./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/recursive-simple/fibo_2calls_25-1.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_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/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_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/config/TaipanReach.xml -i ../../sv-benchmarks/c/recursive-simple/fibo_2calls_25-1.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/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_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/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 1a779a25b3e5147f7c14d79ede7be3f2d2de62e2de15b88047fe2a162a63a762 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-aef121e [2021-11-23 03:30:09,412 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 03:30:09,413 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 03:30:09,464 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 03:30:09,465 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 03:30:09,471 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 03:30:09,473 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 03:30:09,477 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 03:30:09,480 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 03:30:09,487 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 03:30:09,489 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 03:30:09,490 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 03:30:09,491 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 03:30:09,494 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 03:30:09,496 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 03:30:09,502 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 03:30:09,503 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 03:30:09,505 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 03:30:09,507 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 03:30:09,516 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 03:30:09,518 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 03:30:09,521 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 03:30:09,524 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 03:30:09,525 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 03:30:09,529 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 03:30:09,529 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 03:30:09,530 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 03:30:09,531 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 03:30:09,532 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 03:30:09,534 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 03:30:09,535 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 03:30:09,535 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 03:30:09,537 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 03:30:09,539 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 03:30:09,540 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 03:30:09,541 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 03:30:09,541 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 03:30:09,541 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 03:30:09,542 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 03:30:09,543 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 03:30:09,543 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 03:30:09,544 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-23 03:30:09,592 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 03:30:09,593 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 03:30:09,593 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 03:30:09,594 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 03:30:09,601 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 03:30:09,601 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 03:30:09,601 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 03:30:09,601 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 03:30:09,601 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 03:30:09,602 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 03:30:09,603 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 03:30:09,603 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 03:30:09,603 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 03:30:09,604 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 03:30:09,604 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 03:30:09,604 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 03:30:09,604 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 03:30:09,604 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 03:30:09,605 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 03:30:09,605 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 03:30:09,606 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 03:30:09,606 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 03:30:09,606 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 03:30:09,606 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 03:30:09,606 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 03:30:09,606 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 03:30:09,609 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 03:30:09,609 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 03:30:09,609 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 03:30:09,609 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 03:30:09,610 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 03:30:09,610 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 03:30:09,610 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 03:30:09,610 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 03:30:09,611 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 03:30:09,611 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 03:30:09,611 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 03:30:09,611 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 03:30:09,611 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 03:30:09,611 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 03:30:09,612 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 03:30:09,612 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_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 1a779a25b3e5147f7c14d79ede7be3f2d2de62e2de15b88047fe2a162a63a762 [2021-11-23 03:30:09,877 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 03:30:09,899 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 03:30:09,901 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 03:30:09,903 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 03:30:09,903 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 03:30:09,905 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/../../sv-benchmarks/c/recursive-simple/fibo_2calls_25-1.c [2021-11-23 03:30:09,970 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/data/e4cb86670/40f563141af34fbca228de7b9194e6df/FLAG0f2bd6262 [2021-11-23 03:30:10,416 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 03:30:10,417 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/sv-benchmarks/c/recursive-simple/fibo_2calls_25-1.c [2021-11-23 03:30:10,428 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/data/e4cb86670/40f563141af34fbca228de7b9194e6df/FLAG0f2bd6262 [2021-11-23 03:30:10,784 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/data/e4cb86670/40f563141af34fbca228de7b9194e6df [2021-11-23 03:30:10,786 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 03:30:10,788 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 03:30:10,790 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 03:30:10,790 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 03:30:10,793 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 03:30:10,794 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 03:30:10" (1/1) ... [2021-11-23 03:30:10,795 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@18e8f8ee and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:30:10, skipping insertion in model container [2021-11-23 03:30:10,795 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 03:30:10" (1/1) ... [2021-11-23 03:30:10,803 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 03:30:10,816 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 03:30:11,034 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_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/sv-benchmarks/c/recursive-simple/fibo_2calls_25-1.c[952,965] [2021-11-23 03:30:11,038 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 03:30:11,048 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 03:30:11,070 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_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/sv-benchmarks/c/recursive-simple/fibo_2calls_25-1.c[952,965] [2021-11-23 03:30:11,071 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 03:30:11,086 INFO L208 MainTranslator]: Completed translation [2021-11-23 03:30:11,087 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:30:11 WrapperNode [2021-11-23 03:30:11,087 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 03:30:11,088 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 03:30:11,089 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 03:30:11,089 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 03:30:11,101 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:30:11" (1/1) ... [2021-11-23 03:30:11,108 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:30:11" (1/1) ... [2021-11-23 03:30:11,124 INFO L137 Inliner]: procedures = 14, calls = 12, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 21 [2021-11-23 03:30:11,125 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 03:30:11,127 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 03:30:11,127 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 03:30:11,127 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 03:30:11,135 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:30:11" (1/1) ... [2021-11-23 03:30:11,135 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:30:11" (1/1) ... [2021-11-23 03:30:11,146 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:30:11" (1/1) ... [2021-11-23 03:30:11,147 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:30:11" (1/1) ... [2021-11-23 03:30:11,154 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:30:11" (1/1) ... [2021-11-23 03:30:11,157 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:30:11" (1/1) ... [2021-11-23 03:30:11,159 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:30:11" (1/1) ... [2021-11-23 03:30:11,165 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 03:30:11,167 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 03:30:11,168 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 03:30:11,168 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 03:30:11,169 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:30:11" (1/1) ... [2021-11-23 03:30:11,177 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 03:30:11,191 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:30:11,204 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 03:30:11,225 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 03:30:11,256 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 03:30:11,256 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 03:30:11,257 INFO L130 BoogieDeclarations]: Found specification of procedure fibo2 [2021-11-23 03:30:11,257 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo2 [2021-11-23 03:30:11,257 INFO L130 BoogieDeclarations]: Found specification of procedure fibo1 [2021-11-23 03:30:11,258 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo1 [2021-11-23 03:30:11,258 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 03:30:11,258 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 03:30:11,326 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 03:30:11,328 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 03:30:11,489 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 03:30:11,514 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 03:30:11,514 INFO L301 CfgBuilder]: Removed 0 assume(true) statements. [2021-11-23 03:30:11,517 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 03:30:11 BoogieIcfgContainer [2021-11-23 03:30:11,517 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 03:30:11,519 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 03:30:11,519 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 03:30:11,533 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 03:30:11,534 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 03:30:10" (1/3) ... [2021-11-23 03:30:11,534 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@534357bc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 03:30:11, skipping insertion in model container [2021-11-23 03:30:11,535 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:30:11" (2/3) ... [2021-11-23 03:30:11,535 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@534357bc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 03:30:11, skipping insertion in model container [2021-11-23 03:30:11,535 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 03:30:11" (3/3) ... [2021-11-23 03:30:11,537 INFO L111 eAbstractionObserver]: Analyzing ICFG fibo_2calls_25-1.c [2021-11-23 03:30:11,542 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 03:30:11,549 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-23 03:30:11,596 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 03:30:11,604 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 03:30:11,604 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-23 03:30:11,637 INFO L276 IsEmpty]: Start isEmpty. Operand has 26 states, 17 states have (on average 1.3529411764705883) internal successors, (23), 18 states have internal predecessors, (23), 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 03:30:11,642 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-11-23 03:30:11,643 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:30:11,643 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:30:11,644 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:30:11,658 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:30:11,659 INFO L85 PathProgramCache]: Analyzing trace with hash 2097990987, now seen corresponding path program 1 times [2021-11-23 03:30:11,668 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:30:11,669 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [348138416] [2021-11-23 03:30:11,669 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:30:11,670 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:30:11,787 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:30:11,914 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 03:30:11,915 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:30:11,915 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [348138416] [2021-11-23 03:30:11,916 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [348138416] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:30:11,917 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:30:11,917 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 03:30:11,919 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1626999341] [2021-11-23 03:30:11,920 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:30:11,924 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 03:30:11,924 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:30:11,959 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 03:30:11,961 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 03:30:11,963 INFO L87 Difference]: Start difference. First operand has 26 states, 17 states have (on average 1.3529411764705883) internal successors, (23), 18 states have internal predecessors, (23), 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, 5 states have (on average 1.4) internal successors, (7), 4 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-23 03:30:12,031 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:30:12,031 INFO L93 Difference]: Finished difference Result 36 states and 44 transitions. [2021-11-23 03:30:12,034 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 03:30:12,036 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.4) internal successors, (7), 4 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 9 [2021-11-23 03:30:12,036 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:30:12,045 INFO L225 Difference]: With dead ends: 36 [2021-11-23 03:30:12,047 INFO L226 Difference]: Without dead ends: 26 [2021-11-23 03:30:12,053 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 03:30:12,059 INFO L933 BasicCegarLoop]: 28 mSDtfsCounter, 2 mSDsluCounter, 84 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 108 SdHoareTripleChecker+Invalid, 19 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 03:30:12,061 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 108 Invalid, 19 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 19 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 03:30:12,079 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2021-11-23 03:30:12,099 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2021-11-23 03:30:12,100 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 17 states have (on average 1.2352941176470589) internal successors, (21), 18 states have internal predecessors, (21), 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 03:30:12,102 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 33 transitions. [2021-11-23 03:30:12,103 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 33 transitions. Word has length 9 [2021-11-23 03:30:12,103 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:30:12,104 INFO L470 AbstractCegarLoop]: Abstraction has 26 states and 33 transitions. [2021-11-23 03:30:12,104 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.4) internal successors, (7), 4 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-23 03:30:12,104 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 33 transitions. [2021-11-23 03:30:12,105 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-11-23 03:30:12,106 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:30:12,106 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:30:12,106 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-23 03:30:12,106 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:30:12,107 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:30:12,107 INFO L85 PathProgramCache]: Analyzing trace with hash 1328370967, now seen corresponding path program 1 times [2021-11-23 03:30:12,108 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:30:12,108 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1023333813] [2021-11-23 03:30:12,108 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:30:12,108 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:30:12,118 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:30:12,164 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 03:30:12,164 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:30:12,164 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1023333813] [2021-11-23 03:30:12,165 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1023333813] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:30:12,165 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:30:12,165 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 03:30:12,165 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2139438209] [2021-11-23 03:30:12,166 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:30:12,167 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 03:30:12,167 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:30:12,168 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 03:30:12,168 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 03:30:12,168 INFO L87 Difference]: Start difference. First operand 26 states and 33 transitions. Second operand has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-23 03:30:12,187 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:30:12,187 INFO L93 Difference]: Finished difference Result 32 states and 40 transitions. [2021-11-23 03:30:12,187 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 03:30:12,188 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 10 [2021-11-23 03:30:12,188 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:30:12,189 INFO L225 Difference]: With dead ends: 32 [2021-11-23 03:30:12,189 INFO L226 Difference]: Without dead ends: 28 [2021-11-23 03:30:12,190 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 03:30:12,192 INFO L933 BasicCegarLoop]: 31 mSDtfsCounter, 0 mSDsluCounter, 89 mSDsCounter, 0 mSdLazyCounter, 11 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 119 SdHoareTripleChecker+Invalid, 11 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 11 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 03:30:12,222 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 119 Invalid, 11 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 11 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 03:30:12,224 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2021-11-23 03:30:12,243 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 26. [2021-11-23 03:30:12,244 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 17 states have (on average 1.2352941176470589) internal successors, (21), 18 states have internal predecessors, (21), 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 03:30:12,245 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 33 transitions. [2021-11-23 03:30:12,246 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 33 transitions. Word has length 10 [2021-11-23 03:30:12,246 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:30:12,246 INFO L470 AbstractCegarLoop]: Abstraction has 26 states and 33 transitions. [2021-11-23 03:30:12,246 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-23 03:30:12,246 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 33 transitions. [2021-11-23 03:30:12,248 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-11-23 03:30:12,248 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:30:12,248 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:30:12,248 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-23 03:30:12,249 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:30:12,249 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:30:12,250 INFO L85 PathProgramCache]: Analyzing trace with hash -1296553538, now seen corresponding path program 1 times [2021-11-23 03:30:12,250 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:30:12,250 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1591636494] [2021-11-23 03:30:12,250 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:30:12,250 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:30:12,283 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:30:12,367 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 03:30:12,367 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:30:12,367 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1591636494] [2021-11-23 03:30:12,368 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1591636494] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:30:12,368 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [829981305] [2021-11-23 03:30:12,368 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:30:12,368 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:30:12,368 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:30:12,370 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:30:12,417 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-23 03:30:12,467 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:30:12,469 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 03:30:12,485 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:30:12,695 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 03:30:12,695 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:30:12,955 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 03:30:12,956 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [829981305] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:30:12,956 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1539698745] [2021-11-23 03:30:12,977 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-23 03:30:12,977 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:30:12,982 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:30:12,987 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:30:12,988 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:30:13,106 INFO L197 IcfgInterpreter]: Interpreting procedure fibo1 with input of size 39 for LOIs [2021-11-23 03:30:13,208 INFO L197 IcfgInterpreter]: Interpreting procedure fibo2 with input of size 39 for LOIs [2021-11-23 03:30:13,235 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:30:13,550 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [1539698745] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:30:13,551 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-23 03:30:13,551 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6, 7, 7] total 17 [2021-11-23 03:30:13,552 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1504193128] [2021-11-23 03:30:13,552 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:30:13,553 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 03:30:13,554 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:30:13,554 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 03:30:13,556 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=224, Unknown=0, NotChecked=0, Total=272 [2021-11-23 03:30:13,556 INFO L87 Difference]: Start difference. First operand 