./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/recursive-simple/fibo_2calls_20-1.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 8393723b Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6be86799-7197-40e2-91c6-b142cac049a9/bin/utaipan-I9t0OCRTmS/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6be86799-7197-40e2-91c6-b142cac049a9/bin/utaipan-I9t0OCRTmS/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6be86799-7197-40e2-91c6-b142cac049a9/bin/utaipan-I9t0OCRTmS/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6be86799-7197-40e2-91c6-b142cac049a9/bin/utaipan-I9t0OCRTmS/config/TaipanReach.xml -i ../../sv-benchmarks/c/recursive-simple/fibo_2calls_20-1.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6be86799-7197-40e2-91c6-b142cac049a9/bin/utaipan-I9t0OCRTmS/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6be86799-7197-40e2-91c6-b142cac049a9/bin/utaipan-I9t0OCRTmS --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 0642f258b99d0be7a55bf1ef77240ba2f36dd3da56337cf262b8aebc4e0cc323 --- Real Ultimate output --- [0.001s][warning][os,container] Duplicate cpuset controllers detected. Picking /sys/fs/cgroup/cpuset, skipping /sys/fs/cgroup/cpuset. This is Ultimate 0.2.2-dev-8393723 [2022-11-19 07:48:40,688 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-19 07:48:40,691 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-19 07:48:40,721 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-19 07:48:40,724 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-19 07:48:40,729 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-19 07:48:40,732 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-19 07:48:40,743 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-19 07:48:40,748 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-19 07:48:40,749 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-19 07:48:40,750 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-19 07:48:40,752 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-19 07:48:40,753 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-19 07:48:40,757 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-19 07:48:40,758 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-19 07:48:40,760 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-19 07:48:40,762 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-19 07:48:40,769 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-19 07:48:40,771 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-19 07:48:40,773 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-19 07:48:40,777 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-19 07:48:40,779 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-19 07:48:40,780 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-19 07:48:40,782 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-19 07:48:40,787 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-19 07:48:40,792 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-19 07:48:40,792 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-19 07:48:40,793 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-19 07:48:40,795 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-19 07:48:40,796 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-19 07:48:40,796 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-19 07:48:40,797 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-19 07:48:40,799 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-19 07:48:40,801 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-19 07:48:40,803 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-19 07:48:40,803 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-19 07:48:40,804 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-19 07:48:40,804 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-19 07:48:40,805 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-19 07:48:40,806 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-19 07:48:40,806 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-19 07:48:40,807 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6be86799-7197-40e2-91c6-b142cac049a9/bin/utaipan-I9t0OCRTmS/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-19 07:48:40,857 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-19 07:48:40,858 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-19 07:48:40,858 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-19 07:48:40,859 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-19 07:48:40,860 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-19 07:48:40,860 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-19 07:48:40,860 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-19 07:48:40,860 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-19 07:48:40,861 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-19 07:48:40,861 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-19 07:48:40,862 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-19 07:48:40,862 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-19 07:48:40,863 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-19 07:48:40,863 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-19 07:48:40,863 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-19 07:48:40,863 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-19 07:48:40,864 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-19 07:48:40,864 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-19 07:48:40,865 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-19 07:48:40,865 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-19 07:48:40,865 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-19 07:48:40,865 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-19 07:48:40,866 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-19 07:48:40,867 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-19 07:48:40,868 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-19 07:48:40,868 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-19 07:48:40,868 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-19 07:48:40,868 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-19 07:48:40,869 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-19 07:48:40,869 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-19 07:48:40,869 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-19 07:48:40,870 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-19 07:48:40,870 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-19 07:48:40,870 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-19 07:48:40,871 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-19 07:48:40,871 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-19 07:48:40,871 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-19 07:48:40,871 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-19 07:48:40,871 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-19 07:48:40,872 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-19 07:48:40,872 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-19 07:48:40,872 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode 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_6be86799-7197-40e2-91c6-b142cac049a9/bin/utaipan-I9t0OCRTmS/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6be86799-7197-40e2-91c6-b142cac049a9/bin/utaipan-I9t0OCRTmS Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 0642f258b99d0be7a55bf1ef77240ba2f36dd3da56337cf262b8aebc4e0cc323 [2022-11-19 07:48:41,149 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-19 07:48:41,173 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-19 07:48:41,176 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-19 07:48:41,177 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-19 07:48:41,178 INFO L275 PluginConnector]: CDTParser initialized [2022-11-19 07:48:41,179 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6be86799-7197-40e2-91c6-b142cac049a9/bin/utaipan-I9t0OCRTmS/../../sv-benchmarks/c/recursive-simple/fibo_2calls_20-1.c [2022-11-19 07:48:41,263 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6be86799-7197-40e2-91c6-b142cac049a9/bin/utaipan-I9t0OCRTmS/data/d1c96a4be/a8835bfb1e0443eb86f008f527556f50/FLAG119f0e437 [2022-11-19 07:48:41,719 INFO L306 CDTParser]: Found 1 translation units. [2022-11-19 07:48:41,719 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6be86799-7197-40e2-91c6-b142cac049a9/sv-benchmarks/c/recursive-simple/fibo_2calls_20-1.c [2022-11-19 07:48:41,725 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6be86799-7197-40e2-91c6-b142cac049a9/bin/utaipan-I9t0OCRTmS/data/d1c96a4be/a8835bfb1e0443eb86f008f527556f50/FLAG119f0e437 [2022-11-19 07:48:42,109 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6be86799-7197-40e2-91c6-b142cac049a9/bin/utaipan-I9t0OCRTmS/data/d1c96a4be/a8835bfb1e0443eb86f008f527556f50 [2022-11-19 07:48:42,112 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-19 07:48:42,116 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-19 07:48:42,119 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-19 07:48:42,119 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-19 07:48:42,123 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-19 07:48:42,123 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 07:48:42" (1/1) ... [2022-11-19 07:48:42,126 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@744b1b9b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:48:42, skipping insertion in model container [2022-11-19 07:48:42,126 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 07:48:42" (1/1) ... [2022-11-19 07:48:42,134 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-19 07:48:42,149 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-19 07:48:42,361 WARN L234 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_6be86799-7197-40e2-91c6-b142cac049a9/sv-benchmarks/c/recursive-simple/fibo_2calls_20-1.c[951,964] [2022-11-19 07:48:42,365 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-19 07:48:42,374 INFO L203 MainTranslator]: Completed pre-run [2022-11-19 07:48:42,389 WARN L234 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_6be86799-7197-40e2-91c6-b142cac049a9/sv-benchmarks/c/recursive-simple/fibo_2calls_20-1.c[951,964] [2022-11-19 07:48:42,389 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-19 07:48:42,402 INFO L208 MainTranslator]: Completed translation [2022-11-19 07:48:42,403 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:48:42 WrapperNode [2022-11-19 07:48:42,403 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-19 07:48:42,404 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-19 07:48:42,404 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-19 07:48:42,405 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-19 07:48:42,412 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:48:42" (1/1) ... [2022-11-19 07:48:42,418 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:48:42" (1/1) ... [2022-11-19 07:48:42,434 INFO L138 Inliner]: procedures = 14, calls = 12, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 21 [2022-11-19 07:48:42,434 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-19 07:48:42,435 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-19 07:48:42,436 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-19 07:48:42,436 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-19 07:48:42,445 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:48:42" (1/1) ... [2022-11-19 07:48:42,445 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:48:42" (1/1) ... [2022-11-19 07:48:42,456 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:48:42" (1/1) ... [2022-11-19 07:48:42,457 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:48:42" (1/1) ... [2022-11-19 07:48:42,463 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:48:42" (1/1) ... [2022-11-19 07:48:42,466 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:48:42" (1/1) ... [2022-11-19 07:48:42,468 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:48:42" (1/1) ... [2022-11-19 07:48:42,469 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:48:42" (1/1) ... [2022-11-19 07:48:42,470 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-19 07:48:42,471 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-19 07:48:42,471 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-19 07:48:42,471 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-19 07:48:42,472 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:48:42" (1/1) ... [2022-11-19 07:48:42,480 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-19 07:48:42,496 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6be86799-7197-40e2-91c6-b142cac049a9/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:48:42,509 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6be86799-7197-40e2-91c6-b142cac049a9/bin/utaipan-I9t0OCRTmS/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-19 07:48:42,523 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6be86799-7197-40e2-91c6-b142cac049a9/bin/utaipan-I9t0OCRTmS/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-19 07:48:42,554 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-19 07:48:42,554 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-19 07:48:42,554 INFO L130 BoogieDeclarations]: Found specification of procedure fibo2 [2022-11-19 07:48:42,554 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo2 [2022-11-19 07:48:42,554 INFO L130 BoogieDeclarations]: Found specification of procedure fibo1 [2022-11-19 07:48:42,555 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo1 [2022-11-19 07:48:42,555 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-19 07:48:42,555 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-19 07:48:42,613 INFO L235 CfgBuilder]: Building ICFG [2022-11-19 07:48:42,615 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-19 07:48:42,746 INFO L276 CfgBuilder]: Performing block encoding [2022-11-19 07:48:42,762 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-19 07:48:42,762 INFO L300 CfgBuilder]: Removed 0 assume(true) statements. [2022-11-19 07:48:42,764 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 07:48:42 BoogieIcfgContainer [2022-11-19 07:48:42,764 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-19 07:48:42,767 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-19 07:48:42,767 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-19 07:48:42,770 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-19 07:48:42,770 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.11 07:48:42" (1/3) ... [2022-11-19 07:48:42,771 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@f2641cf and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 07:48:42, skipping insertion in model container [2022-11-19 07:48:42,771 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:48:42" (2/3) ... [2022-11-19 07:48:42,772 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@f2641cf and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 07:48:42, skipping insertion in model container [2022-11-19 07:48:42,772 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 07:48:42" (3/3) ... [2022-11-19 07:48:42,773 INFO L112 eAbstractionObserver]: Analyzing ICFG fibo_2calls_20-1.c [2022-11-19 07:48:42,790 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-19 07:48:42,790 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-19 07:48:42,843 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-19 07:48:42,853 INFO L357 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, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@3cfdd31f, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-19 07:48:42,855 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-11-19 07:48:42,859 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) [2022-11-19 07:48:42,868 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-11-19 07:48:42,868 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:48:42,869 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:48:42,870 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:48:42,883 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:48:42,883 INFO L85 PathProgramCache]: Analyzing trace with hash 2097990987, now seen corresponding path program 1 times [2022-11-19 07:48:42,893 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:48:42,895 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [608822764] [2022-11-19 07:48:42,895 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:48:42,895 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:48:43,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:48:43,159 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:48:43,160 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:48:43,161 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [608822764] [2022-11-19 07:48:43,161 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [608822764] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 07:48:43,162 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-19 07:48:43,162 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-19 07:48:43,164 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [466421586] [2022-11-19 07:48:43,164 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 07:48:43,168 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-19 07:48:43,169 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:48:43,196 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-19 07:48:43,197 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-19 07:48:43,199 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) [2022-11-19 07:48:43,286 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:48:43,286 INFO L93 Difference]: Finished difference Result 36 states and 44 transitions. [2022-11-19 07:48:43,288 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-19 07:48:43,289 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 [2022-11-19 07:48:43,290 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:48:43,297 INFO L225 Difference]: With dead ends: 36 [2022-11-19 07:48:43,298 INFO L226 Difference]: Without dead ends: 26 [2022-11-19 07:48:43,317 INFO L412 NwaCegarLoop]: 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 [2022-11-19 07:48:43,337 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 2 mSDsluCounter, 77 mSDsCounter, 0 mSdLazyCounter, 22 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 105 SdHoareTripleChecker+Invalid, 22 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 22 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-19 07:48:43,338 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 105 Invalid, 22 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 22 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-19 07:48:43,355 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2022-11-19 07:48:43,403 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2022-11-19 07:48:43,404 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) [2022-11-19 07:48:43,406 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 33 transitions. [2022-11-19 07:48:43,407 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 33 transitions. Word has length 9 [2022-11-19 07:48:43,407 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:48:43,408 INFO L495 AbstractCegarLoop]: Abstraction has 26 states and 33 transitions. [2022-11-19 07:48:43,408 INFO L496 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) [2022-11-19 07:48:43,408 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 33 transitions. [2022-11-19 07:48:43,409 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2022-11-19 07:48:43,410 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:48:43,410 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:48:43,410 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-11-19 07:48:43,410 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:48:43,411 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:48:43,411 INFO L85 PathProgramCache]: Analyzing trace with hash 1328370967, now seen corresponding path program 1 times [2022-11-19 07:48:43,412 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:48:43,412 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1406842300] [2022-11-19 07:48:43,412 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:48:43,412 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:48:43,422 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:48:43,481 