,076 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 01:57:36,077 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:57:36,533 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 01:57:36,534 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1662055502] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:57:36,534 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1367569874] [2021-11-23 01:57:36,556 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2021-11-23 01:57:36,556 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 01:57:36,561 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-23 01:57:36,563 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 01:57:36,563 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 10] total 17 [2021-11-23 01:57:36,564 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [514011810] [2021-11-23 01:57:36,564 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 01:57:36,565 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-23 01:57:36,565 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 01:57:36,566 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-23 01:57:36,566 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2021-11-23 01:57:36,567 INFO L87 Difference]: Start difference. First operand 22 states and 27 transitions. Second operand has 17 states, 16 states have (on average 1.75) internal successors, (28), 15 states have internal predecessors, (28), 4 states have call successors, (11), 6 states have call predecessors, (11), 7 states have return successors, (11), 5 states have call predecessors, (11), 4 states have call successors, (11) [2021-11-23 01:57:37,060 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 01:57:37,060 INFO L93 Difference]: Finished difference Result 73 states and 103 transitions. [2021-11-23 01:57:37,061 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-23 01:57:37,062 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 16 states have (on average 1.75) internal successors, (28), 15 states have internal predecessors, (28), 4 states have call successors, (11), 6 states have call predecessors, (11), 7 states have return successors, (11), 5 states have call predecessors, (11), 4 states have call successors, (11) Word has length 25 [2021-11-23 01:57:37,062 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 01:57:37,065 INFO L225 Difference]: With dead ends: 73 [2021-11-23 01:57:37,065 INFO L226 Difference]: Without dead ends: 67 [2021-11-23 01:57:37,066 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 44 SyntacticMatches, 3 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 136 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=130, Invalid=520, Unknown=0, NotChecked=0, Total=650 [2021-11-23 01:57:37,067 INFO L933 BasicCegarLoop]: 30 mSDtfsCounter, 66 mSDsluCounter, 89 mSDsCounter, 0 mSdLazyCounter, 365 mSolverCounterSat, 82 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 70 SdHoareTripleChecker+Valid, 118 SdHoareTripleChecker+Invalid, 447 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 82 IncrementalHoareTripleChecker+Valid, 365 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 01:57:37,068 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [70 Valid, 118 Invalid, 447 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [82 Valid, 365 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-23 01:57:37,071 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2021-11-23 01:57:37,102 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 56. [2021-11-23 01:57:37,105 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 30 states have (on average 1.1666666666666667) internal successors, (35), 33 states have internal predecessors, (35), 14 states have call successors, (14), 6 states have call predecessors, (14), 11 states have return successors, (33), 16 states have call predecessors, (33), 14 states have call successors, (33) [2021-11-23 01:57:37,116 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 82 transitions. [2021-11-23 01:57:37,117 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 82 transitions. Word has length 25 [2021-11-23 01:57:37,117 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 01:57:37,118 INFO L470 AbstractCegarLoop]: Abstraction has 56 states and 82 transitions. [2021-11-23 01:57:37,118 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 16 states have (on average 1.75) internal successors, (28), 15 states have internal predecessors, (28), 4 states have call successors, (11), 6 states have call predecessors, (11), 7 states have return successors, (11), 5 states have call predecessors, (11), 4 states have call successors, (11) [2021-11-23 01:57:37,119 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 82 transitions. [2021-11-23 01:57:37,127 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-11-23 01:57:37,128 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 01:57:37,128 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 01:57:37,151 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87491b03-22ff-477b-a977-7367de4c7410/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-23 01:57:37,335 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87491b03-22ff-477b-a977-7367de4c7410/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2021-11-23 01:57:37,335 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 01:57:37,336 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 01:57:37,336 INFO L85 PathProgramCache]: Analyzing trace with hash 1071008002, now seen corresponding path program 2 times [2021-11-23 01:57:37,336 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 01:57:37,337 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [608087753] [2021-11-23 01:57:37,337 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:57:37,337 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 01:57:37,377 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:57:37,460 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 16 proven. 14 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-23 01:57:37,460 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 01:57:37,461 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [608087753] [2021-11-23 01:57:37,461 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [608087753] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 01:57:37,461 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2146944072] [2021-11-23 01:57:37,461 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 01:57:37,461 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 01:57:37,462 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87491b03-22ff-477b-a977-7367de4c7410/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 01:57:37,463 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87491b03-22ff-477b-a977-7367de4c7410/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 01:57:37,489 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87491b03-22ff-477b-a977-7367de4c7410/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-23 01:57:37,528 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-23 01:57:37,528 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 01:57:37,529 INFO L263 TraceCheckSpWp]: Trace formula consists of 174 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 01:57:37,532 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:57:37,651 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 21 proven. 3 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-23 01:57:37,651 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:57:38,013 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 21 proven. 8 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-23 01:57:38,014 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2146944072] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:57:38,014 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1204133692] [2021-11-23 01:57:38,018 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2021-11-23 01:57:38,018 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 01:57:38,018 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-23 01:57:38,020 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 01:57:38,020 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9, 11] total 16 [2021-11-23 01:57:38,021 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1470239638] [2021-11-23 01:57:38,021 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 01:57:38,021 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 01:57:38,022 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 01:57:38,022 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 01:57:38,023 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=196, Unknown=0, NotChecked=0, Total=240 [2021-11-23 01:57:38,023 INFO L87 Difference]: Start difference. First operand 56 states and 82 transitions. Second operand has 16 states, 14 states have (on average 2.357142857142857) internal successors, (33), 14 states have internal predecessors, (33), 8 states have call successors, (12), 1 states have call predecessors, (12), 7 states have return successors, (15), 8 states have call predecessors, (15), 8 states have call successors, (15) [2021-11-23 01:57:38,309 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 01:57:38,310 INFO L93 Difference]: Finished difference Result 107 states and 168 transitions. [2021-11-23 01:57:38,310 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-23 01:57:38,310 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 14 states have (on average 2.357142857142857) internal successors, (33), 14 states have internal predecessors, (33), 8 states have call successors, (12), 1 states have call predecessors, (12), 7 states have return successors, (15), 8 states have call predecessors, (15), 8 states have call successors, (15) Word has length 35 [2021-11-23 01:57:38,311 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 01:57:38,313 INFO L225 Difference]: With dead ends: 107 [2021-11-23 01:57:38,313 INFO L226 Difference]: Without dead ends: 73 [2021-11-23 01:57:38,315 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 63 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=120, Invalid=432, Unknown=0, NotChecked=0, Total=552 [2021-11-23 01:57:38,316 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 37 mSDsluCounter, 137 mSDsCounter, 0 mSdLazyCounter, 247 mSolverCounterSat, 48 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 150 SdHoareTripleChecker+Invalid, 295 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 48 IncrementalHoareTripleChecker+Valid, 247 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 01:57:38,317 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [40 Valid, 150 Invalid, 295 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [48 Valid, 247 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 01:57:38,318 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2021-11-23 01:57:38,329 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 54. [2021-11-23 01:57:38,330 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 33 states have (on average 1.121212121212121) internal successors, (37), 32 states have internal predecessors, (37), 11 states have call successors, (11), 9 states have call predecessors, (11), 9 states have return successors, (20), 12 states have call predecessors, (20), 11 states have call successors, (20) [2021-11-23 01:57:38,331 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 68 transitions. [2021-11-23 01:57:38,332 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 68 transitions. Word has length 35 [2021-11-23 01:57:38,332 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 01:57:38,332 INFO L470 AbstractCegarLoop]: Abstraction has 54 states and 68 transitions. [2021-11-23 01:57:38,333 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 14 states have (on average 2.357142857142857) internal successors, (33), 14 states have internal predecessors, (33), 8 states have call successors, (12), 1 states have call predecessors, (12), 7 states have return successors, (15), 8 states have call predecessors, (15), 8 states have call successors, (15) [2021-11-23 01:57:38,333 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 68 transitions. [2021-11-23 01:57:38,334 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-11-23 01:57:38,335 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 01:57:38,335 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 01:57:38,363 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87491b03-22ff-477b-a977-7367de4c7410/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-23 01:57:38,555 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87491b03-22ff-477b-a977-7367de4c7410/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 01:57:38,555 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 01:57:38,555 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 01:57:38,556 INFO L85 PathProgramCache]: Analyzing trace with hash -877477481, now seen corresponding path program 1 times [2021-11-23 01:57:38,556 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 01:57:38,556 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [819881683] [2021-11-23 01:57:38,556 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:57:38,556 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 01:57:38,606 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:57:38,687 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 01:57:38,688 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 01:57:38,688 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [819881683] [2021-11-23 01:57:38,688 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [819881683] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 01:57:38,689 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2108903268] [2021-11-23 01:57:38,689 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:57:38,689 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 01:57:38,689 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87491b03-22ff-477b-a977-7367de4c7410/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 01:57:38,691 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87491b03-22ff-477b-a977-7367de4c7410/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 01:57:38,692 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87491b03-22ff-477b-a977-7367de4c7410/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-23 01:57:38,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:57:38,737 INFO L263 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 01:57:38,739 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:57:38,818 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 01:57:38,818 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:57:39,116 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 4 proven. 8 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 01:57:39,116 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2108903268] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:57:39,117 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [111823567] [2021-11-23 01:57:39,122 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2021-11-23 01:57:39,123 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 01:57:39,123 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-23 01:57:39,124 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 01:57:39,124 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 11] total 13 [2021-11-23 01:57:39,125 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2096409681] [2021-11-23 01:57:39,125 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 01:57:39,127 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-23 01:57:39,127 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 01:57:39,130 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-23 01:57:39,131 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2021-11-23 01:57:39,131 INFO L87 Difference]: Start difference. First operand 54 states and 68 transitions. Second operand has 13 states, 12 states have (on average 2.25) internal successors, (27), 12 states have internal predecessors, (27), 7 states have call successors, (7), 1 states have call predecessors, (7), 5 states have return successors, (7), 4 states have call predecessors, (7), 7 states have call successors, (7) [2021-11-23 01:57:39,258 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 01:57:39,258 INFO L93 Difference]: Finished difference Result 61 states and 75 transitions. [2021-11-23 01:57:39,258 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-23 01:57:39,260 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 12 states have (on average 2.25) internal successors, (27), 12 states have internal predecessors, (27), 7 states have call successors, (7), 1 states have call predecessors, (7), 5 states have return successors, (7), 4 states have call predecessors, (7), 7 states have call successors, (7) Word has length 31 [2021-11-23 01:57:39,260 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 01:57:39,266 INFO L225 Difference]: With dead ends: 61 [2021-11-23 01:57:39,271 INFO L226 Difference]: Without dead ends: 49 [2021-11-23 01:57:39,273 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 59 SyntacticMatches, 2 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=63, Invalid=209, Unknown=0, NotChecked=0, Total=272 [2021-11-23 01:57:39,274 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 21 mSDsluCounter, 68 mSDsCounter, 0 mSdLazyCounter, 111 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 77 SdHoareTripleChecker+Invalid, 127 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 111 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 01:57:39,275 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [27 Valid, 77 Invalid, 127 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 111 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 01:57:39,275 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2021-11-23 01:57:39,287 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 47. [2021-11-23 01:57:39,287 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 29 states have (on average 1.103448275862069) internal successors, (32), 28 states have internal predecessors, (32), 10 states have call successors, (10), 8 states have call predecessors, (10), 7 states have return successors, (17), 10 states have call predecessors, (17), 10 states have call successors, (17) [2021-11-23 01:57:39,288 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 59 transitions. [2021-11-23 01:57:39,288 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 59 transitions. Word has length 31 [2021-11-23 01:57:39,289 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 01:57:39,289 INFO L470 AbstractCegarLoop]: Abstraction has 47 states and 59 transitions. [2021-11-23 01:57:39,289 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 12 states have (on average 2.25) internal successors, (27), 12 states have internal predecessors, (27), 7 states have call successors, (7), 1 states have call predecessors, (7), 5 states have return successors, (7), 4 states have call predecessors, (7), 7 states have call successors, (7) [2021-11-23 01:57:39,289 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 59 transitions. [2021-11-23 01:57:39,291 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-11-23 01:57:39,291 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 01:57:39,291 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 4, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 01:57:39,322 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87491b03-22ff-477b-a977-7367de4c7410/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-23 01:57:39,506 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87491b03-22ff-477b-a977-7367de4c7410/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 01:57:39,507 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 01:57:39,507 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 01:57:39,507 INFO L85 PathProgramCache]: Analyzing trace with hash -921128009, now seen corresponding path program 2 times [2021-11-23 01:57:39,507 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 01:57:39,507 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1174988425] [2021-11-23 01:57:39,507 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:57:39,508 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 01:57:39,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:57:39,828 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 13 proven. 37 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2021-11-23 01:57:39,828 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 01:57:39,828 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1174988425] [2021-11-23 01:57:39,829 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1174988425] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 01:57:39,829 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [587380696] [2021-11-23 01:57:39,829 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 01:57:39,829 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 01:57:39,829 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87491b03-22ff-477b-a977-7367de4c7410/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 01:57:39,830 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87491b03-22ff-477b-a977-7367de4c7410/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 01:57:39,846 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87491b03-22ff-477b-a977-7367de4c7410/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-23 01:57:39,908 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2021-11-23 01:57:39,908 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 01:57:39,910 INFO L263 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 47 conjunts are in the unsatisfiable core [2021-11-23 01:57:39,914 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:57:40,249 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 0 proven. 32 refuted. 0 times theorem prover too weak. 62 trivial. 0 not checked. [2021-11-23 01:57:40,249 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:57:41,130 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 0 proven. 80 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-23 01:57:41,130 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [587380696] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:57:41,130 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1000635786] [2021-11-23 01:57:41,133 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2021-11-23 01:57:41,133 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 01:57:41,133 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-23 01:57:41,133 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 01:57:41,133 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 13, 18] total 32 [2021-11-23 01:57:41,133 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1311056311] [2021-11-23 01:57:41,133 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 01:57:41,134 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-23 01:57:41,134 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 01:57:41,136 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-23 01:57:41,136 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=873, Unknown=0, NotChecked=0, Total=992 [2021-11-23 01:57:41,137 INFO L87 Difference]: Start difference. First operand 47 states and 59 transitions. Second operand has 32 states, 27 states have (on average 1.7037037037037037) internal successors, (46), 25 states have internal predecessors, (46), 10 states have call successors, (20), 8 states have call predecessors, (20), 14 states have return successors, (21), 13 states have call predecessors, (21), 10 states have call successors, (21) [2021-11-23 01:57:42,518 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 01:57:42,518 INFO L93 Difference]: Finished difference Result 100 states and 138 transitions. [2021-11-23 01:57:42,519 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-11-23 01:57:42,519 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 27 states have (on average 1.7037037037037037) internal successors, (46), 25 states have internal predecessors, (46), 10 states have call successors, (20), 8 states have call predecessors, (20), 14 states have return successors, (21), 13 states have call predecessors, (21), 10 states have call successors, (21) Word has length 51 [2021-11-23 01:57:42,519 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 01:57:42,521 INFO L225 Difference]: With dead ends: 100 [2021-11-23 01:57:42,522 INFO L226 Difference]: Without dead ends: 96 [2021-11-23 01:57:42,524 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 86 SyntacticMatches, 10 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 822 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=418, Invalid=2552, Unknown=0, NotChecked=0, Total=2970 [2021-11-23 01:57:42,525 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 134 mSDsluCounter, 158 mSDsCounter, 0 mSdLazyCounter, 999 mSolverCounterSat, 256 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 139 SdHoareTripleChecker+Valid, 176 SdHoareTripleChecker+Invalid, 1255 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 256 IncrementalHoareTripleChecker+Valid, 999 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-23 01:57:42,525 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [139 Valid, 176 Invalid, 1255 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [256 Valid, 999 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-23 01:57:42,526 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2021-11-23 01:57:42,548 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 79. [2021-11-23 01:57:42,548 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 44 states have (on average 1.0909090909090908) internal successors, (48), 44 states have internal predecessors, (48), 18 states have call successors, (18), 10 states have call predecessors, (18), 16 states have return successors, (44), 24 states have call predecessors, (44), 18 states have call successors, (44) [2021-11-23 01:57:42,550 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 110 transitions. [2021-11-23 01:57:42,550 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 110 transitions. Word has length 51 [2021-11-23 01:57:42,551 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 01:57:42,551 INFO L470 AbstractCegarLoop]: Abstraction has 79 states and 110 transitions. [2021-11-23 01:57:42,551 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 27 states have (on average 1.7037037037037037) internal successors, (46), 25 states have internal predecessors, (46), 10 states have call successors, (20), 8 states have call predecessors, (20), 14 states have return successors, (21), 13 states have call predecessors, (21), 10 states have call successors, (21) [2021-11-23 01:57:42,551 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 110 transitions. [2021-11-23 01:57:42,554 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-11-23 01:57:42,554 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 01:57:42,557 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 01:57:42,595 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87491b03-22ff-477b-a977-7367de4c7410/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-23 01:57:42,770 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87491b03-22ff-477b-a977-7367de4c7410/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 01:57:42,771 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 01:57:42,771 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 01:57:42,771 INFO L85 PathProgramCache]: Analyzing trace with hash -1011273987, now seen corresponding path program 3 times [2021-11-23 01:57:42,771 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 01:57:42,772 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [886812425] [2021-11-23 01:57:42,772 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:57:42,772 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 01:57:42,798 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:57:42,888 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 17 proven. 37 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2021-11-23 01:57:42,888 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 01:57:42,888 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [886812425] [2021-11-23 01:57:42,889 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [886812425] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 01:57:42,889 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [209401267] [2021-11-23 01:57:42,889 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 01:57:42,889 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 01:57:42,889 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87491b03-22ff-477b-a977-7367de4c7410/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 01:57:42,890 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87491b03-22ff-477b-a977-7367de4c7410/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 01:57:42,918 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87491b03-22ff-477b-a977-7367de4c7410/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-23 01:57:42,966 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 01:57:42,966 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 01:57:42,967 INFO L263 TraceCheckSpWp]: Trace formula consists of 208 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-23 01:57:42,970 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:57:43,082 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 17 proven. 37 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2021-11-23 01:57:43,083 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:57:43,630 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 17 proven. 45 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-11-23 01:57:43,631 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [209401267] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:57:43,632 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1478612934] [2021-11-23 01:57:43,636 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2021-11-23 01:57:43,636 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 01:57:43,636 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-23 01:57:43,638 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 01:57:43,638 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 15] total 17 [2021-11-23 01:57:43,638 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1461079983] [2021-11-23 01:57:43,638 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 01:57:43,639 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-23 01:57:43,640 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 01:57:43,640 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-23 01:57:43,644 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2021-11-23 01:57:43,644 INFO L87 Difference]: Start difference. First operand 79 states and 110 transitions. Second operand has 17 states, 16 states have (on average 2.1875) internal successors, (35), 16 states have internal predecessors, (35), 10 states have call successors, (12), 1 states have call predecessors, (12), 7 states have return successors, (14), 7 states have call predecessors, (14), 10 states have call successors, (14) [2021-11-23 01:57:43,843 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 01:57:43,844 INFO L93 Difference]: Finished difference Result 98 states and 142 transitions. [2021-11-23 01:57:43,844 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-23 01:57:43,844 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 16 states have (on average 2.1875) internal successors, (35), 16 states have internal predecessors, (35), 10 states have call successors, (12), 1 states have call predecessors, (12), 7 states have return successors, (14), 7 states have call predecessors, (14), 10 states have call successors, (14) Word has length 57 [2021-11-23 01:57:43,845 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 01:57:43,846 INFO L225 Difference]: With dead ends: 98 [2021-11-23 01:57:43,846 INFO L226 Difference]: Without dead ends: 80 [2021-11-23 01:57:43,847 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 110 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=109, Invalid=397, Unknown=0, NotChecked=0, Total=506 [2021-11-23 01:57:43,848 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 23 mSDsluCounter, 111 mSDsCounter, 0 mSdLazyCounter, 180 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 119 SdHoareTripleChecker+Invalid, 208 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 180 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 01:57:43,848 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [32 Valid, 119 Invalid, 208 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 180 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 01:57:43,849 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2021-11-23 01:57:43,865 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 71. [2021-11-23 01:57:43,865 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 39 states have (on average 1.0769230769230769) internal successors, (42), 38 states have internal predecessors, (42), 17 states have call successors, (17), 9 states have call predecessors, (17), 14 states have return successors, (42), 23 states have call predecessors, (42), 17 states have call successors, (42) [2021-11-23 01:57:43,867 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 101 transitions. [2021-11-23 01:57:43,867 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 101 transitions. Word has length 57 [2021-11-23 01:57:43,868 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 01:57:43,868 INFO L470 AbstractCegarLoop]: Abstraction has 71 states and 101 transitions. [2021-11-23 01:57:43,868 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 16 states have (on average 2.1875) internal successors, (35), 16 states have internal predecessors, (35), 10 states have call successors, (12), 1 states have call predecessors, (12), 7 states have return successors, (14), 7 states have call predecessors, (14), 10 states have call successors, (14) [2021-11-23 01:57:43,868 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 101 transitions. [2021-11-23 01:57:43,872 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2021-11-23 01:57:43,872 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 01:57:43,872 INFO L514 BasicCegarLoop]: trace histogram [15, 15, 8, 7, 7, 7, 7, 7, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 01:57:43,910 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87491b03-22ff-477b-a977-7367de4c7410/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-23 01:57:44,090 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87491b03-22ff-477b-a977-7367de4c7410/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 01:57:44,091 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 01:57:44,091 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 01:57:44,091 INFO L85 PathProgramCache]: Analyzing trace with hash 1908192695, now seen corresponding path program 4 times [2021-11-23 01:57:44,092 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 01:57:44,092 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [307704789] [2021-11-23 01:57:44,092 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:57:44,092 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 01:57:44,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:57:44,297 INFO L134 CoverageAnalysis]: Checked inductivity of 466 backedges. 48 proven. 125 refuted. 0 times theorem prover too weak. 293 trivial. 0 not checked. [2021-11-23 01:57:44,298 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 01:57:44,298 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [307704789] [2021-11-23 01:57:44,298 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [307704789] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 01:57:44,298 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1610257378] [2021-11-23 01:57:44,298 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 01:57:44,298 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 01:57:44,298 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87491b03-22ff-477b-a977-7367de4c7410/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 01:57:44,303 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87491b03-22ff-477b-a977-7367de4c7410/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 01:57:44,321 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87491b03-22ff-477b-a977-7367de4c7410/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-23 01:57:44,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:57:44,401 INFO L263 TraceCheckSpWp]: Trace formula consists of 433 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-23 01:57:44,414 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:57:44,592 INFO L134 CoverageAnalysis]: Checked inductivity of 466 backedges. 48 proven. 125 refuted. 0 times theorem prover too weak. 293 trivial. 0 not checked. [2021-11-23 01:57:44,592 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:57:45,290 INFO L134 CoverageAnalysis]: Checked inductivity of 466 backedges. 48 proven. 135 refuted. 0 times theorem prover too weak. 283 trivial. 0 not checked. [2021-11-23 01:57:45,290 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1610257378] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:57:45,291 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1065043786] [2021-11-23 01:57:45,293 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2021-11-23 01:57:45,294 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 01:57:45,294 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-23 01:57:45,295 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 01:57:45,295 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 15] total 17 [2021-11-23 01:57:45,296 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [180908357] [2021-11-23 01:57:45,296 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 01:57:45,297 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-23 01:57:45,297 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 01:57:45,297 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-23 01:57:45,298 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=215, Unknown=0, NotChecked=0, Total=272 [2021-11-23 01:57:45,298 INFO L87 Difference]: Start difference. First operand 71 states and 101 transitions. Second operand has 17 states, 16 states have (on average 2.125) internal successors, (34), 16 states have internal predecessors, (34), 11 states have call successors, (13), 1 states have call predecessors, (13), 7 states have return successors, (15), 7 states have call predecessors, (15), 11 states have call successors, (15) [2021-11-23 01:57:45,464 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 01:57:45,464 INFO L93 Difference]: Finished difference Result 80 states and 113 transitions. [2021-11-23 01:57:45,465 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-23 01:57:45,468 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 16 states have (on average 2.125) internal successors, (34), 16 states have internal predecessors, (34), 11 states have call successors, (13), 1 states have call predecessors, (13), 7 states have return successors, (15), 7 states have call predecessors, (15), 11 states have call successors, (15) Word has length 91 [2021-11-23 01:57:45,469 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 01:57:45,471 INFO L225 Difference]: With dead ends: 80 [2021-11-23 01:57:45,472 INFO L226 Difference]: Without dead ends: 63 [2021-11-23 01:57:45,473 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 201 GetRequests, 178 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 73 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=115, Invalid=391, Unknown=0, NotChecked=0, Total=506 [2021-11-23 01:57:45,474 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 29 mSDsluCounter, 85 mSDsCounter, 0 mSdLazyCounter, 162 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 97 SdHoareTripleChecker+Invalid, 185 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 162 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 01:57:45,475 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [34 Valid, 97 Invalid, 185 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 162 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 01:57:45,477 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2021-11-23 01:57:45,501 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 56. [2021-11-23 01:57:45,501 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 31 states have (on average 1.064516129032258) internal successors, (33), 31 states have internal predecessors, (33), 14 states have call successors, (14), 7 states have call predecessors, (14), 10 states have return successors, (32), 17 states have call predecessors, (32), 14 states have call successors, (32) [2021-11-23 01:57:45,503 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 79 transitions. [2021-11-23 01:57:45,503 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 79 transitions. Word has length 91 [2021-11-23 01:57:45,507 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 01:57:45,507 INFO L470 AbstractCegarLoop]: Abstraction has 56 states and 79 transitions. [2021-11-23 01:57:45,508 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 16 states have (on average 2.125) internal successors, (34), 16 states have internal predecessors, (34), 11 states have call successors, (13), 1 states have call predecessors, (13), 7 states have return successors, (15), 7 states have call predecessors, (15), 11 states have call successors, (15) [2021-11-23 01:57:45,508 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 79 transitions. [2021-11-23 01:57:45,514 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2021-11-23 01:57:45,519 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 01:57:45,519 INFO L514 BasicCegarLoop]: trace histogram [15, 15, 8, 7, 7, 7, 7, 7, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 01:57:45,552 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87491b03-22ff-477b-a977-7367de4c7410/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-23 01:57:45,734 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87491b03-22ff-477b-a977-7367de4c7410/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-11-23 01:57:45,735 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 01:57:45,735 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 01:57:45,735 INFO L85 PathProgramCache]: Analyzing trace with hash 768848125, now seen corresponding path program 5 times [2021-11-23 01:57:45,735 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 01:57:45,735 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1993714122] [2021-11-23 01:57:45,735 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:57:45,735 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 01:57:45,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:57:46,250 INFO L134 CoverageAnalysis]: Checked inductivity of 476 backedges. 34 proven. 161 refuted. 0 times theorem prover too weak. 281 trivial. 0 not checked. [2021-11-23 01:57:46,250 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 01:57:46,250 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1993714122] [2021-11-23 01:57:46,250 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1993714122] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 01:57:46,251 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [523967580] [2021-11-23 01:57:46,251 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 01:57:46,251 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 01:57:46,251 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87491b03-22ff-477b-a977-7367de4c7410/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 01:57:46,255 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87491b03-22ff-477b-a977-7367de4c7410/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 01:57:46,276 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87491b03-22ff-477b-a977-7367de4c7410/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-23 01:57:46,371 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2021-11-23 01:57:46,372 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 01:57:46,376 INFO L263 TraceCheckSpWp]: Trace formula consists of 447 conjuncts, 91 conjunts are in the unsatisfiable core [2021-11-23 01:57:46,380 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:57:46,898 INFO L134 CoverageAnalysis]: Checked inductivity of 476 backedges. 0 proven. 161 refuted. 0 times theorem prover too weak. 315 trivial. 0 not checked. [2021-11-23 01:57:46,898 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:57:48,825 INFO L134 CoverageAnalysis]: Checked inductivity of 476 backedges. 0 proven. 441 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2021-11-23 01:57:48,825 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [523967580] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:57:48,825 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1054671582] [2021-11-23 01:57:48,828 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2021-11-23 01:57:48,828 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 01:57:48,828 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-23 01:57:48,829 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 01:57:48,829 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 17, 32] total 51 [2021-11-23 01:57:48,829 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1609884172] [2021-11-23 01:57:48,829 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 01:57:48,830 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2021-11-23 01:57:48,830 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 01:57:48,831 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2021-11-23 01:57:48,833 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=185, Invalid=2365, Unknown=0, NotChecked=0, Total=2550 [2021-11-23 01:57:48,833 INFO L87 Difference]: Start difference. First operand 56 states and 79 transitions. Second operand has 51 states, 42 states have (on average 1.619047619047619) internal successors, (68), 38 states have internal predecessors, (68), 16 states have call successors, (27), 12 states have call predecessors, (27), 24 states have return successors, (33), 24 states have call predecessors, (33), 16 states have call successors, (33) [2021-11-23 01:57:55,069 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 01:57:55,069 INFO L93 Difference]: Finished difference Result 203 states and 324 transitions. [2021-11-23 01:57:55,070 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 78 states. [2021-11-23 01:57:55,070 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 42 states have (on average 1.619047619047619) internal successors, (68), 38 states have internal predecessors, (68), 16 states have call successors, (27), 12 states have call predecessors, (27), 24 states have return successors, (33), 24 states have call predecessors, (33), 16 states have call successors, (33) Word has length 97 [2021-11-23 01:57:55,071 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 01:57:55,073 INFO L225 Difference]: With dead ends: 203 [2021-11-23 01:57:55,073 INFO L226 Difference]: Without dead ends: 199 [2021-11-23 01:57:55,079 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 305 GetRequests, 177 SyntacticMatches, 14 SemanticMatches, 114 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3559 ImplicationChecksByTransitivity, 5.0s TimeCoverageRelationStatistics Valid=1764, Invalid=11576, Unknown=0, NotChecked=0, Total=13340 [2021-11-23 01:57:55,079 INFO L933 BasicCegarLoop]: 25 mSDtfsCounter, 480 mSDsluCounter, 294 mSDsCounter, 0 mSdLazyCounter, 3402 mSolverCounterSat, 1400 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 486 SdHoareTripleChecker+Valid, 314 SdHoareTripleChecker+Invalid, 4802 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1400 IncrementalHoareTripleChecker+Valid, 3402 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.1s IncrementalHoareTripleChecker+Time [2021-11-23 01:57:55,080 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [486 Valid, 314 Invalid, 4802 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1400 Valid, 3402 Invalid, 0 Unknown, 0 Unchecked, 2.1s Time] [2021-11-23 01:57:55,081 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 199 states. [2021-11-23 01:57:55,120 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 199 to 156. [2021-11-23 01:57:55,121 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 156 states, 84 states have (on average 1.0833333333333333) internal successors, (91), 81 states have internal predecessors, (91), 37 states have call successors, (37), 20 states have call predecessors, (37), 34 states have return successors, (107), 54 states have call predecessors, (107), 37 states have call successors, (107) [2021-11-23 01:57:55,128 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 156 states to 156 states and 235 transitions. [2021-11-23 01:57:55,129 INFO L78 Accepts]: Start accepts. Automaton has 156 states and 235 transitions. Word has length 97 [2021-11-23 01:57:55,129 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 01:57:55,129 INFO L470 AbstractCegarLoop]: Abstraction has 156 states and 235 transitions. [2021-11-23 01:57:55,130 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 42 states have (on average 1.619047619047619) internal successors, (68), 38 states have internal predecessors, (68), 16 states have call successors, (27), 12 states have call predecessors, (27), 24 states have return successors, (33), 24 states have call predecessors, (33), 16 states have call successors, (33) [2021-11-23 01:57:55,130 INFO L276 IsEmpty]: Start isEmpty. Operand 156 states and 235 transitions. [2021-11-23 01:57:55,134 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2021-11-23 01:57:55,134 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 01:57:55,135 INFO L514 BasicCegarLoop]: trace histogram [15, 15, 8, 7, 7, 7, 7, 7, 4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 01:57:55,172 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87491b03-22ff-477b-a977-7367de4c7410/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-23 01:57:55,362 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87491b03-22ff-477b-a977-7367de4c7410/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 01:57:55,363 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 01:57:55,363 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 01:57:55,363 INFO L85 PathProgramCache]: Analyzing trace with hash 489586039, now seen corresponding path program 6 times [2021-11-23 01:57:55,363 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 01:57:55,363 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1458565677] [2021-11-23 01:57:55,364 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:57:55,364 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 01:57:55,401 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:57:55,534 INFO L134 CoverageAnalysis]: Checked inductivity of 492 backedges. 48 proven. 138 refuted. 0 times theorem prover too weak. 306 trivial. 0 not checked. [2021-11-23 01:57:55,534 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 01:57:55,534 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1458565677] [2021-11-23 01:57:55,534 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1458565677] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 01:57:55,535 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1512279898] [2021-11-23 01:57:55,535 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 01:57:55,535 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 01:57:55,535 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87491b03-22ff-477b-a977-7367de4c7410/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 01:57:55,536 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87491b03-22ff-477b-a977-7367de4c7410/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 01:57:55,560 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87491b03-22ff-477b-a977-7367de4c7410/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-23 01:57:55,636 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 01:57:55,636 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 01:57:55,638 INFO L263 TraceCheckSpWp]: Trace formula consists of 414 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-23 01:57:55,664 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:57:55,820 INFO L134 CoverageAnalysis]: Checked inductivity of 492 backedges. 48 proven. 138 refuted. 0 times theorem prover too weak. 306 trivial. 0 not checked. [2021-11-23 01:57:55,821 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:57:56,737 INFO L134 CoverageAnalysis]: Checked inductivity of 492 backedges. 48 proven. 156 refuted. 0 times theorem prover too weak. 288 trivial. 0 not checked. [2021-11-23 01:57:56,738 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1512279898] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:57:56,738 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1469542472] [2021-11-23 01:57:56,740 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2021-11-23 01:57:56,740 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 01:57:56,740 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-23 01:57:56,741 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 01:57:56,742 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 19] total 21 [2021-11-23 01:57:56,742 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1878630431] [2021-11-23 01:57:56,742 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 01:57:56,743 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2021-11-23 01:57:56,743 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 01:57:56,743 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-11-23 01:57:56,744 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2021-11-23 01:57:56,744 INFO L87 Difference]: Start difference. First operand 156 states and 235 transitions. Second operand has 21 states, 20 states have (on average 2.1) internal successors, (42), 20 states have internal predecessors, (42), 13 states have call successors, (15), 1 states have call predecessors, (15), 9 states have return successors, (19), 9 states have call predecessors, (19), 13 states have call successors, (19) [2021-11-23 01:57:57,002 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 01:57:57,003 INFO L93 Difference]: Finished difference Result 205 states and 381 transitions. [2021-11-23 01:57:57,003 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-23 01:57:57,003 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 20 states have (on average 2.1) internal successors, (42), 20 states have internal predecessors, (42), 13 states have call successors, (15), 1 states have call predecessors, (15), 9 states have return successors, (19), 9 states have call predecessors, (19), 13 states have call successors, (19) Word has length 103 [2021-11-23 01:57:57,004 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 01:57:57,006 INFO L225 Difference]: With dead ends: 205 [2021-11-23 01:57:57,007 INFO L226 Difference]: Without dead ends: 184 [2021-11-23 01:57:57,008 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 231 GetRequests, 202 SyntacticMatches, 2 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 128 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2021-11-23 01:57:57,008 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 33 mSDsluCounter, 137 mSDsCounter, 0 mSdLazyCounter, 241 mSolverCounterSat, 61 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 43 SdHoareTripleChecker+Valid, 145 SdHoareTripleChecker+Invalid, 302 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 61 IncrementalHoareTripleChecker+Valid, 241 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 01:57:57,009 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [43 Valid, 145 Invalid, 302 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [61 Valid, 241 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 01:57:57,009 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 184 states. [2021-11-23 01:57:57,061 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 184 to 150. [2021-11-23 01:57:57,062 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 150 states, 79 states have (on average 1.0759493670886076) internal successors, (85), 75 states have internal predecessors, (85), 37 states have call successors, (37), 19 states have call predecessors, (37), 33 states have return successors, (125), 55 states have call predecessors, (125), 37 states have call successors, (125) [2021-11-23 01:57:57,064 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 247 transitions. [2021-11-23 01:57:57,065 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 247 transitions. Word has length 103 [2021-11-23 01:57:57,066 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 01:57:57,066 INFO L470 AbstractCegarLoop]: Abstraction has 150 states and 247 transitions. [2021-11-23 01:57:57,066 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 20 states have (on average 2.1) internal successors, (42), 20 states have internal predecessors, (42), 13 states have call successors, (15), 1 states have call predecessors, (15), 9 states have return successors, (19), 9 states have call predecessors, (19), 13 states have call successors, (19) [2021-11-23 01:57:57,067 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 247 transitions. [2021-11-23 01:57:57,071 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2021-11-23 01:57:57,071 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 01:57:57,072 INFO L514 BasicCegarLoop]: trace histogram [19, 19, 10, 9, 9, 9, 9, 9, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 01:57:57,110 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87491b03-22ff-477b-a977-7367de4c7410/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-23 01:57:57,286 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87491b03-22ff-477b-a977-7367de4c7410/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 01:57:57,287 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 01:57:57,287 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 01:57:57,287 INFO L85 PathProgramCache]: Analyzing trace with hash -479723811, now seen corresponding path program 7 times [2021-11-23 01:57:57,287 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 01:57:57,288 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [465530810] [2021-11-23 01:57:57,288 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:57:57,288 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 01:57:57,316 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:57:57,411 INFO L134 CoverageAnalysis]: Checked inductivity of 770 backedges. 103 proven. 231 refuted. 0 times theorem prover too weak. 436 trivial. 0 not checked. [2021-11-23 01:57:57,411 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 01:57:57,411 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [465530810] [2021-11-23 01:57:57,411 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [465530810] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 01:57:57,412 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2038710827] [2021-11-23 01:57:57,412 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 01:57:57,412 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 01:57:57,412 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87491b03-22ff-477b-a977-7367de4c7410/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 01:57:57,413 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87491b03-22ff-477b-a977-7367de4c7410/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 01:57:57,433 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87491b03-22ff-477b-a977-7367de4c7410/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-23 01:57:57,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:57:57,531 INFO L263 TraceCheckSpWp]: Trace formula consists of 545 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-23 01:57:57,535 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:57:57,696 INFO L134 CoverageAnalysis]: Checked inductivity of 770 backedges. 430 proven. 88 refuted. 0 times theorem prover too weak. 252 trivial. 0 not checked. [2021-11-23 01:57:57,696 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:57:58,502 INFO L134 CoverageAnalysis]: Checked inductivity of 770 backedges. 103 proven. 236 refuted. 0 times theorem prover too weak. 431 trivial. 0 not checked. [2021-11-23 01:57:58,502 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2038710827] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:57:58,503 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [748105105] [2021-11-23 01:57:58,505 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2021-11-23 01:57:58,505 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 01:57:58,505 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-23 01:57:58,505 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 01:57:58,506 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 13] total 15 [2021-11-23 01:57:58,506 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [620460307] [2021-11-23 01:57:58,506 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 01:57:58,506 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-23 01:57:58,506 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 01:57:58,507 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-23 01:57:58,507 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2021-11-23 01:57:58,507 INFO L87 Difference]: Start difference. First operand 150 states and 247 transitions. Second operand has 15 states, 14 states have (on average 3.142857142857143) internal successors, (44), 14 states have internal predecessors, (44), 11 states have call successors, (19), 2 states have call predecessors, (19), 7 states have return successors, (22), 6 states have call predecessors, (22), 11 states have call successors, (22) [2021-11-23 01:57:58,728 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 01:57:58,728 INFO L93 Difference]: Finished difference Result 299 states and 584 transitions. [2021-11-23 01:57:58,729 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-23 01:57:58,729 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 3.142857142857143) internal successors, (44), 14 states have internal predecessors, (44), 11 states have call successors, (19), 2 states have call predecessors, (19), 7 states have return successors, (22), 6 states have call predecessors, (22), 11 states have call successors, (22) Word has length 117 [2021-11-23 01:57:58,729 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 01:57:58,733 INFO L225 Difference]: With dead ends: 299 [2021-11-23 01:57:58,733 INFO L226 Difference]: Without dead ends: 193 [2021-11-23 01:57:58,735 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 254 GetRequests, 230 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 65 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=159, Invalid=393, Unknown=0, NotChecked=0, Total=552 [2021-11-23 01:57:58,735 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 40 mSDsluCounter, 104 mSDsCounter, 0 mSdLazyCounter, 102 mSolverCounterSat, 112 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 119 SdHoareTripleChecker+Invalid, 214 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 112 IncrementalHoareTripleChecker+Valid, 102 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 01:57:58,736 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [40 Valid, 119 Invalid, 214 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [112 Valid, 102 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 01:57:58,737 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 193 states. [2021-11-23 01:57:58,777 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 193 to 166. [2021-11-23 01:57:58,777 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 166 states, 87 states have (on average 1.0689655172413792) internal successors, (93), 85 states have internal predecessors, (93), 45 states have call successors, (45), 23 states have call predecessors, (45), 33 states have return successors, (121), 57 states have call predecessors, (121), 45 states have call successors, (121) [2021-11-23 01:57:58,779 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 166 states to 166 states and 259 transitions. [2021-11-23 01:57:58,780 INFO L78 Accepts]: Start accepts. Automaton has 166 states and 259 transitions. Word has length 117 [2021-11-23 01:57:58,781 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 01:57:58,781 INFO L470 AbstractCegarLoop]: Abstraction has 166 states and 259 transitions. [2021-11-23 01:57:58,781 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 14 states have (on average 3.142857142857143) internal successors, (44), 14 states have internal predecessors, (44), 11 states have call successors, (19), 2 states have call predecessors, (19), 7 states have return successors, (22), 6 states have call predecessors, (22), 11 states have call successors, (22) [2021-11-23 01:57:58,782 INFO L276 IsEmpty]: Start isEmpty. Operand 166 states and 259 transitions. [2021-11-23 01:57:58,785 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2021-11-23 01:57:58,785 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 01:57:58,785 INFO L514 BasicCegarLoop]: trace histogram [19, 19, 10, 9, 9, 9, 9, 9, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 01:57:58,819 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87491b03-22ff-477b-a977-7367de4c7410/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-23 01:57:58,998 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87491b03-22ff-477b-a977-7367de4c7410/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 01:57:58,999 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 01:57:58,999 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 01:57:58,999 INFO L85 PathProgramCache]: Analyzing trace with hash 480006941, now seen corresponding path program 8 times [2021-11-23 01:57:58,999 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 01:57:58,999 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1132549705] [2021-11-23 01:57:58,999 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:57:58,999 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 01:57:59,033 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:57:59,126 INFO L134 CoverageAnalysis]: Checked inductivity of 770 backedges. 121 proven. 213 refuted. 0 times theorem prover too weak. 436 trivial. 0 not checked. [2021-11-23 01:57:59,126 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 01:57:59,126 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1132549705] [2021-11-23 01:57:59,127 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1132549705] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 01:57:59,127 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [396837807] [2021-11-23 01:57:59,127 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 01:57:59,127 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 01:57:59,127 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87491b03-22ff-477b-a977-7367de4c7410/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 01:57:59,128 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87491b03-22ff-477b-a977-7367de4c7410/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 01:57:59,151 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87491b03-22ff-477b-a977-7367de4c7410/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-23 01:57:59,254 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2021-11-23 01:57:59,254 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 01:57:59,256 INFO L263 TraceCheckSpWp]: Trace formula consists of 446 conjuncts, 31 conjunts are in the unsatisfiable core [2021-11-23 01:57:59,258 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:57:59,539 INFO L134 CoverageAnalysis]: Checked inductivity of 770 backedges. 63 proven. 185 refuted. 0 times theorem prover too weak. 522 trivial. 0 not checked. [2021-11-23 01:57:59,539 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:58:00,238 INFO L134 CoverageAnalysis]: Checked inductivity of 770 backedges. 63 proven. 198 refuted. 0 times theorem prover too weak. 509 trivial. 0 not checked. [2021-11-23 01:58:00,238 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [396837807] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:58:00,239 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [496052607] [2021-11-23 01:58:00,242 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2021-11-23 01:58:00,242 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 01:58:00,243 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-23 01:58:00,244 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 01:58:00,244 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 12, 17] total 27 [2021-11-23 01:58:00,244 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1857004186] [2021-11-23 01:58:00,244 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 01:58:00,246 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-11-23 01:58:00,246 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 01:58:00,247 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-11-23 01:58:00,247 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=615, Unknown=0, NotChecked=0, Total=702 [2021-11-23 01:58:00,248 INFO L87 Difference]: Start difference. First operand 166 states and 259 transitions. Second operand has 27 states, 25 states have (on average 2.2) internal successors, (55), 25 states have internal predecessors, (55), 20 states have call successors, (25), 1 states have call predecessors, (25), 14 states have return successors, (32), 13 states have call predecessors, (32), 20 states have call successors, (32) [2021-11-23 01:58:00,950 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 01:58:00,950 INFO L93 Difference]: Finished difference Result 297 states and 548 transitions. [2021-11-23 01:58:00,951 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-23 01:58:00,951 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 25 states have (on average 2.2) internal successors, (55), 25 states have internal predecessors, (55), 20 states have call successors, (25), 1 states have call predecessors, (25), 14 states have return successors, (32), 13 states have call predecessors, (32), 20 states have call successors, (32) Word has length 117 [2021-11-23 01:58:00,951 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 01:58:00,954 INFO L225 Difference]: With dead ends: 297 [2021-11-23 01:58:00,954 INFO L226 Difference]: Without dead ends: 179 [2021-11-23 01:58:00,956 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 263 GetRequests, 220 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 295 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=343, Invalid=1637, Unknown=0, NotChecked=0, Total=1980 [2021-11-23 01:58:00,957 INFO L933 BasicCegarLoop]: 27 mSDtfsCounter, 52 mSDsluCounter, 293 mSDsCounter, 0 mSdLazyCounter, 777 mSolverCounterSat, 134 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 57 SdHoareTripleChecker+Valid, 299 SdHoareTripleChecker+Invalid, 911 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 134 IncrementalHoareTripleChecker+Valid, 777 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 01:58:00,957 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [57 Valid, 299 Invalid, 911 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [134 Valid, 777 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 01:58:00,958 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 179 states. [2021-11-23 01:58:00,974 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 179 to 155. [2021-11-23 01:58:00,975 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 155 states, 82 states have (on average 1.0609756097560976) internal successors, (87), 81 states have internal predecessors, (87), 44 states have call successors, (44), 23 states have call predecessors, (44), 28 states have return successors, (99), 50 states have call predecessors, (99), 44 states have call successors, (99) [2021-11-23 01:58:00,977 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 155 states to 155 states and 230 transitions. [2021-11-23 01:58:00,977 INFO L78 Accepts]: Start accepts. Automaton has 155 states and 230 transitions. Word has length 117 [2021-11-23 01:58:00,978 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 01:58:00,978 INFO L470 AbstractCegarLoop]: Abstraction has 155 states and 230 transitions. [2021-11-23 01:58:00,978 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 25 states have (on average 2.2) internal successors, (55), 25 states have internal predecessors, (55), 20 states have call successors, (25), 1 states have call predecessors, (25), 14 states have return successors, (32), 13 states have call predecessors, (32), 20 states have call successors, (32) [2021-11-23 01:58:00,978 INFO L276 IsEmpty]: Start isEmpty. Operand 155 states and 230 transitions. [2021-11-23 01:58:00,981 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 184 [2021-11-23 01:58:00,982 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 01:58:00,982 INFO L514 BasicCegarLoop]: trace histogram [31, 31, 16, 15, 15, 15, 15, 15, 4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 01:58:01,022 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87491b03-22ff-477b-a977-7367de4c7410/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-23 01:58:01,206 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87491b03-22ff-477b-a977-7367de4c7410/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-11-23 01:58:01,207 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 01:58:01,207 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 01:58:01,207 INFO L85 PathProgramCache]: Analyzing trace with hash 1718503799, now seen corresponding path program 9 times [2021-11-23 01:58:01,207 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 01:58:01,207 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2074290530] [2021-11-23 01:58:01,207 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:58:01,208 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 01:58:01,246 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:58:01,826 INFO L134 CoverageAnalysis]: Checked inductivity of 2100 backedges. 74 proven. 705 refuted. 0 times theorem prover too weak. 1321 trivial. 0 not checked. [2021-11-23 01:58:01,826 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 01:58:01,827 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2074290530] [2021-11-23 01:58:01,827 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2074290530] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 01:58:01,827 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [893077423] [2021-11-23 01:58:01,827 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 01:58:01,827 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 01:58:01,827 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87491b03-22ff-477b-a977-7367de4c7410/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 01:58:01,828 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87491b03-22ff-477b-a977-7367de4c7410/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 01:58:01,846 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87491b03-22ff-477b-a977-7367de4c7410/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-23 01:58:01,998 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 01:58:01,998 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 01:58:02,005 INFO L263 TraceCheckSpWp]: Trace formula consists of 853 conjuncts, 175 conjunts are in the unsatisfiable core [2021-11-23 01:58:02,012 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:58:02,898 INFO L134 CoverageAnalysis]: Checked inductivity of 2100 backedges. 0 proven. 705 refuted. 0 times theorem prover too weak. 1395 trivial. 0 not checked. [2021-11-23 01:58:02,898 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:58:07,152 INFO L134 CoverageAnalysis]: Checked inductivity of 2100 backedges. 0 proven. 2025 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2021-11-23 01:58:07,152 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [893077423] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:58:07,152 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1714458996] [2021-11-23 01:58:07,154 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2021-11-23 01:58:07,154 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 01:58:07,154 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-23 01:58:07,159 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 01:58:07,160 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 21, 58] total 83 [2021-11-23 01:58:07,160 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1250899376] [2021-11-23 01:58:07,160 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 01:58:07,164 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 83 states [2021-11-23 01:58:07,164 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 01:58:07,165 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 83 interpolants. [2021-11-23 01:58:07,167 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=301, Invalid=6505, Unknown=0, NotChecked=0, Total=6806 [2021-11-23 01:58:07,168 INFO L87 Difference]: Start difference. First operand 155 states and 230 transitions. Second operand has 83 states, 65 states have (on average 1.646153846153846) internal successors, (107), 62 states have internal predecessors, (107), 29 states have call successors, (44), 20 states have call predecessors, (44), 40 states have return successors, (54), 41 states have call predecessors, (54), 29 states have call successors, (54) [2021-11-23 01:58:35,386 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 01:58:35,386 INFO L93 Difference]: Finished difference Result 521 states and 871 transitions. [2021-11-23 01:58:35,386 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 176 states. [2021-11-23 01:58:35,387 INFO L78 Accepts]: Start accepts. Automaton has has 83 states, 65 states have (on average 1.646153846153846) internal successors, (107), 62 states have internal predecessors, (107), 29 states have call successors, (44), 20 states have call predecessors, (44), 40 states have return successors, (54), 41 states have call predecessors, (54), 29 states have call successors, (54) Word has length 183 [2021-11-23 01:58:35,387 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 01:58:35,393 INFO L225 Difference]: With dead ends: 521 [2021-11-23 01:58:35,394 INFO L226 Difference]: Without dead ends: 517 [2021-11-23 01:58:35,405 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 615 GetRequests, 350 SyntacticMatches, 23 SemanticMatches, 242 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17502 ImplicationChecksByTransitivity, 23.7s TimeCoverageRelationStatistics Valid=8051, Invalid=51241, Unknown=0, NotChecked=0, Total=59292 [2021-11-23 01:58:35,406 INFO L933 BasicCegarLoop]: 49 mSDtfsCounter, 1644 mSDsluCounter, 959 mSDsCounter, 0 mSdLazyCounter, 10965 mSolverCounterSat, 6153 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1651 SdHoareTripleChecker+Valid, 1001 SdHoareTripleChecker+Invalid, 17118 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6153 IncrementalHoareTripleChecker+Valid, 10965 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.5s IncrementalHoareTripleChecker+Time [2021-11-23 01:58:35,406 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1651 Valid, 1001 Invalid, 17118 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6153 Valid, 10965 Invalid, 0 Unknown, 0 Unchecked, 6.5s Time] [2021-11-23 01:58:35,407 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 517 states. [2021-11-23 01:58:35,463 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 517 to 432. [2021-11-23 01:58:35,464 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 432 states, 232 states have (on average 1.0603448275862069) internal successors, (246), 224 states have internal predecessors, (246), 121 states have call successors, (121), 71 states have call predecessors, (121), 78 states have return successors, (299), 136 states have call predecessors, (299), 121 states have call successors, (299) [2021-11-23 01:58:35,469 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 432 states to 432 states and 666 transitions. [2021-11-23 01:58:35,469 INFO L78 Accepts]: Start accepts. Automaton has 432 states and 666 transitions. Word has length 183 [2021-11-23 01:58:35,470 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 01:58:35,470 INFO L470 AbstractCegarLoop]: Abstraction has 432 states and 666 transitions. [2021-11-23 01:58:35,471 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 83 states, 65 states have (on average 1.646153846153846) internal successors, (107), 62 states have internal predecessors, (107), 29 states have call successors, (44), 20 states have call predecessors, (44), 40 states have return successors, (54), 41 states have call predecessors, (54), 29 states have call successors, (54) [2021-11-23 01:58:35,471 INFO L276 IsEmpty]: Start isEmpty. Operand 432 states and 666 transitions. [2021-11-23 01:58:35,477 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 190 [2021-11-23 01:58:35,477 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 01:58:35,477 INFO L514 BasicCegarLoop]: trace histogram [31, 31, 16, 15, 15, 15, 15, 15, 5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 01:58:35,511 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87491b03-22ff-477b-a977-7367de4c7410/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-23 01:58:35,698 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87491b03-22ff-477b-a977-7367de4c7410/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-11-23 01:58:35,699 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 01:58:35,699 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 01:58:35,699 INFO L85 PathProgramCache]: Analyzing trace with hash -1881135043, now seen corresponding path program 10 times [2021-11-23 01:58:35,699 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 01:58:35,699 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [258818906] [2021-11-23 01:58:35,699 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:58:35,700 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 01:58:35,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:58:35,926 INFO L134 CoverageAnalysis]: Checked inductivity of 2122 backedges. 115 proven. 415 refuted. 0 times theorem prover too weak. 1592 trivial. 0 not checked. [2021-11-23 01:58:35,926 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 01:58:35,926 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [258818906] [2021-11-23 01:58:35,926 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [258818906] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 01:58:35,926 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [864882174] [2021-11-23 01:58:35,927 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 01:58:35,927 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 01:58:35,927 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87491b03-22ff-477b-a977-7367de4c7410/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 01:58:35,928 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87491b03-22ff-477b-a977-7367de4c7410/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 01:58:35,946 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87491b03-22ff-477b-a977-7367de4c7410/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-23 01:58:36,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:58:36,110 INFO L263 TraceCheckSpWp]: Trace formula consists of 867 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-23 01:58:36,114 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:58:36,348 INFO L134 CoverageAnalysis]: Checked inductivity of 2122 backedges. 115 proven. 415 refuted. 0 times theorem prover too weak. 1592 trivial. 0 not checked. [2021-11-23 01:58:36,349 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:58:37,869 INFO L134 CoverageAnalysis]: Checked inductivity of 2122 backedges. 115 proven. 447 refuted. 0 times theorem prover too weak. 1560 trivial. 0 not checked. [2021-11-23 01:58:37,870 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [864882174] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:58:37,870 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [353047645] [2021-11-23 01:58:37,875 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2021-11-23 01:58:37,876 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 01:58:37,877 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-23 01:58:37,878 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 01:58:37,878 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 23] total 25 [2021-11-23 01:58:37,879 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1268543448] [2021-11-23 01:58:37,879 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 01:58:37,879 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-11-23 01:58:37,880 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 01:58:37,880 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-11-23 01:58:37,880 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=493, Unknown=0, NotChecked=0, Total=600 [2021-11-23 01:58:37,881 INFO L87 Difference]: Start difference. First operand 432 states and 666 transitions. Second operand has 25 states, 24 states have (on average 2.0416666666666665) internal successors, (49), 24 states have internal predecessors, (49), 16 states have call successors, (18), 1 states have call predecessors, (18), 11 states have return successors, (24), 11 states have call predecessors, (24), 16 states have call successors, (24) [2021-11-23 01:58:38,189 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 01:58:38,189 INFO L93 Difference]: Finished difference Result 519 states and 954 transitions. [2021-11-23 01:58:38,189 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-23 01:58:38,189 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 24 states have (on average 2.0416666666666665) internal successors, (49), 24 states have internal predecessors, (49), 16 states have call successors, (18), 1 states have call predecessors, (18), 11 states have return successors, (24), 11 states have call predecessors, (24), 16 states have call successors, (24) Word has length 189 [2021-11-23 01:58:38,190 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 01:58:38,197 INFO L225 Difference]: With dead ends: 519 [2021-11-23 01:58:38,197 INFO L226 Difference]: Without dead ends: 495 [2021-11-23 01:58:38,198 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 409 GetRequests, 374 SyntacticMatches, 2 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 208 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=237, Invalid=953, Unknown=0, NotChecked=0, Total=1190 [2021-11-23 01:58:38,199 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 49 mSDsluCounter, 150 mSDsCounter, 0 mSdLazyCounter, 235 mSolverCounterSat, 87 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 60 SdHoareTripleChecker+Valid, 161 SdHoareTripleChecker+Invalid, 322 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 87 IncrementalHoareTripleChecker+Valid, 235 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 01:58:38,199 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [60 Valid, 161 Invalid, 322 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [87 Valid, 235 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 01:58:38,200 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 495 states. [2021-11-23 01:58:38,264 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 495 to 423. [2021-11-23 01:58:38,266 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 423 states, 225 states have (on average 1.0577777777777777) internal successors, (238), 216 states have internal predecessors, (238), 121 states have call successors, (121), 70 states have call predecessors, (121), 76 states have return successors, (328), 136 states have call predecessors, (328), 121 states have call successors, (328) [2021-11-23 01:58:38,270 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 423 states to 423 states and 687 transitions. [2021-11-23 01:58:38,270 INFO L78 Accepts]: Start accepts. Automaton has 423 states and 687 transitions. Word has length 189 [2021-11-23 01:58:38,271 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 01:58:38,271 INFO L470 AbstractCegarLoop]: Abstraction has 423 states and 687 transitions. [2021-11-23 01:58:38,271 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 24 states have (on average 2.0416666666666665) internal successors, (49), 24 states have internal predecessors, (49), 16 states have call successors, (18), 1 states have call predecessors, (18), 11 states have return successors, (24), 11 states have call predecessors, (24), 16 states have call successors, (24) [2021-11-23 01:58:38,271 INFO L276 IsEmpty]: Start isEmpty. Operand 423 states and 687 transitions. [2021-11-23 01:58:38,277 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 224 [2021-11-23 01:58:38,278 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 01:58:38,278 INFO L514 BasicCegarLoop]: trace histogram [39, 39, 20, 19, 19, 19, 19, 19, 4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 01:58:38,315 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87491b03-22ff-477b-a977-7367de4c7410/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-23 01:58:38,490 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87491b03-22ff-477b-a977-7367de4c7410/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 01:58:38,491 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 01:58:38,491 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 01:58:38,491 INFO L85 PathProgramCache]: Analyzing trace with hash 607584119, now seen corresponding path program 11 times [2021-11-23 01:58:38,491 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 01:58:38,491 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1507866439] [2021-11-23 01:58:38,491 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:58:38,492 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 01:58:38,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:58:38,640 INFO L134 CoverageAnalysis]: Checked inductivity of 3336 backedges. 266 proven. 761 refuted. 0 times theorem prover too weak. 2309 trivial. 0 not checked. [2021-11-23 01:58:38,640 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 01:58:38,640 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1507866439] [2021-11-23 01:58:38,641 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1507866439] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 01:58:38,641 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2143544246] [2021-11-23 01:58:38,641 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 01:58:38,641 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 01:58:38,641 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87491b03-22ff-477b-a977-7367de4c7410/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 01:58:38,642 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87491b03-22ff-477b-a977-7367de4c7410/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 01:58:38,669 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87491b03-22ff-477b-a977-7367de4c7410/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-23 01:58:38,928 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 32 check-sat command(s) [2021-11-23 01:58:38,928 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 01:58:38,932 INFO L263 TraceCheckSpWp]: Trace formula consists of 999 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-23 01:58:38,936 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:58:39,285 INFO L134 CoverageAnalysis]: Checked inductivity of 3336 backedges. 378 proven. 405 refuted. 0 times theorem prover too weak. 2553 trivial. 0 not checked. [2021-11-23 01:58:39,286 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:58:40,948 INFO L134 CoverageAnalysis]: Checked inductivity of 3336 backedges. 382 proven. 441 refuted. 0 times theorem prover too weak. 2513 trivial. 0 not checked. [2021-11-23 01:58:40,948 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2143544246] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:58:40,948 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1890348631] [2021-11-23 01:58:40,950 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2021-11-23 01:58:40,950 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 01:58:40,950 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-23 01:58:40,951 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 01:58:40,951 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 15, 23] total 30 [2021-11-23 01:58:40,951 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1884700901] [2021-11-23 01:58:40,951 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 01:58:40,952 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2021-11-23 01:58:40,952 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 01:58:40,952 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-11-23 01:58:40,953 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=124, Invalid=746, Unknown=0, NotChecked=0, Total=870 [2021-11-23 01:58:40,953 INFO L87 Difference]: Start difference. First operand 423 states and 687 transitions. Second operand has 30 states, 28 states have (on average 2.142857142857143) internal successors, (60), 28 states have internal predecessors, (60), 21 states have call successors, (30), 1 states have call predecessors, (30), 15 states have return successors, (43), 19 states have call predecessors, (43), 21 states have call successors, (43) [2021-11-23 01:58:41,603 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 01:58:41,603 INFO L93 Difference]: Finished difference Result 837 states and 1573 transitions. [2021-11-23 01:58:41,604 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-11-23 01:58:41,604 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 28 states have (on average 2.142857142857143) internal successors, (60), 28 states have internal predecessors, (60), 21 states have call successors, (30), 1 states have call predecessors, (30), 15 states have return successors, (43), 19 states have call predecessors, (43), 21 states have call successors, (43) Word has length 223 [2021-11-23 01:58:41,604 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 01:58:41,611 INFO L225 Difference]: With dead ends: 837 [2021-11-23 01:58:41,611 INFO L226 Difference]: Without dead ends: 505 [2021-11-23 01:58:41,614 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 479 GetRequests, 431 SyntacticMatches, 2 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 412 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=381, Invalid=1875, Unknown=0, NotChecked=0, Total=2256 [2021-11-23 01:58:41,615 INFO L933 BasicCegarLoop]: 27 mSDtfsCounter, 115 mSDsluCounter, 197 mSDsCounter, 0 mSdLazyCounter, 744 mSolverCounterSat, 218 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 121 SdHoareTripleChecker+Valid, 209 SdHoareTripleChecker+Invalid, 962 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 218 IncrementalHoareTripleChecker+Valid, 744 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 01:58:41,616 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [121 Valid, 209 Invalid, 962 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [218 Valid, 744 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 01:58:41,617 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 505 states. [2021-11-23 01:58:41,669 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 505 to 413. [2021-11-23 01:58:41,671 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 413 states, 217 states have (on average 1.055299539170507) internal successors, (229), 213 states have internal predecessors, (229), 123 states have call successors, (123), 68 states have call predecessors, (123), 72 states have return successors, (264), 131 states have call predecessors, (264), 123 states have call successors, (264) [2021-11-23 01:58:41,674 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 413 states to 413 states and 616 transitions. [2021-11-23 01:58:41,675 INFO L78 Accepts]: Start accepts. Automaton has 413 states and 616 transitions. Word has length 223 [2021-11-23 01:58:41,675 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 01:58:41,676 INFO L470 AbstractCegarLoop]: Abstraction has 413 states and 616 transitions. [2021-11-23 01:58:41,676 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 28 states have (on average 2.142857142857143) internal successors, (60), 28 states have internal predecessors, (60), 21 states have call successors, (30), 1 states have call predecessors, (30), 15 states have return successors, (43), 19 states have call predecessors, (43), 21 states have call successors, (43) [2021-11-23 01:58:41,676 INFO L276 IsEmpty]: Start isEmpty. Operand 413 states and 616 transitions. [2021-11-23 01:58:41,684 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 350 [2021-11-23 01:58:41,684 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 01:58:41,685 INFO L514 BasicCegarLoop]: trace histogram [63, 63, 32, 31, 31, 31, 31, 31, 5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 01:58:41,724 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87491b03-22ff-477b-a977-7367de4c7410/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-23 01:58:41,901 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87491b03-22ff-477b-a977-7367de4c7410/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-11-23 01:58:41,901 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 01:58:41,902 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 01:58:41,902 INFO L85 PathProgramCache]: Analyzing trace with hash 247251005, now seen corresponding path program 12 times [2021-11-23 01:58:41,902 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 01:58:41,902 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1712032324] [2021-11-23 01:58:41,902 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:58:41,902 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 01:58:42,038 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:58:43,006 INFO L134 CoverageAnalysis]: Checked inductivity of 8794 backedges. 154 proven. 2940 refuted. 0 times theorem prover too weak. 5700 trivial. 0 not checked. [2021-11-23 01:58:43,007 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 01:58:43,007 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1712032324] [2021-11-23 01:58:43,007 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1712032324] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 01:58:43,007 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1990443160] [2021-11-23 01:58:43,007 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 01:58:43,008 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 01:58:43,008 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87491b03-22ff-477b-a977-7367de4c7410/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 01:58:43,011 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87491b03-22ff-477b-a977-7367de4c7410/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 01:58:43,018 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87491b03-22ff-477b-a977-7367de4c7410/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-23 01:58:43,355 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 01:58:43,355 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 01:58:43,366 INFO L263 TraceCheckSpWp]: Trace formula consists of 1651 conjuncts, 339 conjunts are in the unsatisfiable core [2021-11-23 01:58:43,376 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:58:44,810 INFO L134 CoverageAnalysis]: Checked inductivity of 8794 backedges. 0 proven. 2940 refuted. 0 times theorem prover too weak. 5854 trivial. 0 not checked. [2021-11-23 01:58:44,810 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:58:54,597 INFO L134 CoverageAnalysis]: Checked inductivity of 8794 backedges. 0 proven. 8644 refuted. 0 times theorem prover too weak. 150 trivial. 0 not checked. [2021-11-23 01:58:54,597 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1990443160] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:58:54,597 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [136030033] [2021-11-23 01:58:54,599 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2021-11-23 01:58:54,599 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 01:58:54,600 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-23 01:58:54,601 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 01:58:54,601 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 25, 108] total 139 [2021-11-23 01:58:54,602 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [223313217] [2021-11-23 01:58:54,602 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 01:58:54,603 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 139 states [2021-11-23 01:58:54,603 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 01:58:54,603 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 139 interpolants. [2021-11-23 01:58:54,606 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=493, Invalid=18689, Unknown=0, NotChecked=0, Total=19182 [2021-11-23 01:58:54,606 INFO L87 Difference]: Start difference. First operand 413 states and 616 transitions. Second operand has 139 states, 104 states have (on average 1.7115384615384615) internal successors, (178), 106 states have internal predecessors, (178), 54 states have call successors, (77), 36 states have call predecessors, (77), 68 states have return successors, (91), 70 states have call predecessors, (91), 54 states have call successors, (91) [2021-11-23 02:01:42,465 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:01:42,465 INFO L93 Difference]: Finished difference Result 1274 states and 2202 transitions. [2021-11-23 02:01:42,465 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 402 states. [2021-11-23 02:01:42,466 INFO L78 Accepts]: Start accepts. Automaton has has 139 states, 104 states have (on average 1.7115384615384615) internal successors, (178), 106 states have internal predecessors, (178), 54 states have call successors, (77), 36 states have call predecessors, (77), 68 states have return successors, (91), 70 states have call predecessors, (91), 54 states have call successors, (91) Word has length 349 [2021-11-23 02:01:42,467 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:01:42,481 INFO L225 Difference]: With dead ends: 1274 [2021-11-23 02:01:42,481 INFO L226 Difference]: Without dead ends: 1270 [2021-11-23 02:01:42,507 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1253 GetRequests, 691 SyntacticMatches, 40 SemanticMatches, 522 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 87745 ImplicationChecksByTransitivity, 145.9s TimeCoverageRelationStatistics Valid=37658, Invalid=236394, Unknown=0, NotChecked=0, Total=274052 [2021-11-23 02:01:42,508 INFO L933 BasicCegarLoop]: 102 mSDtfsCounter, 6922 mSDsluCounter, 2904 mSDsCounter, 0 mSdLazyCounter, 44306 mSolverCounterSat, 23903 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 21.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6930 SdHoareTripleChecker+Valid, 2997 SdHoareTripleChecker+Invalid, 68209 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.2s SdHoareTripleChecker+Time, 23903 IncrementalHoareTripleChecker+Valid, 44306 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 25.7s IncrementalHoareTripleChecker+Time [2021-11-23 02:01:42,508 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6930 Valid, 2997 Invalid, 68209 Unknown, 0 Unchecked, 0.2s Time], IncrementalHoareTripleChecker [23903 Valid, 44306 Invalid, 0 Unknown, 0 Unchecked, 25.7s Time] [2021-11-23 02:01:42,510 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1270 states. [2021-11-23 02:01:42,690 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1270 to 1097. [2021-11-23 02:01:42,694 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1097 states, 589 states have (on average 1.0492359932088284) internal successors, (618), 570 states have internal predecessors, (618), 324 states have call successors, (324), 196 states have call predecessors, (324), 183 states have return successors, (769), 330 states have call predecessors, (769), 324 states have call successors, (769) [2021-11-23 02:01:42,702 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1097 states to 1097 states and 1711 transitions. [2021-11-23 02:01:42,703 INFO L78 Accepts]: Start accepts. Automaton has 1097 states and 1711 transitions. Word has length 349 [2021-11-23 02:01:42,704 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:01:42,704 INFO L470 AbstractCegarLoop]: Abstraction has 1097 states and 1711 transitions. [2021-11-23 02:01:42,705 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 139 states, 104 states have (on average 1.7115384615384615) internal successors, (178), 106 states have internal predecessors, (178), 54 states have call successors, (77), 36 states have call predecessors, (77), 68 states have return successors, (91), 70 states have call predecessors, (91), 54 states have call successors, (91) [2021-11-23 02:01:42,705 INFO L276 IsEmpty]: Start isEmpty. Operand 1097 states and 1711 transitions. [2021-11-23 02:01:42,721 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 356 [2021-11-23 02:01:42,721 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:01:42,721 INFO L514 BasicCegarLoop]: trace histogram [63, 63, 32, 31, 31, 31, 31, 31, 6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:01:42,761 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87491b03-22ff-477b-a977-7367de4c7410/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-23 02:01:42,942 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87491b03-22ff-477b-a977-7367de4c7410/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-11-23 02:01:42,943 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:01:42,943 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:01:42,943 INFO L85 PathProgramCache]: Analyzing trace with hash -2054178505, now seen corresponding path program 13 times [2021-11-23 02:01:42,943 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:01:42,943 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [411061166] [2021-11-23 02:01:42,944 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:01:42,944 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:01:43,036 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:01:43,225 INFO L134 CoverageAnalysis]: Checked inductivity of 8822 backedges. 254 proven. 1112 refuted. 0 times theorem prover too weak. 7456 trivial. 0 not checked. [2021-11-23 02:01:43,225 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:01:43,226 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [411061166] [2021-11-23 02:01:43,226 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [411061166] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:01:43,226 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [954676032] [2021-11-23 02:01:43,226 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 02:01:43,226 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:01:43,227 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87491b03-22ff-477b-a977-7367de4c7410/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:01:43,231 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87491b03-22ff-477b-a977-7367de4c7410/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:01:43,255 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87491b03-22ff-477b-a977-7367de4c7410/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-23 02:01:43,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:01:43,573 INFO L263 TraceCheckSpWp]: Trace formula consists of 1665 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-23 02:01:43,585 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:01:43,996 INFO L134 CoverageAnalysis]: Checked inductivity of 8822 backedges. 254 proven. 1112 refuted. 0 times theorem prover too weak. 7456 trivial. 0 not checked. [2021-11-23 02:01:43,996 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:01:46,470 INFO L134 CoverageAnalysis]: Checked inductivity of 8822 backedges. 254 proven. 1162 refuted. 0 times theorem prover too weak. 7406 trivial. 0 not checked. [2021-11-23 02:01:46,470 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [954676032] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:01:46,470 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [529166874] [2021-11-23 02:01:46,473 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2021-11-23 02:01:46,473 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:01:46,473 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-23 02:01:46,475 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:01:46,475 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 27] total 29 [2021-11-23 02:01:46,475 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [55026608] [2021-11-23 02:01:46,476 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:01:46,477 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2021-11-23 02:01:46,477 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:01:46,477 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-11-23 02:01:46,478 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=139, Invalid=673, Unknown=0, NotChecked=0, Total=812 [2021-11-23 02:01:46,478 INFO L87 Difference]: Start difference. First operand 1097 states and 1711 transitions. Second operand has 29 states, 28 states have (on average 2.0) internal successors, (56), 28 states have internal predecessors, (56), 19 states have call successors, (21), 1 states have call predecessors, (21), 13 states have return successors, (29), 13 states have call predecessors, (29), 19 states have call successors, (29) [2021-11-23 02:01:46,917 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:01:46,917 INFO L93 Difference]: Finished difference Result 1264 states and 2331 transitions. [2021-11-23 02:01:46,918 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-23 02:01:46,918 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 28 states have (on average 2.0) internal successors, (56), 28 states have internal predecessors, (56), 19 states have call successors, (21), 1 states have call predecessors, (21), 13 states have return successors, (29), 13 states have call predecessors, (29), 19 states have call successors, (29) Word has length 355 [2021-11-23 02:01:46,919 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:01:46,935 INFO L225 Difference]: With dead ends: 1264 [2021-11-23 02:01:46,935 INFO L226 Difference]: Without dead ends: 1237 [2021-11-23 02:01:46,937 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 747 GetRequests, 706 SyntacticMatches, 2 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 307 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=319, Invalid=1321, Unknown=0, NotChecked=0, Total=1640 [2021-11-23 02:01:46,938 INFO L933 BasicCegarLoop]: 23 mSDtfsCounter, 29 mSDsluCounter, 227 mSDsCounter, 0 mSdLazyCounter, 311 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 236 SdHoareTripleChecker+Invalid, 330 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 311 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:01:46,938 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [40 Valid, 236 Invalid, 330 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 311 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 02:01:46,940 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1237 states. [2021-11-23 02:01:47,129 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1237 to 1085. [2021-11-23 02:01:47,132 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1085 states, 580 states have (on average 1.0482758620689656) internal successors, (608), 560 states have internal predecessors, (608), 324 states have call successors, (324), 195 states have call predecessors, (324), 180 states have return successors, (819), 329 states have call predecessors, (819), 324 states have call successors, (819) [2021-11-23 02:01:47,141 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1085 states to 1085 states and 1751 transitions. [2021-11-23 02:01:47,143 INFO L78 Accepts]: Start accepts. Automaton has 1085 states and 1751 transitions. Word has length 355 [2021-11-23 02:01:47,144 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:01:47,144 INFO L470 AbstractCegarLoop]: Abstraction has 1085 states and 1751 transitions. [2021-11-23 02:01:47,144 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 28 states have (on average 2.0) internal successors, (56), 28 states have internal predecessors, (56), 19 states have call successors, (21), 1 states have call predecessors, (21), 13 states have return successors, (29), 13 states have call predecessors, (29), 19 states have call successors, (29) [2021-11-23 02:01:47,144 INFO L276 IsEmpty]: Start isEmpty. Operand 1085 states and 1751 transitions. [2021-11-23 02:01:47,172 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 750 [2021-11-23 02:01:47,172 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:01:47,172 INFO L514 BasicCegarLoop]: trace histogram [143, 143, 72, 71, 71, 71, 71, 71, 5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:01:47,212 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87491b03-22ff-477b-a977-7367de4c7410/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-11-23 02:01:47,390 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87491b03-22ff-477b-a977-7367de4c7410/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:01:47,391 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:01:47,391 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:01:47,391 INFO L85 PathProgramCache]: Analyzing trace with hash 1881782333, now seen corresponding path program 14 times [2021-11-23 02:01:47,391 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:01:47,391 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1711743246] [2021-11-23 02:01:47,391 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:01:47,392 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:01:47,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:01:47,987 INFO L134 CoverageAnalysis]: Checked inductivity of 45634 backedges. 3431 proven. 3558 refuted. 0 times theorem prover too weak. 38645 trivial. 0 not checked. [2021-11-23 02:01:47,987 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:01:47,987 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1711743246] [2021-11-23 02:01:47,988 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1711743246] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:01:47,988 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [439513810] [2021-11-23 02:01:47,988 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:01:47,988 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:01:47,988 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87491b03-22ff-477b-a977-7367de4c7410/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:01:47,989 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87491b03-22ff-477b-a977-7367de4c7410/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:01:48,013 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87491b03-22ff-477b-a977-7367de4c7410/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-23 02:01:48,438 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2021-11-23 02:01:48,438 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:01:48,443 INFO L263 TraceCheckSpWp]: Trace formula consists of 647 conjuncts, 47 conjunts are in the unsatisfiable core [2021-11-23 02:01:48,457 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:01:49,556 INFO L134 CoverageAnalysis]: Checked inductivity of 45634 backedges. 524 proven. 2798 refuted. 0 times theorem prover too weak. 42312 trivial. 0 not checked. [2021-11-23 02:01:49,557 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:01:52,960 INFO L134 CoverageAnalysis]: Checked inductivity of 45634 backedges. 524 proven. 2839 refuted. 0 times theorem prover too weak. 42271 trivial. 0 not checked. [2021-11-23 02:01:52,961 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [439513810] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:01:52,961 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [647846969] [2021-11-23 02:01:52,965 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2021-11-23 02:01:52,965 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:01:52,966 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-23 02:01:52,967 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:01:52,968 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 16, 25] total 43 [2021-11-23 02:01:52,968 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1616652373] [2021-11-23 02:01:52,968 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:01:52,970 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2021-11-23 02:01:52,970 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:01:52,971 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-11-23 02:01:52,971 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=215, Invalid=1591, Unknown=0, NotChecked=0, Total=1806 [2021-11-23 02:01:52,972 INFO L87 Difference]: Start difference. First operand 1085 states and 1751 transitions. Second operand has 43 states, 41 states have (on average 1.8780487804878048) internal successors, (77), 41 states have internal predecessors, (77), 32 states have call successors, (37), 1 states have call predecessors, (37), 26 states have return successors, (55), 26 states have call predecessors, (55), 32 states have call successors, (55) [2021-11-23 02:01:54,153 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:01:54,153 INFO L93 Difference]: Finished difference Result 2110 states and 3739 transitions. [2021-11-23 02:01:54,153 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-11-23 02:01:54,153 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 41 states have (on average 1.8780487804878048) internal successors, (77), 41 states have internal predecessors, (77), 32 states have call successors, (37), 1 states have call predecessors, (37), 26 states have return successors, (55), 26 states have call predecessors, (55), 32 states have call successors, (55) Word has length 749 [2021-11-23 02:01:54,154 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:01:54,167 INFO L225 Difference]: With dead ends: 2110 [2021-11-23 02:01:54,167 INFO L226 Difference]: Without dead ends: 1305 [2021-11-23 02:01:54,175 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1551 GetRequests, 1484 SyntacticMatches, 0 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 921 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=748, Invalid=3944, Unknown=0, NotChecked=0, Total=4692 [2021-11-23 02:01:54,176 INFO L933 BasicCegarLoop]: 37 mSDtfsCounter, 234 mSDsluCounter, 496 mSDsCounter, 0 mSdLazyCounter, 1339 mSolverCounterSat, 471 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 241 SdHoareTripleChecker+Valid, 506 SdHoareTripleChecker+Invalid, 1810 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 471 IncrementalHoareTripleChecker+Valid, 1339 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-23 02:01:54,176 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [241 Valid, 506 Invalid, 1810 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [471 Valid, 1339 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-23 02:01:54,178 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1305 states. [2021-11-23 02:01:54,344 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1305 to 1068. [2021-11-23 02:01:54,347 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1068 states, 524 states have (on average 1.0515267175572518) internal successors, (551), 524 states have internal predecessors, (551), 335 states have call successors, (335), 153 states have call predecessors, (335), 208 states have return successors, (562), 390 states have call predecessors, (562), 335 states have call successors, (562) [2021-11-23 02:01:54,354 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1068 states to 1068 states and 1448 transitions. [2021-11-23 02:01:54,356 INFO L78 Accepts]: Start accepts. Automaton has 1068 states and 1448 transitions. Word has length 749 [2021-11-23 02:01:54,358 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:01:54,358 INFO L470 AbstractCegarLoop]: Abstraction has 1068 states and 1448 transitions. [2021-11-23 02:01:54,358 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 41 states have (on average 1.8780487804878048) internal successors, (77), 41 states have internal predecessors, (77), 32 states have call successors, (37), 1 states have call predecessors, (37), 26 states have return successors, (55), 26 states have call predecessors, (55), 32 states have call successors, (55) [2021-11-23 02:01:54,358 INFO L276 IsEmpty]: Start isEmpty. Operand 1068 states and 1448 transitions. [2021-11-23 02:01:54,370 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 676 [2021-11-23 02:01:54,371 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:01:54,371 INFO L514 BasicCegarLoop]: trace histogram [127, 127, 64, 63, 63, 63, 63, 63, 6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:01:54,414 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87491b03-22ff-477b-a977-7367de4c7410/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-23 02:01:54,586 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87491b03-22ff-477b-a977-7367de4c7410/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-11-23 02:01:54,587 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:01:54,587 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:01:54,587 INFO L85 PathProgramCache]: Analyzing trace with hash -866850505, now seen corresponding path program 15 times [2021-11-23 02:01:54,587 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:01:54,587 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1255520701] [2021-11-23 02:01:54,588 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:01:54,588 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:01:54,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:01:56,539 INFO L134 CoverageAnalysis]: Checked inductivity of 35990 backedges. 314 proven. 12010 refuted. 0 times theorem prover too weak. 23666 trivial. 0 not checked. [2021-11-23 02:01:56,539 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:01:56,539 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1255520701] [2021-11-23 02:01:56,539 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1255520701] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:01:56,539 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1942454753] [2021-11-23 02:01:56,540 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 02:01:56,540 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:01:56,540 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87491b03-22ff-477b-a977-7367de4c7410/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:01:56,540 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87491b03-22ff-477b-a977-7367de4c7410/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:01:56,541 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_87491b03-22ff-477b-a977-7367de4c7410/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-23 02:01:57,033 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 02:01:57,033 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:01:57,053 INFO L263 TraceCheckSpWp]: Trace formula consists of 3233 conjuncts, 663 conjunts are in the unsatisfiable core [2021-11-23 02:01:57,069 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:01:59,700 INFO L134 CoverageAnalysis]: Checked inductivity of 35990 backedges. 0 proven. 12010 refuted. 0 times theorem prover too weak. 23980 trivial. 0 not checked. [2021-11-23 02:01:59,700 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:02:25,849 INFO L134 CoverageAnalysis]: Checked inductivity of 35990 backedges. 0 proven. 35698 refuted. 0 times theorem prover too weak. 292 trivial. 0 not checked. [2021-11-23 02:02:25,850 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1942454753] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:02:25,850 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1359395883] [2021-11-23 02:02:25,852 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2021-11-23 02:02:25,852 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:02:25,853 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-23 02:02:25,856 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:02:25,857 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 29, 206] total 243 [2021-11-23 02:02:25,857 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1828464850] [2021-11-23 02:02:25,858 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:02:25,860 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 243 states [2021-11-23 02:02:25,860 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:02:25,861 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 243 interpolants. [2021-11-23 02:02:25,867 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=833, Invalid=57973, Unknown=0, NotChecked=0, Total=58806 [2021-11-23 02:02:25,868 INFO L87 Difference]: Start difference. First operand 1068 states and 1448 transitions. Second operand has 243 states, 175 states have (on average 1.7885714285714285) internal successors, (313), 190 states have internal predecessors, (313), 103 states have call successors, (142), 68 states have call predecessors, (142), 120 states have return successors, (160), 123 states have call predecessors, (160), 103 states have call successors, (160)