26 states and 33 transitions. Second operand has 7 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 4 states have internal predecessors, (13), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (3), 1 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-23 03:30:13,716 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:30:13,716 INFO L93 Difference]: Finished difference Result 68 states and 91 transitions. [2021-11-23 03:30:13,716 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 03:30:13,717 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 4 states have internal predecessors, (13), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (3), 1 states have call predecessors, (3), 3 states have call successors, (3) Word has length 22 [2021-11-23 03:30:13,717 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:30:13,724 INFO L225 Difference]: With dead ends: 68 [2021-11-23 03:30:13,724 INFO L226 Difference]: Without dead ends: 44 [2021-11-23 03:30:13,726 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 51 SyntacticMatches, 5 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=48, Invalid=224, Unknown=0, NotChecked=0, Total=272 [2021-11-23 03:30:13,729 INFO L933 BasicCegarLoop]: 30 mSDtfsCounter, 18 mSDsluCounter, 80 mSDsCounter, 0 mSdLazyCounter, 69 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 110 SdHoareTripleChecker+Invalid, 74 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 69 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:30:13,731 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [23 Valid, 110 Invalid, 74 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 69 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:30:13,733 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2021-11-23 03:30:13,748 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 42. [2021-11-23 03:30:13,749 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 28 states have (on average 1.1428571428571428) internal successors, (32), 28 states have internal predecessors, (32), 9 states have call successors, (9), 4 states have call predecessors, (9), 4 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-11-23 03:30:13,751 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 50 transitions. [2021-11-23 03:30:13,751 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 50 transitions. Word has length 22 [2021-11-23 03:30:13,751 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:30:13,752 INFO L470 AbstractCegarLoop]: Abstraction has 42 states and 50 transitions. [2021-11-23 03:30:13,754 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 4 states have internal predecessors, (13), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (3), 1 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-23 03:30:13,754 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 50 transitions. [2021-11-23 03:30:13,758 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-11-23 03:30:13,758 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:30:13,759 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, 1, 1, 1, 1] [2021-11-23 03:30:13,804 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-23 03:30:13,978 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-11-23 03:30:13,978 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:30:13,978 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:30:13,979 INFO L85 PathProgramCache]: Analyzing trace with hash -28918515, now seen corresponding path program 1 times [2021-11-23 03:30:13,979 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:30:13,979 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [272767918] [2021-11-23 03:30:13,979 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:30:13,979 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:30:14,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:30:14,067 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 5 proven. 5 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 03:30:14,068 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:30:14,071 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [272767918] [2021-11-23 03:30:14,072 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [272767918] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:30:14,074 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1387181526] [2021-11-23 03:30:14,074 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:30:14,074 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:30:14,075 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:30:14,076 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:30:14,097 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-23 03:30:14,131 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:30:14,133 INFO L263 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 03:30:14,135 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:30:14,257 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-23 03:30:14,257 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:30:14,663 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 03:30:14,664 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1387181526] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:30:14,664 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [974266251] [2021-11-23 03:30:14,677 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2021-11-23 03:30:14,682 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:30:14,684 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 03:30:14,687 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 03:30:14,687 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 8, 9] total 14 [2021-11-23 03:30:14,687 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1500269683] [2021-11-23 03:30:14,688 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 03:30:14,688 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-23 03:30:14,689 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:30:14,690 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-23 03:30:14,690 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2021-11-23 03:30:14,691 INFO L87 Difference]: Start difference. First operand 42 states and 50 transitions. Second operand has 14 states, 11 states have (on average 4.0) internal successors, (44), 14 states have internal predecessors, (44), 11 states have call successors, (13), 1 states have call predecessors, (13), 5 states have return successors, (13), 3 states have call predecessors, (13), 11 states have call successors, (13) [2021-11-23 03:30:14,882 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:30:14,883 INFO L93 Difference]: Finished difference Result 85 states and 121 transitions. [2021-11-23 03:30:14,883 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-23 03:30:14,883 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 11 states have (on average 4.0) internal successors, (44), 14 states have internal predecessors, (44), 11 states have call successors, (13), 1 states have call predecessors, (13), 5 states have return successors, (13), 3 states have call predecessors, (13), 11 states have call successors, (13) Word has length 35 [2021-11-23 03:30:14,884 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:30:14,888 INFO L225 Difference]: With dead ends: 85 [2021-11-23 03:30:14,888 INFO L226 Difference]: Without dead ends: 53 [2021-11-23 03:30:14,890 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 62 SyntacticMatches, 4 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 45 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=75, Invalid=305, Unknown=0, NotChecked=0, Total=380 [2021-11-23 03:30:14,895 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 39 mSDsluCounter, 108 mSDsCounter, 0 mSdLazyCounter, 161 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 119 SdHoareTripleChecker+Invalid, 189 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 161 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:30:14,899 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [44 Valid, 119 Invalid, 189 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 161 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:30:14,902 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2021-11-23 03:30:14,918 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 44. [2021-11-23 03:30:14,919 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 29 states have (on average 1.1379310344827587) internal successors, (33), 30 states have internal predecessors, (33), 9 states have call successors, (9), 4 states have call predecessors, (9), 5 states have return successors, (11), 9 states have call predecessors, (11), 9 states have call successors, (11) [2021-11-23 03:30:14,923 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 53 transitions. [2021-11-23 03:30:14,924 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 53 transitions. Word has length 35 [2021-11-23 03:30:14,924 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:30:14,924 INFO L470 AbstractCegarLoop]: Abstraction has 44 states and 53 transitions. [2021-11-23 03:30:14,925 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 11 states have (on average 4.0) internal successors, (44), 14 states have internal predecessors, (44), 11 states have call successors, (13), 1 states have call predecessors, (13), 5 states have return successors, (13), 3 states have call predecessors, (13), 11 states have call successors, (13) [2021-11-23 03:30:14,926 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 53 transitions. [2021-11-23 03:30:14,932 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-11-23 03:30:14,933 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:30:14,934 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, 1, 1, 1, 1, 1] [2021-11-23 03:30:14,969 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-23 03:30:15,157 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:30:15,158 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:30:15,158 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:30:15,158 INFO L85 PathProgramCache]: Analyzing trace with hash -243412115, now seen corresponding path program 1 times [2021-11-23 03:30:15,158 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:30:15,158 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1021747362] [2021-11-23 03:30:15,158 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:30:15,159 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:30:15,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:30:15,254 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 03:30:15,254 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:30:15,254 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1021747362] [2021-11-23 03:30:15,254 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1021747362] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:30:15,255 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1295649018] [2021-11-23 03:30:15,255 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:30:15,255 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:30:15,255 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:30:15,256 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:30:15,276 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-23 03:30:15,300 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:30:15,302 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 03:30:15,304 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:30:15,430 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 03:30:15,430 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:30:15,796 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 11 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 03:30:15,797 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1295649018] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:30:15,797 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1104486436] [2021-11-23 03:30:15,801 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2021-11-23 03:30:15,802 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:30:15,802 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 03:30:15,803 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 03:30:15,803 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 9] total 18 [2021-11-23 03:30:15,803 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2000579087] [2021-11-23 03:30:15,803 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 03:30:15,805 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-23 03:30:15,806 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:30:15,806 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-23 03:30:15,806 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2021-11-23 03:30:15,806 INFO L87 Difference]: Start difference. First operand 44 states and 53 transitions. Second operand has 18 states, 16 states have (on average 3.0625) internal successors, (49), 18 states have internal predecessors, (49), 11 states have call successors, (13), 1 states have call predecessors, (13), 7 states have return successors, (13), 6 states have call predecessors, (13), 11 states have call successors, (13) [2021-11-23 03:30:16,321 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:30:16,321 INFO L93 Difference]: Finished difference Result 121 states and 203 transitions. [2021-11-23 03:30:16,322 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-23 03:30:16,322 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 16 states have (on average 3.0625) internal successors, (49), 18 states have internal predecessors, (49), 11 states have call successors, (13), 1 states have call predecessors, (13), 7 states have return successors, (13), 6 states have call predecessors, (13), 11 states have call successors, (13) Word has length 36 [2021-11-23 03:30:16,322 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:30:16,324 INFO L225 Difference]: With dead ends: 121 [2021-11-23 03:30:16,324 INFO L226 Difference]: Without dead ends: 77 [2021-11-23 03:30:16,326 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 71 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 105 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=142, Invalid=670, Unknown=0, NotChecked=0, Total=812 [2021-11-23 03:30:16,327 INFO L933 BasicCegarLoop]: 28 mSDtfsCounter, 72 mSDsluCounter, 231 mSDsCounter, 0 mSdLazyCounter, 432 mSolverCounterSat, 95 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 76 SdHoareTripleChecker+Valid, 250 SdHoareTripleChecker+Invalid, 527 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 95 IncrementalHoareTripleChecker+Valid, 432 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 03:30:16,328 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [76 Valid, 250 Invalid, 527 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [95 Valid, 432 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-23 03:30:16,329 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2021-11-23 03:30:16,342 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 63. [2021-11-23 03:30:16,342 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 40 states have (on average 1.15) internal successors, (46), 43 states have internal predecessors, (46), 14 states have call successors, (14), 5 states have call predecessors, (14), 8 states have return successors, (31), 14 states have call predecessors, (31), 14 states have call successors, (31) [2021-11-23 03:30:16,344 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 91 transitions. [2021-11-23 03:30:16,345 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 91 transitions. Word has length 36 [2021-11-23 03:30:16,345 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:30:16,345 INFO L470 AbstractCegarLoop]: Abstraction has 63 states and 91 transitions. [2021-11-23 03:30:16,346 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 16 states have (on average 3.0625) internal successors, (49), 18 states have internal predecessors, (49), 11 states have call successors, (13), 1 states have call predecessors, (13), 7 states have return successors, (13), 6 states have call predecessors, (13), 11 states have call successors, (13) [2021-11-23 03:30:16,346 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 91 transitions. [2021-11-23 03:30:16,349 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-11-23 03:30:16,349 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:30:16,349 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:30:16,390 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-23 03:30:16,573 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:30:16,574 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:30:16,574 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:30:16,574 INFO L85 PathProgramCache]: Analyzing trace with hash 403750738, now seen corresponding path program 1 times [2021-11-23 03:30:16,574 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:30:16,574 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2136143096] [2021-11-23 03:30:16,575 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:30:16,575 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:30:16,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:30:16,663 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 12 proven. 12 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-23 03:30:16,663 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:30:16,663 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2136143096] [2021-11-23 03:30:16,663 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2136143096] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:30:16,663 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1595362826] [2021-11-23 03:30:16,663 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:30:16,664 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:30:16,664 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:30:16,665 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:30:16,681 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-23 03:30:16,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:30:16,719 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 03:30:16,722 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:30:16,854 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 4 proven. 23 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-11-23 03:30:16,854 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:30:17,401 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 4 proven. 28 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-23 03:30:17,401 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1595362826] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:30:17,401 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [65840189] [2021-11-23 03:30:17,406 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2021-11-23 03:30:17,406 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:30:17,408 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 03:30:17,408 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 03:30:17,408 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9, 11] total 17 [2021-11-23 03:30:17,408 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [371514341] [2021-11-23 03:30:17,408 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 03:30:17,410 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-23 03:30:17,410 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:30:17,411 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-23 03:30:17,411 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2021-11-23 03:30:17,412 INFO L87 Difference]: Start difference. First operand 63 states and 91 transitions. Second operand has 17 states, 15 states have (on average 3.6) internal successors, (54), 17 states have internal predecessors, (54), 12 states have call successors, (14), 1 states have call predecessors, (14), 8 states have return successors, (18), 8 states have call predecessors, (18), 12 states have call successors, (18) [2021-11-23 03:30:17,648 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:30:17,648 INFO L93 Difference]: Finished difference Result 119 states and 203 transitions. [2021-11-23 03:30:17,649 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-23 03:30:17,649 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 15 states have (on average 3.6) internal successors, (54), 17 states have internal predecessors, (54), 12 states have call successors, (14), 1 states have call predecessors, (14), 8 states have return successors, (18), 8 states have call predecessors, (18), 12 states have call successors, (18) Word has length 50 [2021-11-23 03:30:17,649 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:30:17,654 INFO L225 Difference]: With dead ends: 119 [2021-11-23 03:30:17,654 INFO L226 Difference]: Without dead ends: 97 [2021-11-23 03:30:17,656 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 95 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 76 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=115, Invalid=437, Unknown=0, NotChecked=0, Total=552 [2021-11-23 03:30:17,658 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 58 mSDsluCounter, 108 mSDsCounter, 0 mSdLazyCounter, 157 mSolverCounterSat, 68 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 71 SdHoareTripleChecker+Valid, 117 SdHoareTripleChecker+Invalid, 225 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 68 IncrementalHoareTripleChecker+Valid, 157 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:30:17,658 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [71 Valid, 117 Invalid, 225 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [68 Valid, 157 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:30:17,659 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2021-11-23 03:30:17,697 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 72. [2021-11-23 03:30:17,698 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 72 states, 46 states have (on average 1.1304347826086956) internal successors, (52), 49 states have internal predecessors, (52), 14 states have call successors, (14), 5 states have call predecessors, (14), 11 states have return successors, (39), 17 states have call predecessors, (39), 14 states have call successors, (39) [2021-11-23 03:30:17,704 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 105 transitions. [2021-11-23 03:30:17,704 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 105 transitions. Word has length 50 [2021-11-23 03:30:17,706 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:30:17,706 INFO L470 AbstractCegarLoop]: Abstraction has 72 states and 105 transitions. [2021-11-23 03:30:17,708 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 15 states have (on average 3.6) internal successors, (54), 17 states have internal predecessors, (54), 12 states have call successors, (14), 1 states have call predecessors, (14), 8 states have return successors, (18), 8 states have call predecessors, (18), 12 states have call successors, (18) [2021-11-23 03:30:17,708 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 105 transitions. [2021-11-23 03:30:17,712 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-11-23 03:30:17,717 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:30:17,717 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 6, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:30:17,752 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-23 03:30:17,918 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:30:17,918 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:30:17,918 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:30:17,918 INFO L85 PathProgramCache]: Analyzing trace with hash 1766289300, now seen corresponding path program 1 times [2021-11-23 03:30:17,919 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:30:17,919 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1864675423] [2021-11-23 03:30:17,919 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:30:17,919 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:30:17,962 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:30:18,102 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 39 proven. 42 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2021-11-23 03:30:18,102 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:30:18,103 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1864675423] [2021-11-23 03:30:18,103 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1864675423] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:30:18,103 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1412570655] [2021-11-23 03:30:18,103 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:30:18,103 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:30:18,103 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:30:18,106 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:30:18,111 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-23 03:30:18,164 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:30:18,165 INFO L263 TraceCheckSpWp]: Trace formula consists of 201 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-23 03:30:18,169 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:30:18,385 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 12 proven. 71 refuted. 0 times theorem prover too weak. 62 trivial. 0 not checked. [2021-11-23 03:30:18,385 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:30:19,226 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 12 proven. 