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:48:43,481 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:48:43,482 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1406842300] [2022-11-19 07:48:43,482 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1406842300] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 07:48:43,482 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-19 07:48:43,482 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-19 07:48:43,483 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [782892325] [2022-11-19 07:48:43,483 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 07:48:43,486 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-19 07:48:43,486 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:48:43,487 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-19 07:48:43,490 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-19 07:48:43,491 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) [2022-11-19 07:48:43,539 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:48:43,539 INFO L93 Difference]: Finished difference Result 32 states and 40 transitions. [2022-11-19 07:48:43,540 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-19 07:48:43,540 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 [2022-11-19 07:48:43,540 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:48:43,541 INFO L225 Difference]: With dead ends: 32 [2022-11-19 07:48:43,542 INFO L226 Difference]: Without dead ends: 28 [2022-11-19 07:48:43,542 INFO L412 NwaCegarLoop]: 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 [2022-11-19 07:48:43,544 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 0 mSDsluCounter, 85 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 116 SdHoareTripleChecker+Invalid, 14 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 14 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-19 07:48:43,545 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 116 Invalid, 14 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 14 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-19 07:48:43,546 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2022-11-19 07:48:43,551 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 26. [2022-11-19 07:48:43,552 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) [2022-11-19 07:48:43,553 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 33 transitions. [2022-11-19 07:48:43,553 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 33 transitions. Word has length 10 [2022-11-19 07:48:43,554 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:48:43,554 INFO L495 AbstractCegarLoop]: Abstraction has 26 states and 33 transitions. [2022-11-19 07:48:43,554 INFO L496 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) [2022-11-19 07:48:43,554 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 33 transitions. [2022-11-19 07:48:43,555 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2022-11-19 07:48:43,556 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:48:43,556 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:48:43,556 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-11-19 07:48:43,556 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:48:43,557 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:48:43,557 INFO L85 PathProgramCache]: Analyzing trace with hash -1296553538, now seen corresponding path program 1 times [2022-11-19 07:48:43,557 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:48:43,558 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [246066030] [2022-11-19 07:48:43,558 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:48:43,558 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:48:43,582 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:48:43,801 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 07:48:43,802 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:48:43,802 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [246066030] [2022-11-19 07:48:43,802 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [246066030] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:48:43,803 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1492325647] [2022-11-19 07:48:43,803 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:48:43,803 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:48:43,803 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6be86799-7197-40e2-91c6-b142cac049a9/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:48:43,810 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6be86799-7197-40e2-91c6-b142cac049a9/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:48:43,819 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6be86799-7197-40e2-91c6-b142cac049a9/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-19 07:48:43,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:48:43,877 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 6 conjunts are in the unsatisfiable core [2022-11-19 07:48:43,883 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:48:43,977 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 07:48:43,978 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:48:44,288 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 07:48:44,291 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1492325647] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:48:44,296 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [902668081] [2022-11-19 07:48:44,318 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2022-11-19 07:48:44,319 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:48:44,325 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:48:44,330 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:48:44,331 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:48:44,474 INFO L197 IcfgInterpreter]: Interpreting procedure fibo1 with input of size 39 for LOIs [2022-11-19 07:48:44,553 INFO L197 IcfgInterpreter]: Interpreting procedure fibo2 with input of size 38 for LOIs [2022-11-19 07:48:44,562 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:48:44,877 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [902668081] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 07:48:44,877 INFO L184 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:48:44,878 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6, 7, 7] total 17 [2022-11-19 07:48:44,879 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [181168714] [2022-11-19 07:48:44,879 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 07:48:44,880 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-11-19 07:48:44,881 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:48:44,882 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-11-19 07:48:44,884 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=224, Unknown=0, NotChecked=0, Total=272 [2022-11-19 07:48:44,885 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) [2022-11-19 07:48:45,057 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:48:45,057 INFO L93 Difference]: Finished difference Result 68 states and 91 transitions. [2022-11-19 07:48:45,058 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-19 07:48:45,058 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 [2022-11-19 07:48:45,058 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:48:45,060 INFO L225 Difference]: With dead ends: 68 [2022-11-19 07:48:45,060 INFO L226 Difference]: Without dead ends: 44 [2022-11-19 07:48:45,061 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 52 SyntacticMatches, 4 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 53 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=48, Invalid=224, Unknown=0, NotChecked=0, Total=272 [2022-11-19 07:48:45,066 INFO L413 NwaCegarLoop]: 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 [2022-11-19 07:48:45,067 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [23 Valid, 110 Invalid, 74 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 69 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-19 07:48:45,069 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2022-11-19 07:48:45,084 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 42. [2022-11-19 07:48:45,085 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) [2022-11-19 07:48:45,086 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 50 transitions. [2022-11-19 07:48:45,088 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 50 transitions. Word has length 22 [2022-11-19 07:48:45,088 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:48:45,089 INFO L495 AbstractCegarLoop]: Abstraction has 42 states and 50 transitions. [2022-11-19 07:48:45,089 INFO L496 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) [2022-11-19 07:48:45,090 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 50 transitions. [2022-11-19 07:48:45,093 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-11-19 07:48:45,093 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:48:45,093 INFO L195 NwaCegarLoop]: 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] [2022-11-19 07:48:45,104 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6be86799-7197-40e2-91c6-b142cac049a9/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-19 07:48:45,294 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6be86799-7197-40e2-91c6-b142cac049a9/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:48:45,294 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:48:45,295 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:48:45,295 INFO L85 PathProgramCache]: Analyzing trace with hash -28918515, now seen corresponding path program 1 times [2022-11-19 07:48:45,295 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:48:45,296 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [397637973] [2022-11-19 07:48:45,296 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:48:45,298 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:48:45,325 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:48:45,423 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 5 proven. 5 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-19 07:48:45,423 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:48:45,423 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [397637973] [2022-11-19 07:48:45,424 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [397637973] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:48:45,424 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1049610348] [2022-11-19 07:48:45,424 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:48:45,424 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:48:45,425 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6be86799-7197-40e2-91c6-b142cac049a9/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:48:45,426 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6be86799-7197-40e2-91c6-b142cac049a9/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:48:45,437 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6be86799-7197-40e2-91c6-b142cac049a9/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-19 07:48:45,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:48:45,489 INFO L263 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 8 conjunts are in the unsatisfiable core [2022-11-19 07:48:45,491 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:48:45,577 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2022-11-19 07:48:45,577 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:48:46,004 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-19 07:48:46,005 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1049610348] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:48:46,005 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2079194866] [2022-11-19 07:48:46,009 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-11-19 07:48:46,009 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:48:46,010 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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) [2022-11-19 07:48:46,013 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:48:46,013 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 8, 9] total 14 [2022-11-19 07:48:46,014 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2048927715] [2022-11-19 07:48:46,014 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:48:46,016 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-11-19 07:48:46,017 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:48:46,017 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-11-19 07:48:46,018 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2022-11-19 07:48:46,018 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) [2022-11-19 07:48:46,266 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:48:46,266 INFO L93 Difference]: Finished difference Result 85 states and 121 transitions. [2022-11-19 07:48:46,267 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-11-19 07:48:46,267 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 [2022-11-19 07:48:46,267 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:48:46,269 INFO L225 Difference]: With dead ends: 85 [2022-11-19 07:48:46,269 INFO L226 Difference]: Without dead ends: 53 [2022-11-19 07:48:46,270 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 63 SyntacticMatches, 3 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=75, Invalid=305, Unknown=0, NotChecked=0, Total=380 [2022-11-19 07:48:46,270 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 39 mSDsluCounter, 76 mSDsCounter, 0 mSdLazyCounter, 186 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 94 SdHoareTripleChecker+Invalid, 214 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 186 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-19 07:48:46,271 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [44 Valid, 94 Invalid, 214 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 186 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-19 07:48:46,272 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2022-11-19 07:48:46,281 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 44. [2022-11-19 07:48:46,282 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) [2022-11-19 07:48:46,283 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 53 transitions. [2022-11-19 07:48:46,283 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 53 transitions. Word has length 35 [2022-11-19 07:48:46,283 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:48:46,283 INFO L495 AbstractCegarLoop]: Abstraction has 44 states and 53 transitions. [2022-11-19 07:48:46,284 INFO L496 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) [2022-11-19 07:48:46,284 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 53 transitions. [2022-11-19 07:48:46,285 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2022-11-19 07:48:46,285 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:48:46,285 INFO L195 NwaCegarLoop]: 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] [2022-11-19 07:48:46,295 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6be86799-7197-40e2-91c6-b142cac049a9/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-19 07:48:46,495 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6be86799-7197-40e2-91c6-b142cac049a9/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:48:46,496 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:48:46,496 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:48:46,496 INFO L85 PathProgramCache]: Analyzing trace with hash -243412115, now seen corresponding path program 1 times [2022-11-19 07:48:46,497 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:48:46,497 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [448209404] [2022-11-19 07:48:46,497 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:48:46,497 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:48:46,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:48:46,648 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-19 07:48:46,648 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:48:46,648 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [448209404] [2022-11-19 07:48:46,648 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [448209404] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:48:46,649 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [390848943] [2022-11-19 07:48:46,649 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:48:46,649 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:48:46,649 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6be86799-7197-40e2-91c6-b142cac049a9/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:48:46,650 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6be86799-7197-40e2-91c6-b142cac049a9/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:48:46,661 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6be86799-7197-40e2-91c6-b142cac049a9/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-19 07:48:46,716 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:48:46,717 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 8 conjunts are in the unsatisfiable core [2022-11-19 07:48:46,720 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:48:46,805 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-19 07:48:46,806 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:48:47,183 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 11 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-19 07:48:47,183 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [390848943] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:48:47,183 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [723057929] [2022-11-19 07:48:47,191 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-11-19 07:48:47,191 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:48:47,192 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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) [2022-11-19 07:48:47,193 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:48:47,194 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 9] total 18 [2022-11-19 07:48:47,195 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1989630797] [2022-11-19 07:48:47,195 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:48:47,195 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-11-19 07:48:47,196 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:48:47,196 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-11-19 07:48:47,197 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2022-11-19 07:48:47,197 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) [2022-11-19 07:48:47,760 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:48:47,760 INFO L93 Difference]: Finished difference Result 121 states and 203 transitions. [2022-11-19 07:48:47,760 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-11-19 07:48:47,761 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 [2022-11-19 07:48:47,761 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:48:47,763 INFO L225 Difference]: With dead ends: 121 [2022-11-19 07:48:47,763 INFO L226 Difference]: Without dead ends: 77 [2022-11-19 07:48:47,764 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 68 SyntacticMatches, 3 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 125 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=142, Invalid=670, Unknown=0, NotChecked=0, Total=812 [2022-11-19 07:48:47,765 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 72 mSDsluCounter, 170 mSDsCounter, 0 mSdLazyCounter, 484 mSolverCounterSat, 95 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 76 SdHoareTripleChecker+Valid, 198 SdHoareTripleChecker+Invalid, 579 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 95 IncrementalHoareTripleChecker+Valid, 484 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-19 07:48:47,765 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [76 Valid, 198 Invalid, 579 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [95 Valid, 484 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-19 07:48:47,766 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2022-11-19 07:48:47,780 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 63. [2022-11-19 07:48:47,780 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) [2022-11-19 07:48:47,782 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 91 transitions. [2022-11-19 07:48:47,782 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 91 transitions. Word has length 36 [2022-11-19 07:48:47,782 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:48:47,782 INFO L495 AbstractCegarLoop]: Abstraction has 63 states and 91 transitions. [2022-11-19 07:48:47,783 INFO L496 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) [2022-11-19 07:48:47,783 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 91 transitions. [2022-11-19 07:48:47,785 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2022-11-19 07:48:47,785 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:48:47,785 INFO L195 NwaCegarLoop]: 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] [2022-11-19 07:48:47,801 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6be86799-7197-40e2-91c6-b142cac049a9/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-19 07:48:47,990 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6be86799-7197-40e2-91c6-b142cac049a9/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:48:47,991 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:48:47,991 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:48:47,991 INFO L85 PathProgramCache]: Analyzing trace with hash 403750738, now seen corresponding path program 1 times [2022-11-19 07:48:47,991 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:48:47,991 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1939847831] [2022-11-19 07:48:47,992 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:48:47,992 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:48:48,008 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:48:48,114 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 12 proven. 12 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2022-11-19 07:48:48,115 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:48:48,115 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1939847831] [2022-11-19 07:48:48,115 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1939847831] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:48:48,115 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [254647514] [2022-11-19 07:48:48,115 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:48:48,116 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:48:48,116 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6be86799-7197-40e2-91c6-b142cac049a9/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:48:48,117 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6be86799-7197-40e2-91c6-b142cac049a9/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:48:48,138 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6be86799-7197-40e2-91c6-b142cac049a9/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-19 07:48:48,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:48:48,193 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 10 conjunts are in the unsatisfiable core [2022-11-19 07:48:48,195 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:48:48,292 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 4 proven. 23 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2022-11-19 07:48:48,292 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:48:48,860 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 4 proven. 28 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-19 07:48:48,860 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [254647514] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:48:48,860 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [426505485] [2022-11-19 07:48:48,862 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-11-19 07:48:48,862 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:48:48,863 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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) [2022-11-19 07:48:48,863 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:48:48,863 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9, 11] total 17 [2022-11-19 07:48:48,863 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1951329113] [2022-11-19 07:48:48,863 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:48:48,864 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-11-19 07:48:48,864 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:48:48,865 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-11-19 07:48:48,865 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2022-11-19 07:48:48,865 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) [2022-11-19 07:48:49,129 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:48:49,129 INFO L93 Difference]: Finished difference Result 119 states and 203 transitions. [2022-11-19 07:48:49,130 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-11-19 07:48:49,130 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 [2022-11-19 07:48:49,130 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:48:49,132 INFO L225 Difference]: With dead ends: 119 [2022-11-19 07:48:49,132 INFO L226 Difference]: Without dead ends: 97 [2022-11-19 07:48:49,133 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 91 SyntacticMatches, 4 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 108 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=115, Invalid=437, Unknown=0, NotChecked=0, Total=552 [2022-11-19 07:48:49,134 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 58 mSDsluCounter, 78 mSDsCounter, 0 mSdLazyCounter, 180 mSolverCounterSat, 67 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 70 SdHoareTripleChecker+Valid, 94 SdHoareTripleChecker+Invalid, 247 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 67 IncrementalHoareTripleChecker+Valid, 180 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-19 07:48:49,134 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [70 Valid, 94 Invalid, 247 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [67 Valid, 180 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-19 07:48:49,135 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2022-11-19 07:48:49,152 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 72. [2022-11-19 07:48:49,152 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) [2022-11-19 07:48:49,163 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 105 transitions. [2022-11-19 07:48:49,164 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 105 transitions. Word has length 50 [2022-11-19 07:48:49,164 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:48:49,167 INFO L495 AbstractCegarLoop]: Abstraction has 72 states and 105 transitions. [2022-11-19 07:48:49,168 INFO L496 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) [2022-11-19 07:48:49,168 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 105 transitions. [2022-11-19 07:48:49,170 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2022-11-19 07:48:49,171 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:48:49,172 INFO L195 NwaCegarLoop]: 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] [2022-11-19 07:48:49,177 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6be86799-7197-40e2-91c6-b142cac049a9/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-19 07:48:49,373 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6be86799-7197-40e2-91c6-b142cac049a9/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2022-11-19 07:48:49,373 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:48:49,373 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:48:49,373 INFO L85 PathProgramCache]: Analyzing trace with hash 1766289300, now seen corresponding path program 1 times [2022-11-19 07:48:49,374 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:48:49,374 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1550498850] [2022-11-19 07:48:49,374 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:48:49,374 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:48:49,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:48:49,615 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 39 proven. 42 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2022-11-19 07:48:49,615 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:48:49,615 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1550498850] [2022-11-19 07:48:49,615 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1550498850] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:48:49,615 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1221213364] [2022-11-19 07:48:49,615 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:48:49,616 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:48:49,616 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6be86799-7197-40e2-91c6-b142cac049a9/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:48:49,617 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6be86799-7197-40e2-91c6-b142cac049a9/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:48:49,642 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6be86799-7197-40e2-91c6-b142cac049a9/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-19 07:48:49,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:48:49,719 INFO L263 TraceCheckSpWp]: Trace formula consists of 201 conjuncts, 12 conjunts are in the unsatisfiable core [2022-11-19 07:48:49,722 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:48:49,854 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 12 proven. 71 refuted. 0 times theorem prover too weak. 62 trivial. 0 not checked. [2022-11-19 07:48:49,854 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:48:50,780 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 12 proven. 81 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2022-11-19 07:48:50,780 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1221213364] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:48:50,780 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [312668708] [2022-11-19 07:48:50,783 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-11-19 07:48:50,783 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:48:50,783 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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) [2022-11-19 07:48:50,784 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:48:50,784 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 13] total 23 [2022-11-19 07:48:50,785 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [739915194] [2022-11-19 07:48:50,785 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:48:50,786 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2022-11-19 07:48:50,786 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:48:50,786 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2022-11-19 07:48:50,787 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=439, Unknown=0, NotChecked=0, Total=506 [2022-11-19 07:48:50,787 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) [2022-11-19 07:48:51,665 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:48:51,665 INFO L93 Difference]: Finished difference Result 204 states and 411 transitions. [2022-11-19 07:48:51,666 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-11-19 07:48:51,666 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 [2022-11-19 07:48:51,666 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:48:51,669 INFO L225 Difference]: With dead ends: 204 [2022-11-19 07:48:51,669 INFO L226 Difference]: Without dead ends: 115 [2022-11-19 07:48:51,671 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 190 GetRequests, 147 SyntacticMatches, 5 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 252 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=263, Invalid=1297, Unknown=0, NotChecked=0, Total=1560 [2022-11-19 07:48:51,672 INFO L413 NwaCegarLoop]: 35 mSDtfsCounter, 138 mSDsluCounter, 232 mSDsCounter, 0 mSdLazyCounter, 758 mSolverCounterSat, 164 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 139 SdHoareTripleChecker+Valid, 267 SdHoareTripleChecker+Invalid, 922 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 164 IncrementalHoareTripleChecker+Valid, 758 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-19 07:48:51,672 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [139 Valid, 267 Invalid, 922 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [164 Valid, 758 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-19 07:48:51,673 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2022-11-19 07:48:51,689 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 98. [2022-11-19 07:48:51,689 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) [2022-11-19 07:48:51,691 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 144 transitions. [2022-11-19 07:48:51,691 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 144 transitions. Word has length 79 [2022-11-19 07:48:51,691 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:48:51,691 INFO L495 AbstractCegarLoop]: Abstraction has 98 states and 144 transitions. [2022-11-19 07:48:51,692 INFO L496 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) [2022-11-19 07:48:51,692 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 144 transitions. [2022-11-19 07:48:51,695 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2022-11-19 07:48:51,696 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:48:51,696 INFO L195 NwaCegarLoop]: 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] [2022-11-19 07:48:51,706 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6be86799-7197-40e2-91c6-b142cac049a9/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-19 07:48:51,902 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6be86799-7197-40e2-91c6-b142cac049a9/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2022-11-19 07:48:51,902 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:48:51,902 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:48:51,903 INFO L85 PathProgramCache]: Analyzing trace with hash -346616466, now seen corresponding path program 1 times [2022-11-19 07:48:51,903 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:48:51,903 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [113789013] [2022-11-19 07:48:51,903 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:48:51,903 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:48:51,939 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:48:52,078 INFO L134 CoverageAnalysis]: Checked inductivity of 424 backedges. 39 proven. 92 refuted. 0 times theorem prover too weak. 293 trivial. 0 not checked. [2022-11-19 07:48:52,079 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:48:52,079 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [113789013] [2022-11-19 07:48:52,079 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [113789013] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:48:52,079 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1601276726] [2022-11-19 07:48:52,079 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:48:52,079 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:48:52,079 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6be86799-7197-40e2-91c6-b142cac049a9/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:48:52,080 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6be86799-7197-40e2-91c6-b142cac049a9/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:48:52,095 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6be86799-7197-40e2-91c6-b142cac049a9/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-19 07:48:52,184 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:48:52,186 INFO L263 TraceCheckSpWp]: Trace formula consists of 315 conjuncts, 14 conjunts are in the unsatisfiable core [2022-11-19 07:48:52,190 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:48:52,338 INFO L134 CoverageAnalysis]: Checked inductivity of 424 backedges. 29 proven. 172 refuted. 0 times theorem prover too weak. 223 trivial. 0 not checked. [2022-11-19 07:48:52,338 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:48:53,665 INFO L134 CoverageAnalysis]: Checked inductivity of 424 backedges. 29 proven. 186 refuted. 0 times theorem prover too weak. 209 trivial. 0 not checked. [2022-11-19 07:48:53,665 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1601276726] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:48:53,666 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [896706493] [2022-11-19 07:48:53,669 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-11-19 07:48:53,669 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:48:53,670 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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) [2022-11-19 07:48:53,671 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:48:53,671 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 11, 15] total 20 [2022-11-19 07:48:53,672 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1707010194] [2022-11-19 07:48:53,672 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:48:53,673 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-11-19 07:48:53,673 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:48:53,674 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-11-19 07:48:53,674 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=316, Unknown=0, NotChecked=0, Total=380 [2022-11-19 07:48:53,676 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) [2022-11-19 07:48:54,030 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:48:54,030 INFO L93 Difference]: Finished difference Result 191 states and 315 transitions. [2022-11-19 07:48:54,031 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-11-19 07:48:54,031 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 [2022-11-19 07:48:54,031 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:48:54,033 INFO L225 Difference]: With dead ends: 191 [2022-11-19 07:48:54,033 INFO L226 Difference]: Without dead ends: 103 [2022-11-19 07:48:54,034 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 274 GetRequests, 241 SyntacticMatches, 6 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 138 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=152, Invalid=660, Unknown=0, NotChecked=0, Total=812 [2022-11-19 07:48:54,035 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 86 mSDsluCounter, 125 mSDsCounter, 0 mSdLazyCounter, 311 mSolverCounterSat, 71 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 94 SdHoareTripleChecker+Valid, 143 SdHoareTripleChecker+Invalid, 382 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 71 IncrementalHoareTripleChecker+Valid, 311 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-19 07:48:54,035 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [94 Valid, 143 Invalid, 382 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [71 Valid, 311 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-19 07:48:54,035 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2022-11-19 07:48:54,058 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 100. [2022-11-19 07:48:54,059 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) [2022-11-19 07:48:54,062 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 143 transitions. [2022-11-19 07:48:54,062 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 143 transitions. Word has length 130 [2022-11-19 07:48:54,064 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:48:54,064 INFO L495 AbstractCegarLoop]: Abstraction has 100 states and 143 transitions. [2022-11-19 07:48:54,064 INFO L496 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) [2022-11-19 07:48:54,065 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 143 transitions. [2022-11-19 07:48:54,071 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2022-11-19 07:48:54,071 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:48:54,072 INFO L195 NwaCegarLoop]: 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] [2022-11-19 07:48:54,082 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6be86799-7197-40e2-91c6-b142cac049a9/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-11-19 07:48:54,277 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6be86799-7197-40e2-91c6-b142cac049a9/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:48:54,277 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:48:54,277 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:48:54,277 INFO L85 PathProgramCache]: Analyzing trace with hash 2089532945, now seen corresponding path program 2 times [2022-11-19 07:48:54,278 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:48:54,278 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [252680137] [2022-11-19 07:48:54,278 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:48:54,278 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:48:54,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:48:54,504 INFO L134 CoverageAnalysis]: Checked inductivity of 352 backedges. 37 proven. 111 refuted. 0 times theorem prover too weak. 204 trivial. 0 not checked. [2022-11-19 07:48:54,505 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:48:54,505 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [252680137] [2022-11-19 07:48:54,505 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [252680137] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:48:54,505 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1034648050] [2022-11-19 07:48:54,506 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 07:48:54,506 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:48:54,506 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6be86799-7197-40e2-91c6-b142cac049a9/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:48:54,507 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6be86799-7197-40e2-91c6-b142cac049a9/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:48:54,515 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6be86799-7197-40e2-91c6-b142cac049a9/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-19 07:48:54,605 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-11-19 07:48:54,605 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:48:54,606 INFO L263 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 8 conjunts are in the unsatisfiable core [2022-11-19 07:48:54,609 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:48:54,661 INFO L134 CoverageAnalysis]: Checked inductivity of 352 backedges. 77 proven. 20 refuted. 0 times theorem prover too weak. 255 trivial. 0 not checked. [2022-11-19 07:48:54,661 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:48:55,101 INFO L134 CoverageAnalysis]: Checked inductivity of 352 backedges. 77 proven. 22 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2022-11-19 07:48:55,101 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1034648050] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:48:55,102 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1833369898] [2022-11-19 07:48:55,104 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-11-19 07:48:55,107 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:48:55,107 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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) [2022-11-19 07:48:55,108 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:48:55,108 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 8, 9] total 16 [2022-11-19 07:48:55,109 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1207688419] [2022-11-19 07:48:55,112 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:48:55,112 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-11-19 07:48:55,112 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:48:55,113 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-11-19 07:48:55,113 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=190, Unknown=0, NotChecked=0, Total=240 [2022-11-19 07:48:55,113 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) [2022-11-19 07:48:55,378 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:48:55,379 INFO L93 Difference]: Finished difference Result 132 states and 213 transitions. [2022-11-19 07:48:55,379 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-11-19 07:48:55,379 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 [2022-11-19 07:48:55,380 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:48:55,381 INFO L225 Difference]: With dead ends: 132 [2022-11-19 07:48:55,381 INFO L226 Difference]: Without dead ends: 118 [2022-11-19 07:48:55,382 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 254 GetRequests, 230 SyntacticMatches, 3 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 86 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=107, Invalid=399, Unknown=0, NotChecked=0, Total=506 [2022-11-19 07:48:55,383 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 29 mSDsluCounter, 113 mSDsCounter, 0 mSdLazyCounter, 275 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 129 SdHoareTripleChecker+Invalid, 303 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 275 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-19 07:48:55,384 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [35 Valid, 129 Invalid, 303 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 275 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-19 07:48:55,385 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2022-11-19 07:48:55,406 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 108. [2022-11-19 07:48:55,407 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) [2022-11-19 07:48:55,409 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 160 transitions. [2022-11-19 07:48:55,409 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 160 transitions. Word has length 118 [2022-11-19 07:48:55,410 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:48:55,411 INFO L495 AbstractCegarLoop]: Abstraction has 108 states and 160 transitions. [2022-11-19 07:48:55,411 INFO L496 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) [2022-11-19 07:48:55,411 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 160 transitions. [2022-11-19 07:48:55,420 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 188 [2022-11-19 07:48:55,421 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:48:55,421 INFO L195 NwaCegarLoop]: 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] [2022-11-19 07:48:55,432 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6be86799-7197-40e2-91c6-b142cac049a9/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-11-19 07:48:55,632 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6be86799-7197-40e2-91c6-b142cac049a9/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:48:55,633 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:48:55,633 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:48:55,633 INFO L85 PathProgramCache]: Analyzing trace with hash 1687293718, now seen corresponding path program 3 times [2022-11-19 07:48:55,633 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:48:55,634 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2137193629] [2022-11-19 07:48:55,634 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:48:55,634 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:48:55,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:48:55,926 INFO L134 CoverageAnalysis]: Checked inductivity of 931 backedges. 76 proven. 209 refuted. 0 times theorem prover too weak. 646 trivial. 0 not checked. [2022-11-19 07:48:55,927 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:48:55,927 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2137193629] [2022-11-19 07:48:55,927 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2137193629] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:48:55,927 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [295042365] [2022-11-19 07:48:55,927 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 07:48:55,927 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:48:55,928 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6be86799-7197-40e2-91c6-b142cac049a9/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:48:55,929 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6be86799-7197-40e2-91c6-b142cac049a9/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:48:55,932 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6be86799-7197-40e2-91c6-b142cac049a9/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-19 07:48:56,078 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 07:48:56,078 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:48:56,080 INFO L263 TraceCheckSpWp]: Trace formula consists of 332 conjuncts, 10 conjunts are in the unsatisfiable core [2022-11-19 07:48:56,083 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:48:56,147 INFO L134 CoverageAnalysis]: Checked inductivity of 931 backedges. 423 proven. 19 refuted. 0 times theorem prover too weak. 489 trivial. 0 not checked. [2022-11-19 07:48:56,147 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:48:57,067 INFO L134 CoverageAnalysis]: Checked inductivity of 931 backedges. 74 proven. 251 refuted. 0 times theorem prover too weak. 606 trivial. 0 not checked. [2022-11-19 07:48:57,068 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [295042365] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:48:57,068 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [350702522] [2022-11-19 07:48:57,070 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-11-19 07:48:57,071 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:48:57,071 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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) [2022-11-19 07:48:57,072 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:48:57,072 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 11] total 17 [2022-11-19 07:48:57,072 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [927593037] [2022-11-19 07:48:57,073 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:48:57,073 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-11-19 07:48:57,074 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:48:57,074 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-11-19 07:48:57,074 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=222, Unknown=0, NotChecked=0, Total=272 [2022-11-19 07:48:57,075 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) [2022-11-19 07:48:57,325 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:48:57,325 INFO L93 Difference]: Finished difference Result 213 states and 337 transitions. [2022-11-19 07:48:57,326 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-11-19 07:48:57,326 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 [2022-11-19 07:48:57,327 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:48:57,328 INFO L225 Difference]: With dead ends: 213 [2022-11-19 07:48:57,328 INFO L226 Difference]: Without dead ends: 113 [2022-11-19 07:48:57,329 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 390 GetRequests, 363 SyntacticMatches, 5 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 111 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=115, Invalid=437, Unknown=0, NotChecked=0, Total=552 [2022-11-19 07:48:57,330 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 43 mSDsluCounter, 126 mSDsCounter, 0 mSdLazyCounter, 236 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 151 SdHoareTripleChecker+Invalid, 265 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 236 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-19 07:48:57,330 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [44 Valid, 151 Invalid, 265 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 236 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-19 07:48:57,331 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2022-11-19 07:48:57,342 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 113. [2022-11-19 07:48:57,342 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) [2022-11-19 07:48:57,344 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 162 transitions. [2022-11-19 07:48:57,344 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 162 transitions. Word has length 187 [2022-11-19 07:48:57,344 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:48:57,344 INFO L495 AbstractCegarLoop]: Abstraction has 113 states and 162 transitions. [2022-11-19 07:48:57,345 INFO L496 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) [2022-11-19 07:48:57,345 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 162 transitions. [2022-11-19 07:48:57,347 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 189 [2022-11-19 07:48:57,348 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:48:57,348 INFO L195 NwaCegarLoop]: 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] [2022-11-19 07:48:57,355 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6be86799-7197-40e2-91c6-b142cac049a9/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-11-19 07:48:57,554 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6be86799-7197-40e2-91c6-b142cac049a9/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-11-19 07:48:57,554 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:48:57,554 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:48:57,554 INFO L85 PathProgramCache]: Analyzing trace with hash 317371732, now seen corresponding path program 1 times [2022-11-19 07:48:57,555 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:48:57,555 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1127800220] [2022-11-19 07:48:57,555 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:48:57,555 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:48:57,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:48:57,895 INFO L134 CoverageAnalysis]: Checked inductivity of 943 backedges. 45 proven. 299 refuted. 0 times theorem prover too weak. 599 trivial. 0 not checked. [2022-11-19 07:48:57,895 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:48:57,895 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1127800220] [2022-11-19 07:48:57,895 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1127800220] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:48:57,895 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1110939674] [2022-11-19 07:48:57,896 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:48:57,896 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:48:57,896 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6be86799-7197-40e2-91c6-b142cac049a9/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:48:57,897 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6be86799-7197-40e2-91c6-b142cac049a9/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:48:57,922 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6be86799-7197-40e2-91c6-b142cac049a9/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-11-19 07:48:58,040 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:48:58,042 INFO L263 TraceCheckSpWp]: Trace formula consists of 443 conjuncts, 14 conjunts are in the unsatisfiable core [2022-11-19 07:48:58,046 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:48:58,122 INFO L134 CoverageAnalysis]: Checked inductivity of 943 backedges. 45 proven. 299 refuted. 0 times theorem prover too weak. 599 trivial. 0 not checked. [2022-11-19 07:48:58,122 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:48:59,490 INFO L134 CoverageAnalysis]: Checked inductivity of 943 backedges. 45 proven. 315 refuted. 0 times theorem prover too weak. 583 trivial. 0 not checked. [2022-11-19 07:48:59,490 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1110939674] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:48:59,490 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [862121388] [2022-11-19 07:48:59,494 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-11-19 07:48:59,495 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:48:59,496 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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) [2022-11-19 07:48:59,497 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:48:59,497 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 15] total 18 [2022-11-19 07:48:59,498 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1413564471] [2022-11-19 07:48:59,498 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:48:59,500 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-11-19 07:48:59,500 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:48:59,500 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-11-19 07:48:59,501 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2022-11-19 07:48:59,501 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) [2022-11-19 07:48:59,745 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:48:59,746 INFO L93 Difference]: Finished difference Result 142 states and 227 transitions. [2022-11-19 07:48:59,746 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-11-19 07:48:59,746 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 [2022-11-19 07:48:59,748 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:48:59,749 INFO L225 Difference]: With dead ends: 142 [2022-11-19 07:48:59,750 INFO L226 Difference]: Without dead ends: 128 [2022-11-19 07:48:59,750 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 396 GetRequests, 368 SyntacticMatches, 6 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=112, Invalid=440, Unknown=0, NotChecked=0, Total=552 [2022-11-19 07:48:59,751 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 68 mSDsluCounter, 90 mSDsCounter, 0 mSdLazyCounter, 226 mSolverCounterSat, 52 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 82 SdHoareTripleChecker+Valid, 106 SdHoareTripleChecker+Invalid, 278 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 52 IncrementalHoareTripleChecker+Valid, 226 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-19 07:48:59,751 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [82 Valid, 106 Invalid, 278 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [52 Valid, 226 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-19 07:48:59,752 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2022-11-19 07:48:59,768 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 107. [2022-11-19 07:48:59,769 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) [2022-11-19 07:48:59,770 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 148 transitions. [2022-11-19 07:48:59,770 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 148 transitions. Word has length 188 [2022-11-19 07:48:59,771 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:48:59,771 INFO L495 AbstractCegarLoop]: Abstraction has 107 states and 148 transitions. [2022-11-19 07:48:59,771 INFO L496 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) [2022-11-19 07:48:59,771 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 148 transitions. [2022-11-19 07:48:59,776 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 240 [2022-11-19 07:48:59,776 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:48:59,776 INFO L195 NwaCegarLoop]: 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] [2022-11-19 07:48:59,787 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6be86799-7197-40e2-91c6-b142cac049a9/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-11-19 07:48:59,982 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6be86799-7197-40e2-91c6-b142cac049a9/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2022-11-19 07:48:59,982 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:48:59,982 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:48:59,983 INFO L85 PathProgramCache]: Analyzing trace with hash 384777542, now seen corresponding path program 4 times [2022-11-19 07:48:59,983 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:48:59,983 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [105602131] [2022-11-19 07:48:59,983 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:48:59,983 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:49:00,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:49:00,558 INFO L134 CoverageAnalysis]: Checked inductivity of 1569 backedges. 279 proven. 371 refuted. 0 times theorem prover too weak. 919 trivial. 0 not checked. [2022-11-19 07:49:00,558 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:49:00,558 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [105602131] [2022-11-19 07:49:00,558 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [105602131] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:49:00,559 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [59267780] [2022-11-19 07:49:00,559 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 07:49:00,559 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:49:00,559 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6be86799-7197-40e2-91c6-b142cac049a9/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:49:00,560 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6be86799-7197-40e2-91c6-b142cac049a9/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:49:00,594 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6be86799-7197-40e2-91c6-b142cac049a9/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-11-19 07:49:00,742 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:49:00,744 INFO L263 TraceCheckSpWp]: Trace formula consists of 557 conjuncts, 16 conjunts are in the unsatisfiable core [2022-11-19 07:49:00,749 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:49:00,934 INFO L134 CoverageAnalysis]: Checked inductivity of 1569 backedges. 85 proven. 439 refuted. 0 times theorem prover too weak. 1045 trivial. 0 not checked. [2022-11-19 07:49:00,935 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:49:03,098 INFO L134 CoverageAnalysis]: Checked inductivity of 1569 backedges. 85 proven. 463 refuted. 0 times theorem prover too weak. 1021 trivial. 0 not checked. [2022-11-19 07:49:03,099 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [59267780] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:49:03,099 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1588889341] [2022-11-19 07:49:03,109 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-11-19 07:49:03,109 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:49:03,109 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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) [2022-11-19 07:49:03,110 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:49:03,110 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 12, 17] total 32 [2022-11-19 07:49:03,110 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1475198799] [2022-11-19 07:49:03,110 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:49:03,111 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2022-11-19 07:49:03,111 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:49:03,112 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2022-11-19 07:49:03,112 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=879, Unknown=0, NotChecked=0, Total=992 [2022-11-19 07:49:03,112 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) [2022-11-19 07:49:04,764 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:49:04,764 INFO L93 Difference]: Finished difference Result 300 states and 568 transitions. [2022-11-19 07:49:04,765 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2022-11-19 07:49:04,765 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 [2022-11-19 07:49:04,766 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:49:04,768 INFO L225 Difference]: With dead ends: 300 [2022-11-19 07:49:04,768 INFO L226 Difference]: Without dead ends: 182 [2022-11-19 07:49:04,771 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 530 GetRequests, 460 SyntacticMatches, 7 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1050 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=590, Invalid=3570, Unknown=0, NotChecked=0, Total=4160 [2022-11-19 07:49:04,771 INFO L413 NwaCegarLoop]: 44 mSDtfsCounter, 187 mSDsluCounter, 420 mSDsCounter, 0 mSdLazyCounter, 1570 mSolverCounterSat, 316 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 188 SdHoareTripleChecker+Valid, 464 SdHoareTripleChecker+Invalid, 1886 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 316 IncrementalHoareTripleChecker+Valid, 1570 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-11-19 07:49:04,772 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [188 Valid, 464 Invalid, 1886 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [316 Valid, 1570 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-11-19 07:49:04,772 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 182 states. [2022-11-19 07:49:04,784 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 182 to 148. [2022-11-19 07:49:04,785 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) [2022-11-19 07:49:04,786 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 148 states to 148 states and 207 transitions. [2022-11-19 07:49:04,786 INFO L78 Accepts]: Start accepts. Automaton has 148 states and 207 transitions. Word has length 239 [2022-11-19 07:49:04,787 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:49:04,787 INFO L495 AbstractCegarLoop]: Abstraction has 148 states and 207 transitions. [2022-11-19 07:49:04,787 INFO L496 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) [2022-11-19 07:49:04,788 INFO L276 IsEmpty]: Start isEmpty. Operand 148 states and 207 transitions. [2022-11-19 07:49:04,809 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 811 [2022-11-19 07:49:04,809 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:49:04,810 INFO L195 NwaCegarLoop]: 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] [2022-11-19 07:49:04,820 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6be86799-7197-40e2-91c6-b142cac049a9/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-11-19 07:49:05,015 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6be86799-7197-40e2-91c6-b142cac049a9/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:49:05,015 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:49:05,016 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:49:05,016 INFO L85 PathProgramCache]: Analyzing trace with hash 480742356, now seen corresponding path program 5 times [2022-11-19 07:49:05,016 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:49:05,016 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [263159315] [2022-11-19 07:49:05,016 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:49:05,016 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:49:05,215 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:49:06,541 INFO L134 CoverageAnalysis]: Checked inductivity of 19676 backedges. 279 proven. 1809 refuted. 0 times theorem prover too weak. 17588 trivial. 0 not checked. [2022-11-19 07:49:06,542 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:49:06,542 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [263159315] [2022-11-19 07:49:06,542 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [263159315] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:49:06,542 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [128462556] [2022-11-19 07:49:06,543 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 07:49:06,543 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:49:06,543 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6be86799-7197-40e2-91c6-b142cac049a9/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:49:06,544 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6be86799-7197-40e2-91c6-b142cac049a9/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:49:06,570 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6be86799-7197-40e2-91c6-b142cac049a9/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-11-19 07:49:06,753 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-11-19 07:49:06,753 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:49:06,755 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 6 conjunts are in the unsatisfiable core [2022-11-19 07:49:06,772 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:49:06,864 INFO L134 CoverageAnalysis]: Checked inductivity of 19676 backedges. 1238 proven. 4 refuted. 0 times theorem prover too weak. 18434 trivial. 0 not checked. [2022-11-19 07:49:06,864 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:49:08,861 INFO L134 CoverageAnalysis]: Checked inductivity of 19676 backedges. 1238 proven. 4 refuted. 0 times theorem prover too weak. 18434 trivial. 0 not checked. [2022-11-19 07:49:08,861 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [128462556] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:49:08,861 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [119857738] [2022-11-19 07:49:08,865 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-11-19 07:49:08,866 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:49:08,866 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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) [2022-11-19 07:49:08,867 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:49:08,868 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 7, 7] total 18 [2022-11-19 07:49:08,868 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1144486201] [2022-11-19 07:49:08,868 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:49:08,869 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-11-19 07:49:08,870 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:49:08,870 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-11-19 07:49:08,870 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2022-11-19 07:49:08,871 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) [2022-11-19 07:49:09,305 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:49:09,306 INFO L93 Difference]: Finished difference Result 351 states and 610 transitions. [2022-11-19 07:49:09,306 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2022-11-19 07:49:09,306 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 [2022-11-19 07:49:09,307 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:49:09,310 INFO L225 Difference]: With dead ends: 351 [2022-11-19 07:49:09,310 INFO L226 Difference]: Without dead ends: 202 [2022-11-19 07:49:09,312 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1647 GetRequests, 1616 SyntacticMatches, 3 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 128 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=167, Invalid=703, Unknown=0, NotChecked=0, Total=870 [2022-11-19 07:49:09,314 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 98 mSDsluCounter, 105 mSDsCounter, 0 mSdLazyCounter, 367 mSolverCounterSat, 90 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 106 SdHoareTripleChecker+Valid, 122 SdHoareTripleChecker+Invalid, 457 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 90 IncrementalHoareTripleChecker+Valid, 367 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-19 07:49:09,314 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [106 Valid, 122 Invalid, 457 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [90 Valid, 367 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-19 07:49:09,316 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 202 states. [2022-11-19 07:49:09,337 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 202 to 182. [2022-11-19 07:49:09,338 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) [2022-11-19 07:49:09,340 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 182 states to 182 states and 294 transitions. [2022-11-19 07:49:09,340 INFO L78 Accepts]: Start accepts. Automaton has 182 states and 294 transitions. Word has length 810 [2022-11-19 07:49:09,341 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:49:09,341 INFO L495 AbstractCegarLoop]: Abstraction has 182 states and 294 transitions. [2022-11-19 07:49:09,341 INFO L496 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) [2022-11-19 07:49:09,341 INFO L276 IsEmpty]: Start isEmpty. Operand 182 states and 294 transitions. [2022-11-19 07:49:09,352 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 484 [2022-11-19 07:49:09,352 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:49:09,352 INFO L195 NwaCegarLoop]: 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] [2022-11-19 07:49:09,362 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6be86799-7197-40e2-91c6-b142cac049a9/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-11-19 07:49:09,558 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6be86799-7197-40e2-91c6-b142cac049a9/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:49:09,558 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:49:09,559 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:49:09,559 INFO L85 PathProgramCache]: Analyzing trace with hash -1209979920, now seen corresponding path program 6 times [2022-11-19 07:49:09,559 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:49:09,559 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1741092626] [2022-11-19 07:49:09,559 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:49:09,560 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:49:09,630 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:49:10,331 INFO L134 CoverageAnalysis]: Checked inductivity of 6759 backedges. 198 proven. 1185 refuted. 0 times theorem prover too weak. 5376 trivial. 0 not checked. [2022-11-19 07:49:10,331 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:49:10,331 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1741092626] [2022-11-19 07:49:10,331 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1741092626] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:49:10,331 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [360027297] [2022-11-19 07:49:10,332 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 07:49:10,332 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:49:10,332 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6be86799-7197-40e2-91c6-b142cac049a9/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:49:10,333 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6be86799-7197-40e2-91c6-b142cac049a9/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:49:10,335 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6be86799-7197-40e2-91c6-b142cac049a9/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-11-19 07:49:10,566 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 07:49:10,566 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:49:10,569 INFO L263 TraceCheckSpWp]: Trace formula consists of 858 conjuncts, 22 conjunts are in the unsatisfiable core [2022-11-19 07:49:10,576 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:49:10,785 INFO L134 CoverageAnalysis]: Checked inductivity of 6759 backedges. 3599 proven. 360 refuted. 0 times theorem prover too weak. 2800 trivial. 0 not checked. [2022-11-19 07:49:10,786 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:49:14,549 INFO L134 CoverageAnalysis]: Checked inductivity of 6759 backedges. 414 proven. 1566 refuted. 0 times theorem prover too weak. 4779 trivial. 0 not checked. [2022-11-19 07:49:14,550 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [360027297] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:49:14,550 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [789300051] [2022-11-19 07:49:14,552 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-11-19 07:49:14,552 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:49:14,552 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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) [2022-11-19 07:49:14,553 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:49:14,553 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 17, 23] total 31 [2022-11-19 07:49:14,554 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [467986056] [2022-11-19 07:49:14,554 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:49:14,555 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2022-11-19 07:49:14,555 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:49:14,555 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2022-11-19 07:49:14,556 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=827, Unknown=0, NotChecked=0, Total=930 [2022-11-19 07:49:14,556 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) [2022-11-19 07:49:15,933 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:49:15,933 INFO L93 Difference]: Finished difference Result 432 states and 860 transitions. [2022-11-19 07:49:15,934 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2022-11-19 07:49:15,934 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 [2022-11-19 07:49:15,935 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:49:15,938 INFO L225 Difference]: With dead ends: 432 [2022-11-19 07:49:15,938 INFO L226 Difference]: Without dead ends: 246 [2022-11-19 07:49:15,941 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1015 GetRequests, 943 SyntacticMatches, 11 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 833 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=607, Invalid=3299, Unknown=0, NotChecked=0, Total=3906 [2022-11-19 07:49:15,942 INFO L413 NwaCegarLoop]: 29 mSDtfsCounter, 257 mSDsluCounter, 240 mSDsCounter, 0 mSdLazyCounter, 1028 mSolverCounterSat, 315 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 258 SdHoareTripleChecker+Valid, 269 SdHoareTripleChecker+Invalid, 1343 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 315 IncrementalHoareTripleChecker+Valid, 1028 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-11-19 07:49:15,943 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [258 Valid, 269 Invalid, 1343 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [315 Valid, 1028 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-11-19 07:49:15,944 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 246 states. [2022-11-19 07:49:15,961 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 246 to 185. [2022-11-19 07:49:15,962 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) [2022-11-19 07:49:15,964 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 185 states to 185 states and 264 transitions. [2022-11-19 07:49:15,965 INFO L78 Accepts]: Start accepts. Automaton has 185 states and 264 transitions. Word has length 483 [2022-11-19 07:49:15,966 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:49:15,966 INFO L495 AbstractCegarLoop]: Abstraction has 185 states and 264 transitions. [2022-11-19 07:49:15,966 INFO L496 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) [2022-11-19 07:49:15,967 INFO L276 IsEmpty]: Start isEmpty. Operand 185 states and 264 transitions. [2022-11-19 07:49:15,972 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 729 [2022-11-19 07:49:15,972 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:49:15,972 INFO L195 NwaCegarLoop]: 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] [2022-11-19 07:49:15,985 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6be86799-7197-40e2-91c6-b142cac049a9/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-11-19 07:49:16,184 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6be86799-7197-40e2-91c6-b142cac049a9/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2022-11-19 07:49:16,184 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:49:16,185 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:49:16,185 INFO L85 PathProgramCache]: Analyzing trace with hash 1983526510, now seen corresponding path program 7 times [2022-11-19 07:49:16,185 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:49:16,185 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1589519060] [2022-11-19 07:49:16,185 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:49:16,185 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:49:16,325 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:49:17,331 INFO L134 CoverageAnalysis]: Checked inductivity of 15629 backedges. 383 proven. 1501 refuted. 0 times theorem prover too weak. 13745 trivial. 0 not checked. [2022-11-19 07:49:17,331 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:49:17,332 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1589519060] [2022-11-19 07:49:17,332 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1589519060] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:49:17,332 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1500362416] [2022-11-19 07:49:17,332 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 07:49:17,332 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:49:17,333 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6be86799-7197-40e2-91c6-b142cac049a9/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:49:17,334 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6be86799-7197-40e2-91c6-b142cac049a9/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:49:17,358 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6be86799-7197-40e2-91c6-b142cac049a9/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-11-19 07:49:17,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:49:17,757 INFO L263 TraceCheckSpWp]: Trace formula consists of 1643 conjuncts, 20 conjunts are in the unsatisfiable core [2022-11-19 07:49:17,767 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:49:17,981 INFO L134 CoverageAnalysis]: Checked inductivity of 15629 backedges. 320 proven. 2126 refuted. 0 times theorem prover too weak. 13183 trivial. 0 not checked. [2022-11-19 07:49:17,981 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:49:22,271 INFO L134 CoverageAnalysis]: Checked inductivity of 15629 backedges. 320 proven. 2170 refuted. 0 times theorem prover too weak. 13139 trivial. 0 not checked. [2022-11-19 07:49:22,272 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1500362416] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:49:22,272 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2135853398] [2022-11-19 07:49:22,273 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-11-19 07:49:22,274 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:49:22,274 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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) [2022-11-19 07:49:22,275 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:49:22,275 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 14, 21] total 30 [2022-11-19 07:49:22,276 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [622002818] [2022-11-19 07:49:22,276 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:49:22,277 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2022-11-19 07:49:22,277 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:49:22,278 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2022-11-19 07:49:22,278 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=157, Invalid=713, Unknown=0, NotChecked=0, Total=870 [2022-11-19 07:49:22,279 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) [2022-11-19 07:49:22,920 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:49:22,920 INFO L93 Difference]: Finished difference Result 293 states and 583 transitions. [2022-11-19 07:49:22,920 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-11-19 07:49:22,921 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 [2022-11-19 07:49:22,922 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:49:22,926 INFO L225 Difference]: With dead ends: 293 [2022-11-19 07:49:22,930 INFO L226 Difference]: Without dead ends: 261 [2022-11-19 07:49:22,933 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1486 GetRequests, 1434 SyntacticMatches, 9 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 672 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=388, Invalid=1592, Unknown=0, NotChecked=0, Total=1980 [2022-11-19 07:49:22,935 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 162 mSDsluCounter, 136 mSDsCounter, 0 mSdLazyCounter, 478 mSolverCounterSat, 225 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 173 SdHoareTripleChecker+Valid, 152 SdHoareTripleChecker+Invalid, 703 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 225 IncrementalHoareTripleChecker+Valid, 478 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-19 07:49:22,935 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [173 Valid, 152 Invalid, 703 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [225 Valid, 478 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-19 07:49:22,936 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 261 states. [2022-11-19 07:49:22,960 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 261 to 246. [2022-11-19 07:49:22,961 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) [2022-11-19 07:49:22,963 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 246 states to 246 states and 427 transitions. [2022-11-19 07:49:22,964 INFO L78 Accepts]: Start accepts. Automaton has 246 states and 427 transitions. Word has length 728 [2022-11-19 07:49:22,965 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:49:22,965 INFO L495 AbstractCegarLoop]: Abstraction has 246 states and 427 transitions. [2022-11-19 07:49:22,965 INFO L496 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) [2022-11-19 07:49:22,966 INFO L276 IsEmpty]: Start isEmpty. Operand 246 states and 427 transitions. [2022-11-19 07:49:23,013 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1722 [2022-11-19 07:49:23,014 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:49:23,014 INFO L195 NwaCegarLoop]: trace histogram [129, 129, 124, 124, 100, 100, 64, 64, 64, 64, 64, 64, 64, 62, 62, 62, 62, 62, 62, 62, 38, 36, 29, 24, 1, 1, 1, 1, 1, 1] [2022-11-19 07:49:23,027 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6be86799-7197-40e2-91c6-b142cac049a9/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2022-11-19 07:49:23,221 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6be86799-7197-40e2-91c6-b142cac049a9/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:49:23,222 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:49:23,222 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:49:23,223 INFO L85 PathProgramCache]: Analyzing trace with hash -1487169191, now seen corresponding path program 8 times [2022-11-19 07:49:23,223 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:49:23,223 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [126688279] [2022-11-19 07:49:23,223 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:49:23,223 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:49:23,764 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:49:27,677 INFO L134 CoverageAnalysis]: Checked inductivity of 89056 backedges. 1271 proven. 4753 refuted. 0 times theorem prover too weak. 83032 trivial. 0 not checked. [2022-11-19 07:49:27,677 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:49:27,678 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [126688279] [2022-11-19 07:49:27,678 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [126688279] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:49:27,678 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1083573873] [2022-11-19 07:49:27,678 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 07:49:27,678 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:49:27,679 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6be86799-7197-40e2-91c6-b142cac049a9/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:49:27,680 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6be86799-7197-40e2-91c6-b142cac049a9/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:49:27,688 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6be86799-7197-40e2-91c6-b142cac049a9/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-11-19 07:49:28,114 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2022-11-19 07:49:28,114 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:49:28,117 INFO L263 TraceCheckSpWp]: Trace formula consists of 315 conjuncts, 8 conjunts are in the unsatisfiable core [2022-11-19 07:49:28,137 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:49:28,275 INFO L134 CoverageAnalysis]: Checked inductivity of 89056 backedges. 8836 proven. 6 refuted. 0 times theorem prover too weak. 80214 trivial. 0 not checked. [2022-11-19 07:49:28,276 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:49:32,935 INFO L134 CoverageAnalysis]: Checked inductivity of 89056 backedges. 3689 proven. 78 refuted. 0 times theorem prover too weak. 85289 trivial. 0 not checked. [2022-11-19 07:49:32,936 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1083573873] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:49:32,936 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [70371772] [2022-11-19 07:49:32,938 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-11-19 07:49:32,938 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:49:32,938 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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) [2022-11-19 07:49:32,939 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:49:32,940 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 9, 9] total 22 [2022-11-19 07:49:32,940 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2145741518] [2022-11-19 07:49:32,941 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:49:32,943 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-11-19 07:49:32,943 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:49:32,944 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-11-19 07:49:32,945 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=399, Unknown=0, NotChecked=0, Total=462 [2022-11-19 07:49:32,946 INFO L87 Difference]: Start difference. First operand 246 states and 427 transitions. Second operand has 22 states, 21 states have (on average 4.095238095238095) internal successors, (86), 22 states have internal predecessors, (86), 15 states have call successors, (26), 2 states have call predecessors, (26), 13 states have return successors, (37), 14 states have call predecessors, (37), 15 states have call successors, (37) [2022-11-19 07:49:33,879 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:49:33,879 INFO L93 Difference]: Finished difference Result 564 states and 1107 transitions. [2022-11-19 07:49:33,880 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2022-11-19 07:49:33,880 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 21 states have (on average 4.095238095238095) internal successors, (86), 22 states have internal predecessors, (86), 15 states have call successors, (26), 2 states have call predecessors, (26), 13 states have return successors, (37), 14 states have call predecessors, (37), 15 states have call successors, (37) Word has length 1721 [2022-11-19 07:49:33,881 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:49:33,889 INFO L225 Difference]: With dead ends: 564 [2022-11-19 07:49:33,890 INFO L226 Difference]: Without dead ends: 280 [2022-11-19 07:49:33,894 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3485 GetRequests, 3437 SyntacticMatches, 4 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 362 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=353, Invalid=1717, Unknown=0, NotChecked=0, Total=2070 [2022-11-19 07:49:33,894 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 164 mSDsluCounter, 151 mSDsCounter, 0 mSdLazyCounter, 725 mSolverCounterSat, 185 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 165 SdHoareTripleChecker+Valid, 175 SdHoareTripleChecker+Invalid, 910 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 185 IncrementalHoareTripleChecker+Valid, 725 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-19 07:49:33,895 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [165 Valid, 175 Invalid, 910 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [185 Valid, 725 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-19 07:49:33,896 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 280 states. [2022-11-19 07:49:33,916 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 280 to 251. [2022-11-19 07:49:33,917 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 251 states, 174 states have (on average 1.1091954022988506) internal successors, (193), 171 states have internal predecessors, (193), 51 states have call successors, (51), 35 states have call predecessors, (51), 25 states have return successors, (147), 44 states have call predecessors, (147), 51 states have call successors, (147) [2022-11-19 07:49:33,919 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 251 states to 251 states and 391 transitions. [2022-11-19 07:49:33,920 INFO L78 Accepts]: Start accepts. Automaton has 251 states and 391 transitions. Word has length 1721 [2022-11-19 07:49:33,920 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:49:33,921 INFO L495 AbstractCegarLoop]: Abstraction has 251 states and 391 transitions. [2022-11-19 07:49:33,921 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 21 states have (on average 4.095238095238095) internal successors, (86), 22 states have internal predecessors, (86), 15 states have call successors, (26), 2 states have call predecessors, (26), 13 states have return successors, (37), 14 states have call predecessors, (37), 15 states have call successors, (37) [2022-11-19 07:49:33,921 INFO L276 IsEmpty]: Start isEmpty. Operand 251 states and 391 transitions. [2022-11-19 07:49:33,951 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1986 [2022-11-19 07:49:33,952 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:49:33,952 INFO L195 NwaCegarLoop]: trace histogram [147, 147, 144, 144, 121, 115, 73, 73, 73, 73, 73, 73, 73, 72, 72, 72, 72, 72, 72, 72, 49, 42, 29, 26, 1, 1, 1, 1, 1, 1] [2022-11-19 07:49:33,963 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6be86799-7197-40e2-91c6-b142cac049a9/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2022-11-19 07:49:34,158 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6be86799-7197-40e2-91c6-b142cac049a9/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2022-11-19 07:49:34,158 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:49:34,159 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:49:34,159 INFO L85 PathProgramCache]: Analyzing trace with hash -1244104556, now seen corresponding path program 9 times [2022-11-19 07:49:34,159 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:49:34,160 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [466502967] [2022-11-19 07:49:34,160 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:49:34,160 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:49:34,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:49:39,786 INFO L134 CoverageAnalysis]: Checked inductivity of 118659 backedges. 4226 proven. 4960 refuted. 0 times theorem prover too weak. 109473 trivial. 0 not checked. [2022-11-19 07:49:39,786 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:49:39,787 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [466502967] [2022-11-19 07:49:39,787 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [466502967] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:49:39,787 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1732645490] [2022-11-19 07:49:39,787 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 07:49:39,787 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:49:39,788 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6be86799-7197-40e2-91c6-b142cac049a9/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:49:39,788 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6be86799-7197-40e2-91c6-b142cac049a9/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:49:39,814 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6be86799-7197-40e2-91c6-b142cac049a9/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-11-19 07:49:40,518 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 07:49:40,518 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:49:40,530 INFO L263 TraceCheckSpWp]: Trace formula consists of 3532 conjuncts, 26 conjunts are in the unsatisfiable core [2022-11-19 07:49:40,547 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:49:40,812 INFO L134 CoverageAnalysis]: Checked inductivity of 118659 backedges. 38902 proven. 926 refuted. 0 times theorem prover too weak. 78831 trivial. 0 not checked. [2022-11-19 07:49:40,813 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:49:50,279 INFO L134 CoverageAnalysis]: Checked inductivity of 118659 backedges. 1577 proven. 9588 refuted. 0 times theorem prover too weak. 107494 trivial. 0 not checked. [2022-11-19 07:49:50,280 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1732645490] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:49:50,280 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1215835998] [2022-11-19 07:49:50,283 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-11-19 07:49:50,283 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:49:50,284 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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) [2022-11-19 07:49:50,285 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:49:50,286 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 19, 27] total 40 [2022-11-19 07:49:50,287 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [608604704] [2022-11-19 07:49:50,287 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:49:50,292 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2022-11-19 07:49:50,292 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:49:50,292 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2022-11-19 07:49:50,293 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=174, Invalid=1386, Unknown=0, NotChecked=0, Total=1560 [2022-11-19 07:49:50,293 INFO L87 Difference]: Start difference. First operand 251 states and 391 transitions. Second operand has 40 states, 40 states have (on average 3.475) internal successors, (139), 40 states have internal predecessors, (139), 31 states have call successors, (44), 2 states have call predecessors, (44), 19 states have return successors, (60), 23 states have call predecessors, (60), 31 states have call successors, (60) [2022-11-19 07:49:52,637 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:49:52,637 INFO L93 Difference]: Finished difference Result 630 states and 1225 transitions. [2022-11-19 07:49:52,638 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2022-11-19 07:49:52,639 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 3.475) internal successors, (139), 40 states have internal predecessors, (139), 31 states have call successors, (44), 2 states have call predecessors, (44), 19 states have return successors, (60), 23 states have call predecessors, (60), 31 states have call successors, (60) Word has length 1985 [2022-11-19 07:49:52,640 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:49:52,649 INFO L225 Difference]: With dead ends: 630 [2022-11-19 07:49:52,650 INFO L226 Difference]: Without dead ends: 389 [2022-11-19 07:49:52,654 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4037 GetRequests, 3944 SyntacticMatches, 13 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1934 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=915, Invalid=5727, Unknown=0, NotChecked=0, Total=6642 [2022-11-19 07:49:52,655 INFO L413 NwaCegarLoop]: 66 mSDtfsCounter, 219 mSDsluCounter, 608 mSDsCounter, 0 mSdLazyCounter, 2317 mSolverCounterSat, 398 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 219 SdHoareTripleChecker+Valid, 674 SdHoareTripleChecker+Invalid, 2715 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 398 IncrementalHoareTripleChecker+Valid, 2317 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2022-11-19 07:49:52,656 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [219 Valid, 674 Invalid, 2715 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [398 Valid, 2317 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2022-11-19 07:49:52,656 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 389 states. [2022-11-19 07:49:52,691 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 389 to 327. [2022-11-19 07:49:52,692 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 327 states, 230 states have (on average 1.0565217391304347) internal successors, (243), 225 states have internal predecessors, (243), 70 states have call successors, (70), 52 states have call predecessors, (70), 26 states have return successors, (219), 49 states have call predecessors, (219), 70 states have call successors, (219) [2022-11-19 07:49:52,695 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 327 states to 327 states and 532 transitions. [2022-11-19 07:49:52,695 INFO L78 Accepts]: Start accepts. Automaton has 327 states and 532 transitions. Word has length 1985 [2022-11-19 07:49:52,696 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:49:52,696 INFO L495 AbstractCegarLoop]: Abstraction has 327 states and 532 transitions. [2022-11-19 07:49:52,696 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 3.475) internal successors, (139), 40 states have internal predecessors, (139), 31 states have call successors, (44), 2 states have call predecessors, (44), 19 states have return successors, (60), 23 states have call predecessors, (60), 31 states have call successors, (60) [2022-11-19 07:49:52,697 INFO L276 IsEmpty]: Start isEmpty. Operand 327 states and 532 transitions. [2022-11-19 07:49:52,744 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2530 [2022-11-19 07:49:52,745 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:49:52,746 INFO L195 NwaCegarLoop]: trace histogram [189, 189, 182, 182, 152, 148, 94, 94, 94, 94, 94, 94, 94, 91, 91, 91, 91, 91, 91, 91, 61, 54, 37, 34, 1, 1, 1, 1, 1, 1] [2022-11-19 07:49:52,760 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6be86799-7197-40e2-91c6-b142cac049a9/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2022-11-19 07:49:52,955 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6be86799-7197-40e2-91c6-b142cac049a9/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2022-11-19 07:49:52,955 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:49:52,955 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:49:52,956 INFO L85 PathProgramCache]: Analyzing trace with hash -252610372, now seen corresponding path program 10 times [2022-11-19 07:49:52,956 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:49:52,956 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1476478766] [2022-11-19 07:49:52,956 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:49:52,956 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:49:53,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:50:04,123 INFO L134 CoverageAnalysis]: Checked inductivity of 193166 backedges. 6952 proven. 9886 refuted. 0 times theorem prover too weak. 176328 trivial. 0 not checked. [2022-11-19 07:50:04,123 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:50:04,124 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1476478766] [2022-11-19 07:50:04,124 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1476478766] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:50:04,124 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1954692978] [2022-11-19 07:50:04,124 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 07:50:04,124 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:50:04,125 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6be86799-7197-40e2-91c6-b142cac049a9/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:50:04,126 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6be86799-7197-40e2-91c6-b142cac049a9/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:50:04,154 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6be86799-7197-40e2-91c6-b142cac049a9/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-11-19 07:50:05,302 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:50:05,321 INFO L263 TraceCheckSpWp]: Trace formula consists of 5641 conjuncts, 24 conjunts are in the unsatisfiable core [2022-11-19 07:50:05,367 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:50:05,709 INFO L134 CoverageAnalysis]: Checked inductivity of 193166 backedges. 1318 proven. 9832 refuted. 0 times theorem prover too weak. 182016 trivial. 0 not checked. [2022-11-19 07:50:05,710 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:50:16,742 INFO L134 CoverageAnalysis]: Checked inductivity of 193166 backedges. 1318 proven. 9902 refuted. 0 times theorem prover too weak. 181946 trivial. 0 not checked. [2022-11-19 07:50:16,742 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1954692978] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:50:16,743 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1307710048] [2022-11-19 07:50:16,746 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-11-19 07:50:16,746 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:50:16,747 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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) [2022-11-19 07:50:16,747 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:50:16,749 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 16, 25] total 44 [2022-11-19 07:50:16,749 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [384692063] [2022-11-19 07:50:16,749 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:50:16,752 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2022-11-19 07:50:16,753 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:50:16,753 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2022-11-19 07:50:16,754 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=195, Invalid=1697, Unknown=0, NotChecked=0, Total=1892 [2022-11-19 07:50:16,754 INFO L87 Difference]: Start difference. First operand 327 states and 532 transitions. Second operand has 44 states, 42 states have (on average 3.2142857142857144) internal successors, (135), 44 states have internal predecessors, (135), 37 states have call successors, (43), 1 states have call predecessors, (43), 23 states have return successors, (59), 24 states have call predecessors, (59), 37 states have call successors, (59) [2022-11-19 07:50:19,957 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:50:19,957 INFO L93 Difference]: Finished difference Result 822 states and 1623 transitions. [2022-11-19 07:50:19,958 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 74 states. [2022-11-19 07:50:19,958 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 42 states have (on average 3.2142857142857144) internal successors, (135), 44 states have internal predecessors, (135), 37 states have call successors, (43), 1 states have call predecessors, (43), 23 states have return successors, (59), 24 states have call predecessors, (59), 37 states have call successors, (59) Word has length 2529 [2022-11-19 07:50:19,961 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:50:19,970 INFO L225 Difference]: With dead ends: 822 [2022-11-19 07:50:19,970 INFO L226 Difference]: Without dead ends: 482 [2022-11-19 07:50:19,977 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5150 GetRequests, 5040 SyntacticMatches, 11 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2916 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=1258, Invalid=8842, Unknown=0, NotChecked=0, Total=10100 [2022-11-19 07:50:19,978 INFO L413 NwaCegarLoop]: 61 mSDtfsCounter, 372 mSDsluCounter, 599 mSDsCounter, 0 mSdLazyCounter, 3021 mSolverCounterSat, 774 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 373 SdHoareTripleChecker+Valid, 660 SdHoareTripleChecker+Invalid, 3795 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 774 IncrementalHoareTripleChecker+Valid, 3021 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.9s IncrementalHoareTripleChecker+Time [2022-11-19 07:50:19,978 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [373 Valid, 660 Invalid, 3795 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [774 Valid, 3021 Invalid, 0 Unknown, 0 Unchecked, 1.9s Time] [2022-11-19 07:50:19,979 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 482 states. [2022-11-19 07:50:20,015 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 482 to 340. [2022-11-19 07:50:20,017 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 340 states, 237 states have (on average 1.0379746835443038) internal successors, (246), 233 states have internal predecessors, (246), 72 states have call successors, (72), 51 states have call predecessors, (72), 30 states have return successors, (231), 55 states have call predecessors, (231), 72 states have call successors, (231) [2022-11-19 07:50:20,019 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 340 states to 340 states and 549 transitions. [2022-11-19 07:50:20,020 INFO L78 Accepts]: Start accepts. Automaton has 340 states and 549 transitions. Word has length 2529 [2022-11-19 07:50:20,022 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:50:20,022 INFO L495 AbstractCegarLoop]: Abstraction has 340 states and 549 transitions. [2022-11-19 07:50:20,022 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 42 states have (on average 3.2142857142857144) internal successors, (135), 44 states have internal predecessors, (135), 37 states have call successors, (43), 1 states have call predecessors, (43), 23 states have return successors, (59), 24 states have call predecessors, (59), 37 states have call successors, (59) [2022-11-19 07:50:20,023 INFO L276 IsEmpty]: Start isEmpty. Operand 340 states and 549 transitions. [2022-11-19 07:50:20,234 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4573 [2022-11-19 07:50:20,235 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:50:20,235 INFO L195 NwaCegarLoop]: trace histogram [336, 336, 335, 335, 274, 269, 168, 168, 168, 168, 168, 168, 168, 167, 167, 167, 167, 167, 167, 167, 107, 101, 66, 62, 1, 1, 1, 1, 1, 1] [2022-11-19 07:50:20,246 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6be86799-7197-40e2-91c6-b142cac049a9/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2022-11-19 07:50:20,436 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6be86799-7197-40e2-91c6-b142cac049a9/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-11-19 07:50:20,436 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:50:20,438 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:50:20,439 INFO L85 PathProgramCache]: Analyzing trace with hash 1810618390, now seen corresponding path program 11 times [2022-11-19 07:50:20,439 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:50:20,439 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2005793620] [2022-11-19 07:50:20,440 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:50:20,440 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:50:21,841 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:50:39,012 INFO L134 CoverageAnalysis]: Checked inductivity of 633903 backedges. 1791 proven. 16745 refuted. 0 times theorem prover too weak. 615367 trivial. 0 not checked. [2022-11-19 07:50:39,013 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:50:39,013 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2005793620] [2022-11-19 07:50:39,013 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2005793620] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:50:39,013 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1553697782] [2022-11-19 07:50:39,013 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 07:50:39,013 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:50:39,013 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6be86799-7197-40e2-91c6-b142cac049a9/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:50:39,015 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6be86799-7197-40e2-91c6-b142cac049a9/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:50:39,024 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6be86799-7197-40e2-91c6-b142cac049a9/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-11-19 07:50:39,952 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 38 check-sat command(s) [2022-11-19 07:50:39,952 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:50:39,960 INFO L263 TraceCheckSpWp]: Trace formula consists of 1394 conjuncts, 18 conjunts are in the unsatisfiable core [2022-11-19 07:50:39,999 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:50:40,345 INFO L134 CoverageAnalysis]: Checked inductivity of 633903 backedges. 16307 proven. 586 refuted. 0 times theorem prover too weak. 617010 trivial. 0 not checked. [2022-11-19 07:50:40,345 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:50:54,282 INFO L134 CoverageAnalysis]: Checked inductivity of 633903 backedges. 16307 proven. 599 refuted. 0 times theorem prover too weak. 616997 trivial. 0 not checked. [2022-11-19 07:50:54,282 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1553697782] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:50:54,283 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1702805405] [2022-11-19 07:50:54,285 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-11-19 07:50:54,285 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:50:54,286 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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) [2022-11-19 07:50:54,286 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:50:54,290 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 19] total 32 [2022-11-19 07:50:54,290 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1607583268] [2022-11-19 07:50:54,290 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:50:54,293 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2022-11-19 07:50:54,293 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:50:54,293 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2022-11-19 07:50:54,293 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=875, Unknown=0, NotChecked=0, Total=992 [2022-11-19 07:50:54,294 INFO L87 Difference]: Start difference. First operand 340 states and 549 transitions. Second operand has 32 states, 31 states have (on average 3.6129032258064515) internal successors, (112), 32 states have internal predecessors, (112), 21 states have call successors, (35), 1 states have call predecessors, (35), 18 states have return successors, (48), 26 states have call predecessors, (48), 21 states have call successors, (48) [2022-11-19 07:50:55,933 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:50:55,933 INFO L93 Difference]: Finished difference Result 896 states and 1738 transitions. [2022-11-19 07:50:55,934 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2022-11-19 07:50:55,934 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 31 states have (on average 3.6129032258064515) internal successors, (112), 32 states have internal predecessors, (112), 21 states have call successors, (35), 1 states have call predecessors, (35), 18 states have return successors, (48), 26 states have call predecessors, (48), 21 states have call successors, (48) Word has length 4572 [2022-11-19 07:50:55,936 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:50:55,944 INFO L225 Difference]: With dead ends: 896 [2022-11-19 07:50:55,944 INFO L226 Difference]: Without dead ends: 505 [2022-11-19 07:50:55,949 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 9204 GetRequests, 9126 SyntacticMatches, 9 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1189 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=748, Invalid=4222, Unknown=0, NotChecked=0, Total=4970 [2022-11-19 07:50:55,950 INFO L413 NwaCegarLoop]: 29 mSDtfsCounter, 246 mSDsluCounter, 248 mSDsCounter, 0 mSdLazyCounter, 1249 mSolverCounterSat, 300 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 247 SdHoareTripleChecker+Valid, 277 SdHoareTripleChecker+Invalid, 1549 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 300 IncrementalHoareTripleChecker+Valid, 1249 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-11-19 07:50:55,950 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [247 Valid, 277 Invalid, 1549 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [300 Valid, 1249 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-11-19 07:50:55,951 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 505 states. [2022-11-19 07:50:55,996 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 505 to 455. [2022-11-19 07:50:55,998 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 455 states, 317 states have (on average 1.0347003154574133) internal successors, (328), 312 states have internal predecessors, (328), 97 states have call successors, (97), 68 states have call predecessors, (97), 40 states have return successors, (394), 74 states have call predecessors, (394), 97 states have call successors, (394) [2022-11-19 07:50:56,002 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 455 states to 455 states and 819 transitions. [2022-11-19 07:50:56,002 INFO L78 Accepts]: Start accepts. Automaton has 455 states and 819 transitions. Word has length 4572 [2022-11-19 07:50:56,003 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:50:56,004 INFO L495 AbstractCegarLoop]: Abstraction has 455 states and 819 transitions. [2022-11-19 07:50:56,004 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 31 states have (on average 3.6129032258064515) internal successors, (112), 32 states have internal predecessors, (112), 21 states have call successors, (35), 1 states have call predecessors, (35), 18 states have return successors, (48), 26 states have call predecessors, (48), 21 states have call successors, (48) [2022-11-19 07:50:56,004 INFO L276 IsEmpty]: Start isEmpty. Operand 455 states and 819 transitions. [2022-11-19 07:50:56,140 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4436 [2022-11-19 07:50:56,140 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:50:56,141 INFO L195 NwaCegarLoop]: trace histogram [339, 339, 312, 312, 266, 260, 169, 169, 169, 169, 169, 169, 169, 156, 156, 156, 156, 156, 156, 156, 110, 91, 73, 52, 1, 1, 1, 1, 1, 1] [2022-11-19 07:50:56,154 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6be86799-7197-40e2-91c6-b142cac049a9/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2022-11-19 07:50:56,349 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6be86799-7197-40e2-91c6-b142cac049a9/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:50:56,350 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:50:56,350 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:50:56,351 INFO L85 PathProgramCache]: Analyzing trace with hash 701140320, now seen corresponding path program 12 times [2022-11-19 07:50:56,351 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:50:56,351 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [167425487] [2022-11-19 07:50:56,352 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:50:56,352 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:50:57,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:51:13,872 INFO L134 CoverageAnalysis]: Checked inductivity of 597287 backedges. 2106 proven. 15837 refuted. 0 times theorem prover too weak. 579344 trivial. 0 not checked. [2022-11-19 07:51:13,872 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:51:13,872 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [167425487] [2022-11-19 07:51:13,872 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [167425487] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:51:13,872 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1364235592] [2022-11-19 07:51:13,873 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 07:51:13,873 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:51:13,873 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6be86799-7197-40e2-91c6-b142cac049a9/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:51:13,874 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6be86799-7197-40e2-91c6-b142cac049a9/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:51:13,877 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6be86799-7197-40e2-91c6-b142cac049a9/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-11-19 07:51:15,354 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 07:51:15,355 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:51:15,379 INFO L263 TraceCheckSpWp]: Trace formula consists of 7892 conjuncts, 22 conjunts are in the unsatisfiable core [2022-11-19 07:51:15,517 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:51:15,856 INFO L134 CoverageAnalysis]: Checked inductivity of 597287 backedges. 65059 proven. 427 refuted. 0 times theorem prover too weak. 531801 trivial. 0 not checked. [2022-11-19 07:51:15,856 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:51:31,458 INFO L134 CoverageAnalysis]: Checked inductivity of 597287 backedges. 2228 proven. 21724 refuted. 0 times theorem prover too weak. 573335 trivial. 0 not checked. [2022-11-19 07:51:31,458 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1364235592] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:51:31,458 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1737275061] [2022-11-19 07:51:31,461 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-11-19 07:51:31,461 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:51:31,461 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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) [2022-11-19 07:51:31,462 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:51:31,463 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 17, 23] total 34 [2022-11-19 07:51:31,463 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1975814248] [2022-11-19 07:51:31,463 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:51:31,466 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2022-11-19 07:51:31,466 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:51:31,466 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2022-11-19 07:51:31,467 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=121, Invalid=1001, Unknown=0, NotChecked=0, Total=1122 [2022-11-19 07:51:31,467 INFO L87 Difference]: Start difference. First operand 455 states and 819 transitions. Second operand has 34 states, 33 states have (on average 3.8181818181818183) internal successors, (126), 34 states have internal predecessors, (126), 29 states have call successors, (39), 2 states have call predecessors, (39), 18 states have return successors, (52), 18 states have call predecessors, (52), 29 states have call successors, (52) [2022-11-19 07:51:33,309 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:51:33,309 INFO L93 Difference]: Finished difference Result 915 states and 1750 transitions. [2022-11-19 07:51:33,310 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2022-11-19 07:51:33,310 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), 29 states have call successors, (39), 2 states have call predecessors, (39), 18 states have return successors, (52), 18 states have call predecessors, (52), 29 states have call successors, (52) Word has length 4435 [2022-11-19 07:51:33,311 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:51:33,317 INFO L225 Difference]: With dead ends: 915 [2022-11-19 07:51:33,317 INFO L226 Difference]: Without dead ends: 470 [2022-11-19 07:51:33,323 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 8939 GetRequests, 8848 SyntacticMatches, 11 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1661 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=935, Invalid=5707, Unknown=0, NotChecked=0, Total=6642 [2022-11-19 07:51:33,323 INFO L413 NwaCegarLoop]: 40 mSDtfsCounter, 345 mSDsluCounter, 308 mSDsCounter, 0 mSdLazyCounter, 1386 mSolverCounterSat, 520 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 346 SdHoareTripleChecker+Valid, 348 SdHoareTripleChecker+Invalid, 1906 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 520 IncrementalHoareTripleChecker+Valid, 1386 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-11-19 07:51:33,324 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [346 Valid, 348 Invalid, 1906 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [520 Valid, 1386 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-11-19 07:51:33,325 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 470 states. [2022-11-19 07:51:33,363 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 470 to 383. [2022-11-19 07:51:33,364 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 383 states, 271 states have (on average 1.03690036900369) internal successors, (281), 266 states have internal predecessors, (281), 83 states have call successors, (83), 64 states have call predecessors, (83), 28 states have return successors, (213), 52 states have call predecessors, (213), 83 states have call successors, (213) [2022-11-19 07:51:33,367 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 383 states to 383 states and 577 transitions. [2022-11-19 07:51:33,367 INFO L78 Accepts]: Start accepts. Automaton has 383 states and 577 transitions. Word has length 4435 [2022-11-19 07:51:33,368 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:51:33,369 INFO L495 AbstractCegarLoop]: Abstraction has 383 states and 577 transitions. [2022-11-19 07:51:33,369 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 33 states have (on average 3.8181818181818183) internal successors, (126), 34 states have internal predecessors, (126), 29 states have call successors, (39), 2 states have call predecessors, (39), 18 states have return successors, (52), 18 states have call predecessors, (52), 29 states have call successors, (52) [2022-11-19 07:51:33,369 INFO L276 IsEmpty]: Start isEmpty. Operand 383 states and 577 transitions. [2022-11-19 07:51:33,453 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3483 [2022-11-19 07:51:33,453 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:51:33,454 INFO L195 NwaCegarLoop]: trace histogram [257, 257, 254, 254, 207, 206, 128, 128, 128, 128, 128, 128, 128, 127, 127, 127, 127, 127, 127, 127, 79, 79, 51, 47, 1, 1, 1, 1, 1, 1] [2022-11-19 07:51:33,471 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6be86799-7197-40e2-91c6-b142cac049a9/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2022-11-19 07:51:33,666 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6be86799-7197-40e2-91c6-b142cac049a9/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:51:33,667 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:51:33,667 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:51:33,668 INFO L85 PathProgramCache]: Analyzing trace with hash 2035647952, now seen corresponding path program 13 times [2022-11-19 07:51:33,668 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:51:33,668 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2034577389] [2022-11-19 07:51:33,668 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:51:33,668 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:51:34,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:51:45,486 INFO L134 CoverageAnalysis]: Checked inductivity of 367060 backedges. 8258 proven. 5784 refuted. 0 times theorem prover too weak. 353018 trivial. 0 not checked. [2022-11-19 07:51:45,487 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:51:45,487 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2034577389] [2022-11-19 07:51:45,487 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2034577389] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:51:45,487 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [904838844] [2022-11-19 07:51:45,487 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 07:51:45,487 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:51:45,487 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6be86799-7197-40e2-91c6-b142cac049a9/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:51:45,488 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6be86799-7197-40e2-91c6-b142cac049a9/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:51:45,495 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6be86799-7197-40e2-91c6-b142cac049a9/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-11-19 07:51:46,962 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:51:46,992 INFO L263 TraceCheckSpWp]: Trace formula consists of 7757 conjuncts, 28 conjunts are in the unsatisfiable core [2022-11-19 07:51:47,016 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:51:47,377 INFO L134 CoverageAnalysis]: Checked inductivity of 367060 backedges. 2429 proven. 15878 refuted. 0 times theorem prover too weak. 348753 trivial. 0 not checked. [2022-11-19 07:51:47,377 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:52:03,874 INFO L134 CoverageAnalysis]: Checked inductivity of 367060 backedges. 2429 proven. 15980 refuted. 0 times theorem prover too weak. 348651 trivial. 0 not checked. [2022-11-19 07:52:03,874 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [904838844] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:52:03,874 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1109521551] [2022-11-19 07:52:03,876 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-11-19 07:52:03,877 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:52:03,877 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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) [2022-11-19 07:52:03,878 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:52:03,879 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 18, 29] total 40 [2022-11-19 07:52:03,879 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [784513221] [2022-11-19 07:52:03,879 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:52:03,883 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2022-11-19 07:52:03,883 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:52:03,883 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2022-11-19 07:52:03,884 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=276, Invalid=1284, Unknown=0, NotChecked=0, Total=1560 [2022-11-19 07:52:03,884 INFO L87 Difference]: Start difference. First operand 383 states and 577 transitions. Second operand has 40 states, 38 states have (on average 3.3684210526315788) internal successors, (128), 40 states have internal predecessors, (128), 36 states have call successors, (40), 1 states have call predecessors, (40), 22 states have return successors, (59), 22 states have call predecessors, (59), 36 states have call successors, (59) [2022-11-19 07:52:04,673 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:52:04,674 INFO L93 Difference]: Finished difference Result 430 states and 708 transitions. [2022-11-19 07:52:04,674 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-11-19 07:52:04,674 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 38 states have (on average 3.3684210526315788) internal successors, (128), 40 states have internal predecessors, (128), 36 states have call successors, (40), 1 states have call predecessors, (40), 22 states have return successors, (59), 22 states have call predecessors, (59), 36 states have call successors, (59) Word has length 3482 [2022-11-19 07:52:04,678 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:52:04,683 INFO L225 Difference]: With dead ends: 430 [2022-11-19 07:52:04,683 INFO L226 Difference]: Without dead ends: 406 [2022-11-19 07:52:04,685 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 7006 GetRequests, 6934 SyntacticMatches, 13 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1432 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=697, Invalid=2963, Unknown=0, NotChecked=0, Total=3660 [2022-11-19 07:52:04,686 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 414 mSDsluCounter, 185 mSDsCounter, 0 mSdLazyCounter, 605 mSolverCounterSat, 349 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 429 SdHoareTripleChecker+Valid, 201 SdHoareTripleChecker+Invalid, 954 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 349 IncrementalHoareTripleChecker+Valid, 605 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-19 07:52:04,686 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [429 Valid, 201 Invalid, 954 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [349 Valid, 605 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-19 07:52:04,687 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 406 states. [2022-11-19 07:52:04,724 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 406 to 396. [2022-11-19 07:52:04,725 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 396 states, 279 states have (on average 1.03584229390681) internal successors, (289), 274 states have internal predecessors, (289), 85 states have call successors, (85), 64 states have call predecessors, (85), 31 states have return successors, (228), 57 states have call predecessors, (228), 85 states have call successors, (228) [2022-11-19 07:52:04,728 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 396 states to 396 states and 602 transitions. [2022-11-19 07:52:04,729 INFO L78 Accepts]: Start accepts. Automaton has 396 states and 602 transitions. Word has length 3482 [2022-11-19 07:52:04,729 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:52:04,730 INFO L495 AbstractCegarLoop]: Abstraction has 396 states and 602 transitions. [2022-11-19 07:52:04,730 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 38 states have (on average 3.3684210526315788) internal successors, (128), 40 states have internal predecessors, (128), 36 states have call successors, (40), 1 states have call predecessors, (40), 22 states have return successors, (59), 22 states have call predecessors, (59), 36 states have call successors, (59) [2022-11-19 07:52:04,730 INFO L276 IsEmpty]: Start isEmpty. Operand 396 states and 602 transitions. [2022-11-19 07:52:05,768 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13056 [2022-11-19 07:52:05,768 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:52:05,770 INFO L195 NwaCegarLoop]: trace histogram [962, 962, 955, 955, 780, 770, 481, 481, 481, 481, 481, 481, 481, 477, 477, 477, 477, 477, 477, 477, 303, 289, 185, 182, 1, 1, 1, 1, 1, 1] [2022-11-19 07:52:05,783 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6be86799-7197-40e2-91c6-b142cac049a9/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2022-11-19 07:52:05,970 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6be86799-7197-40e2-91c6-b142cac049a9/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2022-11-19 07:52:05,970 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:52:05,972 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:52:05,973 INFO L85 PathProgramCache]: Analyzing trace with hash -2126205435, now seen corresponding path program 14 times [2022-11-19 07:52:05,973 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:52:05,973 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [144446522] [2022-11-19 07:52:05,974 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:52:05,974 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:52:15,021 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:54:42,116 INFO L134 CoverageAnalysis]: Checked inductivity of 5186843 backedges. 14606 proven. 64464 refuted. 0 times theorem prover too weak. 5107773 trivial. 0 not checked. [2022-11-19 07:54:42,116 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:54:42,116 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [144446522] [2022-11-19 07:54:42,117 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [144446522] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:54:42,117 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [636358440] [2022-11-19 07:54:42,117 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 07:54:42,117 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:54:42,117 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6be86799-7197-40e2-91c6-b142cac049a9/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:54:42,118 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6be86799-7197-40e2-91c6-b142cac049a9/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:54:42,120 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6be86799-7197-40e2-91c6-b142cac049a9/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2022-11-19 07:54:44,099 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 60 check-sat command(s) [2022-11-19 07:54:44,099 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:54:44,115 INFO L263 TraceCheckSpWp]: Trace formula consists of 2244 conjuncts, 32 conjunts are in the unsatisfiable core [2022-11-19 07:54:44,190 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:54:44,922 INFO L134 CoverageAnalysis]: Checked inductivity of 5186843 backedges. 8454 proven. 72492 refuted. 0 times theorem prover too weak. 5105897 trivial. 0 not checked. [2022-11-19 07:54:44,923 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:55:38,440 INFO L134 CoverageAnalysis]: Checked inductivity of 5186843 backedges. 8454 proven. 72632 refuted. 0 times theorem prover too weak. 5105757 trivial. 0 not checked. [2022-11-19 07:55:38,440 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [636358440] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:55:38,440 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [738472946] [2022-11-19 07:55:38,444 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-11-19 07:55:38,444 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:55:38,444 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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) [2022-11-19 07:55:38,445 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:55:38,451 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 33] total 52 [2022-11-19 07:55:38,451 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1271866877] [2022-11-19 07:55:38,451 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:55:38,460 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2022-11-19 07:55:38,460 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:55:38,461 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2022-11-19 07:55:38,461 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=325, Invalid=2327, Unknown=0, NotChecked=0, Total=2652 [2022-11-19 07:55:38,462 INFO L87 Difference]: Start difference. First operand 396 states and 602 transitions. Second operand has 52 states, 50 states have (on average 3.24) internal successors, (162), 52 states have internal predecessors, (162), 45 states have call successors, (52), 1 states have call predecessors, (52), 27 states have return successors, (74), 28 states have call predecessors, (74), 45 states have call successors, (74) [2022-11-19 07:55:41,693 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:55:41,693 INFO L93 Difference]: Finished difference Result 941 states and 1741 transitions. [2022-11-19 07:55:41,695 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 91 states. [2022-11-19 07:55:41,695 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 50 states have (on average 3.24) internal successors, (162), 52 states have internal predecessors, (162), 45 states have call successors, (52), 1 states have call predecessors, (52), 27 states have return successors, (74), 28 states have call predecessors, (74), 45 states have call successors, (74) Word has length 13055 [2022-11-19 07:55:41,697 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:55:41,704 INFO L225 Difference]: With dead ends: 941 [2022-11-19 07:55:41,704 INFO L226 Difference]: Without dead ends: 523 [2022-11-19 07:55:41,709 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 26198 GetRequests, 26068 SyntacticMatches, 15 SemanticMatches, 115 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3946 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=2077, Invalid=11495, Unknown=0, NotChecked=0, Total=13572 [2022-11-19 07:55:41,710 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 750 mSDsluCounter, 354 mSDsCounter, 0 mSdLazyCounter, 2003 mSolverCounterSat, 1020 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 751 SdHoareTripleChecker+Valid, 382 SdHoareTripleChecker+Invalid, 3023 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1020 IncrementalHoareTripleChecker+Valid, 2003 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2022-11-19 07:55:41,710 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [751 Valid, 382 Invalid, 3023 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1020 Valid, 2003 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2022-11-19 07:55:41,711 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 523 states. [2022-11-19 07:55:41,757 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 523 to 443. [2022-11-19 07:55:41,758 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 443 states, 315 states have (on average 1.0412698412698413) internal successors, (328), 310 states have internal predecessors, (328), 97 states have call successors, (97), 77 states have call predecessors, (97), 30 states have return successors, (280), 55 states have call predecessors, (280), 97 states have call successors, (280) [2022-11-19 07:55:41,762 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 443 states to 443 states and 705 transitions. [2022-11-19 07:55:41,762 INFO L78 Accepts]: Start accepts. Automaton has 443 states and 705 transitions. Word has length 13055 [2022-11-19 07:55:41,764 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:55:41,765 INFO L495 AbstractCegarLoop]: Abstraction has 443 states and 705 transitions. [2022-11-19 07:55:41,765 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 52 states, 50 states have (on average 3.24) internal successors, (162), 52 states have internal predecessors, (162), 45 states have call successors, (52), 1 states have call predecessors, (52), 27 states have return successors, (74), 28 states have call predecessors, (74), 45 states have call successors, (74) [2022-11-19 07:55:41,765 INFO L276 IsEmpty]: Start isEmpty. Operand 443 states and 705 transitions. [2022-11-19 07:55:49,508 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38141 [2022-11-19 07:55:49,508 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:55:49,514 INFO L195 NwaCegarLoop]: trace histogram [2816, 2816, 2785, 2785, 2272, 2259, 1408, 1408, 1408, 1408, 1408, 1408, 1408, 1392, 1392, 1392, 1392, 1392, 1392, 1392, 880, 851, 544, 526, 1, 1, 1, 1, 1, 1] [2022-11-19 07:55:49,522 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6be86799-7197-40e2-91c6-b142cac049a9/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2022-11-19 07:55:49,714 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6be86799-7197-40e2-91c6-b142cac049a9/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2022-11-19 07:55:49,714 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:55:49,716 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:55:49,720 INFO L85 PathProgramCache]: Analyzing trace with hash 1410667901, now seen corresponding path program 15 times [2022-11-19 07:55:49,720 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:55:49,720 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [545497960] [2022-11-19 07:55:49,721 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:55:49,721 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:57:56,787 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat