./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/recursive-simple/fibo_2calls_15-1.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 9bd2c7ff 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_98024b67-90a2-4b4d-844f-a6458a1fc5d2/bin/utaipan-verify-t7M7D8N6sZ/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98024b67-90a2-4b4d-844f-a6458a1fc5d2/bin/utaipan-verify-t7M7D8N6sZ/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98024b67-90a2-4b4d-844f-a6458a1fc5d2/bin/utaipan-verify-t7M7D8N6sZ/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98024b67-90a2-4b4d-844f-a6458a1fc5d2/bin/utaipan-verify-t7M7D8N6sZ/config/TaipanReach.xml -i ../../sv-benchmarks/c/recursive-simple/fibo_2calls_15-1.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98024b67-90a2-4b4d-844f-a6458a1fc5d2/bin/utaipan-verify-t7M7D8N6sZ/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98024b67-90a2-4b4d-844f-a6458a1fc5d2/bin/utaipan-verify-t7M7D8N6sZ --witnessprinter.witness.filename witness --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 532954920d93df80ec8903cd7069d46bd3e41c8f10c6c2a8e6416a137735480b --- Real Ultimate output --- This is Ultimate 0.2.3-dev-9bd2c7f [2023-11-19 04:55:01,911 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-19 04:55:02,046 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98024b67-90a2-4b4d-844f-a6458a1fc5d2/bin/utaipan-verify-t7M7D8N6sZ/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-19 04:55:02,057 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-19 04:55:02,057 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-19 04:55:02,095 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-19 04:55:02,096 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-19 04:55:02,096 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-19 04:55:02,097 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-19 04:55:02,102 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-19 04:55:02,103 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-19 04:55:02,103 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-19 04:55:02,104 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-19 04:55:02,105 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-19 04:55:02,106 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-19 04:55:02,106 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-19 04:55:02,107 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-19 04:55:02,107 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-19 04:55:02,108 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-19 04:55:02,108 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-19 04:55:02,109 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-19 04:55:02,109 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-19 04:55:02,110 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-19 04:55:02,111 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-19 04:55:02,111 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-19 04:55:02,112 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-19 04:55:02,112 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-19 04:55:02,113 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-19 04:55:02,113 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-19 04:55:02,114 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-19 04:55:02,115 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-19 04:55:02,115 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-19 04:55:02,116 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-19 04:55:02,116 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-19 04:55:02,116 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-19 04:55:02,117 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-19 04:55:02,117 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-19 04:55:02,117 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-19 04:55:02,118 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-19 04:55:02,118 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-19 04:55:02,118 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-19 04:55:02,119 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-19 04:55:02,119 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-19 04:55:02,119 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-19 04:55:02,120 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-19 04:55:02,120 INFO L153 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98024b67-90a2-4b4d-844f-a6458a1fc5d2/bin/utaipan-verify-t7M7D8N6sZ/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98024b67-90a2-4b4d-844f-a6458a1fc5d2/bin/utaipan-verify-t7M7D8N6sZ Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 532954920d93df80ec8903cd7069d46bd3e41c8f10c6c2a8e6416a137735480b [2023-11-19 04:55:02,460 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-19 04:55:02,489 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-19 04:55:02,491 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-19 04:55:02,493 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-19 04:55:02,493 INFO L274 PluginConnector]: CDTParser initialized [2023-11-19 04:55:02,495 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98024b67-90a2-4b4d-844f-a6458a1fc5d2/bin/utaipan-verify-t7M7D8N6sZ/../../sv-benchmarks/c/recursive-simple/fibo_2calls_15-1.c [2023-11-19 04:55:05,476 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-19 04:55:05,741 INFO L384 CDTParser]: Found 1 translation units. [2023-11-19 04:55:05,741 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98024b67-90a2-4b4d-844f-a6458a1fc5d2/sv-benchmarks/c/recursive-simple/fibo_2calls_15-1.c [2023-11-19 04:55:05,749 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98024b67-90a2-4b4d-844f-a6458a1fc5d2/bin/utaipan-verify-t7M7D8N6sZ/data/995a46462/a3609486fc9948d6be91a014978c47d2/FLAG6d42dd34f [2023-11-19 04:55:05,767 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98024b67-90a2-4b4d-844f-a6458a1fc5d2/bin/utaipan-verify-t7M7D8N6sZ/data/995a46462/a3609486fc9948d6be91a014978c47d2 [2023-11-19 04:55:05,772 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-19 04:55:05,774 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-19 04:55:05,777 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-19 04:55:05,777 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-19 04:55:05,783 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-19 04:55:05,784 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 04:55:05" (1/1) ... [2023-11-19 04:55:05,785 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5b87e0cd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:55:05, skipping insertion in model container [2023-11-19 04:55:05,785 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 04:55:05" (1/1) ... [2023-11-19 04:55:05,809 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-19 04:55:06,021 WARN L240 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_98024b67-90a2-4b4d-844f-a6458a1fc5d2/sv-benchmarks/c/recursive-simple/fibo_2calls_15-1.c[950,963] [2023-11-19 04:55:06,028 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-19 04:55:06,040 INFO L202 MainTranslator]: Completed pre-run [2023-11-19 04:55:06,063 WARN L240 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_98024b67-90a2-4b4d-844f-a6458a1fc5d2/sv-benchmarks/c/recursive-simple/fibo_2calls_15-1.c[950,963] [2023-11-19 04:55:06,065 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-19 04:55:06,082 INFO L206 MainTranslator]: Completed translation [2023-11-19 04:55:06,082 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:55:06 WrapperNode [2023-11-19 04:55:06,083 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-19 04:55:06,084 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-19 04:55:06,084 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-19 04:55:06,084 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-19 04:55:06,093 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:55:06" (1/1) ... [2023-11-19 04:55:06,112 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:55:06" (1/1) ... [2023-11-19 04:55:06,128 INFO L138 Inliner]: procedures = 14, calls = 12, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 20 [2023-11-19 04:55:06,129 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-19 04:55:06,129 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-19 04:55:06,130 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-19 04:55:06,130 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-19 04:55:06,145 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:55:06" (1/1) ... [2023-11-19 04:55:06,145 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:55:06" (1/1) ... [2023-11-19 04:55:06,160 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:55:06" (1/1) ... [2023-11-19 04:55:06,160 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:55:06" (1/1) ... [2023-11-19 04:55:06,163 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:55:06" (1/1) ... [2023-11-19 04:55:06,184 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:55:06" (1/1) ... [2023-11-19 04:55:06,185 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:55:06" (1/1) ... [2023-11-19 04:55:06,186 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:55:06" (1/1) ... [2023-11-19 04:55:06,187 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-19 04:55:06,188 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-19 04:55:06,188 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-19 04:55:06,189 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-19 04:55:06,189 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:55:06" (1/1) ... [2023-11-19 04:55:06,202 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-19 04:55:06,224 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98024b67-90a2-4b4d-844f-a6458a1fc5d2/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 04:55:06,239 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98024b67-90a2-4b4d-844f-a6458a1fc5d2/bin/utaipan-verify-t7M7D8N6sZ/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-19 04:55:06,246 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98024b67-90a2-4b4d-844f-a6458a1fc5d2/bin/utaipan-verify-t7M7D8N6sZ/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-19 04:55:06,287 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-19 04:55:06,287 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-19 04:55:06,288 INFO L130 BoogieDeclarations]: Found specification of procedure fibo2 [2023-11-19 04:55:06,288 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo2 [2023-11-19 04:55:06,288 INFO L130 BoogieDeclarations]: Found specification of procedure fibo1 [2023-11-19 04:55:06,288 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo1 [2023-11-19 04:55:06,288 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-19 04:55:06,288 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-19 04:55:06,359 INFO L236 CfgBuilder]: Building ICFG [2023-11-19 04:55:06,361 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-19 04:55:06,502 INFO L277 CfgBuilder]: Performing block encoding [2023-11-19 04:55:06,520 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-19 04:55:06,520 INFO L302 CfgBuilder]: Removed 0 assume(true) statements. [2023-11-19 04:55:06,524 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 04:55:06 BoogieIcfgContainer [2023-11-19 04:55:06,525 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-19 04:55:06,527 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-19 04:55:06,527 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-19 04:55:06,531 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-19 04:55:06,531 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.11 04:55:05" (1/3) ... [2023-11-19 04:55:06,532 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@250fc71a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 04:55:06, skipping insertion in model container [2023-11-19 04:55:06,532 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:55:06" (2/3) ... [2023-11-19 04:55:06,532 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@250fc71a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 04:55:06, skipping insertion in model container [2023-11-19 04:55:06,533 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 04:55:06" (3/3) ... [2023-11-19 04:55:06,534 INFO L112 eAbstractionObserver]: Analyzing ICFG fibo_2calls_15-1.c [2023-11-19 04:55:06,555 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-19 04:55:06,556 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-19 04:55:06,601 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-19 04:55:06,607 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=LoopHeads, 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;@3e700d43, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-19 04:55:06,607 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-19 04:55:06,623 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) [2023-11-19 04:55:06,631 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2023-11-19 04:55:06,631 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:55:06,632 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 04:55:06,633 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 04:55:06,639 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:55:06,639 INFO L85 PathProgramCache]: Analyzing trace with hash 2097990987, now seen corresponding path program 1 times [2023-11-19 04:55:06,648 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:55:06,648 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1335177784] [2023-11-19 04:55:06,649 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:55:06,649 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:55:06,778 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:55:06,997 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 04:55:06,997 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 04:55:06,998 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1335177784] [2023-11-19 04:55:06,998 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1335177784] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 04:55:06,999 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 04:55:06,999 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-11-19 04:55:07,001 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2123192655] [2023-11-19 04:55:07,002 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 04:55:07,007 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-19 04:55:07,007 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 04:55:07,054 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-19 04:55:07,055 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-19 04:55:07,057 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) [2023-11-19 04:55:07,140 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 04:55:07,141 INFO L93 Difference]: Finished difference Result 35 states and 44 transitions. [2023-11-19 04:55:07,142 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-19 04:55:07,144 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 [2023-11-19 04:55:07,145 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 04:55:07,154 INFO L225 Difference]: With dead ends: 35 [2023-11-19 04:55:07,155 INFO L226 Difference]: Without dead ends: 26 [2023-11-19 04:55:07,159 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 [2023-11-19 04:55:07,164 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 1 mSDsluCounter, 80 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 108 SdHoareTripleChecker+Invalid, 19 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-19 04:55:07,165 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 108 Invalid, 19 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 19 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-19 04:55:07,188 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2023-11-19 04:55:07,236 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2023-11-19 04:55:07,237 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) [2023-11-19 04:55:07,239 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 33 transitions. [2023-11-19 04:55:07,241 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 33 transitions. Word has length 9 [2023-11-19 04:55:07,242 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 04:55:07,242 INFO L495 AbstractCegarLoop]: Abstraction has 26 states and 33 transitions. [2023-11-19 04:55:07,243 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) [2023-11-19 04:55:07,244 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 33 transitions. [2023-11-19 04:55:07,245 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2023-11-19 04:55:07,246 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:55:07,246 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 04:55:07,247 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-19 04:55:07,247 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 04:55:07,248 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:55:07,248 INFO L85 PathProgramCache]: Analyzing trace with hash 1328370967, now seen corresponding path program 1 times [2023-11-19 04:55:07,249 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:55:07,249 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [432313799] [2023-11-19 04:55:07,250 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:55:07,250 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:55:07,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:55:07,347 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 04:55:07,348 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 04:55:07,348 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [432313799] [2023-11-19 04:55:07,348 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [432313799] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 04:55:07,349 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 04:55:07,349 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-11-19 04:55:07,349 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1592474650] [2023-11-19 04:55:07,349 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 04:55:07,351 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-19 04:55:07,351 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 04:55:07,352 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-19 04:55:07,353 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-19 04:55:07,353 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) [2023-11-19 04:55:07,380 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 04:55:07,380 INFO L93 Difference]: Finished difference Result 32 states and 40 transitions. [2023-11-19 04:55:07,380 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-19 04:55:07,381 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 [2023-11-19 04:55:07,381 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 04:55:07,382 INFO L225 Difference]: With dead ends: 32 [2023-11-19 04:55:07,383 INFO L226 Difference]: Without dead ends: 28 [2023-11-19 04:55:07,383 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 [2023-11-19 04:55:07,385 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 0 mSDsluCounter, 88 mSDsCounter, 0 mSdLazyCounter, 11 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 119 SdHoareTripleChecker+Invalid, 11 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 11 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-19 04:55:07,386 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 119 Invalid, 11 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 11 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-19 04:55:07,387 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2023-11-19 04:55:07,393 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 26. [2023-11-19 04:55:07,393 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) [2023-11-19 04:55:07,395 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 33 transitions. [2023-11-19 04:55:07,395 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 33 transitions. Word has length 10 [2023-11-19 04:55:07,396 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 04:55:07,396 INFO L495 AbstractCegarLoop]: Abstraction has 26 states and 33 transitions. [2023-11-19 04:55:07,396 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) [2023-11-19 04:55:07,397 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 33 transitions. [2023-11-19 04:55:07,398 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2023-11-19 04:55:07,398 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:55:07,398 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 04:55:07,399 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-11-19 04:55:07,399 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 04:55:07,400 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:55:07,400 INFO L85 PathProgramCache]: Analyzing trace with hash -1296553538, now seen corresponding path program 1 times [2023-11-19 04:55:07,400 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:55:07,401 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [148164728] [2023-11-19 04:55:07,401 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:55:07,401 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:55:07,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:55:07,584 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-19 04:55:07,584 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 04:55:07,585 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [148164728] [2023-11-19 04:55:07,585 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [148164728] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 04:55:07,585 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2003102168] [2023-11-19 04:55:07,586 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:55:07,586 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:55:07,586 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98024b67-90a2-4b4d-844f-a6458a1fc5d2/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 04:55:07,588 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98024b67-90a2-4b4d-844f-a6458a1fc5d2/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 04:55:07,619 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98024b67-90a2-4b4d-844f-a6458a1fc5d2/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-19 04:55:07,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:55:07,670 INFO L262 TraceCheckSpWp]: Trace formula consists of 71 conjuncts, 6 conjunts are in the unsatisfiable core [2023-11-19 04:55:07,677 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 04:55:07,798 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-19 04:55:07,800 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 04:55:08,089 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-19 04:55:08,090 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2003102168] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 04:55:08,091 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [162009076] [2023-11-19 04:55:08,128 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2023-11-19 04:55:08,129 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 04:55:08,134 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 04:55:08,142 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 04:55:08,143 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 04:55:08,253 INFO L197 IcfgInterpreter]: Interpreting procedure fibo1 with input of size 35 for LOIs [2023-11-19 04:55:08,343 INFO L197 IcfgInterpreter]: Interpreting procedure fibo2 with input of size 35 for LOIs [2023-11-19 04:55:08,357 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 04:55:08,648 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [162009076] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 04:55:08,648 INFO L185 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2023-11-19 04:55:08,648 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6, 7, 7] total 17 [2023-11-19 04:55:08,649 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2130127772] [2023-11-19 04:55:08,650 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 04:55:08,650 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-19 04:55:08,650 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 04:55:08,651 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-19 04:55:08,652 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=224, Unknown=0, NotChecked=0, Total=272 [2023-11-19 04:55:08,652 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) [2023-11-19 04:55:08,843 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 04:55:08,844 INFO L93 Difference]: Finished difference Result 68 states and 91 transitions. [2023-11-19 04:55:08,844 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-19 04:55:08,845 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 [2023-11-19 04:55:08,845 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 04:55:08,851 INFO L225 Difference]: With dead ends: 68 [2023-11-19 04:55:08,852 INFO L226 Difference]: Without dead ends: 44 [2023-11-19 04:55:08,854 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 54 SyntacticMatches, 2 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=48, Invalid=224, Unknown=0, NotChecked=0, Total=272 [2023-11-19 04:55:08,861 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 11 mSDsluCounter, 91 mSDsCounter, 0 mSdLazyCounter, 85 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 119 SdHoareTripleChecker+Invalid, 88 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 85 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 04:55:08,863 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [16 Valid, 119 Invalid, 88 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 85 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 04:55:08,864 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2023-11-19 04:55:08,875 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 42. [2023-11-19 04:55:08,876 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) [2023-11-19 04:55:08,877 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 50 transitions. [2023-11-19 04:55:08,878 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 50 transitions. Word has length 22 [2023-11-19 04:55:08,878 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 04:55:08,878 INFO L495 AbstractCegarLoop]: Abstraction has 42 states and 50 transitions. [2023-11-19 04:55:08,879 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) [2023-11-19 04:55:08,879 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 50 transitions. [2023-11-19 04:55:08,881 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2023-11-19 04:55:08,882 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:55:08,882 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] [2023-11-19 04:55:08,909 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98024b67-90a2-4b4d-844f-a6458a1fc5d2/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-19 04:55:09,103 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98024b67-90a2-4b4d-844f-a6458a1fc5d2/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2023-11-19 04:55:09,104 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 04:55:09,104 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:55:09,104 INFO L85 PathProgramCache]: Analyzing trace with hash -28918515, now seen corresponding path program 1 times [2023-11-19 04:55:09,105 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:55:09,105 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1719733716] [2023-11-19 04:55:09,105 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:55:09,105 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:55:09,123 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:55:09,330 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 5 proven. 5 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-19 04:55:09,331 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 04:55:09,331 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1719733716] [2023-11-19 04:55:09,331 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1719733716] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 04:55:09,332 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1457835635] [2023-11-19 04:55:09,332 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:55:09,332 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:55:09,332 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98024b67-90a2-4b4d-844f-a6458a1fc5d2/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 04:55:09,340 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98024b67-90a2-4b4d-844f-a6458a1fc5d2/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 04:55:09,341 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98024b67-90a2-4b4d-844f-a6458a1fc5d2/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-19 04:55:09,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:55:09,396 INFO L262 TraceCheckSpWp]: Trace formula consists of 100 conjuncts, 8 conjunts are in the unsatisfiable core [2023-11-19 04:55:09,399 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 04:55:09,496 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-11-19 04:55:09,496 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 04:55:09,915 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-19 04:55:09,915 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1457835635] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 04:55:09,915 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1906055913] [2023-11-19 04:55:09,919 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2023-11-19 04:55:09,920 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 04:55:09,922 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:96) 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:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) 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:337) 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:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) 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) [2023-11-19 04:55:09,925 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 04:55:09,926 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 8, 9] total 14 [2023-11-19 04:55:09,927 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [30229481] [2023-11-19 04:55:09,927 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 04:55:09,929 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-11-19 04:55:09,930 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 04:55:09,933 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-11-19 04:55:09,933 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2023-11-19 04:55:09,934 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) [2023-11-19 04:55:10,172 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 04:55:10,173 INFO L93 Difference]: Finished difference Result 85 states and 121 transitions. [2023-11-19 04:55:10,173 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2023-11-19 04:55:10,173 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 [2023-11-19 04:55:10,174 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 04:55:10,178 INFO L225 Difference]: With dead ends: 85 [2023-11-19 04:55:10,178 INFO L226 Difference]: Without dead ends: 53 [2023-11-19 04:55:10,180 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 [2023-11-19 04:55:10,184 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 35 mSDsluCounter, 86 mSDsCounter, 0 mSdLazyCounter, 127 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 104 SdHoareTripleChecker+Invalid, 151 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 127 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 04:55:10,188 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [40 Valid, 104 Invalid, 151 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 127 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 04:55:10,190 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2023-11-19 04:55:10,214 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 44. [2023-11-19 04:55:10,215 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) [2023-11-19 04:55:10,218 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 53 transitions. [2023-11-19 04:55:10,218 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 53 transitions. Word has length 35 [2023-11-19 04:55:10,219 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 04:55:10,220 INFO L495 AbstractCegarLoop]: Abstraction has 44 states and 53 transitions. [2023-11-19 04:55:10,220 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) [2023-11-19 04:55:10,220 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 53 transitions. [2023-11-19 04:55:10,224 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2023-11-19 04:55:10,224 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:55:10,225 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] [2023-11-19 04:55:10,251 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98024b67-90a2-4b4d-844f-a6458a1fc5d2/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-19 04:55:10,425 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98024b67-90a2-4b4d-844f-a6458a1fc5d2/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:55:10,425 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 04:55:10,426 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:55:10,426 INFO L85 PathProgramCache]: Analyzing trace with hash -243412115, now seen corresponding path program 1 times [2023-11-19 04:55:10,426 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:55:10,426 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1392898188] [2023-11-19 04:55:10,426 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:55:10,426 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:55:10,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:55:10,581 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-11-19 04:55:10,581 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 04:55:10,582 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1392898188] [2023-11-19 04:55:10,582 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1392898188] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 04:55:10,582 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1291631141] [2023-11-19 04:55:10,583 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:55:10,583 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:55:10,583 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98024b67-90a2-4b4d-844f-a6458a1fc5d2/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 04:55:10,584 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98024b67-90a2-4b4d-844f-a6458a1fc5d2/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 04:55:10,617 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98024b67-90a2-4b4d-844f-a6458a1fc5d2/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-19 04:55:10,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:55:10,654 INFO L262 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 8 conjunts are in the unsatisfiable core [2023-11-19 04:55:10,662 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 04:55:10,758 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-19 04:55:10,758 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 04:55:11,118 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 11 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-19 04:55:11,118 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1291631141] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 04:55:11,119 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1918577858] [2023-11-19 04:55:11,121 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2023-11-19 04:55:11,122 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 04:55:11,122 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:96) 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:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) 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:337) 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:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) 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) [2023-11-19 04:55:11,122 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 04:55:11,122 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 9] total 18 [2023-11-19 04:55:11,123 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [671650870] [2023-11-19 04:55:11,123 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 04:55:11,123 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2023-11-19 04:55:11,124 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 04:55:11,124 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2023-11-19 04:55:11,125 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2023-11-19 04:55:11,125 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) [2023-11-19 04:55:11,578 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 04:55:11,578 INFO L93 Difference]: Finished difference Result 121 states and 203 transitions. [2023-11-19 04:55:11,579 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2023-11-19 04:55:11,579 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 [2023-11-19 04:55:11,580 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 04:55:11,581 INFO L225 Difference]: With dead ends: 121 [2023-11-19 04:55:11,582 INFO L226 Difference]: Without dead ends: 77 [2023-11-19 04:55:11,584 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 68 SyntacticMatches, 3 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 126 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=142, Invalid=670, Unknown=0, NotChecked=0, Total=812 [2023-11-19 04:55:11,584 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 52 mSDsluCounter, 177 mSDsCounter, 0 mSdLazyCounter, 339 mSolverCounterSat, 43 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 56 SdHoareTripleChecker+Valid, 205 SdHoareTripleChecker+Invalid, 382 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 43 IncrementalHoareTripleChecker+Valid, 339 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-19 04:55:11,585 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [56 Valid, 205 Invalid, 382 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [43 Valid, 339 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-19 04:55:11,586 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2023-11-19 04:55:11,600 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 63. [2023-11-19 04:55:11,601 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) [2023-11-19 04:55:11,603 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 91 transitions. [2023-11-19 04:55:11,603 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 91 transitions. Word has length 36 [2023-11-19 04:55:11,603 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 04:55:11,603 INFO L495 AbstractCegarLoop]: Abstraction has 63 states and 91 transitions. [2023-11-19 04:55:11,604 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) [2023-11-19 04:55:11,604 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 91 transitions. [2023-11-19 04:55:11,606 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2023-11-19 04:55:11,607 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:55:11,607 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] [2023-11-19 04:55:11,632 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98024b67-90a2-4b4d-844f-a6458a1fc5d2/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-19 04:55:11,820 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98024b67-90a2-4b4d-844f-a6458a1fc5d2/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:55:11,820 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 04:55:11,820 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:55:11,821 INFO L85 PathProgramCache]: Analyzing trace with hash 403750738, now seen corresponding path program 1 times [2023-11-19 04:55:11,821 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:55:11,821 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1830981967] [2023-11-19 04:55:11,821 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:55:11,821 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:55:11,835 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:55:11,935 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 12 proven. 12 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2023-11-19 04:55:11,935 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 04:55:11,935 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1830981967] [2023-11-19 04:55:11,936 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1830981967] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 04:55:11,936 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2005221408] [2023-11-19 04:55:11,936 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:55:11,936 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:55:11,936 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98024b67-90a2-4b4d-844f-a6458a1fc5d2/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 04:55:11,937 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98024b67-90a2-4b4d-844f-a6458a1fc5d2/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 04:55:11,964 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98024b67-90a2-4b4d-844f-a6458a1fc5d2/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-19 04:55:12,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:55:12,006 INFO L262 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 10 conjunts are in the unsatisfiable core [2023-11-19 04:55:12,009 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 04:55:12,103 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 4 proven. 23 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2023-11-19 04:55:12,103 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 04:55:12,697 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 4 proven. 28 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-11-19 04:55:12,697 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2005221408] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 04:55:12,698 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2062638864] [2023-11-19 04:55:12,703 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2023-11-19 04:55:12,703 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 04:55:12,704 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:96) 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:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) 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:337) 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:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) 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) [2023-11-19 04:55:12,705 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 04:55:12,705 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9, 11] total 17 [2023-11-19 04:55:12,705 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1241042707] [2023-11-19 04:55:12,707 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 04:55:12,708 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2023-11-19 04:55:12,708 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 04:55:12,709 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2023-11-19 04:55:12,709 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2023-11-19 04:55:12,710 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) [2023-11-19 04:55:12,936 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 04:55:12,937 INFO L93 Difference]: Finished difference Result 119 states and 203 transitions. [2023-11-19 04:55:12,937 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-11-19 04:55:12,938 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 [2023-11-19 04:55:12,938 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 04:55:12,942 INFO L225 Difference]: With dead ends: 119 [2023-11-19 04:55:12,942 INFO L226 Difference]: Without dead ends: 97 [2023-11-19 04:55:12,944 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 [2023-11-19 04:55:12,945 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 44 mSDsluCounter, 85 mSDsCounter, 0 mSdLazyCounter, 112 mSolverCounterSat, 37 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 56 SdHoareTripleChecker+Valid, 101 SdHoareTripleChecker+Invalid, 149 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 37 IncrementalHoareTripleChecker+Valid, 112 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 04:55:12,945 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [56 Valid, 101 Invalid, 149 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [37 Valid, 112 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 04:55:12,947 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2023-11-19 04:55:12,970 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 72. [2023-11-19 04:55:12,970 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) [2023-11-19 04:55:12,972 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 105 transitions. [2023-11-19 04:55:12,972 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 105 transitions. Word has length 50 [2023-11-19 04:55:12,972 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 04:55:12,972 INFO L495 AbstractCegarLoop]: Abstraction has 72 states and 105 transitions. [2023-11-19 04:55:12,973 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) [2023-11-19 04:55:12,973 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 105 transitions. [2023-11-19 04:55:12,977 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2023-11-19 04:55:12,977 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:55:12,977 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 6, 6, 6, 5, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 04:55:13,003 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98024b67-90a2-4b4d-844f-a6458a1fc5d2/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-19 04:55:13,198 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98024b67-90a2-4b4d-844f-a6458a1fc5d2/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2023-11-19 04:55:13,198 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 04:55:13,199 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:55:13,199 INFO L85 PathProgramCache]: Analyzing trace with hash -1002637961, now seen corresponding path program 1 times [2023-11-19 04:55:13,199 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:55:13,199 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [993826538] [2023-11-19 04:55:13,199 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:55:13,200 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:55:13,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:55:13,414 INFO L134 CoverageAnalysis]: Checked inductivity of 193 backedges. 40 proven. 59 refuted. 0 times theorem prover too weak. 94 trivial. 0 not checked. [2023-11-19 04:55:13,414 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 04:55:13,415 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [993826538] [2023-11-19 04:55:13,415 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [993826538] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 04:55:13,415 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [561195569] [2023-11-19 04:55:13,415 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:55:13,415 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:55:13,416 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98024b67-90a2-4b4d-844f-a6458a1fc5d2/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 04:55:13,417 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98024b67-90a2-4b4d-844f-a6458a1fc5d2/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 04:55:13,440 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98024b67-90a2-4b4d-844f-a6458a1fc5d2/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-19 04:55:13,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:55:13,509 INFO L262 TraceCheckSpWp]: Trace formula consists of 226 conjuncts, 12 conjunts are in the unsatisfiable core [2023-11-19 04:55:13,519 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 04:55:13,654 INFO L134 CoverageAnalysis]: Checked inductivity of 193 backedges. 13 proven. 92 refuted. 0 times theorem prover too weak. 88 trivial. 0 not checked. [2023-11-19 04:55:13,654 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 04:55:14,680 INFO L134 CoverageAnalysis]: Checked inductivity of 193 backedges. 13 proven. 102 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2023-11-19 04:55:14,680 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [561195569] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 04:55:14,680 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [923469465] [2023-11-19 04:55:14,686 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2023-11-19 04:55:14,686 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 04:55:14,687 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:96) 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:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) 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:337) 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:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) 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) [2023-11-19 04:55:14,688 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 04:55:14,689 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 13] total 23 [2023-11-19 04:55:14,689 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2111941538] [2023-11-19 04:55:14,689 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 04:55:14,692 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2023-11-19 04:55:14,692 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 04:55:14,693 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2023-11-19 04:55:14,693 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=439, Unknown=0, NotChecked=0, Total=506 [2023-11-19 04:55:14,698 INFO L87 Difference]: Start difference. First operand 72 states and 105 transitions. Second operand has 23 states, 21 states have (on average 3.5714285714285716) internal successors, (75), 23 states have internal predecessors, (75), 18 states have call successors, (23), 1 states have call predecessors, (23), 9 states have return successors, (27), 10 states have call predecessors, (27), 18 states have call successors, (27) [2023-11-19 04:55:15,449 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 04:55:15,449 INFO L93 Difference]: Finished difference Result 204 states and 411 transitions. [2023-11-19 04:55:15,450 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2023-11-19 04:55:15,450 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 21 states have (on average 3.5714285714285716) internal successors, (75), 23 states have internal predecessors, (75), 18 states have call successors, (23), 1 states have call predecessors, (23), 9 states have return successors, (27), 10 states have call predecessors, (27), 18 states have call successors, (27) Word has length 92 [2023-11-19 04:55:15,450 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 04:55:15,453 INFO L225 Difference]: With dead ends: 204 [2023-11-19 04:55:15,453 INFO L226 Difference]: Without dead ends: 115 [2023-11-19 04:55:15,455 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 210 GetRequests, 167 SyntacticMatches, 5 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 252 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=263, Invalid=1297, Unknown=0, NotChecked=0, Total=1560 [2023-11-19 04:55:15,456 INFO L413 NwaCegarLoop]: 35 mSDtfsCounter, 89 mSDsluCounter, 297 mSDsCounter, 0 mSdLazyCounter, 545 mSolverCounterSat, 93 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 90 SdHoareTripleChecker+Valid, 332 SdHoareTripleChecker+Invalid, 638 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 93 IncrementalHoareTripleChecker+Valid, 545 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-11-19 04:55:15,456 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [90 Valid, 332 Invalid, 638 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [93 Valid, 545 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-11-19 04:55:15,457 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2023-11-19 04:55:15,489 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 98. [2023-11-19 04:55:15,490 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) [2023-11-19 04:55:15,494 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 144 transitions. [2023-11-19 04:55:15,494 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 144 transitions. Word has length 92 [2023-11-19 04:55:15,496 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 04:55:15,497 INFO L495 AbstractCegarLoop]: Abstraction has 98 states and 144 transitions. [2023-11-19 04:55:15,499 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 21 states have (on average 3.5714285714285716) internal successors, (75), 23 states have internal predecessors, (75), 18 states have call successors, (23), 1 states have call predecessors, (23), 9 states have return successors, (27), 10 states have call predecessors, (27), 18 states have call successors, (27) [2023-11-19 04:55:15,499 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 144 transitions. [2023-11-19 04:55:15,506 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 143 [2023-11-19 04:55:15,506 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:55:15,507 INFO L195 NwaCegarLoop]: trace histogram [12, 12, 9, 9, 7, 6, 6, 6, 6, 6, 6, 6, 6, 6, 4, 4, 4, 4, 4, 4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 04:55:15,528 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98024b67-90a2-4b4d-844f-a6458a1fc5d2/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-19 04:55:15,726 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98024b67-90a2-4b4d-844f-a6458a1fc5d2/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2023-11-19 04:55:15,726 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 04:55:15,726 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:55:15,727 INFO L85 PathProgramCache]: Analyzing trace with hash 1596421381, now seen corresponding path program 2 times [2023-11-19 04:55:15,727 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:55:15,727 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [16950492] [2023-11-19 04:55:15,727 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:55:15,727 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:55:15,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:55:15,916 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 39 proven. 116 refuted. 0 times theorem prover too weak. 373 trivial. 0 not checked. [2023-11-19 04:55:15,916 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 04:55:15,917 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [16950492] [2023-11-19 04:55:15,917 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [16950492] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 04:55:15,917 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [168497160] [2023-11-19 04:55:15,917 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-19 04:55:15,917 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:55:15,918 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98024b67-90a2-4b4d-844f-a6458a1fc5d2/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 04:55:15,919 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98024b67-90a2-4b4d-844f-a6458a1fc5d2/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 04:55:15,940 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98024b67-90a2-4b4d-844f-a6458a1fc5d2/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-19 04:55:15,999 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-11-19 04:55:15,999 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-19 04:55:16,000 INFO L262 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 5 conjunts are in the unsatisfiable core [2023-11-19 04:55:16,012 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 04:55:16,046 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 150 proven. 0 refuted. 0 times theorem prover too weak. 378 trivial. 0 not checked. [2023-11-19 04:55:16,046 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-19 04:55:16,046 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [168497160] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 04:55:16,047 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-19 04:55:16,047 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6] total 6 [2023-11-19 04:55:16,047 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1826796655] [2023-11-19 04:55:16,047 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 04:55:16,048 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-19 04:55:16,048 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 04:55:16,048 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-19 04:55:16,049 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-11-19 04:55:16,049 INFO L87 Difference]: Start difference. First operand 98 states and 144 transitions. Second operand has 6 states, 5 states have (on average 6.4) internal successors, (32), 6 states have internal predecessors, (32), 3 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (9), 2 states have call predecessors, (9), 3 states have call successors, (9) [2023-11-19 04:55:16,102 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 04:55:16,102 INFO L93 Difference]: Finished difference Result 188 states and 309 transitions. [2023-11-19 04:55:16,103 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-19 04:55:16,103 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 6.4) internal successors, (32), 6 states have internal predecessors, (32), 3 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (9), 2 states have call predecessors, (9), 3 states have call successors, (9) Word has length 142 [2023-11-19 04:55:16,103 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 04:55:16,105 INFO L225 Difference]: With dead ends: 188 [2023-11-19 04:55:16,105 INFO L226 Difference]: Without dead ends: 100 [2023-11-19 04:55:16,106 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 142 SyntacticMatches, 2 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2023-11-19 04:55:16,107 INFO L413 NwaCegarLoop]: 26 mSDtfsCounter, 13 mSDsluCounter, 72 mSDsCounter, 0 mSdLazyCounter, 48 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 98 SdHoareTripleChecker+Invalid, 48 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 48 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-19 04:55:16,107 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [18 Valid, 98 Invalid, 48 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 48 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-19 04:55:16,108 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2023-11-19 04:55:16,121 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 100. [2023-11-19 04:55:16,122 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) [2023-11-19 04:55:16,123 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 143 transitions. [2023-11-19 04:55:16,123 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 143 transitions. Word has length 142 [2023-11-19 04:55:16,126 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 04:55:16,126 INFO L495 AbstractCegarLoop]: Abstraction has 100 states and 143 transitions. [2023-11-19 04:55:16,126 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 6.4) internal successors, (32), 6 states have internal predecessors, (32), 3 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (9), 2 states have call predecessors, (9), 3 states have call successors, (9) [2023-11-19 04:55:16,126 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 143 transitions. [2023-11-19 04:55:16,132 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 159 [2023-11-19 04:55:16,132 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:55:16,132 INFO L195 NwaCegarLoop]: trace histogram [14, 14, 10, 9, 9, 7, 7, 7, 7, 7, 7, 7, 7, 6, 4, 4, 4, 4, 4, 4, 4, 4, 2, 1, 1, 1, 1, 1, 1] [2023-11-19 04:55:16,158 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98024b67-90a2-4b4d-844f-a6458a1fc5d2/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-11-19 04:55:16,346 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98024b67-90a2-4b4d-844f-a6458a1fc5d2/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2023-11-19 04:55:16,346 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 04:55:16,346 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:55:16,346 INFO L85 PathProgramCache]: Analyzing trace with hash 925382980, now seen corresponding path program 2 times [2023-11-19 04:55:16,346 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:55:16,347 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2103377138] [2023-11-19 04:55:16,347 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:55:16,347 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:55:16,377 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:55:16,656 INFO L134 CoverageAnalysis]: Checked inductivity of 682 backedges. 43 proven. 179 refuted. 0 times theorem prover too weak. 460 trivial. 0 not checked. [2023-11-19 04:55:16,656 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 04:55:16,656 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2103377138] [2023-11-19 04:55:16,657 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2103377138] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 04:55:16,657 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [563592191] [2023-11-19 04:55:16,657 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-19 04:55:16,657 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:55:16,657 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98024b67-90a2-4b4d-844f-a6458a1fc5d2/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 04:55:16,658 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98024b67-90a2-4b4d-844f-a6458a1fc5d2/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 04:55:16,680 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98024b67-90a2-4b4d-844f-a6458a1fc5d2/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-11-19 04:55:16,749 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2023-11-19 04:55:16,749 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-19 04:55:16,750 INFO L262 TraceCheckSpWp]: Trace formula consists of 192 conjuncts, 8 conjunts are in the unsatisfiable core [2023-11-19 04:55:16,757 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 04:55:16,844 INFO L134 CoverageAnalysis]: Checked inductivity of 682 backedges. 361 proven. 6 refuted. 0 times theorem prover too weak. 315 trivial. 0 not checked. [2023-11-19 04:55:16,844 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 04:55:17,491 INFO L134 CoverageAnalysis]: Checked inductivity of 682 backedges. 180 proven. 39 refuted. 0 times theorem prover too weak. 463 trivial. 0 not checked. [2023-11-19 04:55:17,491 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [563592191] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 04:55:17,491 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [948790913] [2023-11-19 04:55:17,494 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2023-11-19 04:55:17,494 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 04:55:17,494 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:96) 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:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) 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:337) 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:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) 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) [2023-11-19 04:55:17,495 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 04:55:17,495 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 9] total 18 [2023-11-19 04:55:17,495 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2063679890] [2023-11-19 04:55:17,495 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 04:55:17,496 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2023-11-19 04:55:17,496 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 04:55:17,497 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2023-11-19 04:55:17,497 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=263, Unknown=0, NotChecked=0, Total=306 [2023-11-19 04:55:17,498 INFO L87 Difference]: Start difference. First operand 100 states and 143 transitions. Second operand has 18 states, 17 states have (on average 4.176470588235294) internal successors, (71), 18 states have internal predecessors, (71), 12 states have call successors, (21), 2 states have call predecessors, (21), 9 states have return successors, (27), 9 states have call predecessors, (27), 12 states have call successors, (27) [2023-11-19 04:55:18,024 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 04:55:18,025 INFO L93 Difference]: Finished difference Result 222 states and 343 transitions. [2023-11-19 04:55:18,025 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2023-11-19 04:55:18,026 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 17 states have (on average 4.176470588235294) internal successors, (71), 18 states have internal predecessors, (71), 12 states have call successors, (21), 2 states have call predecessors, (21), 9 states have return successors, (27), 9 states have call predecessors, (27), 12 states have call successors, (27) Word has length 158 [2023-11-19 04:55:18,026 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 04:55:18,028 INFO L225 Difference]: With dead ends: 222 [2023-11-19 04:55:18,028 INFO L226 Difference]: Without dead ends: 132 [2023-11-19 04:55:18,030 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 342 GetRequests, 308 SyntacticMatches, 4 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 120 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=173, Invalid=819, Unknown=0, NotChecked=0, Total=992 [2023-11-19 04:55:18,030 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 74 mSDsluCounter, 212 mSDsCounter, 0 mSdLazyCounter, 435 mSolverCounterSat, 60 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 75 SdHoareTripleChecker+Valid, 236 SdHoareTripleChecker+Invalid, 495 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 60 IncrementalHoareTripleChecker+Valid, 435 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-19 04:55:18,031 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [75 Valid, 236 Invalid, 495 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [60 Valid, 435 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-19 04:55:18,032 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2023-11-19 04:55:18,047 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 95. [2023-11-19 04:55:18,048 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95 states, 62 states have (on average 1.1774193548387097) internal successors, (73), 64 states have internal predecessors, (73), 19 states have call successors, (19), 8 states have call predecessors, (19), 13 states have return successors, (43), 22 states have call predecessors, (43), 19 states have call successors, (43) [2023-11-19 04:55:18,049 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 135 transitions. [2023-11-19 04:55:18,050 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 135 transitions. Word has length 158 [2023-11-19 04:55:18,050 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 04:55:18,050 INFO L495 AbstractCegarLoop]: Abstraction has 95 states and 135 transitions. [2023-11-19 04:55:18,051 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 17 states have (on average 4.176470588235294) internal successors, (71), 18 states have internal predecessors, (71), 12 states have call successors, (21), 2 states have call predecessors, (21), 9 states have return successors, (27), 9 states have call predecessors, (27), 12 states have call successors, (27) [2023-11-19 04:55:18,051 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 135 transitions. [2023-11-19 04:55:18,054 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 161 [2023-11-19 04:55:18,054 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:55:18,054 INFO L195 NwaCegarLoop]: trace histogram [12, 12, 11, 11, 10, 9, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 3, 2, 2, 1, 1, 1, 1, 1, 1] [2023-11-19 04:55:18,085 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98024b67-90a2-4b4d-844f-a6458a1fc5d2/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-11-19 04:55:18,276 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98024b67-90a2-4b4d-844f-a6458a1fc5d2/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:55:18,277 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 04:55:18,277 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:55:18,277 INFO L85 PathProgramCache]: Analyzing trace with hash 1318136814, now seen corresponding path program 3 times [2023-11-19 04:55:18,277 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:55:18,278 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [888444466] [2023-11-19 04:55:18,278 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:55:18,278 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:55:18,318 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:55:18,577 INFO L134 CoverageAnalysis]: Checked inductivity of 665 backedges. 71 proven. 162 refuted. 0 times theorem prover too weak. 432 trivial. 0 not checked. [2023-11-19 04:55:18,577 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 04:55:18,577 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [888444466] [2023-11-19 04:55:18,577 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [888444466] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 04:55:18,578 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1132144946] [2023-11-19 04:55:18,578 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-19 04:55:18,578 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:55:18,578 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98024b67-90a2-4b4d-844f-a6458a1fc5d2/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 04:55:18,579 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98024b67-90a2-4b4d-844f-a6458a1fc5d2/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 04:55:18,598 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98024b67-90a2-4b4d-844f-a6458a1fc5d2/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-11-19 04:55:18,684 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-19 04:55:18,685 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-19 04:55:18,686 INFO L262 TraceCheckSpWp]: Trace formula consists of 284 conjuncts, 10 conjunts are in the unsatisfiable core [2023-11-19 04:55:18,690 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 04:55:18,764 INFO L134 CoverageAnalysis]: Checked inductivity of 665 backedges. 338 proven. 19 refuted. 0 times theorem prover too weak. 308 trivial. 0 not checked. [2023-11-19 04:55:18,764 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 04:55:19,598 INFO L134 CoverageAnalysis]: Checked inductivity of 665 backedges. 69 proven. 196 refuted. 0 times theorem prover too weak. 400 trivial. 0 not checked. [2023-11-19 04:55:19,598 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1132144946] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 04:55:19,599 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [862494076] [2023-11-19 04:55:19,601 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2023-11-19 04:55:19,601 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 04:55:19,602 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:96) 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:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) 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:337) 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:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) 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) [2023-11-19 04:55:19,603 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 04:55:19,603 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 11] total 17 [2023-11-19 04:55:19,604 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1235211411] [2023-11-19 04:55:19,604 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 04:55:19,605 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2023-11-19 04:55:19,605 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 04:55:19,606 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2023-11-19 04:55:19,606 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=222, Unknown=0, NotChecked=0, Total=272 [2023-11-19 04:55:19,606 INFO L87 Difference]: Start difference. First operand 95 states and 135 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) [2023-11-19 04:55:19,896 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 04:55:19,897 INFO L93 Difference]: Finished difference Result 189 states and 285 transitions. [2023-11-19 04:55:19,898 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-11-19 04:55:19,898 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 160 [2023-11-19 04:55:19,899 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 04:55:19,900 INFO L225 Difference]: With dead ends: 189 [2023-11-19 04:55:19,901 INFO L226 Difference]: Without dead ends: 102 [2023-11-19 04:55:19,902 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 336 GetRequests, 309 SyntacticMatches, 5 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 111 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=115, Invalid=437, Unknown=0, NotChecked=0, Total=552 [2023-11-19 04:55:19,902 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 30 mSDsluCounter, 190 mSDsCounter, 0 mSdLazyCounter, 264 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 215 SdHoareTripleChecker+Invalid, 283 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 264 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-19 04:55:19,903 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [31 Valid, 215 Invalid, 283 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 264 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-19 04:55:19,903 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2023-11-19 04:55:19,914 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 102. [2023-11-19 04:55:19,914 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 102 states, 67 states have (on average 1.1343283582089552) internal successors, (76), 69 states have internal predecessors, (76), 19 states have call successors, (19), 9 states have call predecessors, (19), 15 states have return successors, (44), 23 states have call predecessors, (44), 19 states have call successors, (44) [2023-11-19 04:55:19,916 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 139 transitions. [2023-11-19 04:55:19,916 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 139 transitions. Word has length 160 [2023-11-19 04:55:19,916 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 04:55:19,916 INFO L495 AbstractCegarLoop]: Abstraction has 102 states and 139 transitions. [2023-11-19 04:55:19,917 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) [2023-11-19 04:55:19,917 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 139 transitions. [2023-11-19 04:55:19,919 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 161 [2023-11-19 04:55:19,919 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:55:19,920 INFO L195 NwaCegarLoop]: trace histogram [12, 12, 11, 11, 10, 9, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 04:55:19,944 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98024b67-90a2-4b4d-844f-a6458a1fc5d2/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2023-11-19 04:55:20,139 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98024b67-90a2-4b4d-844f-a6458a1fc5d2/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:55:20,140 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 04:55:20,140 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:55:20,140 INFO L85 PathProgramCache]: Analyzing trace with hash -1742693550, now seen corresponding path program 4 times [2023-11-19 04:55:20,140 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:55:20,140 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1684733490] [2023-11-19 04:55:20,140 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:55:20,141 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:55:20,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:55:20,524 INFO L134 CoverageAnalysis]: Checked inductivity of 665 backedges. 40 proven. 236 refuted. 0 times theorem prover too weak. 389 trivial. 0 not checked. [2023-11-19 04:55:20,524 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 04:55:20,524 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1684733490] [2023-11-19 04:55:20,524 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1684733490] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 04:55:20,524 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [818501189] [2023-11-19 04:55:20,525 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-19 04:55:20,525 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:55:20,525 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98024b67-90a2-4b4d-844f-a6458a1fc5d2/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 04:55:20,526 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98024b67-90a2-4b4d-844f-a6458a1fc5d2/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 04:55:20,549 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98024b67-90a2-4b4d-844f-a6458a1fc5d2/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-11-19 04:55:20,646 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:55:20,648 INFO L262 TraceCheckSpWp]: Trace formula consists of 377 conjuncts, 14 conjunts are in the unsatisfiable core [2023-11-19 04:55:20,651 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 04:55:20,742 INFO L134 CoverageAnalysis]: Checked inductivity of 665 backedges. 40 proven. 236 refuted. 0 times theorem prover too weak. 389 trivial. 0 not checked. [2023-11-19 04:55:20,742 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 04:55:22,324 INFO L134 CoverageAnalysis]: Checked inductivity of 665 backedges. 40 proven. 252 refuted. 0 times theorem prover too weak. 373 trivial. 0 not checked. [2023-11-19 04:55:22,325 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [818501189] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 04:55:22,325 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [633556471] [2023-11-19 04:55:22,327 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2023-11-19 04:55:22,328 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 04:55:22,328 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:96) 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:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) 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:337) 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:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) 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) [2023-11-19 04:55:22,329 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 04:55:22,329 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 15] total 18 [2023-11-19 04:55:22,330 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [82236040] [2023-11-19 04:55:22,330 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 04:55:22,331 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2023-11-19 04:55:22,331 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 04:55:22,332 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2023-11-19 04:55:22,332 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2023-11-19 04:55:22,333 INFO L87 Difference]: Start difference. First operand 102 states and 139 transitions. Second operand has 18 states, 16 states have (on average 3.875) internal successors, (62), 18 states have internal predecessors, (62), 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) [2023-11-19 04:55:22,557 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 04:55:22,558 INFO L93 Difference]: Finished difference Result 131 states and 198 transitions. [2023-11-19 04:55:22,558 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2023-11-19 04:55:22,558 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 16 states have (on average 3.875) internal successors, (62), 18 states have internal predecessors, (62), 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 160 [2023-11-19 04:55:22,559 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 04:55:22,561 INFO L225 Difference]: With dead ends: 131 [2023-11-19 04:55:22,561 INFO L226 Difference]: Without dead ends: 117 [2023-11-19 04:55:22,562 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 339 GetRequests, 311 SyntacticMatches, 6 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=112, Invalid=440, Unknown=0, NotChecked=0, Total=552 [2023-11-19 04:55:22,562 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 58 mSDsluCounter, 110 mSDsCounter, 0 mSdLazyCounter, 136 mSolverCounterSat, 51 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 74 SdHoareTripleChecker+Valid, 126 SdHoareTripleChecker+Invalid, 187 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 51 IncrementalHoareTripleChecker+Valid, 136 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 04:55:22,563 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [74 Valid, 126 Invalid, 187 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [51 Valid, 136 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 04:55:22,563 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2023-11-19 04:55:22,574 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 107. [2023-11-19 04:55:22,575 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, (48), 25 states have call predecessors, (48), 20 states have call successors, (48) [2023-11-19 04:55:22,577 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 147 transitions. [2023-11-19 04:55:22,577 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 147 transitions. Word has length 160 [2023-11-19 04:55:22,578 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 04:55:22,578 INFO L495 AbstractCegarLoop]: Abstraction has 107 states and 147 transitions. [2023-11-19 04:55:22,578 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 16 states have (on average 3.875) internal successors, (62), 18 states have internal predecessors, (62), 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) [2023-11-19 04:55:22,578 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 147 transitions. [2023-11-19 04:55:22,583 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 323 [2023-11-19 04:55:22,584 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:55:22,584 INFO L195 NwaCegarLoop]: trace histogram [25, 25, 22, 22, 19, 18, 12, 12, 12, 12, 12, 12, 12, 11, 11, 11, 11, 11, 11, 11, 8, 6, 6, 4, 1, 1, 1, 1, 1, 1] [2023-11-19 04:55:22,609 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98024b67-90a2-4b4d-844f-a6458a1fc5d2/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2023-11-19 04:55:22,800 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98024b67-90a2-4b4d-844f-a6458a1fc5d2/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:55:22,800 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 04:55:22,800 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:55:22,801 INFO L85 PathProgramCache]: Analyzing trace with hash -409206534, now seen corresponding path program 5 times [2023-11-19 04:55:22,801 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:55:22,801 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [666463440] [2023-11-19 04:55:22,801 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:55:22,801 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:55:22,855 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:55:23,354 INFO L134 CoverageAnalysis]: Checked inductivity of 2932 backedges. 103 proven. 665 refuted. 0 times theorem prover too weak. 2164 trivial. 0 not checked. [2023-11-19 04:55:23,354 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 04:55:23,354 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [666463440] [2023-11-19 04:55:23,354 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [666463440] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 04:55:23,355 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2065147025] [2023-11-19 04:55:23,355 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-19 04:55:23,355 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:55:23,355 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98024b67-90a2-4b4d-844f-a6458a1fc5d2/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 04:55:23,356 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98024b67-90a2-4b4d-844f-a6458a1fc5d2/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 04:55:23,383 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98024b67-90a2-4b4d-844f-a6458a1fc5d2/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-11-19 04:55:23,519 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2023-11-19 04:55:23,520 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-19 04:55:23,521 INFO L262 TraceCheckSpWp]: Trace formula consists of 359 conjuncts, 14 conjunts are in the unsatisfiable core [2023-11-19 04:55:23,529 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 04:55:23,672 INFO L134 CoverageAnalysis]: Checked inductivity of 2932 backedges. 666 proven. 96 refuted. 0 times theorem prover too weak. 2170 trivial. 0 not checked. [2023-11-19 04:55:23,673 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 04:55:25,041 INFO L134 CoverageAnalysis]: Checked inductivity of 2932 backedges. 666 proven. 99 refuted. 0 times theorem prover too weak. 2167 trivial. 0 not checked. [2023-11-19 04:55:25,041 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2065147025] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 04:55:25,041 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1577053578] [2023-11-19 04:55:25,043 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2023-11-19 04:55:25,044 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 04:55:25,044 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:96) 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:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) 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:337) 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:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) 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) [2023-11-19 04:55:25,045 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 04:55:25,046 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13, 15] total 25 [2023-11-19 04:55:25,046 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [968973647] [2023-11-19 04:55:25,046 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 04:55:25,047 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2023-11-19 04:55:25,047 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 04:55:25,048 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2023-11-19 04:55:25,049 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=524, Unknown=0, NotChecked=0, Total=600 [2023-11-19 04:55:25,049 INFO L87 Difference]: Start difference. First operand 107 states and 147 transitions. Second operand has 25 states, 24 states have (on average 3.7083333333333335) internal successors, (89), 25 states have internal predecessors, (89), 18 states have call successors, (26), 1 states have call predecessors, (26), 13 states have return successors, (33), 16 states have call predecessors, (33), 18 states have call successors, (33) [2023-11-19 04:55:26,000 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 04:55:26,000 INFO L93 Difference]: Finished difference Result 284 states and 496 transitions. [2023-11-19 04:55:26,001 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2023-11-19 04:55:26,002 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 24 states have (on average 3.7083333333333335) internal successors, (89), 25 states have internal predecessors, (89), 18 states have call successors, (26), 1 states have call predecessors, (26), 13 states have return successors, (33), 16 states have call predecessors, (33), 18 states have call successors, (33) Word has length 322 [2023-11-19 04:55:26,003 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 04:55:26,005 INFO L225 Difference]: With dead ends: 284 [2023-11-19 04:55:26,005 INFO L226 Difference]: Without dead ends: 165 [2023-11-19 04:55:26,008 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 685 GetRequests, 629 SyntacticMatches, 7 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 504 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=435, Invalid=2115, Unknown=0, NotChecked=0, Total=2550 [2023-11-19 04:55:26,010 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 126 mSDsluCounter, 264 mSDsCounter, 0 mSdLazyCounter, 726 mSolverCounterSat, 124 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 127 SdHoareTripleChecker+Valid, 287 SdHoareTripleChecker+Invalid, 850 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 124 IncrementalHoareTripleChecker+Valid, 726 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-11-19 04:55:26,010 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [127 Valid, 287 Invalid, 850 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [124 Valid, 726 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-11-19 04:55:26,011 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 165 states. [2023-11-19 04:55:26,032 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 165 to 145. [2023-11-19 04:55:26,033 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 145 states, 99 states have (on average 1.1717171717171717) internal successors, (116), 98 states have internal predecessors, (116), 28 states have call successors, (28), 18 states have call predecessors, (28), 17 states have return successors, (75), 28 states have call predecessors, (75), 28 states have call successors, (75) [2023-11-19 04:55:26,036 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 145 states to 145 states and 219 transitions. [2023-11-19 04:55:26,037 INFO L78 Accepts]: Start accepts. Automaton has 145 states and 219 transitions. Word has length 322 [2023-11-19 04:55:26,039 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 04:55:26,039 INFO L495 AbstractCegarLoop]: Abstraction has 145 states and 219 transitions. [2023-11-19 04:55:26,039 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 24 states have (on average 3.7083333333333335) internal successors, (89), 25 states have internal predecessors, (89), 18 states have call successors, (26), 1 states have call predecessors, (26), 13 states have return successors, (33), 16 states have call predecessors, (33), 18 states have call successors, (33) [2023-11-19 04:55:26,039 INFO L276 IsEmpty]: Start isEmpty. Operand 145 states and 219 transitions. [2023-11-19 04:55:26,053 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 541 [2023-11-19 04:55:26,054 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:55:26,054 INFO L195 NwaCegarLoop]: trace histogram [42, 42, 37, 37, 33, 30, 21, 21, 21, 21, 21, 21, 21, 18, 18, 18, 18, 18, 18, 18, 12, 12, 12, 4, 1, 1, 1, 1, 1, 1] [2023-11-19 04:55:26,079 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98024b67-90a2-4b4d-844f-a6458a1fc5d2/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2023-11-19 04:55:26,268 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98024b67-90a2-4b4d-844f-a6458a1fc5d2/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:55:26,268 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 04:55:26,268 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:55:26,269 INFO L85 PathProgramCache]: Analyzing trace with hash -1720297932, now seen corresponding path program 6 times [2023-11-19 04:55:26,269 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:55:26,269 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [930443161] [2023-11-19 04:55:26,269 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:55:26,269 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:55:26,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:55:27,119 INFO L134 CoverageAnalysis]: Checked inductivity of 8523 backedges. 230 proven. 966 refuted. 0 times theorem prover too weak. 7327 trivial. 0 not checked. [2023-11-19 04:55:27,119 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 04:55:27,120 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [930443161] [2023-11-19 04:55:27,120 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [930443161] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 04:55:27,120 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1939345177] [2023-11-19 04:55:27,120 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-19 04:55:27,120 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:55:27,121 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98024b67-90a2-4b4d-844f-a6458a1fc5d2/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 04:55:27,122 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98024b67-90a2-4b4d-844f-a6458a1fc5d2/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 04:55:27,140 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98024b67-90a2-4b4d-844f-a6458a1fc5d2/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2023-11-19 04:55:27,367 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-19 04:55:27,367 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-19 04:55:27,372 INFO L262 TraceCheckSpWp]: Trace formula consists of 960 conjuncts, 14 conjunts are in the unsatisfiable core [2023-11-19 04:55:27,382 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 04:55:27,564 INFO L134 CoverageAnalysis]: Checked inductivity of 8523 backedges. 2625 proven. 68 refuted. 0 times theorem prover too weak. 5830 trivial. 0 not checked. [2023-11-19 04:55:27,564 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 04:55:30,101 INFO L134 CoverageAnalysis]: Checked inductivity of 8523 backedges. 267 proven. 1345 refuted. 0 times theorem prover too weak. 6911 trivial. 0 not checked. [2023-11-19 04:55:30,101 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1939345177] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 04:55:30,101 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1708612355] [2023-11-19 04:55:30,104 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2023-11-19 04:55:30,104 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 04:55:30,104 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:96) 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:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) 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:337) 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:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) 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) [2023-11-19 04:55:30,105 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 04:55:30,106 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 13, 15] total 24 [2023-11-19 04:55:30,106 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2132388969] [2023-11-19 04:55:30,106 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 04:55:30,108 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2023-11-19 04:55:30,108 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 04:55:30,109 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2023-11-19 04:55:30,110 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=484, Unknown=0, NotChecked=0, Total=552 [2023-11-19 04:55:30,110 INFO L87 Difference]: Start difference. First operand 145 states and 219 transitions. Second operand has 24 states, 23 states have (on average 4.173913043478261) internal successors, (96), 24 states have internal predecessors, (96), 19 states have call successors, (29), 2 states have call predecessors, (29), 12 states have return successors, (36), 12 states have call predecessors, (36), 19 states have call successors, (36) [2023-11-19 04:55:30,952 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 04:55:30,952 INFO L93 Difference]: Finished difference Result 352 states and 622 transitions. [2023-11-19 04:55:30,953 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2023-11-19 04:55:30,953 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 23 states have (on average 4.173913043478261) internal successors, (96), 24 states have internal predecessors, (96), 19 states have call successors, (29), 2 states have call predecessors, (29), 12 states have return successors, (36), 12 states have call predecessors, (36), 19 states have call successors, (36) Word has length 540 [2023-11-19 04:55:30,954 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 04:55:30,957 INFO L225 Difference]: With dead ends: 352 [2023-11-19 04:55:30,957 INFO L226 Difference]: Without dead ends: 217 [2023-11-19 04:55:30,960 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1117 GetRequests, 1064 SyntacticMatches, 7 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 430 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=359, Invalid=1897, Unknown=0, NotChecked=0, Total=2256 [2023-11-19 04:55:30,961 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 131 mSDsluCounter, 284 mSDsCounter, 0 mSdLazyCounter, 624 mSolverCounterSat, 113 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 132 SdHoareTripleChecker+Valid, 314 SdHoareTripleChecker+Invalid, 737 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 113 IncrementalHoareTripleChecker+Valid, 624 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-11-19 04:55:30,961 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [132 Valid, 314 Invalid, 737 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [113 Valid, 624 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-11-19 04:55:30,962 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 217 states. [2023-11-19 04:55:30,982 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 217 to 164. [2023-11-19 04:55:30,982 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 164 states, 112 states have (on average 1.1339285714285714) internal successors, (127), 111 states have internal predecessors, (127), 31 states have call successors, (31), 20 states have call predecessors, (31), 20 states have return successors, (87), 32 states have call predecessors, (87), 31 states have call successors, (87) [2023-11-19 04:55:30,985 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 164 states to 164 states and 245 transitions. [2023-11-19 04:55:30,985 INFO L78 Accepts]: Start accepts. Automaton has 164 states and 245 transitions. Word has length 540 [2023-11-19 04:55:30,986 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 04:55:30,986 INFO L495 AbstractCegarLoop]: Abstraction has 164 states and 245 transitions. [2023-11-19 04:55:30,987 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 23 states have (on average 4.173913043478261) internal successors, (96), 24 states have internal predecessors, (96), 19 states have call successors, (29), 2 states have call predecessors, (29), 12 states have return successors, (36), 12 states have call predecessors, (36), 19 states have call successors, (36) [2023-11-19 04:55:30,987 INFO L276 IsEmpty]: Start isEmpty. Operand 164 states and 245 transitions. [2023-11-19 04:55:31,000 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 515 [2023-11-19 04:55:31,001 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:55:31,001 INFO L195 NwaCegarLoop]: trace histogram [39, 39, 36, 36, 32, 29, 19, 19, 19, 19, 19, 19, 19, 18, 18, 18, 18, 18, 18, 18, 14, 10, 7, 7, 1, 1, 1, 1, 1, 1] [2023-11-19 04:55:31,028 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98024b67-90a2-4b4d-844f-a6458a1fc5d2/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2023-11-19 04:55:31,224 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98024b67-90a2-4b4d-844f-a6458a1fc5d2/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:55:31,225 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 04:55:31,225 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:55:31,225 INFO L85 PathProgramCache]: Analyzing trace with hash 64995566, now seen corresponding path program 7 times [2023-11-19 04:55:31,225 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:55:31,226 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [128599978] [2023-11-19 04:55:31,226 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:55:31,226 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:55:31,329 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:55:32,092 INFO L134 CoverageAnalysis]: Checked inductivity of 7682 backedges. 312 proven. 814 refuted. 0 times theorem prover too weak. 6556 trivial. 0 not checked. [2023-11-19 04:55:32,093 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 04:55:32,093 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [128599978] [2023-11-19 04:55:32,093 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [128599978] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 04:55:32,093 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [263259618] [2023-11-19 04:55:32,093 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-19 04:55:32,094 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:55:32,094 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98024b67-90a2-4b4d-844f-a6458a1fc5d2/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 04:55:32,095 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98024b67-90a2-4b4d-844f-a6458a1fc5d2/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 04:55:32,115 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98024b67-90a2-4b4d-844f-a6458a1fc5d2/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2023-11-19 04:55:32,415 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:55:32,419 INFO L262 TraceCheckSpWp]: Trace formula consists of 1163 conjuncts, 18 conjunts are in the unsatisfiable core [2023-11-19 04:55:32,434 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 04:55:32,578 INFO L134 CoverageAnalysis]: Checked inductivity of 7682 backedges. 201 proven. 1282 refuted. 0 times theorem prover too weak. 6199 trivial. 0 not checked. [2023-11-19 04:55:32,578 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 04:55:35,971 INFO L134 CoverageAnalysis]: Checked inductivity of 7682 backedges. 201 proven. 1315 refuted. 0 times theorem prover too weak. 6166 trivial. 0 not checked. [2023-11-19 04:55:35,971 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [263259618] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 04:55:35,972 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [560741453] [2023-11-19 04:55:35,980 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2023-11-19 04:55:35,980 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 04:55:35,981 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:96) 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:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) 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:337) 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:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) 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) [2023-11-19 04:55:35,982 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 04:55:35,983 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 13, 19] total 25 [2023-11-19 04:55:35,983 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1180451447] [2023-11-19 04:55:35,983 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 04:55:35,985 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2023-11-19 04:55:35,985 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 04:55:35,987 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2023-11-19 04:55:35,987 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=495, Unknown=0, NotChecked=0, Total=600 [2023-11-19 04:55:35,988 INFO L87 Difference]: Start difference. First operand 164 states and 245 transitions. Second operand has 25 states, 23 states have (on average 3.608695652173913) internal successors, (83), 25 states have internal predecessors, (83), 21 states have call successors, (25), 1 states have call predecessors, (25), 12 states have return successors, (34), 13 states have call predecessors, (34), 21 states have call successors, (34) [2023-11-19 04:55:36,327 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 04:55:36,327 INFO L93 Difference]: Finished difference Result 241 states and 457 transitions. [2023-11-19 04:55:36,328 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2023-11-19 04:55:36,328 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 23 states have (on average 3.608695652173913) internal successors, (83), 25 states have internal predecessors, (83), 21 states have call successors, (25), 1 states have call predecessors, (25), 12 states have return successors, (34), 13 states have call predecessors, (34), 21 states have call successors, (34) Word has length 514 [2023-11-19 04:55:36,330 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 04:55:36,333 INFO L225 Difference]: With dead ends: 241 [2023-11-19 04:55:36,333 INFO L226 Difference]: Without dead ends: 217 [2023-11-19 04:55:36,335 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1052 GetRequests, 1010 SyntacticMatches, 8 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 352 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=243, Invalid=1017, Unknown=0, NotChecked=0, Total=1260 [2023-11-19 04:55:36,335 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 61 mSDsluCounter, 221 mSDsCounter, 0 mSdLazyCounter, 257 mSolverCounterSat, 60 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 76 SdHoareTripleChecker+Valid, 240 SdHoareTripleChecker+Invalid, 317 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 60 IncrementalHoareTripleChecker+Valid, 257 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-19 04:55:36,336 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [76 Valid, 240 Invalid, 317 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [60 Valid, 257 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-19 04:55:36,337 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 217 states. [2023-11-19 04:55:36,359 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 217 to 191. [2023-11-19 04:55:36,360 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 191 states, 128 states have (on average 1.1171875) internal successors, (143), 127 states have internal predecessors, (143), 37 states have call successors, (37), 20 states have call predecessors, (37), 25 states have return successors, (121), 43 states have call predecessors, (121), 37 states have call successors, (121) [2023-11-19 04:55:36,363 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 191 states to 191 states and 301 transitions. [2023-11-19 04:55:36,363 INFO L78 Accepts]: Start accepts. Automaton has 191 states and 301 transitions. Word has length 514 [2023-11-19 04:55:36,364 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 04:55:36,364 INFO L495 AbstractCegarLoop]: Abstraction has 191 states and 301 transitions. [2023-11-19 04:55:36,364 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 23 states have (on average 3.608695652173913) internal successors, (83), 25 states have internal predecessors, (83), 21 states have call successors, (25), 1 states have call predecessors, (25), 12 states have return successors, (34), 13 states have call predecessors, (34), 21 states have call successors, (34) [2023-11-19 04:55:36,365 INFO L276 IsEmpty]: Start isEmpty. Operand 191 states and 301 transitions. [2023-11-19 04:55:36,382 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1401 [2023-11-19 04:55:36,383 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:55:36,383 INFO L195 NwaCegarLoop]: trace histogram [107, 107, 98, 98, 84, 83, 53, 53, 53, 53, 53, 53, 53, 49, 49, 49, 49, 49, 49, 49, 35, 30, 23, 15, 1, 1, 1, 1, 1, 1] [2023-11-19 04:55:36,413 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98024b67-90a2-4b4d-844f-a6458a1fc5d2/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2023-11-19 04:55:36,608 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98024b67-90a2-4b4d-844f-a6458a1fc5d2/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2023-11-19 04:55:36,608 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 04:55:36,608 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:55:36,609 INFO L85 PathProgramCache]: Analyzing trace with hash -214626957, now seen corresponding path program 8 times [2023-11-19 04:55:36,609 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:55:36,609 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [79829115] [2023-11-19 04:55:36,609 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:55:36,609 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:55:36,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:55:40,018 INFO L134 CoverageAnalysis]: Checked inductivity of 58801 backedges. 506 proven. 3333 refuted. 0 times theorem prover too weak. 54962 trivial. 0 not checked. [2023-11-19 04:55:40,019 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 04:55:40,019 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [79829115] [2023-11-19 04:55:40,019 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [79829115] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 04:55:40,019 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1435612879] [2023-11-19 04:55:40,020 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-19 04:55:40,020 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:55:40,020 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98024b67-90a2-4b4d-844f-a6458a1fc5d2/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 04:55:40,033 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98024b67-90a2-4b4d-844f-a6458a1fc5d2/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 04:55:40,086 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98024b67-90a2-4b4d-844f-a6458a1fc5d2/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2023-11-19 04:55:40,384 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2023-11-19 04:55:40,384 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-19 04:55:40,387 INFO L262 TraceCheckSpWp]: Trace formula consists of 315 conjuncts, 14 conjunts are in the unsatisfiable core [2023-11-19 04:55:40,409 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 04:55:40,613 INFO L134 CoverageAnalysis]: Checked inductivity of 58801 backedges. 7000 proven. 61 refuted. 0 times theorem prover too weak. 51740 trivial. 0 not checked. [2023-11-19 04:55:40,613 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 04:55:45,243 INFO L134 CoverageAnalysis]: Checked inductivity of 58801 backedges. 4315 proven. 145 refuted. 0 times theorem prover too weak. 54341 trivial. 0 not checked. [2023-11-19 04:55:45,243 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1435612879] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 04:55:45,243 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1739287786] [2023-11-19 04:55:45,246 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2023-11-19 04:55:45,246 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 04:55:45,247 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:96) 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:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) 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:337) 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:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) 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) [2023-11-19 04:55:45,248 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 04:55:45,249 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13, 15] total 27 [2023-11-19 04:55:45,249 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [500182648] [2023-11-19 04:55:45,249 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 04:55:45,252 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2023-11-19 04:55:45,253 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 04:55:45,254 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2023-11-19 04:55:45,254 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=88, Invalid=614, Unknown=0, NotChecked=0, Total=702 [2023-11-19 04:55:45,255 INFO L87 Difference]: Start difference. First operand 191 states and 301 transitions. Second operand has 27 states, 26 states have (on average 3.9615384615384617) internal successors, (103), 27 states have internal predecessors, (103), 21 states have call successors, (30), 2 states have call predecessors, (30), 15 states have return successors, (40), 14 states have call predecessors, (40), 21 states have call successors, (40) [2023-11-19 04:55:46,178 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 04:55:46,178 INFO L93 Difference]: Finished difference Result 482 states and 951 transitions. [2023-11-19 04:55:46,179 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2023-11-19 04:55:46,179 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 26 states have (on average 3.9615384615384617) internal successors, (103), 27 states have internal predecessors, (103), 21 states have call successors, (30), 2 states have call predecessors, (30), 15 states have return successors, (40), 14 states have call predecessors, (40), 21 states have call successors, (40) Word has length 1400 [2023-11-19 04:55:46,180 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 04:55:46,184 INFO L225 Difference]: With dead ends: 482 [2023-11-19 04:55:46,185 INFO L226 Difference]: Without dead ends: 281 [2023-11-19 04:55:46,189 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2841 GetRequests, 2783 SyntacticMatches, 7 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 628 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=468, Invalid=2288, Unknown=0, NotChecked=0, Total=2756 [2023-11-19 04:55:46,189 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 153 mSDsluCounter, 292 mSDsCounter, 0 mSdLazyCounter, 625 mSolverCounterSat, 149 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 154 SdHoareTripleChecker+Valid, 317 SdHoareTripleChecker+Invalid, 774 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 149 IncrementalHoareTripleChecker+Valid, 625 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-11-19 04:55:46,190 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [154 Valid, 317 Invalid, 774 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [149 Valid, 625 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-11-19 04:55:46,191 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 281 states. [2023-11-19 04:55:46,217 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 281 to 224. [2023-11-19 04:55:46,217 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 224 states, 152 states have (on average 1.138157894736842) internal successors, (173), 150 states have internal predecessors, (173), 43 states have call successors, (43), 26 states have call predecessors, (43), 28 states have return successors, (171), 47 states have call predecessors, (171), 43 states have call successors, (171) [2023-11-19 04:55:46,221 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 224 states to 224 states and 387 transitions. [2023-11-19 04:55:46,222 INFO L78 Accepts]: Start accepts. Automaton has 224 states and 387 transitions. Word has length 1400 [2023-11-19 04:55:46,223 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 04:55:46,223 INFO L495 AbstractCegarLoop]: Abstraction has 224 states and 387 transitions. [2023-11-19 04:55:46,223 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 26 states have (on average 3.9615384615384617) internal successors, (103), 27 states have internal predecessors, (103), 21 states have call successors, (30), 2 states have call predecessors, (30), 15 states have return successors, (40), 14 states have call predecessors, (40), 21 states have call successors, (40) [2023-11-19 04:55:46,223 INFO L276 IsEmpty]: Start isEmpty. Operand 224 states and 387 transitions. [2023-11-19 04:55:46,234 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 950 [2023-11-19 04:55:46,235 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:55:46,235 INFO L195 NwaCegarLoop]: trace histogram [71, 71, 68, 68, 58, 54, 35, 35, 35, 35, 35, 35, 35, 34, 34, 34, 34, 34, 34, 34, 23, 20, 17, 10, 1, 1, 1, 1, 1, 1] [2023-11-19 04:55:46,257 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98024b67-90a2-4b4d-844f-a6458a1fc5d2/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2023-11-19 04:55:46,452 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98024b67-90a2-4b4d-844f-a6458a1fc5d2/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2023-11-19 04:55:46,452 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 04:55:46,452 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:55:46,453 INFO L85 PathProgramCache]: Analyzing trace with hash 867464188, now seen corresponding path program 9 times [2023-11-19 04:55:46,453 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:55:46,453 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1307008712] [2023-11-19 04:55:46,453 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:55:46,453 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:55:46,662 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:55:48,107 INFO L134 CoverageAnalysis]: Checked inductivity of 26760 backedges. 504 proven. 2042 refuted. 0 times theorem prover too weak. 24214 trivial. 0 not checked. [2023-11-19 04:55:48,107 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 04:55:48,107 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1307008712] [2023-11-19 04:55:48,108 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1307008712] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 04:55:48,108 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [327864474] [2023-11-19 04:55:48,108 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-19 04:55:48,108 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:55:48,108 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98024b67-90a2-4b4d-844f-a6458a1fc5d2/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 04:55:48,112 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98024b67-90a2-4b4d-844f-a6458a1fc5d2/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 04:55:48,128 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98024b67-90a2-4b4d-844f-a6458a1fc5d2/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2023-11-19 04:55:48,521 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-19 04:55:48,521 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-19 04:55:48,527 INFO L262 TraceCheckSpWp]: Trace formula consists of 1688 conjuncts, 18 conjunts are in the unsatisfiable core [2023-11-19 04:55:48,542 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 04:55:48,792 INFO L134 CoverageAnalysis]: Checked inductivity of 26760 backedges. 7428 proven. 176 refuted. 0 times theorem prover too weak. 19156 trivial. 0 not checked. [2023-11-19 04:55:48,792 INFO L327 TraceCheckSpWp]: Computing backward predicates...