81 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2021-11-23 03:30:19,226 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1412570655] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:30:19,226 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [597004029] [2021-11-23 03:30:19,229 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2021-11-23 03:30:19,229 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:30:19,230 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 03:30:19,231 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 03:30:19,231 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 13] total 23 [2021-11-23 03:30:19,231 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [194876735] [2021-11-23 03:30:19,231 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 03:30:19,232 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-11-23 03:30:19,232 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:30:19,233 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-11-23 03:30:19,233 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=439, Unknown=0, NotChecked=0, Total=506 [2021-11-23 03:30:19,234 INFO L87 Difference]: Start difference. First operand 72 states and 105 transitions. Second operand has 23 states, 21 states have (on average 3.4285714285714284) internal successors, (72), 23 states have internal predecessors, (72), 18 states have call successors, (22), 1 states have call predecessors, (22), 9 states have return successors, (25), 10 states have call predecessors, (25), 18 states have call successors, (25) [2021-11-23 03:30:19,991 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:30:19,991 INFO L93 Difference]: Finished difference Result 204 states and 411 transitions. [2021-11-23 03:30:19,992 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-23 03:30:19,992 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 21 states have (on average 3.4285714285714284) internal successors, (72), 23 states have internal predecessors, (72), 18 states have call successors, (22), 1 states have call predecessors, (22), 9 states have return successors, (25), 10 states have call predecessors, (25), 18 states have call successors, (25) Word has length 79 [2021-11-23 03:30:19,993 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:30:19,998 INFO L225 Difference]: With dead ends: 204 [2021-11-23 03:30:19,998 INFO L226 Difference]: Without dead ends: 115 [2021-11-23 03:30:20,001 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 190 GetRequests, 152 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 210 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=263, Invalid=1297, Unknown=0, NotChecked=0, Total=1560 [2021-11-23 03:30:20,002 INFO L933 BasicCegarLoop]: 35 mSDtfsCounter, 138 mSDsluCounter, 333 mSDsCounter, 0 mSdLazyCounter, 679 mSolverCounterSat, 164 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 139 SdHoareTripleChecker+Valid, 355 SdHoareTripleChecker+Invalid, 843 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 164 IncrementalHoareTripleChecker+Valid, 679 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-23 03:30:20,003 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [139 Valid, 355 Invalid, 843 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [164 Valid, 679 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-23 03:30:20,004 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2021-11-23 03:30:20,036 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 98. [2021-11-23 03:30:20,039 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 98 states, 64 states have (on average 1.171875) internal successors, (75), 66 states have internal predecessors, (75), 19 states have call successors, (19), 8 states have call predecessors, (19), 14 states have return successors, (50), 23 states have call predecessors, (50), 19 states have call successors, (50) [2021-11-23 03:30:20,043 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 144 transitions. [2021-11-23 03:30:20,043 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 144 transitions. Word has length 79 [2021-11-23 03:30:20,044 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:30:20,044 INFO L470 AbstractCegarLoop]: Abstraction has 98 states and 144 transitions. [2021-11-23 03:30:20,045 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 21 states have (on average 3.4285714285714284) internal successors, (72), 23 states have internal predecessors, (72), 18 states have call successors, (22), 1 states have call predecessors, (22), 9 states have return successors, (25), 10 states have call predecessors, (25), 18 states have call successors, (25) [2021-11-23 03:30:20,045 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 144 transitions. [2021-11-23 03:30:20,051 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2021-11-23 03:30:20,051 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:30:20,051 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 7, 6, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1] [2021-11-23 03:30:20,087 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-23 03:30:20,265 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:30:20,266 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:30:20,266 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:30:20,266 INFO L85 PathProgramCache]: Analyzing trace with hash -346616466, now seen corresponding path program 1 times [2021-11-23 03:30:20,266 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:30:20,266 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1736800223] [2021-11-23 03:30:20,266 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:30:20,267 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:30:20,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:30:20,371 INFO L134 CoverageAnalysis]: Checked inductivity of 424 backedges. 39 proven. 92 refuted. 0 times theorem prover too weak. 293 trivial. 0 not checked. [2021-11-23 03:30:20,372 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:30:20,372 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1736800223] [2021-11-23 03:30:20,372 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1736800223] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:30:20,372 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [619740766] [2021-11-23 03:30:20,372 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:30:20,373 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:30:20,373 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:30:20,374 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:30:20,393 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-23 03:30:20,455 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:30:20,456 INFO L263 TraceCheckSpWp]: Trace formula consists of 315 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-23 03:30:20,462 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:30:20,705 INFO L134 CoverageAnalysis]: Checked inductivity of 424 backedges. 29 proven. 172 refuted. 0 times theorem prover too weak. 223 trivial. 0 not checked. [2021-11-23 03:30:20,705 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:30:22,017 INFO L134 CoverageAnalysis]: Checked inductivity of 424 backedges. 29 proven. 186 refuted. 0 times theorem prover too weak. 209 trivial. 0 not checked. [2021-11-23 03:30:22,017 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [619740766] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:30:22,017 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1719894592] [2021-11-23 03:30:22,020 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2021-11-23 03:30:22,020 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:30:22,021 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 03:30:22,022 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 03:30:22,022 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 11, 15] total 20 [2021-11-23 03:30:22,022 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [642673799] [2021-11-23 03:30:22,022 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 03:30:22,023 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-23 03:30:22,023 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:30:22,024 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-23 03:30:22,024 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=316, Unknown=0, NotChecked=0, Total=380 [2021-11-23 03:30:22,025 INFO L87 Difference]: Start difference. First operand 98 states and 144 transitions. Second operand has 20 states, 17 states have (on average 4.117647058823529) internal successors, (70), 20 states have internal predecessors, (70), 17 states have call successors, (22), 1 states have call predecessors, (22), 8 states have return successors, (27), 7 states have call predecessors, (27), 17 states have call successors, (27) [2021-11-23 03:30:22,353 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:30:22,353 INFO L93 Difference]: Finished difference Result 191 states and 315 transitions. [2021-11-23 03:30:22,353 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-23 03:30:22,354 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 17 states have (on average 4.117647058823529) internal successors, (70), 20 states have internal predecessors, (70), 17 states have call successors, (22), 1 states have call predecessors, (22), 8 states have return successors, (27), 7 states have call predecessors, (27), 17 states have call successors, (27) Word has length 130 [2021-11-23 03:30:22,354 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:30:22,355 INFO L225 Difference]: With dead ends: 191 [2021-11-23 03:30:22,355 INFO L226 Difference]: Without dead ends: 103 [2021-11-23 03:30:22,357 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 274 GetRequests, 240 SyntacticMatches, 7 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 139 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=152, Invalid=660, Unknown=0, NotChecked=0, Total=812 [2021-11-23 03:30:22,357 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 86 mSDsluCounter, 177 mSDsCounter, 0 mSdLazyCounter, 283 mSolverCounterSat, 69 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 93 SdHoareTripleChecker+Valid, 183 SdHoareTripleChecker+Invalid, 352 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 69 IncrementalHoareTripleChecker+Valid, 283 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 03:30:22,358 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [93 Valid, 183 Invalid, 352 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [69 Valid, 283 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 03:30:22,358 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2021-11-23 03:30:22,379 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 100. [2021-11-23 03:30:22,379 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 100 states, 65 states have (on average 1.1692307692307693) internal successors, (76), 68 states have internal predecessors, (76), 19 states have call successors, (19), 8 states have call predecessors, (19), 15 states have return successors, (48), 23 states have call predecessors, (48), 19 states have call successors, (48) [2021-11-23 03:30:22,383 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 143 transitions. [2021-11-23 03:30:22,383 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 143 transitions. Word has length 130 [2021-11-23 03:30:22,383 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:30:22,383 INFO L470 AbstractCegarLoop]: Abstraction has 100 states and 143 transitions. [2021-11-23 03:30:22,384 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 17 states have (on average 4.117647058823529) internal successors, (70), 20 states have internal predecessors, (70), 17 states have call successors, (22), 1 states have call predecessors, (22), 8 states have return successors, (27), 7 states have call predecessors, (27), 17 states have call successors, (27) [2021-11-23 03:30:22,384 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 143 transitions. [2021-11-23 03:30:22,387 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2021-11-23 03:30:22,387 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:30:22,388 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 7, 7, 7, 6, 5, 5, 5, 5, 5, 5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:30:22,412 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-23 03:30:22,597 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2021-11-23 03:30:22,597 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:30:22,598 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:30:22,598 INFO L85 PathProgramCache]: Analyzing trace with hash 2089532945, now seen corresponding path program 2 times [2021-11-23 03:30:22,598 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:30:22,598 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [41436932] [2021-11-23 03:30:22,598 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:30:22,598 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:30:22,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:30:22,771 INFO L134 CoverageAnalysis]: Checked inductivity of 352 backedges. 37 proven. 111 refuted. 0 times theorem prover too weak. 204 trivial. 0 not checked. [2021-11-23 03:30:22,771 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:30:22,771 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [41436932] [2021-11-23 03:30:22,771 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [41436932] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:30:22,772 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [172673049] [2021-11-23 03:30:22,772 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 03:30:22,772 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:30:22,772 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:30:22,773 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:30:22,793 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-23 03:30:22,851 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-23 03:30:22,851 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:30:22,852 INFO L263 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 03:30:22,856 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:30:23,063 INFO L134 CoverageAnalysis]: Checked inductivity of 352 backedges. 77 proven. 20 refuted. 0 times theorem prover too weak. 255 trivial. 0 not checked. [2021-11-23 03:30:23,064 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:30:23,574 INFO L134 CoverageAnalysis]: Checked inductivity of 352 backedges. 77 proven. 22 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2021-11-23 03:30:23,575 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [172673049] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:30:23,575 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [486278641] [2021-11-23 03:30:23,577 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2021-11-23 03:30:23,577 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:30:23,578 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 03:30:23,579 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 03:30:23,579 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 8, 9] total 16 [2021-11-23 03:30:23,579 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2123933071] [2021-11-23 03:30:23,579 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 03:30:23,580 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 03:30:23,580 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:30:23,581 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 03:30:23,581 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=190, Unknown=0, NotChecked=0, Total=240 [2021-11-23 03:30:23,581 INFO L87 Difference]: Start difference. First operand 100 states and 143 transitions. Second operand has 16 states, 14 states have (on average 4.071428571428571) internal successors, (57), 16 states have internal predecessors, (57), 10 states have call successors, (17), 1 states have call predecessors, (17), 8 states have return successors, (21), 11 states have call predecessors, (21), 10 states have call successors, (21) [2021-11-23 03:30:23,811 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:30:23,811 INFO L93 Difference]: Finished difference Result 132 states and 213 transitions. [2021-11-23 03:30:23,812 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-23 03:30:23,812 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 14 states have (on average 4.071428571428571) internal successors, (57), 16 states have internal predecessors, (57), 10 states have call successors, (17), 1 states have call predecessors, (17), 8 states have return successors, (21), 11 states have call predecessors, (21), 10 states have call successors, (21) Word has length 118 [2021-11-23 03:30:23,813 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:30:23,815 INFO L225 Difference]: With dead ends: 132 [2021-11-23 03:30:23,815 INFO L226 Difference]: Without dead ends: 118 [2021-11-23 03:30:23,816 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 254 GetRequests, 233 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 65 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=107, Invalid=399, Unknown=0, NotChecked=0, Total=506 [2021-11-23 03:30:23,816 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 29 mSDsluCounter, 160 mSDsCounter, 0 mSdLazyCounter, 240 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 165 SdHoareTripleChecker+Invalid, 270 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 240 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 03:30:23,817 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [34 Valid, 165 Invalid, 270 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 240 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 03:30:23,817 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2021-11-23 03:30:23,829 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 108. [2021-11-23 03:30:23,829 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 108 states, 70 states have (on average 1.1571428571428573) internal successors, (81), 73 states have internal predecessors, (81), 20 states have call successors, (20), 8 states have call predecessors, (20), 17 states have return successors, (59), 26 states have call predecessors, (59), 20 states have call successors, (59) [2021-11-23 03:30:23,831 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 160 transitions. [2021-11-23 03:30:23,831 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 160 transitions. Word has length 118 [2021-11-23 03:30:23,831 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:30:23,832 INFO L470 AbstractCegarLoop]: Abstraction has 108 states and 160 transitions. [2021-11-23 03:30:23,832 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 14 states have (on average 4.071428571428571) internal successors, (57), 16 states have internal predecessors, (57), 10 states have call successors, (17), 1 states have call predecessors, (17), 8 states have return successors, (21), 11 states have call predecessors, (21), 10 states have call successors, (21) [2021-11-23 03:30:23,832 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 160 transitions. [2021-11-23 03:30:23,834 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 188 [2021-11-23 03:30:23,835 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:30:23,835 INFO L514 BasicCegarLoop]: trace histogram [14, 14, 13, 13, 12, 10, 7, 7, 7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 6, 6, 6, 3, 3, 2, 1, 1, 1, 1, 1, 1] [2021-11-23 03:30:23,867 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-23 03:30:24,049 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2021-11-23 03:30:24,049 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:30:24,050 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:30:24,050 INFO L85 PathProgramCache]: Analyzing trace with hash 1687293718, now seen corresponding path program 3 times [2021-11-23 03:30:24,050 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:30:24,050 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1406140127] [2021-11-23 03:30:24,050 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:30:24,050 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:30:24,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:30:24,196 INFO L134 CoverageAnalysis]: Checked inductivity of 931 backedges. 76 proven. 209 refuted. 0 times theorem prover too weak. 646 trivial. 0 not checked. [2021-11-23 03:30:24,196 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:30:24,196 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1406140127] [2021-11-23 03:30:24,196 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1406140127] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:30:24,197 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1058224218] [2021-11-23 03:30:24,197 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 03:30:24,197 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:30:24,197 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:30:24,198 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:30:24,224 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-23 03:30:24,296 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 03:30:24,296 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:30:24,297 INFO L263 TraceCheckSpWp]: Trace formula consists of 332 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 03:30:24,304 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:30:24,576 INFO L134 CoverageAnalysis]: Checked inductivity of 931 backedges. 423 proven. 19 refuted. 0 times theorem prover too weak. 489 trivial. 0 not checked. [2021-11-23 03:30:24,576 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:30:25,503 INFO L134 CoverageAnalysis]: Checked inductivity of 931 backedges. 74 proven. 251 refuted. 0 times theorem prover too weak. 606 trivial. 0 not checked. [2021-11-23 03:30:25,504 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1058224218] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:30:25,504 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [125572702] [2021-11-23 03:30:25,507 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2021-11-23 03:30:25,507 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:30:25,507 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 03:30:25,508 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 03:30:25,509 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 11] total 17 [2021-11-23 03:30:25,509 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [90200261] [2021-11-23 03:30:25,509 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 03:30:25,510 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-23 03:30:25,510 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:30:25,510 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-23 03:30:25,511 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=222, Unknown=0, NotChecked=0, Total=272 [2021-11-23 03:30:25,511 INFO L87 Difference]: Start difference. First operand 108 states and 160 transitions. Second operand has 17 states, 17 states have (on average 4.176470588235294) internal successors, (71), 17 states have internal predecessors, (71), 10 states have call successors, (20), 2 states have call predecessors, (20), 6 states have return successors, (23), 6 states have call predecessors, (23), 10 states have call successors, (23) [2021-11-23 03:30:25,694 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:30:25,694 INFO L93 Difference]: Finished difference Result 213 states and 337 transitions. [2021-11-23 03:30:25,694 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-23 03:30:25,695 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 4.176470588235294) internal successors, (71), 17 states have internal predecessors, (71), 10 states have call successors, (20), 2 states have call predecessors, (20), 6 states have return successors, (23), 6 states have call predecessors, (23), 10 states have call successors, (23) Word has length 187 [2021-11-23 03:30:25,695 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:30:25,696 INFO L225 Difference]: With dead ends: 213 [2021-11-23 03:30:25,697 INFO L226 Difference]: Without dead ends: 113 [2021-11-23 03:30:25,698 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 390 GetRequests, 366 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 93 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=115, Invalid=437, Unknown=0, NotChecked=0, Total=552 [2021-11-23 03:30:25,699 INFO L933 BasicCegarLoop]: 25 mSDtfsCounter, 43 mSDsluCounter, 165 mSDsCounter, 0 mSdLazyCounter, 206 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 181 SdHoareTripleChecker+Invalid, 235 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 206 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:30:25,699 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [44 Valid, 181 Invalid, 235 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 206 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:30:25,700 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2021-11-23 03:30:25,709 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 113. [2021-11-23 03:30:25,710 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 113 states, 74 states have (on average 1.1216216216216217) internal successors, (83), 76 states have internal predecessors, (83), 20 states have call successors, (20), 9 states have call predecessors, (20), 18 states have return successors, (59), 27 states have call predecessors, (59), 20 states have call successors, (59) [2021-11-23 03:30:25,711 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 162 transitions. [2021-11-23 03:30:25,712 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 162 transitions. Word has length 187 [2021-11-23 03:30:25,712 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:30:25,712 INFO L470 AbstractCegarLoop]: Abstraction has 113 states and 162 transitions. [2021-11-23 03:30:25,713 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 4.176470588235294) internal successors, (71), 17 states have internal predecessors, (71), 10 states have call successors, (20), 2 states have call predecessors, (20), 6 states have return successors, (23), 6 states have call predecessors, (23), 10 states have call successors, (23) [2021-11-23 03:30:25,713 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 162 transitions. [2021-11-23 03:30:25,716 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 189 [2021-11-23 03:30:25,716 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:30:25,716 INFO L514 BasicCegarLoop]: trace histogram [14, 14, 13, 13, 13, 10, 7, 7, 7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 6, 6, 6, 4, 4, 1, 1, 1, 1, 1, 1] [2021-11-23 03:30:25,745 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-23 03:30:25,937 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:30:25,938 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:30:25,938 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:30:25,938 INFO L85 PathProgramCache]: Analyzing trace with hash 317371732, now seen corresponding path program 1 times [2021-11-23 03:30:25,938 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:30:25,938 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [236893702] [2021-11-23 03:30:25,938 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:30:25,939 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:30:25,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:30:26,060 INFO L134 CoverageAnalysis]: Checked inductivity of 943 backedges. 45 proven. 299 refuted. 0 times theorem prover too weak. 599 trivial. 0 not checked. [2021-11-23 03:30:26,060 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:30:26,060 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [236893702] [2021-11-23 03:30:26,060 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [236893702] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:30:26,061 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1709091617] [2021-11-23 03:30:26,061 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:30:26,061 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:30:26,061 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:30:26,062 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:30:26,074 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-23 03:30:26,203 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:30:26,205 INFO L263 TraceCheckSpWp]: Trace formula consists of 443 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-23 03:30:26,209 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:30:26,463 INFO L134 CoverageAnalysis]: Checked inductivity of 943 backedges. 45 proven. 299 refuted. 0 times theorem prover too weak. 599 trivial. 0 not checked. [2021-11-23 03:30:26,464 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:30:27,812 INFO L134 CoverageAnalysis]: Checked inductivity of 943 backedges. 45 proven. 315 refuted. 0 times theorem prover too weak. 583 trivial. 0 not checked. [2021-11-23 03:30:27,812 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1709091617] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:30:27,813 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1275171085] [2021-11-23 03:30:27,819 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2021-11-23 03:30:27,819 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:30:27,820 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 03:30:27,822 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 03:30:27,822 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 15] total 18 [2021-11-23 03:30:27,823 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1007167711] [2021-11-23 03:30:27,823 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 03:30:27,825 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-23 03:30:27,826 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:30:27,826 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-23 03:30:27,827 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2021-11-23 03:30:27,827 INFO L87 Difference]: Start difference. First operand 113 states and 162 transitions. Second operand has 18 states, 16 states have (on average 3.8125) internal successors, (61), 18 states have internal predecessors, (61), 15 states have call successors, (18), 1 states have call predecessors, (18), 7 states have return successors, (21), 7 states have call predecessors, (21), 15 states have call successors, (21) [2021-11-23 03:30:28,016 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:30:28,017 INFO L93 Difference]: Finished difference Result 142 states and 227 transitions. [2021-11-23 03:30:28,017 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-23 03:30:28,017 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 16 states have (on average 3.8125) internal successors, (61), 18 states have internal predecessors, (61), 15 states have call successors, (18), 1 states have call predecessors, (18), 7 states have return successors, (21), 7 states have call predecessors, (21), 15 states have call successors, (21) Word has length 188 [2021-11-23 03:30:28,018 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:30:28,020 INFO L225 Difference]: With dead ends: 142 [2021-11-23 03:30:28,020 INFO L226 Difference]: Without dead ends: 128 [2021-11-23 03:30:28,020 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 396 GetRequests, 374 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 58 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=112, Invalid=440, Unknown=0, NotChecked=0, Total=552 [2021-11-23 03:30:28,021 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 68 mSDsluCounter, 127 mSDsCounter, 0 mSdLazyCounter, 197 mSolverCounterSat, 52 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 82 SdHoareTripleChecker+Valid, 135 SdHoareTripleChecker+Invalid, 249 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 52 IncrementalHoareTripleChecker+Valid, 197 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:30:28,021 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [82 Valid, 135 Invalid, 249 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [52 Valid, 197 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:30:28,022 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2021-11-23 03:30:28,032 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 107. [2021-11-23 03:30:28,032 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 107 states, 70 states have (on average 1.1285714285714286) internal successors, (79), 72 states have internal predecessors, (79), 20 states have call successors, (20), 9 states have call predecessors, (20), 16 states have return successors, (49), 25 states have call predecessors, (49), 20 states have call successors, (49) [2021-11-23 03:30:28,034 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 148 transitions. [2021-11-23 03:30:28,034 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 148 transitions. Word has length 188 [2021-11-23 03:30:28,035 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:30:28,035 INFO L470 AbstractCegarLoop]: Abstraction has 107 states and 148 transitions. [2021-11-23 03:30:28,035 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 16 states have (on average 3.8125) internal successors, (61), 18 states have internal predecessors, (61), 15 states have call successors, (18), 1 states have call predecessors, (18), 7 states have return successors, (21), 7 states have call predecessors, (21), 15 states have call successors, (21) [2021-11-23 03:30:28,035 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 148 transitions. [2021-11-23 03:30:28,039 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 240 [2021-11-23 03:30:28,039 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:30:28,039 INFO L514 BasicCegarLoop]: trace histogram [18, 18, 17, 17, 14, 12, 9, 9, 9, 9, 9, 9, 9, 8, 8, 8, 8, 8, 8, 8, 6, 5, 4, 3, 1, 1, 1, 1, 1, 1] [2021-11-23 03:30:28,067 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-23 03:30:28,253 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:30:28,254 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:30:28,254 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:30:28,254 INFO L85 PathProgramCache]: Analyzing trace with hash 384777542, now seen corresponding path program 4 times [2021-11-23 03:30:28,254 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:30:28,254 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1848224560] [2021-11-23 03:30:28,254 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:30:28,254 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:30:28,286 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:30:28,478 INFO L134 CoverageAnalysis]: Checked inductivity of 1569 backedges. 279 proven. 371 refuted. 0 times theorem prover too weak. 919 trivial. 0 not checked. [2021-11-23 03:30:28,478 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:30:28,478 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1848224560] [2021-11-23 03:30:28,479 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1848224560] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:30:28,479 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1558543964] [2021-11-23 03:30:28,479 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 03:30:28,479 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:30:28,479 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:30:28,482 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:30:28,500 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-23 03:30:28,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:30:28,641 INFO L263 TraceCheckSpWp]: Trace formula consists of 557 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-23 03:30:28,646 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:30:29,078 INFO L134 CoverageAnalysis]: Checked inductivity of 1569 backedges. 85 proven. 439 refuted. 0 times theorem prover too weak. 1045 trivial. 0 not checked. [2021-11-23 03:30:29,078 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:30:31,018 INFO L134 CoverageAnalysis]: Checked inductivity of 1569 backedges. 85 proven. 463 refuted. 0 times theorem prover too weak. 1021 trivial. 0 not checked. [2021-11-23 03:30:31,018 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1558543964] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:30:31,018 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [815890030] [2021-11-23 03:30:31,025 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2021-11-23 03:30:31,025 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:30:31,025 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 03:30:31,026 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 03:30:31,026 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 12, 17] total 32 [2021-11-23 03:30:31,026 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1973652980] [2021-11-23 03:30:31,026 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 03:30:31,027 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-23 03:30:31,027 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:30:31,027 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-23 03:30:31,028 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=879, Unknown=0, NotChecked=0, Total=992 [2021-11-23 03:30:31,028 INFO L87 Difference]: Start difference. First operand 107 states and 148 transitions. Second operand has 32 states, 30 states have (on average 3.3) internal successors, (99), 32 states have internal predecessors, (99), 25 states have call successors, (31), 1 states have call predecessors, (31), 15 states have return successors, (39), 16 states have call predecessors, (39), 25 states have call successors, (39) [2021-11-23 03:30:32,348 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:30:32,349 INFO L93 Difference]: Finished difference Result 300 states and 568 transitions. [2021-11-23 03:30:32,349 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-11-23 03:30:32,350 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 30 states have (on average 3.3) internal successors, (99), 32 states have internal predecessors, (99), 25 states have call successors, (31), 1 states have call predecessors, (31), 15 states have return successors, (39), 16 states have call predecessors, (39), 25 states have call successors, (39) Word has length 239 [2021-11-23 03:30:32,351 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:30:32,358 INFO L225 Difference]: With dead ends: 300 [2021-11-23 03:30:32,359 INFO L226 Difference]: Without dead ends: 182 [2021-11-23 03:30:32,362 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 530 GetRequests, 467 SyntacticMatches, 0 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 924 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=590, Invalid=3570, Unknown=0, NotChecked=0, Total=4160 [2021-11-23 03:30:32,364 INFO L933 BasicCegarLoop]: 44 mSDtfsCounter, 187 mSDsluCounter, 616 mSDsCounter, 0 mSdLazyCounter, 1343 mSolverCounterSat, 351 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 188 SdHoareTripleChecker+Valid, 642 SdHoareTripleChecker+Invalid, 1694 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 351 IncrementalHoareTripleChecker+Valid, 1343 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-23 03:30:32,364 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [188 Valid, 642 Invalid, 1694 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [351 Valid, 1343 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-23 03:30:32,365 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 182 states. [2021-11-23 03:30:32,388 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 182 to 148. [2021-11-23 03:30:32,388 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 148 states, 101 states have (on average 1.099009900990099) internal successors, (111), 100 states have internal predecessors, (111), 28 states have call successors, (28), 17 states have call predecessors, (28), 18 states have return successors, (68), 30 states have call predecessors, (68), 28 states have call successors, (68) [2021-11-23 03:30:32,395 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 148 states to 148 states and 207 transitions. [2021-11-23 03:30:32,396 INFO L78 Accepts]: Start accepts. Automaton has 148 states and 207 transitions. Word has length 239 [2021-11-23 03:30:32,397 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:30:32,398 INFO L470 AbstractCegarLoop]: Abstraction has 148 states and 207 transitions. [2021-11-23 03:30:32,398 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 30 states have (on average 3.3) internal successors, (99), 32 states have internal predecessors, (99), 25 states have call successors, (31), 1 states have call predecessors, (31), 15 states have return successors, (39), 16 states have call predecessors, (39), 25 states have call successors, (39) [2021-11-23 03:30:32,398 INFO L276 IsEmpty]: Start isEmpty. Operand 148 states and 207 transitions. [2021-11-23 03:30:32,428 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 811 [2021-11-23 03:30:32,428 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:30:32,429 INFO L514 BasicCegarLoop]: trace histogram [66, 66, 54, 53, 53, 39, 33, 33, 33, 33, 33, 33, 33, 28, 26, 26, 26, 26, 26, 26, 26, 14, 12, 6, 1, 1, 1, 1, 1, 1] [2021-11-23 03:30:32,465 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-23 03:30:32,657 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-11-23 03:30:32,657 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:30:32,658 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:30:32,658 INFO L85 PathProgramCache]: Analyzing trace with hash 480742356, now seen corresponding path program 5 times [2021-11-23 03:30:32,658 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:30:32,658 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [427790575] [2021-11-23 03:30:32,659 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:30:32,659 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:30:32,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:30:33,095 INFO L134 CoverageAnalysis]: Checked inductivity of 19676 backedges. 279 proven. 1809 refuted. 0 times theorem prover too weak. 17588 trivial. 0 not checked. [2021-11-23 03:30:33,096 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:30:33,096 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [427790575] [2021-11-23 03:30:33,096 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [427790575] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:30:33,096 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1928352950] [2021-11-23 03:30:33,096 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 03:30:33,097 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:30:33,097 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:30:33,098 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:30:33,118 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-23 03:30:33,244 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-23 03:30:33,244 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:30:33,246 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 03:30:33,259 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:30:34,303 INFO L134 CoverageAnalysis]: Checked inductivity of 19676 backedges. 1238 proven. 4 refuted. 0 times theorem prover too weak. 18434 trivial. 0 not checked. [2021-11-23 03:30:34,304 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:30:37,098 INFO L134 CoverageAnalysis]: Checked inductivity of 19676 backedges. 1238 proven. 4 refuted. 0 times theorem prover too weak. 18434 trivial. 0 not checked. [2021-11-23 03:30:37,101 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1928352950] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:30:37,101 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1916869664] [2021-11-23 03:30:37,104 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2021-11-23 03:30:37,105 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:30:37,105 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 03:30:37,107 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 03:30:37,107 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 7, 7] total 18 [2021-11-23 03:30:37,108 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1356997932] [2021-11-23 03:30:37,108 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 03:30:37,110 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-23 03:30:37,114 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:30:37,117 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-23 03:30:37,117 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2021-11-23 03:30:37,118 INFO L87 Difference]: Start difference. First operand 148 states and 207 transitions. Second operand has 18 states, 17 states have (on average 3.7058823529411766) internal successors, (63), 18 states have internal predecessors, (63), 10 states have call successors, (15), 1 states have call predecessors, (15), 11 states have return successors, (22), 10 states have call predecessors, (22), 10 states have call successors, (22) [2021-11-23 03:30:37,539 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:30:37,539 INFO L93 Difference]: Finished difference Result 351 states and 610 transitions. [2021-11-23 03:30:37,539 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-23 03:30:37,540 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 17 states have (on average 3.7058823529411766) internal successors, (63), 18 states have internal predecessors, (63), 10 states have call successors, (15), 1 states have call predecessors, (15), 11 states have return successors, (22), 10 states have call predecessors, (22), 10 states have call successors, (22) Word has length 810 [2021-11-23 03:30:37,540 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:30:37,543 INFO L225 Difference]: With dead ends: 351 [2021-11-23 03:30:37,544 INFO L226 Difference]: Without dead ends: 202 [2021-11-23 03:30:37,546 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1647 GetRequests, 1617 SyntacticMatches, 2 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 121 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=167, Invalid=703, Unknown=0, NotChecked=0, Total=870 [2021-11-23 03:30:37,546 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 98 mSDsluCounter, 154 mSDsCounter, 0 mSdLazyCounter, 342 mSolverCounterSat, 84 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 106 SdHoareTripleChecker+Valid, 161 SdHoareTripleChecker+Invalid, 426 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 84 IncrementalHoareTripleChecker+Valid, 342 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 03:30:37,547 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [106 Valid, 161 Invalid, 426 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [84 Valid, 342 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 03:30:37,547 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 202 states. [2021-11-23 03:30:37,563 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 202 to 182. [2021-11-23 03:30:37,564 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 182 states, 123 states have (on average 1.0975609756097562) internal successors, (135), 121 states have internal predecessors, (135), 36 states have call successors, (36), 20 states have call predecessors, (36), 22 states have return successors, (123), 40 states have call predecessors, (123), 36 states have call successors, (123) [2021-11-23 03:30:37,567 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 182 states to 182 states and 294 transitions. [2021-11-23 03:30:37,567 INFO L78 Accepts]: Start accepts. Automaton has 182 states and 294 transitions. Word has length 810 [2021-11-23 03:30:37,568 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:30:37,568 INFO L470 AbstractCegarLoop]: Abstraction has 182 states and 294 transitions. [2021-11-23 03:30:37,568 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 17 states have (on average 3.7058823529411766) internal successors, (63), 18 states have internal predecessors, (63), 10 states have call successors, (15), 1 states have call predecessors, (15), 11 states have return successors, (22), 10 states have call predecessors, (22), 10 states have call successors, (22) [2021-11-23 03:30:37,568 INFO L276 IsEmpty]: Start isEmpty. Operand 182 states and 294 transitions. [2021-11-23 03:30:37,581 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 484 [2021-11-23 03:30:37,581 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:30:37,581 INFO L514 BasicCegarLoop]: trace histogram [36, 36, 35, 35, 28, 26, 18, 18, 18, 18, 18, 18, 18, 17, 17, 17, 17, 17, 17, 17, 11, 9, 8, 8, 1, 1, 1, 1, 1, 1] [2021-11-23 03:30:37,620 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-23 03:30:37,801 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-11-23 03:30:37,801 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:30:37,801 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:30:37,802 INFO L85 PathProgramCache]: Analyzing trace with hash -1209979920, now seen corresponding path program 6 times [2021-11-23 03:30:37,802 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:30:37,802 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [680691334] [2021-11-23 03:30:37,802 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:30:37,802 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:30:37,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:30:38,036 INFO L134 CoverageAnalysis]: Checked inductivity of 6759 backedges. 198 proven. 1185 refuted. 0 times theorem prover too weak. 5376 trivial. 0 not checked. [2021-11-23 03:30:38,037 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:30:38,037 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [680691334] [2021-11-23 03:30:38,037 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [680691334] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:30:38,037 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [475253538] [2021-11-23 03:30:38,038 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 03:30:38,038 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:30:38,038 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:30:38,042 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:30:38,065 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-23 03:30:38,255 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 03:30:38,255 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:30:38,258 INFO L263 TraceCheckSpWp]: Trace formula consists of 858 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-23 03:30:38,266 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:30:39,010 INFO L134 CoverageAnalysis]: Checked inductivity of 6759 backedges. 3599 proven. 360 refuted. 0 times theorem prover too weak. 2800 trivial. 0 not checked. [2021-11-23 03:30:39,011 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:30:42,315 INFO L134 CoverageAnalysis]: Checked inductivity of 6759 backedges. 414 proven. 1566 refuted. 0 times theorem prover too weak. 4779 trivial. 0 not checked. [2021-11-23 03:30:42,315 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [475253538] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:30:42,315 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1103791580] [2021-11-23 03:30:42,317 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2021-11-23 03:30:42,318 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:30:42,318 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 03:30:42,319 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 03:30:42,320 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 17, 23] total 31 [2021-11-23 03:30:42,320 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1806534751] [2021-11-23 03:30:42,320 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 03:30:42,321 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2021-11-23 03:30:42,322 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:30:42,322 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-11-23 03:30:42,323 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=827, Unknown=0, NotChecked=0, Total=930 [2021-11-23 03:30:42,323 INFO L87 Difference]: Start difference. First operand 182 states and 294 transitions. Second operand has 31 states, 30 states have (on average 3.9) internal successors, (117), 31 states have internal predecessors, (117), 27 states have call successors, (36), 2 states have call predecessors, (36), 15 states have return successors, (46), 14 states have call predecessors, (46), 27 states have call successors, (46) [2021-11-23 03:30:43,535 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:30:43,535 INFO L93 Difference]: Finished difference Result 432 states and 860 transitions. [2021-11-23 03:30:43,536 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2021-11-23 03:30:43,536 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 30 states have (on average 3.9) internal successors, (117), 31 states have internal predecessors, (117), 27 states have call successors, (36), 2 states have call predecessors, (36), 15 states have return successors, (46), 14 states have call predecessors, (46), 27 states have call successors, (46) Word has length 483 [2021-11-23 03:30:43,537 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:30:43,541 INFO L225 Difference]: With dead ends: 432 [2021-11-23 03:30:43,541 INFO L226 Difference]: Without dead ends: 246 [2021-11-23 03:30:43,546 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1015 GetRequests, 952 SyntacticMatches, 2 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 753 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=607, Invalid=3299, Unknown=0, NotChecked=0, Total=3906 [2021-11-23 03:30:43,547 INFO L933 BasicCegarLoop]: 29 mSDtfsCounter, 257 mSDsluCounter, 367 mSDsCounter, 0 mSdLazyCounter, 920 mSolverCounterSat, 306 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 258 SdHoareTripleChecker+Valid, 379 SdHoareTripleChecker+Invalid, 1226 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 306 IncrementalHoareTripleChecker+Valid, 920 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-23 03:30:43,547 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [258 Valid, 379 Invalid, 1226 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [306 Valid, 920 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-23 03:30:43,548 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 246 states. [2021-11-23 03:30:43,566 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 246 to 185. [2021-11-23 03:30:43,566 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 185 states, 127 states have (on average 1.1023622047244095) internal successors, (140), 126 states have internal predecessors, (140), 37 states have call successors, (37), 24 states have call predecessors, (37), 20 states have return successors, (87), 34 states have call predecessors, (87), 37 states have call successors, (87) [2021-11-23 03:30:43,571 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 185 states to 185 states and 264 transitions. [2021-11-23 03:30:43,571 INFO L78 Accepts]: Start accepts. Automaton has 185 states and 264 transitions. Word has length 483 [2021-11-23 03:30:43,572 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:30:43,572 INFO L470 AbstractCegarLoop]: Abstraction has 185 states and 264 transitions. [2021-11-23 03:30:43,572 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 30 states have (on average 3.9) internal successors, (117), 31 states have internal predecessors, (117), 27 states have call successors, (36), 2 states have call predecessors, (36), 15 states have return successors, (46), 14 states have call predecessors, (46), 27 states have call successors, (46) [2021-11-23 03:30:43,572 INFO L276 IsEmpty]: Start isEmpty. Operand 185 states and 264 transitions. [2021-11-23 03:30:43,579 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 729 [2021-11-23 03:30:43,579 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:30:43,579 INFO L514 BasicCegarLoop]: trace histogram [55, 55, 52, 52, 42, 41, 27, 27, 27, 27, 27, 27, 27, 26, 26, 26, 26, 26, 26, 26, 15, 15, 14, 10, 1, 1, 1, 1, 1, 1] [2021-11-23 03:30:43,616 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-23 03:30:43,805 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:30:43,805 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:30:43,806 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:30:43,806 INFO L85 PathProgramCache]: Analyzing trace with hash 1983526510, now seen corresponding path program 7 times [2021-11-23 03:30:43,806 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:30:43,806 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1639751832] [2021-11-23 03:30:43,806 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:30:43,806 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:30:43,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:30:44,136 INFO L134 CoverageAnalysis]: Checked inductivity of 15629 backedges. 383 proven. 1501 refuted. 0 times theorem prover too weak. 13745 trivial. 0 not checked. [2021-11-23 03:30:44,136 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:30:44,136 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1639751832] [2021-11-23 03:30:44,136 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1639751832] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:30:44,136 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2102498031] [2021-11-23 03:30:44,137 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 03:30:44,137 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:30:44,137 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:30:44,142 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:30:44,159 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-23 03:30:44,490 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:30:44,496 INFO L263 TraceCheckSpWp]: Trace formula consists of 1643 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-23 03:30:44,507 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:30:45,472 INFO L134 CoverageAnalysis]: Checked inductivity of 15629 backedges. 320 proven. 2126 refuted. 0 times theorem prover too weak. 13183 trivial. 0 not checked. [2021-11-23 03:30:45,472 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:30:49,565 INFO L134 CoverageAnalysis]: Checked inductivity of 15629 backedges. 320 proven. 2170 refuted. 0 times theorem prover too weak. 13139 trivial. 0 not checked. [2021-11-23 03:30:49,565 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2102498031] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:30:49,565 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [395350535] [2021-11-23 03:30:49,567 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2021-11-23 03:30:49,568 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:30:49,568 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 03:30:49,568 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 03:30:49,569 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 14, 21] total 30 [2021-11-23 03:30:49,569 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [815710718] [2021-11-23 03:30:49,569 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 03:30:49,571 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2021-11-23 03:30:49,571 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:30:49,572 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-11-23 03:30:49,572 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=157, Invalid=713, Unknown=0, NotChecked=0, Total=870 [2021-11-23 03:30:49,572 INFO L87 Difference]: Start difference. First operand 185 states and 264 transitions. Second operand has 30 states, 28 states have (on average 3.5) internal successors, (98), 30 states have internal predecessors, (98), 25 states have call successors, (30), 1 states have call predecessors, (30), 16 states have return successors, (43), 17 states have call predecessors, (43), 25 states have call successors, (43) [2021-11-23 03:30:50,123 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:30:50,123 INFO L93 Difference]: Finished difference Result 293 states and 583 transitions. [2021-11-23 03:30:50,123 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-11-23 03:30:50,124 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 28 states have (on average 3.5) internal successors, (98), 30 states have internal predecessors, (98), 25 states have call successors, (30), 1 states have call predecessors, (30), 16 states have return successors, (43), 17 states have call predecessors, (43), 25 states have call successors, (43) Word has length 728 [2021-11-23 03:30:50,126 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:30:50,135 INFO L225 Difference]: With dead ends: 293 [2021-11-23 03:30:50,135 INFO L226 Difference]: Without dead ends: 261 [2021-11-23 03:30:50,139 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1486 GetRequests, 1443 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 465 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=388, Invalid=1592, Unknown=0, NotChecked=0, Total=1980 [2021-11-23 03:30:50,140 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 155 mSDsluCounter, 187 mSDsCounter, 0 mSdLazyCounter, 428 mSolverCounterSat, 227 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 166 SdHoareTripleChecker+Valid, 192 SdHoareTripleChecker+Invalid, 655 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 227 IncrementalHoareTripleChecker+Valid, 428 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 03:30:50,141 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [166 Valid, 192 Invalid, 655 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [227 Valid, 428 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-23 03:30:50,142 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 261 states. [2021-11-23 03:30:50,169 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 261 to 246. [2021-11-23 03:30:50,170 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 246 states, 164 states have (on average 1.079268292682927) internal successors, (177), 163 states have internal predecessors, (177), 48 states have call successors, (48), 24 states have call predecessors, (48), 33 states have return successors, (202), 58 states have call predecessors, (202), 48 states have call successors, (202) [2021-11-23 03:30:50,174 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 246 states to 246 states and 427 transitions. [2021-11-23 03:30:50,175 INFO L78 Accepts]: Start accepts. Automaton has 246 states and 427 transitions. Word has length 728 [2021-11-23 03:30:50,176 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:30:50,176 INFO L470 AbstractCegarLoop]: Abstraction has 246 states and 427 transitions. [2021-11-23 03:30:50,176 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 28 states have (on average 3.5) internal successors, (98), 30 states have internal predecessors, (98), 25 states have call successors, (30), 1 states have call predecessors, (30), 16 states have return successors, (43), 17 states have call predecessors, (43), 25 states have call successors, (43) [2021-11-23 03:30:50,177 INFO L276 IsEmpty]: Start isEmpty. Operand 246 states and 427 transitions. [2021-11-23 03:30:50,199 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1603 [2021-11-23 03:30:50,199 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:30:50,200 INFO L514 BasicCegarLoop]: trace histogram [119, 119, 116, 116, 96, 93, 59, 59, 59, 59, 59, 59, 59, 58, 58, 58, 58, 58, 58, 58, 38, 34, 23, 23, 1, 1, 1, 1, 1, 1] [2021-11-23 03:30:50,235 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-23 03:30:50,413 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-11-23 03:30:50,414 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:30:50,414 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:30:50,414 INFO L85 PathProgramCache]: Analyzing trace with hash 1799428786, now seen corresponding path program 8 times [2021-11-23 03:30:50,414 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:30:50,415 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1158675043] [2021-11-23 03:30:50,415 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:30:50,415 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:30:50,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:30:51,483 INFO L134 CoverageAnalysis]: Checked inductivity of 77058 backedges. 3421 proven. 3926 refuted. 0 times theorem prover too weak. 69711 trivial. 0 not checked. [2021-11-23 03:30:51,484 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:30:51,484 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1158675043] [2021-11-23 03:30:51,484 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1158675043] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:30:51,484 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [705245169] [2021-11-23 03:30:51,484 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 03:30:51,485 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:30:51,485 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:30:51,486 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:30:51,511 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-23 03:30:51,779 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2021-11-23 03:30:51,779 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:30:51,782 INFO L263 TraceCheckSpWp]: Trace formula consists of 380 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-23 03:30:51,854 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:30:53,608 INFO L134 CoverageAnalysis]: Checked inductivity of 77058 backedges. 4420 proven. 78 refuted. 0 times theorem prover too weak. 72560 trivial. 0 not checked. [2021-11-23 03:30:53,608 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:30:59,197 INFO L134 CoverageAnalysis]: Checked inductivity of 77058 backedges. 4420 proven. 83 refuted. 0 times theorem prover too weak. 72555 trivial. 0 not checked. [2021-11-23 03:30:59,197 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [705245169] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:30:59,197 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [267510228] [2021-11-23 03:30:59,200 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2021-11-23 03:30:59,200 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:30:59,200 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 03:30:59,201 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 03:30:59,202 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 13, 15] total 30 [2021-11-23 03:30:59,202 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1147052419] [2021-11-23 03:30:59,203 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 03:30:59,206 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2021-11-23 03:30:59,206 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:30:59,206 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-11-23 03:30:59,207 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=757, Unknown=0, NotChecked=0, Total=870 [2021-11-23 03:30:59,207 INFO L87 Difference]: Start difference. First operand 246 states and 427 transitions. Second operand has 30 states, 30 states have (on average 3.2666666666666666) internal successors, (98), 30 states have internal predecessors, (98), 18 states have call successors, (29), 1 states have call predecessors, (29), 15 states have return successors, (40), 22 states have call predecessors, (40), 18 states have call successors, (40) [2021-11-23 03:31:00,380 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:31:00,380 INFO L93 Difference]: Finished difference Result 602 states and 1262 transitions. [2021-11-23 03:31:00,380 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-11-23 03:31:00,381 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 3.2666666666666666) internal successors, (98), 30 states have internal predecessors, (98), 18 states have call successors, (29), 1 states have call predecessors, (29), 15 states have return successors, (40), 22 states have call predecessors, (40), 18 states have call successors, (40) Word has length 1602 [2021-11-23 03:31:00,382 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:31:00,389 INFO L225 Difference]: With dead ends: 602 [2021-11-23 03:31:00,389 INFO L226 Difference]: Without dead ends: 357 [2021-11-23 03:31:00,396 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3259 GetRequests, 3199 SyntacticMatches, 2 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 816 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=538, Invalid=3002, Unknown=0, NotChecked=0, Total=3540 [2021-11-23 03:31:00,396 INFO L933 BasicCegarLoop]: 57 mSDtfsCounter, 142 mSDsluCounter, 427 mSDsCounter, 0 mSdLazyCounter, 1004 mSolverCounterSat, 204 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 142 SdHoareTripleChecker+Valid, 473 SdHoareTripleChecker+Invalid, 1208 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 204 IncrementalHoareTripleChecker+Valid, 1004 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-23 03:31:00,397 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [142 Valid, 473 Invalid, 1208 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [204 Valid, 1004 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-23 03:31:00,398 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 357 states. [2021-11-23 03:31:00,426 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 357 to 289. [2021-11-23 03:31:00,427 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 289 states, 194 states have (on average 1.041237113402062) internal successors, (202), 191 states have internal predecessors, (202), 55 states have call successors, (55), 29 states have call predecessors, (55), 39 states have return successors, (269), 68 states have call predecessors, (269), 55 states have call successors, (269) [2021-11-23 03:31:00,432 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 289 states to 289 states and 526 transitions. [2021-11-23 03:31:00,433 INFO L78 Accepts]: Start accepts. Automaton has 289 states and 526 transitions. Word has length 1602 [2021-11-23 03:31:00,434 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:31:00,434 INFO L470 AbstractCegarLoop]: Abstraction has 289 states and 526 transitions. [2021-11-23 03:31:00,435 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 30 states have (on average 3.2666666666666666) internal successors, (98), 30 states have internal predecessors, (98), 18 states have call successors, (29), 1 states have call predecessors, (29), 15 states have return successors, (40), 22 states have call predecessors, (40), 18 states have call successors, (40) [2021-11-23 03:31:00,435 INFO L276 IsEmpty]: Start isEmpty. Operand 289 states and 526 transitions. [2021-11-23 03:31:00,461 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1719 [2021-11-23 03:31:00,461 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:31:00,462 INFO L514 BasicCegarLoop]: trace histogram [126, 126, 125, 125, 109, 100, 63, 63, 63, 63, 63, 63, 63, 62, 62, 62, 62, 62, 62, 62, 46, 38, 26, 16, 1, 1, 1, 1, 1, 1] [2021-11-23 03:31:00,498 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-23 03:31:00,689 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-11-23 03:31:00,689 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:31:00,690 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:31:00,690 INFO L85 PathProgramCache]: Analyzing trace with hash -105818006, now seen corresponding path program 9 times [2021-11-23 03:31:00,690 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:31:00,690 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [933565346] [2021-11-23 03:31:00,690 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:31:00,691 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:31:01,233 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:31:01,737 INFO L134 CoverageAnalysis]: Checked inductivity of 88712 backedges. 1387 proven. 4721 refuted. 0 times theorem prover too weak. 82604 trivial. 0 not checked. [2021-11-23 03:31:01,737 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:31:01,737 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [933565346] [2021-11-23 03:31:01,737 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [933565346] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:31:01,737 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2065669114] [2021-11-23 03:31:01,738 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 03:31:01,738 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:31:01,738 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:31:01,739 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:31:01,758 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-23 03:31:02,244 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 03:31:02,245 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:31:02,253 INFO L263 TraceCheckSpWp]: Trace formula consists of 3058 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-23 03:31:02,277 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:31:04,646 INFO L134 CoverageAnalysis]: Checked inductivity of 88712 backedges. 17555 proven. 245 refuted. 0 times theorem prover too weak. 70912 trivial. 0 not checked. [2021-11-23 03:31:04,646 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:31:11,367 INFO L134 CoverageAnalysis]: Checked inductivity of 88712 backedges. 1113 proven. 6552 refuted. 0 times theorem prover too weak. 81047 trivial. 0 not checked. [2021-11-23 03:31:11,368 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2065669114] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:31:11,368 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1776994287] [2021-11-23 03:31:11,371 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2021-11-23 03:31:11,371 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:31:11,371 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 03:31:11,372 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 03:31:11,374 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 15, 19] total 28 [2021-11-23 03:31:11,374 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [219502518] [2021-11-23 03:31:11,374 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 03:31:11,378 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2021-11-23 03:31:11,378 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:31:11,378 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-11-23 03:31:11,379 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=665, Unknown=0, NotChecked=0, Total=756 [2021-11-23 03:31:11,379 INFO L87 Difference]: Start difference. First operand 289 states and 526 transitions. Second operand has 28 states, 27 states have (on average 4.074074074074074) internal successors, (110), 28 states have internal predecessors, (110), 21 states have call successors, (35), 2 states have call predecessors, (35), 14 states have return successors, (44), 18 states have call predecessors, (44), 21 states have call successors, (44) [2021-11-23 03:31:12,430 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:31:12,430 INFO L93 Difference]: Finished difference Result 743 states and 1916 transitions. [2021-11-23 03:31:12,430 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-11-23 03:31:12,431 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 27 states have (on average 4.074074074074074) internal successors, (110), 28 states have internal predecessors, (110), 21 states have call successors, (35), 2 states have call predecessors, (35), 14 states have return successors, (44), 18 states have call predecessors, (44), 21 states have call successors, (44) Word has length 1718 [2021-11-23 03:31:12,431 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:31:12,441 INFO L225 Difference]: With dead ends: 743 [2021-11-23 03:31:12,441 INFO L226 Difference]: Without dead ends: 434 [2021-11-23 03:31:12,449 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3484 GetRequests, 3427 SyntacticMatches, 2 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 558 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=520, Invalid=2672, Unknown=0, NotChecked=0, Total=3192 [2021-11-23 03:31:12,449 INFO L933 BasicCegarLoop]: 26 mSDtfsCounter, 220 mSDsluCounter, 288 mSDsCounter, 0 mSdLazyCounter, 787 mSolverCounterSat, 307 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 221 SdHoareTripleChecker+Valid, 300 SdHoareTripleChecker+Invalid, 1094 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 307 IncrementalHoareTripleChecker+Valid, 787 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-23 03:31:12,450 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [221 Valid, 300 Invalid, 1094 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [307 Valid, 787 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-23 03:31:12,451 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 434 states. [2021-11-23 03:31:12,485 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 434 to 352. [2021-11-23 03:31:12,486 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 352 states, 240 states have (on average 1.0458333333333334) internal successors, (251), 235 states have internal predecessors, (251), 72 states have call successors, (72), 43 states have call predecessors, (72), 39 states have return successors, (360), 73 states have call predecessors, (360), 72 states have call successors, (360) [2021-11-23 03:31:12,491 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 352 states to 352 states and 683 transitions. [2021-11-23 03:31:12,492 INFO L78 Accepts]: Start accepts. Automaton has 352 states and 683 transitions. Word has length 1718 [2021-11-23 03:31:12,494 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:31:12,494 INFO L470 AbstractCegarLoop]: Abstraction has 352 states and 683 transitions. [2021-11-23 03:31:12,494 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 27 states have (on average 4.074074074074074) internal successors, (110), 28 states have internal predecessors, (110), 21 states have call successors, (35), 2 states have call predecessors, (35), 14 states have return successors, (44), 18 states have call predecessors, (44), 21 states have call successors, (44) [2021-11-23 03:31:12,494 INFO L276 IsEmpty]: Start isEmpty. Operand 352 states and 683 transitions. [2021-11-23 03:31:12,578 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2510 [2021-11-23 03:31:12,579 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:31:12,580 INFO L514 BasicCegarLoop]: trace histogram [189, 189, 180, 180, 149, 143, 94, 94, 94, 94, 94, 94, 94, 90, 90, 90, 90, 90, 90, 90, 55, 53, 46, 31, 1, 1, 1, 1, 1, 1] [2021-11-23 03:31:12,616 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-11-23 03:31:12,805 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:31:12,805 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:31:12,806 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:31:12,807 INFO L85 PathProgramCache]: Analyzing trace with hash -1400739883, now seen corresponding path program 10 times [2021-11-23 03:31:12,807 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:31:12,807 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [966593825] [2021-11-23 03:31:12,807 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:31:12,808 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:31:13,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:31:14,538 INFO L134 CoverageAnalysis]: Checked inductivity of 190187 backedges. 1165 proven. 8858 refuted. 0 times theorem prover too weak. 180164 trivial. 0 not checked. [2021-11-23 03:31:14,539 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:31:14,539 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [966593825] [2021-11-23 03:31:14,539 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [966593825] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:31:14,539 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1940813755] [2021-11-23 03:31:14,540 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 03:31:14,540 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:31:14,540 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:31:14,541 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:31:14,554 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-23 03:31:15,383 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:31:15,400 INFO L263 TraceCheckSpWp]: Trace formula consists of 5598 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-23 03:31:15,426 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:31:18,400 INFO L134 CoverageAnalysis]: Checked inductivity of 190187 backedges. 1165 proven. 8858 refuted. 0 times theorem prover too weak. 180164 trivial. 0 not checked. [2021-11-23 03:31:18,401 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:31:28,597 INFO L134 CoverageAnalysis]: Checked inductivity of 190187 backedges. 1165 proven. 8914 refuted. 0 times theorem prover too weak. 180108 trivial. 0 not checked. [2021-11-23 03:31:28,597 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1940813755] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:31:28,597 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1150329151] [2021-11-23 03:31:28,601 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2021-11-23 03:31:28,601 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:31:28,601 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 03:31:28,602 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 03:31:28,604 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 23] total 26 [2021-11-23 03:31:28,604 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1562533039] [2021-11-23 03:31:28,604 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 03:31:28,607 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-23 03:31:28,607 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:31:28,608 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-23 03:31:28,608 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=540, Unknown=0, NotChecked=0, Total=650 [2021-11-23 03:31:28,609 INFO L87 Difference]: Start difference. First operand 352 states and 683 transitions. Second operand has 26 states, 24 states have (on average 3.5833333333333335) internal successors, (86), 26 states have internal predecessors, (86), 23 states have call successors, (26), 1 states have call predecessors, (26), 11 states have return successors, (33), 11 states have call predecessors, (33), 23 states have call successors, (33) [2021-11-23 03:31:28,948 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:31:28,948 INFO L93 Difference]: Finished difference Result 392 states and 811 transitions. [2021-11-23 03:31:28,949 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-23 03:31:28,949 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 24 states have (on average 3.5833333333333335) internal successors, (86), 26 states have internal predecessors, (86), 23 states have call successors, (26), 1 states have call predecessors, (26), 11 states have return successors, (33), 11 states have call predecessors, (33), 23 states have call successors, (33) Word has length 2509 [2021-11-23 03:31:28,956 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:31:28,966 INFO L225 Difference]: With dead ends: 392 [2021-11-23 03:31:28,966 INFO L226 Difference]: Without dead ends: 378 [2021-11-23 03:31:28,968 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5049 GetRequests, 5015 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 178 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=240, Invalid=1020, Unknown=0, NotChecked=0, Total=1260 [2021-11-23 03:31:28,969 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 137 mSDsluCounter, 158 mSDsCounter, 0 mSdLazyCounter, 267 mSolverCounterSat, 125 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 155 SdHoareTripleChecker+Valid, 163 SdHoareTripleChecker+Invalid, 392 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 125 IncrementalHoareTripleChecker+Valid, 267 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 03:31:28,970 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [155 Valid, 163 Invalid, 392 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [125 Valid, 267 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 03:31:28,971 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 378 states. [2021-11-23 03:31:29,011 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 378 to 345. [2021-11-23 03:31:29,012 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 345 states, 236 states have (on average 1.0466101694915255) internal successors, (247), 231 states have internal predecessors, (247), 70 states have call successors, (70), 43 states have call predecessors, (70), 38 states have return successors, (338), 70 states have call predecessors, (338), 70 states have call successors, (338) [2021-11-23 03:31:29,018 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 345 states to 345 states and 655 transitions. [2021-11-23 03:31:29,018 INFO L78 Accepts]: Start accepts. Automaton has 345 states and 655 transitions. Word has length 2509 [2021-11-23 03:31:29,020 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:31:29,020 INFO L470 AbstractCegarLoop]: Abstraction has 345 states and 655 transitions. [2021-11-23 03:31:29,021 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 24 states have (on average 3.5833333333333335) internal successors, (86), 26 states have internal predecessors, (86), 23 states have call successors, (26), 1 states have call predecessors, (26), 11 states have return successors, (33), 11 states have call predecessors, (33), 23 states have call successors, (33) [2021-11-23 03:31:29,021 INFO L276 IsEmpty]: Start isEmpty. Operand 345 states and 655 transitions. [2021-11-23 03:31:29,166 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4548 [2021-11-23 03:31:29,166 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:31:29,167 INFO L514 BasicCegarLoop]: trace histogram [343, 343, 326, 326, 269, 261, 171, 171, 171, 171, 171, 171, 171, 163, 163, 163, 163, 163, 163, 163, 98, 98, 82, 57, 1, 1, 1, 1, 1, 1] [2021-11-23 03:31:29,193 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-23 03:31:29,368 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-11-23 03:31:29,368 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:31:29,368 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:31:29,369 INFO L85 PathProgramCache]: Analyzing trace with hash 1310289797, now seen corresponding path program 11 times [2021-11-23 03:31:29,369 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:31:29,369 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [254061977] [2021-11-23 03:31:29,369 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:31:29,370 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:31:30,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:31:33,191 INFO L134 CoverageAnalysis]: Checked inductivity of 627440 backedges. 2292 proven. 14012 refuted. 0 times theorem prover too weak. 611136 trivial. 0 not checked. [2021-11-23 03:31:33,192 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:31:33,192 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [254061977] [2021-11-23 03:31:33,192 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [254061977] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:31:33,192 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1784975354] [2021-11-23 03:31:33,193 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 03:31:33,193 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:31:33,193 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:31:33,194 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:31:33,205 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-23 03:31:33,696 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2021-11-23 03:31:33,696 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:31:33,700 INFO L263 TraceCheckSpWp]: Trace formula consists of 436 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 03:31:33,830 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:31:38,710 INFO L134 CoverageAnalysis]: Checked inductivity of 627440 backedges. 37606 proven. 20 refuted. 0 times theorem prover too weak. 589814 trivial. 0 not checked. [2021-11-23 03:31:38,711 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:31:53,324 INFO L134 CoverageAnalysis]: Checked inductivity of 627440 backedges. 12695 proven. 190 refuted. 0 times theorem prover too weak. 614555 trivial. 0 not checked. [2021-11-23 03:31:53,324 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1784975354] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:31:53,324 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [851164686] [2021-11-23 03:31:53,328 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2021-11-23 03:31:53,328 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:31:53,328 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 03:31:53,329 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 03:31:53,333 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 11, 11] total 23 [2021-11-23 03:31:53,333 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1403385500] [2021-11-23 03:31:53,333 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 03:31:53,341 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-11-23 03:31:53,341 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:31:53,341 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-11-23 03:31:53,342 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=439, Unknown=0, NotChecked=0, Total=506 [2021-11-23 03:31:53,342 INFO L87 Difference]: Start difference. First operand 345 states and 655 transitions. Second operand has 23 states, 22 states have (on average 4.136363636363637) internal successors, (91), 23 states have internal predecessors, (91), 16 states have call successors, (27), 2 states have call predecessors, (27), 13 states have return successors, (38), 14 states have call predecessors, (38), 16 states have call successors, (38) [2021-11-23 03:31:53,980 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:31:53,980 INFO L93 Difference]: Finished difference Result 741 states and 1574 transitions. [2021-11-23 03:31:53,980 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-11-23 03:31:53,981 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 22 states have (on average 4.136363636363637) internal successors, (91), 23 states have internal predecessors, (91), 16 states have call successors, (27), 2 states have call predecessors, (27), 13 states have return successors, (38), 14 states have call predecessors, (38), 16 states have call successors, (38) Word has length 4547 [2021-11-23 03:31:53,982 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:31:53,989 INFO L225 Difference]: With dead ends: 741 [2021-11-23 03:31:53,990 INFO L226 Difference]: Without dead ends: 408 [2021-11-23 03:31:53,996 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 9133 GetRequests, 9088 SyntacticMatches, 4 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 280 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=310, Invalid=1496, Unknown=0, NotChecked=0, Total=1806 [2021-11-23 03:31:53,997 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 173 mSDsluCounter, 211 mSDsCounter, 0 mSdLazyCounter, 510 mSolverCounterSat, 176 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 174 SdHoareTripleChecker+Valid, 220 SdHoareTripleChecker+Invalid, 686 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 176 IncrementalHoareTripleChecker+Valid, 510 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 03:31:53,997 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [174 Valid, 220 Invalid, 686 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [176 Valid, 510 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-23 03:31:53,998 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 408 states. [2021-11-23 03:31:54,029 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 408 to 352. [2021-11-23 03:31:54,031 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 352 states, 245 states have (on average 1.0530612244897959) internal successors, (258), 239 states have internal predecessors, (258), 72 states have call successors, (72), 50 states have call predecessors, (72), 34 states have return successors, (299), 62 states have call predecessors, (299), 72 states have call successors, (299) [2021-11-23 03:31:54,127 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 352 states to 352 states and 629 transitions. [2021-11-23 03:31:54,127 INFO L78 Accepts]: Start accepts. Automaton has 352 states and 629 transitions. Word has length 4547 [2021-11-23 03:31:54,129 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:31:54,129 INFO L470 AbstractCegarLoop]: Abstraction has 352 states and 629 transitions. [2021-11-23 03:31:54,130 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 22 states have (on average 4.136363636363637) internal successors, (91), 23 states have internal predecessors, (91), 16 states have call successors, (27), 2 states have call predecessors, (27), 13 states have return successors, (38), 14 states have call predecessors, (38), 16 states have call successors, (38) [2021-11-23 03:31:54,130 INFO L276 IsEmpty]: Start isEmpty. Operand 352 states and 629 transitions. [2021-11-23 03:31:54,193 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2866 [2021-11-23 03:31:54,193 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:31:54,194 INFO L514 BasicCegarLoop]: trace histogram [215, 215, 206, 206, 169, 167, 107, 107, 107, 107, 107, 107, 107, 103, 103, 103, 103, 103, 103, 103, 64, 62, 48, 37, 1, 1, 1, 1, 1, 1] [2021-11-23 03:31:54,233 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-11-23 03:31:54,417 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:31:54,418 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:31:54,418 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:31:54,419 INFO L85 PathProgramCache]: Analyzing trace with hash -150558211, now seen corresponding path program 12 times [2021-11-23 03:31:54,419 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:31:54,419 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [897169069] [2021-11-23 03:31:54,419 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:31:54,420 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:31:55,283 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:31:56,439 INFO L134 CoverageAnalysis]: Checked inductivity of 248233 backedges. 1462 proven. 8724 refuted. 0 times theorem prover too weak. 238047 trivial. 0 not checked. [2021-11-23 03:31:56,440 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:31:56,440 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [897169069] [2021-11-23 03:31:56,440 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [897169069] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:31:56,440 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1684807249] [2021-11-23 03:31:56,440 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 03:31:56,440 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:31:56,441 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:31:56,441 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:31:56,446 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-11-23 03:31:57,275 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 03:31:57,275 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:31:57,291 INFO L263 TraceCheckSpWp]: Trace formula consists of 5097 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-23 03:31:57,327 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:32:00,564 INFO L134 CoverageAnalysis]: Checked inductivity of 248233 backedges. 20176 proven. 88 refuted. 0 times theorem prover too weak. 227969 trivial. 0 not checked. [2021-11-23 03:32:00,564 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:32:10,463 INFO L134 CoverageAnalysis]: Checked inductivity of 248233 backedges. 1533 proven. 9675 refuted. 0 times theorem prover too weak. 237025 trivial. 0 not checked. [2021-11-23 03:32:10,463 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1684807249] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:32:10,463 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1098879809] [2021-11-23 03:32:10,466 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2021-11-23 03:32:10,466 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:32:10,467 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 03:32:10,467 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 03:32:10,469 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13, 15] total 27 [2021-11-23 03:32:10,469 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [7299976] [2021-11-23 03:32:10,469 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 03:32:10,473 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-11-23 03:32:10,473 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:32:10,474 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-11-23 03:32:10,474 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=618, Unknown=0, NotChecked=0, Total=702 [2021-11-23 03:32:10,474 INFO L87 Difference]: Start difference. First operand 352 states and 629 transitions. Second operand has 27 states, 26 states have (on average 4.038461538461538) internal successors, (105), 27 states have internal predecessors, (105), 21 states have call successors, (33), 2 states have call predecessors, (33), 15 states have return successors, (43), 17 states have call predecessors, (43), 21 states have call successors, (43) [2021-11-23 03:32:11,660 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:32:11,660 INFO L93 Difference]: Finished difference Result 825 states and 1726 transitions. [2021-11-23 03:32:11,661 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-11-23 03:32:11,661 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 26 states have (on average 4.038461538461538) internal successors, (105), 27 states have internal predecessors, (105), 21 states have call successors, (33), 2 states have call predecessors, (33), 15 states have return successors, (43), 17 states have call predecessors, (43), 21 states have call successors, (43) Word has length 2865 [2021-11-23 03:32:11,662 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:32:11,670 INFO L225 Difference]: With dead ends: 825 [2021-11-23 03:32:11,671 INFO L226 Difference]: Without dead ends: 484 [2021-11-23 03:32:11,678 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5783 GetRequests, 5721 SyntacticMatches, 3 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 743 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=557, Invalid=3103, Unknown=0, NotChecked=0, Total=3660 [2021-11-23 03:32:11,679 INFO L933 BasicCegarLoop]: 36 mSDtfsCounter, 196 mSDsluCounter, 393 mSDsCounter, 0 mSdLazyCounter, 1095 mSolverCounterSat, 229 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 197 SdHoareTripleChecker+Valid, 414 SdHoareTripleChecker+Invalid, 1324 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 229 IncrementalHoareTripleChecker+Valid, 1095 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-23 03:32:11,679 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [197 Valid, 414 Invalid, 1324 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [229 Valid, 1095 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-23 03:32:11,684 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 484 states. [2021-11-23 03:32:11,722 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 484 to 379. [2021-11-23 03:32:11,724 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 379 states, 265 states have (on average 1.0528301886792453) internal successors, (279), 259 states have internal predecessors, (279), 80 states have call successors, (80), 57 states have call predecessors, (80), 33 states have return successors, (304), 62 states have call predecessors, (304), 80 states have call successors, (304) [2021-11-23 03:32:11,728 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 379 states to 379 states and 663 transitions. [2021-11-23 03:32:11,729 INFO L78 Accepts]: Start accepts. Automaton has 379 states and 663 transitions. Word has length 2865 [2021-11-23 03:32:11,730 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:32:11,730 INFO L470 AbstractCegarLoop]: Abstraction has 379 states and 663 transitions. [2021-11-23 03:32:11,730 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 26 states have (on average 4.038461538461538) internal successors, (105), 27 states have internal predecessors, (105), 21 states have call successors, (33), 2 states have call predecessors, (33), 15 states have return successors, (43), 17 states have call predecessors, (43), 21 states have call successors, (43) [2021-11-23 03:32:11,731 INFO L276 IsEmpty]: Start isEmpty. Operand 379 states and 663 transitions. [2021-11-23 03:32:11,789 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2707 [2021-11-23 03:32:11,789 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:32:11,790 INFO L514 BasicCegarLoop]: trace histogram [199, 199, 198, 198, 161, 160, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 62, 61, 38, 38, 1, 1, 1, 1, 1, 1] [2021-11-23 03:32:11,834 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2021-11-23 03:32:12,017 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:32:12,018 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:32:12,018 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:32:12,018 INFO L85 PathProgramCache]: Analyzing trace with hash 802575363, now seen corresponding path program 13 times [2021-11-23 03:32:12,018 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:32:12,019 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [918599319] [2021-11-23 03:32:12,019 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:32:12,019 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:32:12,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:32:13,557 INFO L134 CoverageAnalysis]: Checked inductivity of 221224 backedges. 1255 proven. 10689 refuted. 0 times theorem prover too weak. 209280 trivial. 0 not checked. [2021-11-23 03:32:13,558 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:32:13,558 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [918599319] [2021-11-23 03:32:13,558 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [918599319] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:32:13,558 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [407737371] [2021-11-23 03:32:13,558 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 03:32:13,558 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:32:13,558 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:32:13,559 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:32:13,562 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-11-23 03:32:14,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:32:14,413 INFO L263 TraceCheckSpWp]: Trace formula consists of 6034 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-23 03:32:14,441 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:32:17,327 INFO L134 CoverageAnalysis]: Checked inductivity of 221224 backedges. 1255 proven. 10689 refuted. 0 times theorem prover too weak. 209280 trivial. 0 not checked. [2021-11-23 03:32:17,327 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:32:28,718 INFO L134 CoverageAnalysis]: Checked inductivity of 221224 backedges. 1255 proven. 10759 refuted. 0 times theorem prover too weak. 209210 trivial. 0 not checked. [2021-11-23 03:32:28,718 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [407737371] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:32:28,718 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [571478131] [2021-11-23 03:32:28,720 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2021-11-23 03:32:28,720 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:32:28,720 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 03:32:28,721 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 03:32:28,723 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 25] total 28 [2021-11-23 03:32:28,723 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1571636916] [2021-11-23 03:32:28,723 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 03:32:28,726 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2021-11-23 03:32:28,726 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:32:28,727 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-11-23 03:32:28,727 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=630, Unknown=0, NotChecked=0, Total=756 [2021-11-23 03:32:28,727 INFO L87 Difference]: Start difference. First operand 379 states and 663 transitions. Second operand has 28 states, 26 states have (on average 3.5384615384615383) internal successors, (92), 28 states have internal predecessors, (92), 25 states have call successors, (28), 1 states have call predecessors, (28), 12 states have return successors, (36), 12 states have call predecessors, (36), 25 states have call successors, (36) [2021-11-23 03:32:29,031 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:32:29,031 INFO L93 Difference]: Finished difference Result 411 states and 762 transitions. [2021-11-23 03:32:29,032 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-23 03:32:29,032 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 26 states have (on average 3.5384615384615383) internal successors, (92), 28 states have internal predecessors, (92), 25 states have call successors, (28), 1 states have call predecessors, (28), 12 states have return successors, (36), 12 states have call predecessors, (36), 25 states have call successors, (36) Word has length 2706 [2021-11-23 03:32:29,038 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:32:29,045 INFO L225 Difference]: With dead ends: 411 [2021-11-23 03:32:29,046 INFO L226 Difference]: Without dead ends: 397 [2021-11-23 03:32:29,047 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5446 GetRequests, 5409 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 215 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=281, Invalid=1201, Unknown=0, NotChecked=0, Total=1482 [2021-11-23 03:32:29,048 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 90 mSDsluCounter, 172 mSDsCounter, 0 mSdLazyCounter, 299 mSolverCounterSat, 73 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 109 SdHoareTripleChecker+Valid, 176 SdHoareTripleChecker+Invalid, 372 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 73 IncrementalHoareTripleChecker+Valid, 299 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 03:32:29,048 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [109 Valid, 176 Invalid, 372 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [73 Valid, 299 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 03:32:29,049 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 397 states. [2021-11-23 03:32:29,084 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 397 to 387. [2021-11-23 03:32:29,085 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 387 states, 270 states have (on average 1.0518518518518518) internal successors, (284), 264 states have internal predecessors, (284), 81 states have call successors, (81), 57 states have call predecessors, (81), 35 states have return successors, (318), 65 states have call predecessors, (318), 81 states have call successors, (318) [2021-11-23 03:32:29,090 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 387 states to 387 states and 683 transitions. [2021-11-23 03:32:29,090 INFO L78 Accepts]: Start accepts. Automaton has 387 states and 683 transitions. Word has length 2706 [2021-11-23 03:32:29,092 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:32:29,092 INFO L470 AbstractCegarLoop]: Abstraction has 387 states and 683 transitions. [2021-11-23 03:32:29,093 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 26 states have (on average 3.5384615384615383) internal successors, (92), 28 states have internal predecessors, (92), 25 states have call successors, (28), 1 states have call predecessors, (28), 12 states have return successors, (36), 12 states have call predecessors, (36), 25 states have call successors, (36) [2021-11-23 03:32:29,093 INFO L276 IsEmpty]: Start isEmpty. Operand 387 states and 683 transitions. [2021-11-23 03:32:29,147 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2598 [2021-11-23 03:32:29,147 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:32:29,149 INFO L514 BasicCegarLoop]: trace histogram [191, 191, 190, 190, 155, 153, 95, 95, 95, 95, 95, 95, 95, 95, 95, 95, 95, 95, 95, 95, 60, 58, 37, 36, 1, 1, 1, 1, 1, 1] [2021-11-23 03:32:29,193 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-11-23 03:32:29,361 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:32:29,361 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:32:29,362 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:32:29,363 INFO L85 PathProgramCache]: Analyzing trace with hash -1160689679, now seen corresponding path program 14 times [2021-11-23 03:32:29,363 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:32:29,363 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1491169801] [2021-11-23 03:32:29,363 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:32:29,363 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:32:29,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:32:30,760 INFO L134 CoverageAnalysis]: Checked inductivity of 203683 backedges. 2671 proven. 7728 refuted. 0 times theorem prover too weak. 193284 trivial. 0 not checked. [2021-11-23 03:32:30,760 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:32:30,760 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1491169801] [2021-11-23 03:32:30,761 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1491169801] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:32:30,761 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [294860083] [2021-11-23 03:32:30,761 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 03:32:30,761 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:32:30,761 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:32:30,762 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:32:30,763 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-11-23 03:32:31,389 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 48 check-sat command(s) [2021-11-23 03:32:31,389 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:32:31,396 INFO L263 TraceCheckSpWp]: Trace formula consists of 1833 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-23 03:32:31,415 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:32:34,174 INFO L134 CoverageAnalysis]: Checked inductivity of 203683 backedges. 1551 proven. 10938 refuted. 0 times theorem prover too weak. 191194 trivial. 0 not checked. [2021-11-23 03:32:34,174 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:32:46,171 INFO L134 CoverageAnalysis]: Checked inductivity of 203683 backedges. 1551 proven. 11023 refuted. 0 times theorem prover too weak. 191109 trivial. 0 not checked. [2021-11-23 03:32:46,171 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [294860083] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:32:46,171 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [582580322] [2021-11-23 03:32:46,173 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2021-11-23 03:32:46,173 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:32:46,174 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 03:32:46,174 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 03:32:46,176 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 17, 27] total 34 [2021-11-23 03:32:46,177 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1484422310] [2021-11-23 03:32:46,177 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 03:32:46,181 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-23 03:32:46,182 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:32:46,182 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-23 03:32:46,183 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=182, Invalid=940, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 03:32:46,183 INFO L87 Difference]: Start difference. First operand 387 states and 683 transitions. Second operand has 34 states, 32 states have (on average 3.4375) internal successors, (110), 34 states have internal predecessors, (110), 30 states have call successors, (34), 1 states have call predecessors, (34), 17 states have return successors, (48), 18 states have call predecessors, (48), 30 states have call successors, (48) [2021-11-23 03:32:46,837 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:32:46,837 INFO L93 Difference]: Finished difference Result 461 states and 955 transitions. [2021-11-23 03:32:46,840 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-11-23 03:32:46,841 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 32 states have (on average 3.4375) internal successors, (110), 34 states have internal predecessors, (110), 30 states have call successors, (34), 1 states have call predecessors, (34), 17 states have return successors, (48), 18 states have call predecessors, (48), 30 states have call successors, (48) Word has length 2597 [2021-11-23 03:32:46,845 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:32:46,853 INFO L225 Difference]: With dead ends: 461 [2021-11-23 03:32:46,854 INFO L226 Difference]: Without dead ends: 434 [2021-11-23 03:32:46,857 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5231 GetRequests, 5183 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 509 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=454, Invalid=1996, Unknown=0, NotChecked=0, Total=2450 [2021-11-23 03:32:46,858 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 206 mSDsluCounter, 220 mSDsCounter, 0 mSdLazyCounter, 547 mSolverCounterSat, 263 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 223 SdHoareTripleChecker+Valid, 222 SdHoareTripleChecker+Invalid, 810 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 263 IncrementalHoareTripleChecker+Valid, 547 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 03:32:46,859 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [223 Valid, 222 Invalid, 810 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [263 Valid, 547 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 03:32:46,860 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 434 states. [2021-11-23 03:32:46,904 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 434 to 408. [2021-11-23 03:32:46,906 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 408 states, 283 states have (on average 1.0494699646643109) internal successors, (297), 277 states have internal predecessors, (297), 84 states have call successors, (84), 57 states have call predecessors, (84), 40 states have return successors, (356), 73 states have call predecessors, (356), 84 states have call successors, (356) [2021-11-23 03:32:46,911 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 408 states to 408 states and 737 transitions. [2021-11-23 03:32:46,913 INFO L78 Accepts]: Start accepts. Automaton has 408 states and 737 transitions. Word has length 2597 [2021-11-23 03:32:46,915 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:32:46,915 INFO L470 AbstractCegarLoop]: Abstraction has 408 states and 737 transitions. [2021-11-23 03:32:46,915 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 32 states have (on average 3.4375) internal successors, (110), 34 states have internal predecessors, (110), 30 states have call successors, (34), 1 states have call predecessors, (34), 17 states have return successors, (48), 18 states have call predecessors, (48), 30 states have call successors, (48) [2021-11-23 03:32:46,916 INFO L276 IsEmpty]: Start isEmpty. Operand 408 states and 737 transitions. [2021-11-23 03:32:47,479 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8004 [2021-11-23 03:32:47,479 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:32:47,482 INFO L514 BasicCegarLoop]: trace histogram [593, 593, 582, 582, 481, 469, 296, 296, 296, 296, 296, 296, 296, 291, 291, 291, 291, 291, 291, 291, 190, 173, 113, 112, 1, 1, 1, 1, 1, 1] [2021-11-23 03:32:47,504 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2021-11-23 03:32:47,682 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:32:47,682 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:32:47,683 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:32:47,684 INFO L85 PathProgramCache]: Analyzing trace with hash 1217821722, now seen corresponding path program 15 times [2021-11-23 03:32:47,685 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:32:47,685 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [40428070] [2021-11-23 03:32:47,685 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:32:47,685 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:32:51,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:32:56,680 INFO L134 CoverageAnalysis]: Checked inductivity of 1947002 backedges. 5130 proven. 27525 refuted. 0 times theorem prover too weak. 1914347 trivial. 0 not checked. [2021-11-23 03:32:56,680 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:32:56,680 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [40428070] [2021-11-23 03:32:56,680 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [40428070] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:32:56,681 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [225277001] [2021-11-23 03:32:56,681 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 03:32:56,681 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:32:56,682 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:32:56,683 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:32:56,684 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2021-11-23 03:32:58,744 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 03:32:58,744 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:32:58,791 INFO L263 TraceCheckSpWp]: Trace formula consists of 14242 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-23 03:32:58,857 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:33:07,787 INFO L134 CoverageAnalysis]: Checked inductivity of 1947002 backedges. 263683 proven. 1897 refuted. 0 times theorem prover too weak. 1681422 trivial. 0 not checked. [2021-11-23 03:33:07,787 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:33:39,759 INFO L134 CoverageAnalysis]: Checked inductivity of 1947002 backedges. 4815 proven. 52302 refuted. 0 times theorem prover too weak. 1889885 trivial. 0 not checked. [2021-11-23 03:33:39,760 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [225277001] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:33:39,760 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1001508323] [2021-11-23 03:33:39,765 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2021-11-23 03:33:39,765 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:33:39,765 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 03:33:39,766 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 03:33:39,773 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 21, 31] total 45 [2021-11-23 03:33:39,773 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [606070495] [2021-11-23 03:33:39,774 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 03:33:39,781 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2021-11-23 03:33:39,781 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:33:39,782 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2021-11-23 03:33:39,783 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=209, Invalid=1771, Unknown=0, NotChecked=0, Total=1980 [2021-11-23 03:33:39,783 INFO L87 Difference]: Start difference. First operand 408 states and 737 transitions. Second operand has 45 states, 44 states have (on average 3.6136363636363638) internal successors, (159), 45 states have internal predecessors, (159), 39 states have call successors, (50), 2 states have call predecessors, (50), 25 states have return successors, (70), 25 states have call predecessors, (70), 39 states have call successors, (70) [2021-11-23 03:33:42,729 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:33:42,729 INFO L93 Difference]: Finished difference Result 1220 states and 2831 transitions. [2021-11-23 03:33:42,730 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 85 states. [2021-11-23 03:33:42,730 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 44 states have (on average 3.6136363636363638) internal successors, (159), 45 states have internal predecessors, (159), 39 states have call successors, (50), 2 states have call predecessors, (50), 25 states have return successors, (70), 25 states have call predecessors, (70), 39 states have call successors, (70) Word has length 8003 [2021-11-23 03:33:42,731 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:33:42,747 INFO L225 Difference]: With dead ends: 1220 [2021-11-23 03:33:42,747 INFO L226 Difference]: Without dead ends: 768 [2021-11-23 03:33:42,760 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 16093 GetRequests, 15982 SyntacticMatches, 2 SemanticMatches, 109 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3406 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1626, Invalid=10584, Unknown=0, NotChecked=0, Total=12210 [2021-11-23 03:33:42,761 INFO L933 BasicCegarLoop]: 40 mSDtfsCounter, 565 mSDsluCounter, 632 mSDsCounter, 0 mSdLazyCounter, 2247 mSolverCounterSat, 1156 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 566 SdHoareTripleChecker+Valid, 650 SdHoareTripleChecker+Invalid, 3403 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1156 IncrementalHoareTripleChecker+Valid, 2247 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.6s IncrementalHoareTripleChecker+Time [2021-11-23 03:33:42,761 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [566 Valid, 650 Invalid, 3403 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1156 Valid, 2247 Invalid, 0 Unknown, 0 Unchecked, 1.6s Time] [2021-11-23 03:33:42,762 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 768 states. [2021-11-23 03:33:42,827 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 768 to 587. [2021-11-23 03:33:42,829 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 587 states, 408 states have (on average 1.0441176470588236) internal successors, (426), 400 states have internal predecessors, (426), 125 states have call successors, (125), 85 states have call predecessors, (125), 53 states have return successors, (667), 101 states have call predecessors, (667), 125 states have call successors, (667) [2021-11-23 03:33:42,835 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 587 states to 587 states and 1218 transitions. [2021-11-23 03:33:42,836 INFO L78 Accepts]: Start accepts. Automaton has 587 states and 1218 transitions. Word has length 8003 [2021-11-23 03:33:42,838 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:33:42,838 INFO L470 AbstractCegarLoop]: Abstraction has 587 states and 1218 transitions. [2021-11-23 03:33:42,838 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 45 states, 44 states have (on average 3.6136363636363638) internal successors, (159), 45 states have internal predecessors, (159), 39 states have call successors, (50), 2 states have call predecessors, (50), 25 states have return successors, (70), 25 states have call predecessors, (70), 39 states have call successors, (70) [2021-11-23 03:33:42,839 INFO L276 IsEmpty]: Start isEmpty. Operand 587 states and 1218 transitions. [2021-11-23 03:33:43,350 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8590 [2021-11-23 03:33:43,350 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:33:43,353 INFO L514 BasicCegarLoop]: trace histogram [631, 631, 630, 630, 515, 505, 315, 315, 315, 315, 315, 315, 315, 315, 315, 315, 315, 315, 315, 315, 200, 190, 126, 115, 1, 1, 1, 1, 1, 1] [2021-11-23 03:33:43,387 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2021-11-23 03:33:43,553 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2021-11-23 03:33:43,554 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:33:43,554 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:33:43,556 INFO L85 PathProgramCache]: Analyzing trace with hash -979972239, now seen corresponding path program 16 times [2021-11-23 03:33:43,556 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:33:43,556 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [522551793] [2021-11-23 03:33:43,556 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:33:43,556 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:33:48,513 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:33:53,901 INFO L134 CoverageAnalysis]: Checked inductivity of 2242855 backedges. 3972 proven. 41898 refuted. 0 times theorem prover too weak. 2196985 trivial. 0 not checked. [2021-11-23 03:33:53,901 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:33:53,901 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [522551793] [2021-11-23 03:33:53,901 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [522551793] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:33:53,901 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1781201287] [2021-11-23 03:33:53,902 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 03:33:53,902 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:33:53,902 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:33:53,903 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:33:53,904 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-11-23 03:33:56,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:33:56,565 INFO L263 TraceCheckSpWp]: Trace formula consists of 19096 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-23 03:33:56,631 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:34:05,755 INFO L134 CoverageAnalysis]: Checked inductivity of 2242855 backedges. 3972 proven. 41898 refuted. 0 times theorem prover too weak. 2196985 trivial. 0 not checked. [2021-11-23 03:34:05,756 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:34:39,664 INFO L134 CoverageAnalysis]: Checked inductivity of 2242855 backedges. 3972 proven. 42000 refuted. 0 times theorem prover too weak. 2196883 trivial. 0 not checked. [2021-11-23 03:34:39,664 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1781201287] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:34:39,664 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1306262014] [2021-11-23 03:34:39,668 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2021-11-23 03:34:39,668 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:34:39,668 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 03:34:39,669 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 03:34:39,676 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 29] total 32 [2021-11-23 03:34:39,676 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [876334469] [2021-11-23 03:34:39,676 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 03:34:39,680 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-23 03:34:39,681 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:34:39,681 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-23 03:34:39,682 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=160, Invalid=832, Unknown=0, NotChecked=0, Total=992 [2021-11-23 03:34:39,682 INFO L87 Difference]: Start difference. First operand 587 states and 1218 transitions. Second operand has 32 states, 30 states have (on average 3.466666666666667) internal successors, (104), 32 states have internal predecessors, (104), 29 states have call successors, (32), 1 states have call predecessors, (32), 14 states have return successors, (42), 14 states have call predecessors, (42), 29 states have call successors, (42) [2021-11-23 03:34:40,113 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:34:40,113 INFO L93 Difference]: Finished difference Result 642 states and 1465 transitions. [2021-11-23 03:34:40,113 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-23 03:34:40,114 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 30 states have (on average 3.466666666666667) internal successors, (104), 32 states have internal predecessors, (104), 29 states have call successors, (32), 1 states have call predecessors, (32), 14 states have return successors, (42), 14 states have call predecessors, (42), 29 states have call successors, (42) Word has length 8589 [2021-11-23 03:34:40,125 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:34:40,139 INFO L225 Difference]: With dead ends: 642 [2021-11-23 03:34:40,140 INFO L226 Difference]: Without dead ends: 628 [2021-11-23 03:34:40,142 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 17218 GetRequests, 17175 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 306 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=369, Invalid=1611, Unknown=0, NotChecked=0, Total=1980 [2021-11-23 03:34:40,143 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 213 mSDsluCounter, 199 mSDsCounter, 0 mSdLazyCounter, 387 mSolverCounterSat, 211 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 235 SdHoareTripleChecker+Valid, 201 SdHoareTripleChecker+Invalid, 598 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 211 IncrementalHoareTripleChecker+Valid, 387 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 03:34:40,143 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [235 Valid, 201 Invalid, 598 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [211 Valid, 387 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 03:34:40,144 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 628 states. [2021-11-23 03:34:40,209 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 628 to 610. [2021-11-23 03:34:40,211 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 610 states, 422 states have (on average 1.042654028436019) internal successors, (440), 414 states have internal predecessors, (440), 129 states have call successors, (129), 85 states have call predecessors, (129), 58 states have return successors, (755), 110 states have call predecessors, (755), 129 states have call successors, (755) [2021-11-23 03:34:40,217 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 610 states to 610 states and 1324 transitions. [2021-11-23 03:34:40,218 INFO L78 Accepts]: Start accepts. Automaton has 610 states and 1324 transitions. Word has length 8589 [2021-11-23 03:34:40,220 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:34:40,220 INFO L470 AbstractCegarLoop]: Abstraction has 610 states and 1324 transitions. [2021-11-23 03:34:40,220 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 30 states have (on average 3.466666666666667) internal successors, (104), 32 states have internal predecessors, (104), 29 states have call successors, (32), 1 states have call predecessors, (32), 14 states have return successors, (42), 14 states have call predecessors, (42), 29 states have call successors, (42) [2021-11-23 03:34:40,220 INFO L276 IsEmpty]: Start isEmpty. Operand 610 states and 1324 transitions. [2021-11-23 03:34:40,553 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6125 [2021-11-23 03:34:40,553 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:34:40,555 INFO L514 BasicCegarLoop]: trace histogram [457, 457, 442, 442, 365, 362, 228, 228, 228, 228, 228, 228, 228, 221, 221, 221, 221, 221, 221, 221, 144, 134, 92, 80, 1, 1, 1, 1, 1, 1] [2021-11-23 03:34:40,596 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2021-11-23 03:34:40,755 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2021-11-23 03:34:40,756 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:34:40,757 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:34:40,758 INFO L85 PathProgramCache]: Analyzing trace with hash 1181878832, now seen corresponding path program 17 times [2021-11-23 03:34:40,758 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:34:40,758 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [627069397] [2021-11-23 03:34:40,759 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:34:40,759 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:34:42,402 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:34:45,935 INFO L134 CoverageAnalysis]: Checked inductivity of 1139151 backedges. 4537 proven. 32650 refuted. 0 times theorem prover too weak. 1101964 trivial. 0 not checked. [2021-11-23 03:34:45,935 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:34:45,935 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [627069397] [2021-11-23 03:34:45,935 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [627069397] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:34:45,936 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [848558329] [2021-11-23 03:34:45,936 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 03:34:45,936 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:34:45,936 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:34:45,948 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:34:45,983 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2021-11-23 03:34:46,970 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 47 check-sat command(s) [2021-11-23 03:34:46,970 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:34:46,978 INFO L263 TraceCheckSpWp]: Trace formula consists of 1623 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-23 03:34:47,017 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:34:53,411 INFO L134 CoverageAnalysis]: Checked inductivity of 1139151 backedges. 121608 proven. 293 refuted. 0 times theorem prover too weak. 1017250 trivial. 0 not checked. [2021-11-23 03:34:53,411 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:35:14,885 INFO L134 CoverageAnalysis]: Checked inductivity of 1139151 backedges. 23051 proven. 1257 refuted. 0 times theorem prover too weak. 1114843 trivial. 0 not checked. [2021-11-23 03:35:14,885 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [848558329] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:35:14,885 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [389857291] [2021-11-23 03:35:14,888 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2021-11-23 03:35:14,888 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:35:14,888 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 03:35:14,888 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 03:35:14,892 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 15, 19] total 34 [2021-11-23 03:35:14,893 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [111613605] [2021-11-23 03:35:14,893 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 03:35:14,901 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-23 03:35:14,901 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:35:14,902 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-23 03:35:14,902 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=130, Invalid=992, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 03:35:14,903 INFO L87 Difference]: Start difference. First operand 610 states and 1324 transitions. Second operand has 34 states, 34 states have (on average 3.676470588235294) internal successors, (125), 34 states have internal predecessors, (125), 24 states have call successors, (42), 2 states have call predecessors, (42), 17 states have return successors, (58), 25 states have call predecessors, (58), 24 states have call successors, (58) [2021-11-23 03:35:16,111 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:35:16,111 INFO L93 Difference]: Finished difference Result 1277 states and 3026 transitions. [2021-11-23 03:35:16,111 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2021-11-23 03:35:16,112 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 3.676470588235294) internal successors, (125), 34 states have internal predecessors, (125), 24 states have call successors, (42), 2 states have call predecessors, (42), 17 states have return successors, (58), 25 states have call predecessors, (58), 24 states have call successors, (58) Word has length 6124 [2021-11-23 03:35:16,112 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:35:16,126 INFO L225 Difference]: With dead ends: 1277 [2021-11-23 03:35:16,127 INFO L226 Difference]: Without dead ends: 671 [2021-11-23 03:35:16,280 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 12309 GetRequests, 12237 SyntacticMatches, 2 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1189 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=715, Invalid=4397, Unknown=0, NotChecked=0, Total=5112 [2021-11-23 03:35:16,283 INFO L933 BasicCegarLoop]: 47 mSDtfsCounter, 219 mSDsluCounter, 570 mSDsCounter, 0 mSdLazyCounter, 1250 mSolverCounterSat, 261 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 219 SdHoareTripleChecker+Valid, 599 SdHoareTripleChecker+Invalid, 1511 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 261 IncrementalHoareTripleChecker+Valid, 1250 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-23 03:35:16,284 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [219 Valid, 599 Invalid, 1511 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [261 Valid, 1250 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-23 03:35:16,285 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 671 states. [2021-11-23 03:35:16,352 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 671 to 535. [2021-11-23 03:35:16,359 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 535 states, 374 states have (on average 1.0427807486631016) internal successors, (390), 368 states have internal predecessors, (390), 113 states have call successors, (113), 81 states have call predecessors, (113), 47 states have return successors, (583), 85 states have call predecessors, (583), 113 states have call successors, (583) [2021-11-23 03:35:16,365 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 535 states to 535 states and 1086 transitions. [2021-11-23 03:35:16,366 INFO L78 Accepts]: Start accepts. Automaton has 535 states and 1086 transitions. Word has length 6124 [2021-11-23 03:35:16,369 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:35:16,369 INFO L470 AbstractCegarLoop]: Abstraction has 535 states and 1086 transitions. [2021-11-23 03:35:16,370 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 3.676470588235294) internal successors, (125), 34 states have internal predecessors, (125), 24 states have call successors, (42), 2 states have call predecessors, (42), 17 states have return successors, (58), 25 states have call predecessors, (58), 24 states have call successors, (58) [2021-11-23 03:35:16,370 INFO L276 IsEmpty]: Start isEmpty. Operand 535 states and 1086 transitions. [2021-11-23 03:35:17,236 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12293 [2021-11-23 03:35:17,236 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:35:17,240 INFO L514 BasicCegarLoop]: trace histogram [931, 931, 874, 874, 734, 725, 465, 465, 465, 465, 465, 465, 465, 437, 437, 437, 437, 437, 437, 437, 297, 260, 197, 149, 1, 1, 1, 1, 1, 1] [2021-11-23 03:35:17,264 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2021-11-23 03:35:17,441 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24,24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:35:17,441 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:35:17,441 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:35:17,443 INFO L85 PathProgramCache]: Analyzing trace with hash 614593505, now seen corresponding path program 18 times [2021-11-23 03:35:17,443 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:35:17,443 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1159932653] [2021-11-23 03:35:17,444 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:35:17,444 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:35:25,431 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:35:37,162 INFO L134 CoverageAnalysis]: Checked inductivity of 4601709 backedges. 7928 proven. 42346 refuted. 0 times theorem prover too weak. 4551435 trivial. 0 not checked. [2021-11-23 03:35:37,163 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:35:37,163 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1159932653] [2021-11-23 03:35:37,163 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1159932653] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:35:37,163 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [868497756] [2021-11-23 03:35:37,163 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 03:35:37,164 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:35:37,164 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:35:37,164 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:35:37,168 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2021-11-23 03:35:40,212 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 03:35:40,212 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:35:40,287 INFO L263 TraceCheckSpWp]: Trace formula consists of 21875 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-23 03:35:40,373 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:35:54,137 INFO L134 CoverageAnalysis]: Checked inductivity of 4601709 backedges. 192479 proven. 427 refuted. 0 times theorem prover too weak. 4408803 trivial. 0 not checked. [2021-11-23 03:35:54,138 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:36:42,427 INFO L134 CoverageAnalysis]: Checked inductivity of 4601709 backedges. 5740 proven. 67680 refuted. 0 times theorem prover too weak. 4528289 trivial. 0 not checked. [2021-11-23 03:36:42,427 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [868497756] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:36:42,427 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [780939509] [2021-11-23 03:36:42,431 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2021-11-23 03:36:42,432 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:36:42,432 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 03:36:42,432 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 03:36:42,440 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 17, 23] total 34 [2021-11-23 03:36:42,440 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [340461619] [2021-11-23 03:36:42,441 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 03:36:42,444 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-23 03:36:42,444 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:36:42,444 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-23 03:36:42,445 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=121, Invalid=1001, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 03:36:42,445 INFO L87 Difference]: Start difference. First operand 535 states and 1086 transitions. Second operand has 34 states, 33 states have (on average 3.8181818181818183) internal successors, (126), 34 states have internal predecessors, (126), 28 states have call successors, (39), 2 states have call predecessors, (39), 18 states have return successors, (52), 19 states have call predecessors, (52), 28 states have call successors, (52) [2021-11-23 03:36:44,162 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:36:44,162 INFO L93 Difference]: Finished difference Result 1254 states and 3100 transitions. [2021-11-23 03:36:44,162 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2021-11-23 03:36:44,162 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 33 states have (on average 3.8181818181818183) internal successors, (126), 34 states have internal predecessors, (126), 28 states have call successors, (39), 2 states have call predecessors, (39), 18 states have return successors, (52), 19 states have call predecessors, (52), 28 states have call successors, (52) Word has length 12292 [2021-11-23 03:36:44,163 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:36:44,178 INFO L225 Difference]: With dead ends: 1254 [2021-11-23 03:36:44,178 INFO L226 Difference]: Without dead ends: 731 [2021-11-23 03:36:44,186 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 24653 GetRequests, 24571 SyntacticMatches, 2 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1514 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=940, Invalid=5702, Unknown=0, NotChecked=0, Total=6642 [2021-11-23 03:36:44,187 INFO L933 BasicCegarLoop]: 43 mSDtfsCounter, 289 mSDsluCounter, 559 mSDsCounter, 0 mSdLazyCounter, 1660 mSolverCounterSat, 483 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 290 SdHoareTripleChecker+Valid, 584 SdHoareTripleChecker+Invalid, 2143 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 483 IncrementalHoareTripleChecker+Valid, 1660 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-23 03:36:44,187 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [290 Valid, 584 Invalid, 2143 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [483 Valid, 1660 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-23 03:36:44,188 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 731 states. [2021-11-23 03:36:44,253 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 731 to 612. [2021-11-23 03:36:44,254 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 612 states, 431 states have (on average 1.0394431554524362) internal successors, (448), 424 states have internal predecessors, (448), 131 states have call successors, (131), 98 states have call predecessors, (131), 49 states have return successors, (727), 89 states have call predecessors, (727), 131 states have call successors, (727) [2021-11-23 03:36:44,260 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 612 states to 612 states and 1306 transitions. [2021-11-23 03:36:44,261 INFO L78 Accepts]: Start accepts. Automaton has 612 states and 1306 transitions. Word has length 12292 [2021-11-23 03:36:44,262 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:36:44,262 INFO L470 AbstractCegarLoop]: Abstraction has 612 states and 1306 transitions. [2021-11-23 03:36:44,262 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 33 states have (on average 3.8181818181818183) internal successors, (126), 34 states have internal predecessors, (126), 28 states have call successors, (39), 2 states have call predecessors, (39), 18 states have return successors, (52), 19 states have call predecessors, (52), 28 states have call successors, (52) [2021-11-23 03:36:44,262 INFO L276 IsEmpty]: Start isEmpty. Operand 612 states and 1306 transitions. [2021-11-23 03:36:44,520 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7174 [2021-11-23 03:36:44,520 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:36:44,523 INFO L514 BasicCegarLoop]: trace histogram [533, 533, 520, 520, 427, 425, 266, 266, 266, 266, 266, 266, 266, 260, 260, 260, 260, 260, 260, 260, 165, 161, 108, 93, 1, 1, 1, 1, 1, 1] [2021-11-23 03:36:44,566 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Ended with exit code 0 [2021-11-23 03:36:44,724 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2021-11-23 03:36:44,725 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:36:44,725 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:36:44,726 INFO L85 PathProgramCache]: Analyzing trace with hash -1086443063, now seen corresponding path program 19 times [2021-11-23 03:36:44,726 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:36:44,726 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1258056233] [2021-11-23 03:36:44,727 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:36:44,727 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:36:48,036 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:36:51,116 INFO L134 CoverageAnalysis]: Checked inductivity of 1563583 backedges. 9191 proven. 37519 refuted. 0 times theorem prover too weak. 1516873 trivial. 0 not checked. [2021-11-23 03:36:51,116 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:36:51,116 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1258056233] [2021-11-23 03:36:51,116 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1258056233] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:36:51,116 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [199376096] [2021-11-23 03:36:51,117 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 03:36:51,117 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:36:51,117 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:36:51,117 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:36:51,118 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2021-11-23 03:36:53,401 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:36:53,453 INFO L263 TraceCheckSpWp]: Trace formula consists of 15952 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-23 03:36:53,503 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:37:01,204 INFO L134 CoverageAnalysis]: Checked inductivity of 1563583 backedges. 3839 proven. 37362 refuted. 0 times theorem prover too weak. 1522382 trivial. 0 not checked. [2021-11-23 03:37:01,204 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:37:31,740 INFO L134 CoverageAnalysis]: Checked inductivity of 1563583 backedges. 3839 proven. 37482 refuted. 0 times theorem prover too weak. 1522262 trivial. 0 not checked. [2021-11-23 03:37:31,741 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [199376096] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:37:31,741 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1129531594] [2021-11-23 03:37:31,744 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2021-11-23 03:37:31,744 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:37:31,744 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 03:37:31,744 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 03:37:31,749 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 19, 31] total 51 [2021-11-23 03:37:31,749 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1950246571] [2021-11-23 03:37:31,749 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 03:37:31,751 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2021-11-23 03:37:31,751 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:37:31,752 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2021-11-23 03:37:31,752 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=271, Invalid=2279, Unknown=0, NotChecked=0, Total=2550 [2021-11-23 03:37:31,752 INFO L87 Difference]: Start difference. First operand 612 states and 1306 transitions. Second operand has 51 states, 49 states have (on average 3.2653061224489797) internal successors, (160), 51 states have internal predecessors, (160), 43 states have call successors, (52), 1 states have call predecessors, (52), 27 states have return successors, (74), 30 states have call predecessors, (74), 43 states have call successors, (74) [2021-11-23 03:37:34,875 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:37:34,875 INFO L93 Difference]: Finished difference Result 1501 states and 3866 transitions. [2021-11-23 03:37:34,876 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 91 states. [2021-11-23 03:37:34,876 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 49 states have (on average 3.2653061224489797) internal successors, (160), 51 states have internal predecessors, (160), 43 states have call successors, (52), 1 states have call predecessors, (52), 27 states have return successors, (74), 30 states have call predecessors, (74), 43 states have call successors, (74) Word has length 7173 [2021-11-23 03:37:34,877 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:37:34,893 INFO L225 Difference]: With dead ends: 1501 [2021-11-23 03:37:34,893 INFO L226 Difference]: Without dead ends: 822 [2021-11-23 03:37:34,907 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 14450 GetRequests, 14328 SyntacticMatches, 0 SemanticMatches, 122 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4097 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1902, Invalid=13350, Unknown=0, NotChecked=0, Total=15252 [2021-11-23 03:37:34,907 INFO L933 BasicCegarLoop]: 59 mSDtfsCounter, 639 mSDsluCounter, 937 mSDsCounter, 0 mSdLazyCounter, 3098 mSolverCounterSat, 1529 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 640 SdHoareTripleChecker+Valid, 974 SdHoareTripleChecker+Invalid, 4627 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1529 IncrementalHoareTripleChecker+Valid, 3098 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.8s IncrementalHoareTripleChecker+Time [2021-11-23 03:37:34,908 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [640 Valid, 974 Invalid, 4627 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1529 Valid, 3098 Invalid, 0 Unknown, 0 Unchecked, 1.8s Time] [2021-11-23 03:37:34,909 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 822 states. [2021-11-23 03:37:34,976 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 822 to 577. [2021-11-23 03:37:34,977 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 577 states, 411 states have (on average 1.0364963503649636) internal successors, (426), 403 states have internal predecessors, (426), 128 states have call successors, (128), 101 states have call predecessors, (128), 37 states have return successors, (416), 72 states have call predecessors, (416), 128 states have call successors, (416) [2021-11-23 03:37:34,981 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 577 states to 577 states and 970 transitions. [2021-11-23 03:37:34,982 INFO L78 Accepts]: Start accepts. Automaton has 577 states and 970 transitions. Word has length 7173 [2021-11-23 03:37:34,983 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:37:34,983 INFO L470 AbstractCegarLoop]: Abstraction has 577 states and 970 transitions. [2021-11-23 03:37:34,983 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 49 states have (on average 3.2653061224489797) internal successors, (160), 51 states have internal predecessors, (160), 43 states have call successors, (52), 1 states have call predecessors, (52), 27 states have return successors, (74), 30 states have call predecessors, (74), 43 states have call successors, (74) [2021-11-23 03:37:34,983 INFO L276 IsEmpty]: Start isEmpty. Operand 577 states and 970 transitions. [2021-11-23 03:37:44,968 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42593 [2021-11-23 03:37:44,968 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:37:44,974 INFO L514 BasicCegarLoop]: trace histogram [3155, 3155, 3100, 3100, 2543, 2516, 1577, 1577, 1577, 1577, 1577, 1577, 1577, 1550, 1550, 1550, 1550, 1550, 1550, 1550, 993, 939, 612, 584, 1, 1, 1, 1, 1, 1] [2021-11-23 03:37:45,024 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2021-11-23 03:37:45,189 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f84c23f-c1aa-443b-b55a-3d9d50a0a4ea/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2021-11-23 03:37:45,189 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:37:45,191 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:37:45,194 INFO L85 PathProgramCache]: Analyzing trace with hash 738563780, now seen corresponding path program 20 times [2021-11-23 03:37:45,195 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:37:45,195 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1799507013] [2021-11-23 03:37:45,196 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:37:45,196 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms